U.S. patent application number 15/299203 was filed with the patent office on 2017-05-04 for polymorphic forms of 3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
The applicant listed for this patent is Celgene Corporation. Invention is credited to Roger Shen-Chu Chen, Markian S. Jaworsky, George W. Muller.
Application Number | 20170121304 15/299203 |
Document ID | / |
Family ID | 34272860 |
Filed Date | 2017-05-04 |
United States Patent
Application |
20170121304 |
Kind Code |
A1 |
Jaworsky; Markian S. ; et
al. |
May 4, 2017 |
POLYMORPHIC FORMS OF 3-(4-AMINO-1-OXO-1,3
DIHYDRO-ISOINDOL-2-YL)-PIPERIDINE-2,6-DIONE
Abstract
Polymorphic forms of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione are disclosed.
Compositions comprising the polymorphic forms, methods of making
the polymorphic forms and methods of their use are also
disclosed.
Inventors: |
Jaworsky; Markian S.;
(Hopewell, NJ) ; Chen; Roger Shen-Chu; (Edison,
NJ) ; Muller; George W.; (Rancho Santa Fe,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Celgene Corporation |
Summit |
NJ |
US |
|
|
Family ID: |
34272860 |
Appl. No.: |
15/299203 |
Filed: |
October 20, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14827210 |
Aug 14, 2015 |
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15299203 |
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12353383 |
Jan 14, 2009 |
9365538 |
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14827210 |
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12220336 |
Jul 23, 2008 |
7977357 |
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12353383 |
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10934863 |
Sep 3, 2004 |
7465800 |
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12220336 |
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60499723 |
Sep 4, 2003 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61P 37/00 20180101;
A61P 35/02 20180101; A61P 27/02 20180101; A61P 29/00 20180101; A61P
25/04 20180101; A61P 37/06 20180101; A61P 35/00 20180101; A61P 7/00
20180101; B65D 51/2864 20130101; C07B 2200/13 20130101; A61P 37/02
20180101; A61P 9/00 20180101; C07D 401/04 20130101 |
International
Class: |
C07D 401/04 20060101
C07D401/04 |
Claims
1.-28. (canceled)
29. A composition comprising amorphous
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
and crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate.
30. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has an X-ray powder diffraction pattern comprising
peaks at approximately 16, 22, and 27 degrees 2.theta..
31. The composition of claim 30, wherein the crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate has an X-ray powder diffraction pattern further
comprising a peak at approximately 18 degrees 2.theta..
32. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has an X-ray powder diffraction pattern comprising
peaks at approximately 15.8, 22.2, and 26.7 degrees 2.theta..
33. The composition of claim 32, wherein the crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate has an X-ray powder diffraction pattern further
comprising a peak at approximately 18.2 degrees 2.theta..
34. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that corresponds to the representative X-ray powder
diffraction pattern provided in FIG. 6.
35. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that corresponds to the representative X-ray powder
diffraction pattern provided in FIG. 32.
36. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that corresponds to the representative X-ray powder
diffraction pattern provided in FIG. 33.
37. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that corresponds to the representative X-ray powder
diffraction pattern provided in FIG. 34.
38. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has a differential scanning calorimetry thermogram
comprising an endotherm with a maximum at about 268.degree. C.
39. The composition of claim 38, wherein the thermogram further
comprises an endotherm corresponding to dehydration.
40. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has a differential scanning calorimetry thermogram
corresponding to the representative differential scanning
calorimetry thermogram provided in FIG. 9.
41. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has a differential scanning calorimetry thermogram
corresponding to the representative differential scanning
calorimetry thermogram provided in FIG. 42.
42. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has a differential scanning calorimetry thermogram
corresponding to the representative differential scanning
calorimetry thermogram provided in FIG. 43.
43. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has a differential scanning calorimetry thermogram
corresponding to the representative differential scanning
calorimetry thermogram provided in FIG. 44.
44. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has between approximately 0.46 and approximately
0.59 moles of water per mole of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione.
45. The composition of claim 29, comprising crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate that has a thermal gravimetric analysis curve
comprising a weight loss of between about 3.1% and about 4.0% when
heated from about 30.degree. C. to about 175.degree. C.
46. The composition of claim 29, wherein the composition comprises:
a) less than 50% by weight of amorphous
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione;
and b) greater than 50% by weight of crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate.
47. The composition of claim 29, wherein the composition comprises:
a) less than 25% by weight of amorphous
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione;
and b) greater than 75% by weight of crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate.
48. The composition of claim 29, wherein the composition comprises:
a) less than 10% by weight of amorphous
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione;
and b) greater than 90% by weight of crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate.
49. The composition of claim 29, wherein the composition comprises:
a) less than 5% by weight of amorphous
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione;
and b) greater than 95% by weight of crystalline
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
hemihydrate.
Description
[0001] This application claims the benefit of U.S. provisional
application 60/499,723, filed Sep. 4, 2003, the contents of which
are incorporated by reference herein their entirety.
1. FIELD OF THE INVENTION
[0002] This invention relates to polymorphic forms of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione,
compositions comprising the polymorphic forms, methods of making
the polymorphic forms and methods of their use for the treatment of
diseases and conditions including, but not limited to, inflammatory
diseases, autoimmune diseases, and cancer.
2. BACKGROUND OF THE INVENTION
[0003] Many compounds can exist in different crystal forms, or
polymorphs, which exhibit different physical, chemical, and
spectroscopic properties. For example, certain polymorphs of a
compound may be more readily soluble in particular solvents, may
flow more readily, or may compress more easily than others. See,
e.g., P. DiMartino, et al., J. Thermal Anal., 48:447-458 (1997). In
the case of drugs, certain solid forms may be more bioavailable
than others, while others may be more stable under certain
manufacturing, storage, and biological conditions. This is
particularly important from a regulatory standpoint, since drugs
are approved by agencies such as the U.S. Food and Drug
Administration only if they meet exacting purity and
characterization standards. Indeed, the regulatory approval of one
polymorph of a compound, which exhibits certain solubility and
physico-chemical (including spectroscopic) properties, typically
does not imply the ready approval of other polymorphs of that same
compound.
[0004] Polymorphic forms of a compound are known in the
pharmaceutical arts to affect, for example, the solubility,
stability, flowability, fractability, and compressibility of the
compound, as well as the safety and efficacy of drug products
comprising it. See, e.g., Knapman, K. Modern Drug Discoveries,
2000, 53. Therefore, the discovery of new polymorphs of a drug can
provide a variety of advantages.
[0005] U.S. Pat. Nos. 5,635,517 and 6,281,230, both to Muller et
al., disclose 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione, which is useful in
treating and preventing a wide range of diseases and conditions
including, but not limited to, inflammatory diseases, autoimmune
diseases, and cancer. New polymorphic forms of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione can further the
development of formulations for the treatment of these chronic
illnesses, and may yield numerous formulation, manufacturing and
therapeutic benefits.
3. SUMMARY OF THE INVENTION
[0006] This invention encompasses polymorphs of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
In certain aspects, the invention provides polymorphs of the
compound identified herein as forms A, B, C, D, E, F, G, and H. The
invention also encompasses mixtures of these forms. In further
embodiments, this invention provides methods of making, isolating
and characterizing the polymorphs.
[0007] This invention also provides pharmaceutical compositions and
single unit dosage forms comprising a polymorph of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
The invention further provides methods for the treatment or
prevention of a variety of diseases and disorders, which comprise
administering to a patient in need of such treatment or prevention
a therapeutically effective amount of a polymorph of
3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione.
4. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Specific aspects of the invention can be understood with
reference to the attached figures:
[0009] FIG. 1 provides a representative X-ray powder diffraction
(XRPD) pattern of Form A;
[0010] FIG. 2 provides a representative IR spectrum of Form A;
[0011] FIG. 3 provides a representative Raman spectrum of Form
A;
[0012] FIG. 4 provides a representative thermogravimetric analysis
(TGA) curve and a representative differential scanning calorimeter
(DSC) thermogram of Form A;
[0013] FIG. 5 provides a representative moisture
sorption/desorption isotherm of Form A;
[0014] FIG. 6 provides a representative XRPD pattern of Form B;
[0015] FIG. 7 provides a representative IR spectrum of Form B;
[0016] FIG. 8 provides a representative Raman spectrum of Form
B;
[0017] FIG. 9 provides a representative TGA curve and a
representative DSC thermogram of Form B;
[0018] FIG. 10 provides representative TG-IR results of Form B;
[0019] FIG. 11 provides a representative moisture
sorption/desorption isotherm of Form B;
[0020] FIG. 12 provides a representative XRPD pattern of Form
C;
[0021] FIG. 13 provides a representative IR spectrum of Form C;
[0022] FIG. 14 provides a representative Raman spectrum of Form
C;
[0023] FIG. 15 provides a representative TGA curve and a
representative DSC thermogram of Form C;
[0024] FIG. 16 provides representative TG-IR results of Form C;
[0025] FIG. 17 provides a representative moisture
sorption/desorption isotherm of Form C;
[0026] FIG. 18 provides a representative XRPD pattern of Form
D;
[0027] FIG. 19 provides a representative IR spectrum of Form D;
[0028] FIG. 20 provides a representative Raman spectrum of Form
D;
[0029] FIG. 21 provides a representative TGA curve and a
representative DSC thermogram of Form D;
[0030] FIG. 22 provides a representative moisture
sorption/desorption isotherm of Form D;
[0031] FIG. 23 provides a representative XRPD pattern of Form
E;
[0032] FIG. 24 provides a representative TGA curve and a
representative DSC thermogram of Form E;
[0033] FIG. 25 provides a representative moisture
sorption/desorption isotherm of Form E;
[0034] FIG. 26 provides a representative XRPD pattern for a sample
of Form F;
[0035] FIG. 27 provides a representative thermogram of Form F;
[0036] FIG. 28 provides a representative XRPD pattern of Form
G;
[0037] FIG. 29 provides a representative DSC thermogram for a
sample of Form G;
[0038] FIG. 30 provides a representative XRPD pattern of Form
H;
[0039] FIG. 31 provides a representative TGA curve and a
representative DSC thermogram of Form H;
[0040] FIG. 32 provides a representative XRPD pattern of Form
B;
[0041] FIG. 33 provides a representative XRPD pattern of Form
B;
[0042] FIG. 34 provides a representative XRPD pattern of Form
B;
[0043] FIG. 35 provides a representative XRPD pattern of Form
E;
[0044] FIG. 36 provides a representative XRPD pattern of polymorph
mixture;
[0045] FIG. 37 provides a representative TGA curve of Form B;
[0046] FIG. 38 provides a representative TGA curve of Form B;
[0047] FIG. 39 provides a representative TGA curve of Form B;
[0048] FIG. 40 provides a representative TGA curve of Form E;
[0049] FIG. 41 provides a representative TGA curve of polymorph
mixture;
[0050] FIG. 42 provides a representative DSC thermogram of Form
B;
[0051] FIG. 43 provides a representative DSC thermogram of Form
B;
[0052] FIG. 44 provides a representative DSC thermogram of Form
B;
[0053] FIG. 45 provides a representative DSC thermogram of Form
E;
[0054] FIG. 46 provides a representative DSC thermogram of
polymorph mixture;
[0055] FIG. 47 provides a UV-Vis scan of dissolution medium;
[0056] FIG. 48 provides a UV-Vis scan of 0.04 mg/ml of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione in
dissolution medium;
[0057] FIG. 49 provides a UV-Vis scan of 0.008 mg/ml of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione in
dissolution medium;
[0058] FIG. 50 provides a calibration curve for
3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione;
[0059] FIG. 51 provides a solubility curve of Form A;
[0060] FIG. 52 provides a solubility curve of Form B;
[0061] FIG. 53 provides an intrinsic dissolution of Forms A, B and
E; and
[0062] FIG. 54 provides an intrinsic dissolution of Forms A, B and
E.
5. DETAILED DESCRIPTION OF THE INVENTION
5.1 Definitions
[0063] As used herein and unless otherwise indicated, the terms
"treat," "treating" and "treatment" refer to the alleviation of a
disease or disorder and/or at least one of its attendant
symptoms.
[0064] As used herein and unless otherwise indicated, the terms
"prevent," "preventing" and "prevention" refer to the inhibition of
a symptom of a disease or disorder or the disease itself.
[0065] As used herein and unless otherwise indicated, the terms
"polymorph" and "polymorphic form" refer to solid crystalline forms
of a compound or complex. Different polymorphs of the same compound
can exhibit different physical, chemical and/or spectroscopic
properties. Different physical properties include, but are not
limited to stability (e.g., to heat or light), compressibility and
density (important in formulation and product manufacturing), and
dissolution rates (which can affect bioavailability). Differences
in stability can result from changes in chemical reactivity (e.g.,
differential oxidation, such that a dosage form discolors more
rapidly when comprised of one polymorph than when comprised of
another polymorph) or mechanical characteristics (e.g., tablets
crumble on storage as a kinetically favored polymorph converts to
thermodynamically more stable polymorph) or both (e.g., tablets of
one polymorph are more susceptible to breakdown at high humidity).
Different physical properties of polymorphs can affect their
processing. For example, one polymorph might be more likely to form
solvates or might be more difficult to filter or wash free of
impurities than another due to, for example, the shape or size
distribution of particles of it.
[0066] Polymorphs of a molecule can be obtained by a number of
methods known in the art. Such methods include, but are not limited
to, melt recrystallization, melt cooling, solvent
recrystallization, desolvation, rapid evaporation, rapid cooling,
slow cooling, vapor diffusion and sublimation. Polymorphs can be
detected, identified, classified and characterized using well-known
techniques such as, but not limited to, differential scanning
calorimetry (DSC), thermogravimetry (TGA), X-ray powder
diffractometry (XRPD), single crystal X-ray diffractometry,
vibrational spectroscopy, solution calorimetry, solid state nuclear
magnetic resonance (NMR), infrared (IR) spectroscopy, Raman
spectroscopy, hot stage optical microscopy, scanning electron
microscopy (SEM), electron crystallography and quantitative
analysis, particle size analysis (PSA), surface area analysis,
solubility, and rate of dissolution.
[0067] As used herein to refer to the spectra or data presented in
graphical form (e.g., XRPD, IR, Raman and NMR spectra), and unless
otherwise indicated, the term "peak" refers to a peak or other
special feature that one skilled in the art would recognize as not
attributable to background noise. The term "significant peaks"
refers to peaks at least the median size (e.g., height) of other
peaks in the spectrum or data, or at least 1.5, 2, or 2.5 times the
median size of other peaks in the spectrum or data.
[0068] As used herein and unless otherwise indicated, the term
"substantially pure" when used to describe a polymorph of a
compound means a solid form of the compound that comprises that
polymorph and is substantially free of other polymorphs of the
compound. A representative substantially pure polymorph comprises
greater than about 80% by weight of one polymorphic form of the
compound and less than about 20% by weight of other polymorphic
forms of the compound, more preferably greater than about 90% by
weight of one polymorphic form of the compound and less than about
10% by weight of the other polymorphic forms of the compound, even
more preferably greater than about 95% by weight of one polymorphic
form of the compound and less than about 5% by weight of the other
polymorphic forms of the compound, and most preferably greater than
about 97% by weight of one polymorphic forms of the compound and
less than about 3% by weight of the other polymorphic forms of the
compound.
5.2 Polymorphic Forms
[0069] This invention is directed to polymorphic forms of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione,
which has the structure shown below:
##STR00001##
[0070] This compound can be prepared according to the methods
described in U.S. Pat. Nos. 6,281,230 and 5,635,517, the entireties
of which are incorporated herein by reference. For example, the
compound can be prepared through catalytic hydrogenation of
3-(4-nitro-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
3-(4-Nitro-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione
can be obtained by allowing 2,6-dioxopiperidin-3-ammonium chloride
to react with methyl 2-bromomethyl-4-nitrobenzoate in
dimethylformamide in the presence of triethylamine. The methyl
2-bromomethyl-4-nitrobenzoate in turn is obtained from the
corresponding methyl ester of nitro-ortho-toluic acid by
conventional bromination with N-bromosuccinimide under the
influence of light.
[0071] Polymorphs of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione can be obtained by
techniques known in the art, including solvent recrystallization,
desolvation, vapor diffusion, rapid evaporation, slow evaporation,
rapid cooling and slow cooling. Polymorphs can be made by
dissolving a weighed quantity of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione in various solvents at
elevated temperatures. The solutions of the compound can then be
filtered and allowed to evaporate either in an open vial (for fast
hot evaporation) or in a vial covered with aluminum foil containing
pinholes (hot slow evaporation). Polymorphs can also be obtained
from slurries. Polymorphs can be crystallized from solutions or
slurries using several methods. For example, a solution created at
an elevated temperature (e.g., 60.degree. C.) can be filtered
quickly then allowed to cool to room temperature. Once at room
temperature, the sample that did not crystallize can be moved to a
refrigerator then filtered. Alternatively, the solutions can be
crash cooled by dissolving the solid in a solvent at an increased
temperature (e.g., 45-65.degree. C.) followed by cooling in a dry
ice/solvent bath.
[0072] One embodiment of the invention encompasses Form A of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
Form A is an unsolvated, crystalline material that can be obtained
from non-aqueous solvent systems. Another embodiment of the
invention encompasses Form B of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form B is a
hemihydrated, crystalline material that can be obtained from
various solvent systems. Another embodiment of the invention
encompasses Form C of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form C is a
hemisolvated crystalline material that can be obtained from
solvents such as, but not limited to, acetone. Another embodiment
of the invention encompasses Form D of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form D is a
crystalline, solvated polymorph prepared from a mixture of
acetonitrile and water. Another embodiment of the invention
encompasses Form E of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form E is a
dihydrated, crystalline material. Another embodiment of the
invention encompasses Form F of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form F is an
unsolvated, crystalline material that can be obtained from the
dehydration of Form E. Another embodiment of the invention
encompasses Form G of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form G is an
unsolvated, crystalline material that can be obtained from
slurrying forms B and E in a solvent such as, but not limited to,
tetrahydrofuran (THF). Another embodiment of the invention
encompasses Form H of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Form H is a partially
hydrated crystalline material that can be obtained by exposing Form
E to 0% relative humidity. Each of these forms is discussed in
detail below.
[0073] Another embodiment of the invention encompasses a
composition comprising amorphous 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione and crystalline
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione of
form A, B, C, D, E, F, G or H. Specific compositions can comprise
greater than about 50, 75, 90 or 95 weight percent crystalline
3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione.
[0074] Another embodiment of the invention encompasses a
composition comprising at least two crystalline forms of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione
(e.g., a mixture of polymorph forms B and E).
[0075] 5.2.1 Form A
[0076] The data described herein for Form A, as well as for Forms
B-H, were obtained using the experimental methods described in
Examples 6.3-6.7, provided below.
[0077] Form A can be obtained from various solvents, including, but
not limited to 1-butanol, butyl acetate, ethanol, ethyl acetate,
methanol, methyl ethyl ketone, and THF. FIG. 1 shows a
representative XRPD pattern of Form A. The pattern is characterized
by peaks, preferably significant peaks, at approximately 8, 14.5,
16, 17.5, 20.5, 24, and 26 degrees 2.theta.. Representative IR and
Raman spectra data are provided in FIGS. 2 and 3.
[0078] Representative thermal characteristics of Form A are shown
in FIG. 4. TGA data show a small weight increase up to about
150.degree. C., indicating an unsolvated material. Weight loss
above 150.degree. C. is attributed to decomposition. The DSC curve
of Form A exhibits an endotherm at about 270.degree. C.
[0079] Representative moisture sorption and desorption data are
plotted in FIG. 5. Form A does not exhibit a significant weight
gain from 5 to 95% relative humidity. Equilibrium can be obtained
at each relative humidity step. As the form dries from 95% back
down to 5% relative humidity, it tends to maintain its weight such
that at 5% relative humidity it has typically lost only about
0.003% by weight from start to finish. Form A is capable of
remaining a crystalline solid for about 11 days when stored at
about 22, 45, 58, and 84% relative humidity.
[0080] Interconversion studies show that Form A can convert to Form
B in aqueous solvent systems and can convert to Form C in acetone
solvent systems. Form A tends to be stable in anhydrous solvent
systems. In water systems and in the presence of Form E, Form A
tends to convert to Form E.
[0081] When stored for a period of about 85 days under two
different temperature/relative humidity stress conditions (room
temperature/0% relative humidity (RH) and 40.degree. C./93% RH),
Form A typically does not convert to a different form.
[0082] In sum, Form A is a crystalline, unsolvated solid that melts
at approximately 270.degree. C. Form A is weakly or not hygroscopic
and appears to be the most thermodynamically stable anhydrous
polymorph of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione discovered thus
far.
[0083] 5.2.2 Form B
[0084] Form B can be obtained from many solvents, including, but
not limited to, hexane, toluene, and water. FIG. 6 shows a
representative XRPD pattern of Form B, characterized by peaks at
approximately 16, 18, 22 and 27 degrees 2.theta..
[0085] Solution proton NMR confirm that Form B is a form of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
Representative IR and Raman spectra are shown in FIGS. 7 and 8,
respectively. Compared to Form A, the IR spectrum for Form B has
peaks at approximately 3513 and 1960 cm.sup.-1.
[0086] Representative DSC and TGA data for Form B are shown in FIG.
9. The DSC curve exhibits endotherms at about 146 and 268.degree.
C. These events are identified as dehydration and melting by hot
stage microscopy experiments. Form B typically loses about 3.1%
volatiles up to about 175.degree. C. (per approximately 0.46 moles
of water). Comparison of the IR spectrum of the volatiles with that
of water indicates that they are water (See FIG. 10). Calculations
from TGA data indicate that Form B is a hemihydrate. Karl Fischer
water analysis also supports this conclusion.
[0087] Representative moisture sorption and desorption data are
shown in FIG. 11. Form B typically does not exhibit a significant
weight gain from 5% to 95% relative humidity, when equilibrium is
obtained at each relative humidity step. As Form B dries from 95%
back down to 5% relative humidity, it tends to maintain its weight
such that at 5% relative humidity it typically has gained only
about 0.022% by weight (about 0.003 mg) from start to finish. Form
B does not convert to a different form upon exposure to about 84%
relative humidity for about ten days.
[0088] Interconversion studies show that Form B typically converts
to Form A in a THF solvent system, and typically converts to Form C
in an acetone solvent system. In aqueous solvent systems such as
pure water and 10% water solutions, Form B is the most stable of
the polymorphic forms of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. However, it can
convert to Form E in the presence of water. Desolvation experiments
show that upon heating at about 175.degree. C. for about five
minutes, Form B typically converts to Form A.
[0089] When stored for a period of about 85 days under two
different temperature/relative humidity stress conditions (room
temperature/0% RH and 40.degree. C./93% RH), Form B does not
convert to a different form.
[0090] In sum, Form B is a hemihydrated, crystalline solid that
melts at about 267.degree. C. Interconversion studies show that
Form B converts to Form E in aqueous solvent systems, and converts
to other forms in acetone and other anhydrous systems.
[0091] 5.2.3 Form C
[0092] Form C can be obtained from evaporations, slurries and slow
cools in acetone solvent systems. A representative XRPD pattern of
this form is shown in FIG. 12. The data are characterized by peaks
at approximately 15.5 and 25 degrees 2.theta..
[0093] Solution proton NMR indicates that the 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione molecule is intact.
Representative IR and Raman spectra are shown in FIGS. 13 and 14,
respectively. The IR spectrum of Form C is characterized by peaks
at approximately 3466, 3373, and 3318 cm.sup.-1. The Raman spectrum
of Form C is characterized by peaks at about 3366, 3321, 1101, and
595 cm.sup.-1.
[0094] Representative thermal characteristics for Form C are
plotted in FIG. 15. Form C loses about 10.02% volatiles up to about
175.degree. C., indicating it is a solvated material. Weight loss
above about 175.degree. C. is attributed to decomposition.
Identification of volatiles in Form C can be accomplished with
TG-IR experiments. The representative IR spectrum captured after
several minutes of heating, as depicted in FIG. 13, when compared
with a spectral library, shows acetone to be the best match.
Calculations from TGA data show that Form C is a hemisolvate
(approximately 0.497 moles of acetone). The DSC curve for Form C,
shown in FIG. 15, exhibits endotherms at about 150 and about
269.degree. C. The endotherm at about 150.degree. C. is attributed
to solvent loss based on observations made during hot stage
microscopy experiments. The endotherm at about 269.degree. C. is
attributed to the melt based on hot stage experiments.
[0095] Representative moisture sorption and desorption balance data
are shown in FIG. 17. Form C does not exhibit a significant weight
gain from 5 to 85% relative humidity, when equilibrium is obtained
at each relative humidity step up to 85% relative humidity. At 95%
relative humidity, Form C experiences a significant weight loss of
about 6.03%. As the sample dries from 95% back down to 5% relative
humidity, the sample maintains the weight achieved at the end of
the adsorption phase at each step down to 5% relative humidity.
Form C is capable of converting to Form B when stored at about 84%
relative humidity for approximately ten days.
[0096] Interconversion studies show that Form C typically converts
to Form A in a THF solvent system and typically converts to Form E
in an aqueous solvent system. In an acetone solvent system, Form C
is the most stable form of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. Desolvation
experiments performed on Form C show that upon heating at about
150.degree. C. for about five minutes, Form C will typically
convert to Form A.
[0097] In sum, Form C is a crystalline, hemisolvated solid, which
melts at approximately 269.degree. C. Form C is not hygroscopic
below about 85% RH, but can convert to Form B at higher relative
humidities.
[0098] 5.2.4 Form D
[0099] Form D can be obtained from evaporation in acetonitrile
solvent systems. A representative XRPD pattern of the form is shown
in FIG. 18. The pattern is characterized by peaks at approximately
27 and 28 degrees 2.theta..
[0100] Solution proton NMR indicates that the 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione molecule is intact.
Representative IR and Raman spectra are shown in FIGS. 19 and 20,
respectively. The IR spectrum of Form D is characterized by peaks
at approximately 3509, 2299, and 2256 cm.sup.-1. The Raman spectrum
of Form D is characterized by peaks at approximately 2943, 2889,
2297, 2260, 1646, and 1150 cm.sup.-1.
[0101] Representative thermal characteristics for Form D are
plotted in FIG. 21. Form D loses about 6.75% volatiles up to about
175.degree. C., indicating a solvated material. Weight loss above
about 175.degree. C. is attributed to decomposition. TG-IR
experiments indicate that the volatiles are water and acetonitrile.
Calculations from TG data show that about one mole of water is
present in the sample. A representative DSC curve for Form D
exhibits endotherms at about 122 and about 270.degree. C. The
endotherm at about 122.degree. C. is attributed to loss of
volatiles based on observations made during hot stage microscopy
experiments. The endotherm at about 270.degree. C. is attributed to
the melt based on hot stage experiments.
[0102] Representative moisture sorption and desorption data are
plotted in FIG. 22. Form D does not exhibit a significant weight
gain from 5 to 95% relative humidity when equilibrium is obtained
at each relative humidity step. As the form dries from 95% back
down to 5% relative humidity, it maintains its weight such that at
5% relative humidity the form has typically gained only about 0.39%
by weight (about 0.012 mg) from start to finish. Form A is capable
of converting to Form B when stored at about 84% relative humidity
for approximately ten days.
[0103] Interconversion studies show that Form D is capable of
converting to Form A in a THF solvent system, to Form E in an
aqueous solvent system, and to Form C in an acetone solvent system.
Desolvation experiments performed on Form D show that upon heating
at about 150.degree. C. for about five minutes Form D will
typically convert to Form A.
[0104] In sum, Form D is a crystalline solid, solvated with both
water and acetonitrile, which melts at approximately 270.degree. C.
Form D is either weakly or not hygroscopic, but will typically
convert to Form B when stressed at higher relative humidities.
[0105] 5.2.5 Form E
[0106] Form E can be obtained by slurrying 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione in water and by a slow
evaporation of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione in a solvent system
with a ratio of about 9:1 acetone:water. A representative XRPD
pattern is shown in FIG. 23. The data are characterized by peaks at
approximately 20, 24.5 and 29 degrees 2.theta..
[0107] Representative thermal characteristics of Form E are plotted
in FIG. 24. Form E typically loses about 10.58% volatiles up to
about 125.degree. C., indicating that it is a solvated material. A
second weight loss of an additional about 1.38% was observed
between about 125.degree. C. and about 175.degree. C. Weight loss
above about 175.degree. C. is attributed to decomposition. Karl
Fischer and TG-IR experiments support the conclusion that the
volatile weight loss in Form E is due to water. The representative
DSC curve for Form E exhibits endotherms at about 99, 161 and
269.degree. C. Based on observations made during hot stage
microscopy experiments, the endotherms at about 99 and about
122.degree. C. are attributed to loss of volatiles. The endotherm
at about 269.degree. C. is attributed to the melt based on hot
stage experiments.
[0108] Representative moisture sorption and desorption data are
plotted in FIG. 25. Form E typically does not exhibit a significant
weight change from 5 to 95% relative humidity when equilibrium is
obtained at each relative humidity step. As the sample dried from
95% back down to 5% relative humidity, the sample continues to
maintain weight such that at 5% relative humidity the sample has
lost only about 0.0528% by weight from start to finish.
[0109] Interconversion studies show that Form E can convert to Form
C in an acetone solvent system and to Form G in a THF solvent
system. In aqueous solvent systems, Form E appears to be the most
stable form. Desolvation experiments performed on Form E show that
upon heating at about 125.degree. C. for about five minutes, Form E
can convert to Form B. Upon heating at 175.degree. C. for about
five minutes, Form B can convert to Form F.
[0110] When stored for a period of 85 days under two different
temperature/relative humidity stress conditions (room
temperature/0% RH and 40.degree. C./93% RH) Form E typically does
not convert to a different form. When stored for seven days at room
temperature/0% RH, Form E can convert to a new form, Form H.
[0111] 5.2.6 Form F
[0112] Form F can be obtained by complete dehydration of Form E. A
representative XRPD pattern of Form F, shown in FIG. 26, is
characterized by peaks at approximately 19, 19.5 and 25 degrees
2.theta..
[0113] Representative thermal characteristics of Form A are shown
in FIG. 27. The representative DSC curve for Form F exhibits an
endotherm at about 269.degree. C. preceded directly by two smaller
endotherms indicative of a crystallized form of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
The DSC thermogram does not show any thermal events prior to the
melt, suggesting that it is an unsolvated material.
[0114] 5.2.7 Form G
[0115] Form G can be obtained by slurrying forms B and E in THF. A
representative XRPD pattern of this form, shown in FIG. 28, is
characterized by a peak at approximately 23 degrees 2.theta.. Two
other peaks unique to Form G appear at approximately 21 and 24.5
degrees 2.theta..
[0116] Representative thermal characteristics of Form G are plotted
in FIG. 29. A representative DSC curve for Form G exhibits an
endotherm at about 248.degree. C. followed by a small, broad
exotherm at about 267.degree. C. No thermal events are seen in the
DSC thermogram at lower temperatures, suggesting that it is an
unsolvated material.
[0117] 5.2.8 Form H
[0118] Form H can be obtained by storing Form E at room temperature
and 0% RH for about 7 days. A representative XRPD pattern is shown
in FIG. 30. The pattern is characterized by a peak at 15 degrees
2.theta., and two other peaks at 26 and 31 degrees 2.theta..
[0119] Representative thermal characteristics are shown in FIG. 31.
Form H loses about 1.67% volatiles up to about 150.degree. C.
Weight loss above about 150.degree. C. is attributed to
decomposition. Karl Fischer data shows that Form H typically
contains about 1.77% water (about 0.26 moles), suggesting that the
weight loss seen in the TG is due to dehydration. The DSC
thermogram shows a broad endotherm between about 50.degree. C. and
about 125.degree. C., corresponding to the dehydration of Form H
and a sharp endotherm at about 269.degree. C., which is likely due
to a melt.
[0120] When slurried in water with either Forms A or B, after about
14 days Form H can convert to Form E. When slurried in THF, Form H
can convert to Form A. When slurried in acetone, Form H can convert
to Form C.
[0121] In sum, Form H is a crystalline solid, hydrated with about
0.25 moles of water, which melts at approximately 269.degree.
C.
5.3 Methods of Use and Pharmaceutical Compositions
[0122] Polymorphs of the invention exhibit physical characteristics
that are beneficial for drug manufacture, storage or use. All
polymorphs of the invention have utility as pharmaceutically active
ingredients or intermediates thereof.
[0123] This invention encompasses methods of treating and
preventing a wide variety of diseases and conditions using
polymorphs of
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione.
In each of the methods, a therapeutically or prophylactically
effective amount of the compound is administered to a patient in
need of such treatment or prevention. Examples of such disease and
conditions include, but are not limited to, diseases associated
with undesired angiogenesis, cancer (e.g., solid and blood borne
tumors), inflammatory diseases, autoimmune diseases, and immune
diseases. Examples of cancers and pre-cancerous conditions include
those described in U.S. Pat. Nos. 6,281,230 and 5,635,517 to Muller
et al. and in various U.S. patent applications to Zeldis, including
application Ser. No. 10/411,649, filed Apr. 11, 2003 (Treatment of
Myelodisplastic Syndrome); Ser. No. 10/438,213 filed May 15, 2003
(Treatment of Various Types of Cancer); Ser. No. 10/411,656, filed
Apr. 11, 2003 (Treatment of Myeloproliferative Diseases). Examples
of other diseases and disorders that can be treated or prevented
using compositions of the invention are described in U.S. Pat. Nos.
6,235,756 and 6,114,335 to D'Amato and in other U.S. patent
applications to Zeldis, including Ser. No. 10/693,794, filed Oct.
23, 2003 (Treatment of Pain Syndrome) and Ser. No. 10/699,154,
filed Oct. 30, 2003 (Treatment of Macular Degeneration). The
entirety of each of the patents and patent applications cited
herein is incorporated herein by reference.
[0124] Depending on the disease to be treated and the subject's
condition, polymorphs of the invention can be administered by oral,
parenteral (e.g., intramuscular, intraperitoneal, intravenous, ICV,
intracisternal injection or infusion, subcutaneous injection, or
implantation), inhalation spray, nasal, vaginal, rectal,
sublingual, or topical routes of administration and may be
formulated, alone or together, in suitable dosage unit formulations
containing conventional non-toxic pharmaceutically acceptable
carriers, adjuvants and vehicles appropriate for each route of
administration. Because individual polymorphs have different
dissolution, stability, and other properties, the optimal polymorph
used in methods of treatment may depend on the route of
administration. For example, forms that are readily soluble in
aqueous solutions are preferably used to provide liquid dosage
forms, whereas forms that exhibit great thermal stability may be
preferred in the manufacture of solid dosage forms (e.g., tablets
and capsules).
[0125] Although the physical characteristics of polymorphs can, in
some cases, affect their bioavailability, amounts of the polymorphs
that are therapeutically or prophylactically effective in the
treatment of various disease and conditions can be readily
determined by those of ordinary skill in the pharmacy or medical
arts. In certain embodiments of the invention, a polymorph is
administered orally and in a single or divided daily doses in an
amount of from about 0.10 to about 150 mg/day, or from about 5 to
about 25 mg/day. In other embodiments, a polymorph is administered
every other day in an amount of from about 0.10 to about 150
mg/day, or from about 5 to about 25 mg/day.
[0126] The invention encompasses pharmaceutical compositions and
single unit dosage forms that can be used in methods of treatment
and prevention, which comprise one or more polymorphs of
3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione
and optionally one or more excipients or diluents. Specific
compositions and dosage forms are disclosed in the various patents
and patent applications incorporated herein by reference. In one
embodiment, a single dosage form comprises a polymorph (e.g., Form
B) in an amount of about 5, 10, 25 or 50 mg.
6. EXAMPLES
[0127] 6.1 Polymorph Screen
[0128] A polymorph screen to generate the different solid forms of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione
was carried out as follows.
[0129] A weighed sample of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione (usually about 10 mg)
was treated with aliquots of the test solvent. Solvents were either
reagent or HPLC grade. The aliquots were usually about 200 .mu.L.
Between additions, the mixture was usually shaken or sonicated.
When the solids dissolved, as judged by visual inspection,
estimated solubilities were calculated. Solubilities were estimated
from these experiments based on the total solvent used to provide a
solution. Actual solubilities may have been greater than those
calculated due to the use of too-large solvent aliquots or to a
slow rate of dissolution.
[0130] Samples were created by generating solutions (usually about
30 mg in 20 mL) at elevated temperatures, filtering, and allowing
the solution to evaporate whether in an open vial (hot fast
evaporation) or in a vial covered with aluminum foil containing
pinholes (hot slow evaporation).
[0131] Slurry experiments were also performed. Usually about 25 mg
of solid was placed in either 3 or 5 mL of solvent. The samples
were then placed on orbital shakers at either ambient temperature
or 40.degree. C. for 4-10 days.
[0132] Crystallizations were performed using various cooling
methods. Solid was dissolved in a solvent at an elevated
temperature (e.g., about 60.degree. C.), filtered quickly and
allowed to cool to room temperature. Once at room temperature,
samples that did not crystallize were moved to a refrigerator.
Solids were removed by filtration or decantation and allowed to dry
in the air. Crash cools were performed by dissolving solid in a
solvent at an increased temperature (e.g., about 45-65.degree. C.)
followed by cooling in a dry ice/acetone bath.
[0133] Hygroscopicity studies were performed by placing portions of
each polymorph in an 84% relative humidity chamber for
approximately one week.
[0134] Desolvation studies were carried out by heating each
polymorph in a 70.degree. C. oven for approximately one week.
[0135] Interconversion experiments were carried out by making
slurries containing two forms in a saturated solvent. The slurries
were agitated for approximately 7-20 days at ambient temperature.
The insoluble solids were recovered by filtration and analyzed
using XRPD.
[0136] 6.2 Preparation of Polymorphic Forms
[0137] Eight solid forms of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione were prepared as
described below.
[0138] Form A was obtained by crystallization from various
non-aqueous solvents including 1-butanol, butyl acetate, ethanol,
ethyl acetate, methanol, methyl ethyl ketone, and tetrahydrofuran.
Form B was also obtained by crystallization from the solvents
hexane, toluene and water. Form C was obtained from evaporations,
slurries, and slow cools in acetone solvent systems. Form D was
obtained from evaporations in acetonitrile solvent systems. Form E
was obtained most readily by slurrying 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione in water. Form F was
obtained by complete desolvation of Form E. It is found to be an
unsolvated, crystalline material that melts at about 269.degree. C.
Form G was obtained by slurrying forms B and E in THF. Form H was
obtained by stressing Form E at room temperature and 0% RH for 7
days.
[0139] 6.2.1 Synthesis of Polymorphs B and E
[0140] Form B is the desired polymorph for the active
pharmaceutical ingredient (API) of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. This form has been
used in the formulation of API into drug product for clinical
studies. Three batches were produced as apparent mixtures of
polymorphs in the non-micronized API of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione.
[0141] Development work was carried out to define a process that
would generate polymorph B from this mixture of polymorphs and
could be implemented for strict polymorphic controls in the
validation batches and future manufacturing of API of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
Characterization of polymorphic forms produced during the work was
performed by XRPD, DSC, TGA and KF.
[0142] A process was also developed for the large-scale preparation
of Form E. Polymorph E material was prepared in order to carry out
a comparison with polymorph B drug product in capsule dissolution
testing of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. 150 g of a mixture of
polymorphs in 3 L of water was stirred at room temperature for 48
hours. The product was collected by filtration and dried at
25.degree. C. for 24 hours under vacuum. XRPD, DSC, TGA, KF and
HPLC analyses confirmed that the material isolated was polymorph
E.
[0143] In a preliminary work, it was demonstrated that stirring a
suspension of a mixture of polymorphs of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione with water at high
temperature (75.degree. C.) for an extended period of time
converted this mixture of polymorphs exclusively to form B. Several
specific parameters were identified including temperature, solvent
volume and drying parameters (temperature and vacuum). XRPD, DSC,
TGA, KF and HPLC analyses were used to characterize all of the
batches. After completing the optimization work, the optimized
process was scaled-up to 100-200 g on three lots of API. Drying
studies were carried out at 20.degree. C., 30.degree. C. and
40.degree. C., and 65.degree. C. with a vacuum of 150 mm of Hg. The
results are shown in Tables 1-5.
[0144] The cooling and holding periods of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione slurry were studied.
The experimental laboratory data suggests that polymorph B seems to
be forming first, and overtime equilibration to polymorph E at RT
conditions occurs, therefore generating a mixture of polymorphs B
and E. This result supports the fact that polymorph B seems to be a
kinetic product, and that prolonged processing time converts the
material to polymorph E resulting in a mixture of polymorphs B and
E.
[0145] A laboratory procedure was developed to exclusively produce
polymorph B of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione. The procedure includes
a stirred 10 volume water slurry at .about.75.degree. C. for 6-24
hours. The following preferred process parameters have been
identified: [0146] 1. Hot slurry temperature of 70-75.degree. C.
[0147] 2. Product filtration of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione at 65-75.degree. C.
[0148] 3. Drying under vacuum at 60-70.degree. C. is preferred for
an efficient removal of unbound water in 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione wet cake. [0149] 4. The
filtration step of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione may be a time sensitive
operation. The use of efficient solid-liquid separation equipment
is preferred. [0150] 5. Holding periods of water-wet cake of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione at
KF higher than 5% may cause the kinetic equilibrations of polymorph
B to mixed polymorphs of E and B.
[0151] Drying to KF<4.0% water was achieved in .about.3 hours
(30-70.degree. C., 152 mm Hg). Polymorphs B and E were
distinguished by the water levels as measured by KF and TGA. The
reference sample of polymorph B is micronized API. In order to make
accurate comparison by XRPD samples were gently grinded before
submission for analysis. This increases the clarity of the
identification of the polymorphic form. All samples were analyzed
for XRPD, DSC, TGA, KF and HPLC.
TABLE-US-00001 TABLE 1 Preliminary Studies Reaction Results/ Amount
conditions Analysis conclusion 2 g Water, rt, 48 h XRPD, DSC,
Polymorph E TGA, KF 25 g Water, rt, 48 h XRPD, DSC, Polymorph E
TGA, KF 5 g Water, 70-75.degree. C., XRPD, DSC, Polymorph B 24 h
then rt 24 h TGA, KF 1 g 9:1 Acetone - XRPD, DSC, Polymorph water,
Slow evpo. TGA, KF Mixture 1 g 175.degree. C. 1 h in an XRPD, DSC,
Polymorph A oven TGA, KF 0.5 g (poly- Water, rt, 24 h XRPD, DSC,
Polymorph E morph A) TGA, KF 1 g poly- Water, rt, 48 h XRPD, DSC,
Polymorph E morph B TGA, KF 1 g poly- Water, 70-75.degree. C.,
XRPD, DSC, Polymorph B morph E 24 h TGA, KF 1 g Slurry in heptane
XRPD, DSC, No change TGA, KF
TABLE-US-00002 TABLE 2 Optimization of Temperature, Time and
Solvent Volume Amount Water Temp Time Results/ Amount (mL)
(.degree. C.) (h) conclusion 10 g 50 75 6 Mix 10 g 50 75 24
Polymorph B 10 g 100 70 6 Polymorph B 10 g 100 70 14 Polymorph B 10
g 100 70 21 Polymorph B 10 g 100 75 6 Polymorph B 10 g 100 75 24
Polymorph B 10 g 100 75 6 Polymorph B 10 g 100 75 19 Polymorph B 10
g 100 75 14 Polymorph B 10 g 100 75 24 Polymorph B 5 g 100 75 18
Polymorph B 10 g 100 80 6 Polymorph B 10 g 100 80 20 Polymorph B 10
g 200 45 6 Polymorph B + E 10 g 200 45 24 Polymorph E 10 g 200 60
48 Polymorph B 10 g 200 75 6 Mix 10 g 200 75 24 Polymorph B 10 g
200 75 13 Polymorph B 10 g 200 75 24 Polymorph B
Optimum conditions were determined to be 10 volumes of solvent
(H.sub.2O), 70-80.degree. C. for 6-24 hours.
TABLE-US-00003 TABLE 3 Holding Time Holding Holding Reaction Time
Temp Results/ Amount Conditions (h) (.degree. C.) Conclusion 5 g
Water, 70-75.degree. C., 24 23-25 Polymorph B 24 h 1 g Poly- Water,
70-75.degree. C., 48 23-25 Polymorph E morph B 24 h 2 g Water, 40
mL 16 23-25 Polymorph E 150 g Water, 3.0 L 24 23-25 Polymorph E 150
g Water, 3.0 L 48 23-25 Polymorph E 10 g Water, 100 mL, 18 23-25
Polymorph B 24 h, 75.degree. C. 10 g Water, 100 mL, 18 40 Polymorph
B 24 h, 75.degree. C. 10 g Water, 200 mL, 14 -5 Mix 24 h,
75.degree. C. 10 g Water, 200 mL, 14 23-25 Polymorph E 24 h,
75.degree. C. 10 g Water, 200 mL, 14 40 Mix 24 h, 75.degree. C. 10
g Water, 100 mL, 21 23-25 Polymorph E 24 h, 75.degree. C. 10 g
Water, 100 mL, 21 40 Mix 24 h, 75.degree. C. 10 g Water, 100 mL, 2
23-25 Mix 14 h, 75.degree. C.
Holding time gave mixed results and it was determined that the
material should be filtered at 60-65.degree. C. and the material
washed with 0.5 volume of warm (50-60.degree. C.) water.
TABLE-US-00004 TABLE 4 Scale-up Experiments Amount Water Temp Time
Results/ Amount (L) (.degree. C.) (h) Conclusion 100 g 1.0 75 6
Polymorph B 100 g 1.0 75 22 Polymorph B 100 g 1.0 75 6 Polymorph B
100 g 1.0 75 24 Polymorph B 100 g 1.0 75 6 Polymorph B 100 g 1.0 75
22 Polymorph B
TABLE-US-00005 TABLE 5 Drying Studies Drying Drying Time Temp
Vacuum KF.sctn. Results/ Amount (h) (.degree. C.) (mm Hg) (%)
Conclusion 100 g 0 -- -- 3.690 Polymorph B 100 g 3 30 152 3.452
Polymorph B 100 g 8 30 152 3.599 Polymorph B 100 g 0 -- -- 3.917
Polymorph B 100 g 5 40 152 3.482 Polymorph B 100 g 22 40 152 3.516
Polymorph B 100 g 3 40 152 3.67 Polymorph B 100 g 22 40 152 3.55
Polymorph B *Reaction Conditions: Water 1 L, 75.degree. C., 22-24
h; .sctn.Average of 2 runs.
Drying studies determined that the material should be dried at
35-40.degree. C., 125-152 mm Hg for 3 to 22 h or until the water
content reaches .ltoreq.4% w/w.
[0152] For a large scale preparation of polymorph E (5222-152-B), a
5-L round bottom flask was charged with 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione (150 g, 0.579 mol) and
water (3000 mL, 20 vol). The mixture was mechanically stirred at
room temperature (23-25.degree. C.) for 48 h under nitrogen
atmosphere.
[0153] Samples were taken after 24 h and 48 h before the mixture
was filtered and air-dried on the filter for 1 h. The material was
transferred to a drying tray and dried at room temperature
(23-25.degree. C.) for 24 h. KF analysis on the dried material
showed water content of 11.9%. The material was submitted for XRPD,
TGA, DSC and HPLC analysis. Analysis showed the material was pure
polymorph E.
[0154] For a large scale preparation of polymorph B (5274-104), a 2
L-3-necked round bottom flask was charged with 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione (polymorph mixture, 100
g, 0.386 mol) and water (1000 mL, 10.0 vol). The mixture was heated
to 75.degree. C. over approximately 30 minutes with mechanical
stirring under nitrogen atmosphere.
[0155] Samples were taken after 6 h and 24 h before the mixture was
allowed to cool to 60-65.degree. C., filtered and the material
washed with warm (50-60.degree. C.) water (50 mL, 0.5 vol). The
material was transferred to a drying tray and dried at 30.degree.
C., 152 mm Hg for 8 h. KF analysis on the dried material showed
water content of 3.6%. After grinding the material was submitted
for XRPD, TGA, DSC and HPLC analysis. Analysis showed the material
was pure polymorph B. The results of the analyses are shown in
FIGS. 32-46.
[0156] 6.3 X-Ray Powder Diffraction Measurements
[0157] X-ray powder diffraction analyses were carried out on a
Shimadzu XRD-6000 X-ray powder diffractometer using Cu K.alpha.
radiation. The instrument is equipped with a fine-focus X-ray tube.
The tube voltage and amperage were set at 40 kB and 40 mA,
respectively. The divergence and scattering slits were set at
1.degree. and the receiving slit was set at 0.15 mm. Diffracted
radiation was detected by a NaI scintillation detector. A theta-two
theta continuous scan at 3.degree./min (0.4 sec/0.02.degree. step)
from 2.5 degrees 2.theta. to 40 degrees 2.theta. was used. A
silicon standard was analyzed each day to check the instrument
alignment.
[0158] X-ray powder diffraction analyses were also carried out
using Cu K.alpha. radiation on an Inel XRG-3000 diffractometer
equipped with a curved position-sensitive detector. Data were
collected in real time over a theta-two theta range of 120.degree.
at a resolution of 0.03.degree.. The tube voltage and current were
40 kV and 30 mA, respectively. A silicon standard was analyzed each
day to check for instrument alignment. Only the region between 2.5
and 40 degrees 2.theta. is shown in the figures.
[0159] 6.4 Thermal Analysis
[0160] TG analyses were carried out on a TA Instrument TGA 2050 or
2950. The calibration standards were nickel and alumel.
Approximately 5 mg of sample was placed on a pan, accurately
weighed, and inserted into the TG furnace. The samples were heated
in nitrogen at a rate of 10.degree. C./min, up to a final
temperature of 300 or 350.degree. C.
[0161] DSC data were obtained on a TA 2920 instrument. The
calibration standard was indium. Approximately 2-5 mg samples were
placed into a DSC pan and the weight accurately recorded. Crimped
pans with one pinhole were used for analysis and the samples were
heated under nitrogen at a rate of 10.degree. C./min, up to a final
temperature of 350.degree. C.
[0162] Hot-stage microscopy was carried out using a Kofler hot
stage mounted on a Leica Microscope. The instrument was calibrated
using USP standards.
[0163] A TA Instruments TGA 2050 interfaced with a Nicolet model
560 Fourier transform IR spectrophotometer, equipped with a globar
source, XT/KBr beamsplitter, and deuterated triglycine sulfate
(DTGS) detector, was utilized for TG-IR experiments. The IR
spectrometer was wavelength calibrated with polystyrene on the day
of use while the TG was temperature and weight calibrated biweekly,
using indium for the temperature calibration. A sample of
approximately 10 mg of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione was weighed into an
aluminum pan and heated from 25 to 30.degree. C. to 200.degree. C.
at a rate of 20.degree. C./min with a helium purge. IR spectra were
obtained in series, with each spectrum representing 32 co-added
scans at a resolution of 4 cm.sup.-1. Spectra were collected with a
17-second repeat time. TG/IR analysis data are presented as
Gram-Schmidt plots and IR spectra linked to the time. Gram-Schmidt
plots show total IR intensity vs. time; hence, the volatiles can be
identified at each time point. They also show when the volatiles
are detected. From the Gram-Schmidt plots, time points were
selected and the IR spectra of these time points are presented in
the stacked linked spectra. Each spectrum identifies volatiles
evolving at that time point. Volatiles were identified from a
search of the HR Nicolet TGA vapor phase spectral library. The
library match results are also presented to show the identified
vapor.
[0164] 6.5 Spectroscopy Measurements
[0165] Raman spectra were acquired on a Nicloet model 750 Fourier
transform Raman spectrometer utilizing an excitation wavelength of
1064 nm and approximately 0.5 W of Nd:YAG laser power. The spectra
represent 128 to 256 co-added scans acquired at 4 cm.sup.-1
resolution. The samples were prepared for analysis by placing the
material in a sample holder and positioning this in the
spectrometer. The spectrometer was wavelength calibrated using
sulfur and cyclohexane at the time of use.
[0166] The mid-IR spectra were acquired on a Nicolet model 860
Fourier transform IR spectrophotmeter equipped with a globar source
XT/KBr beamsplitter and a deuterated triglycine sulfate (DTGS)
detector. A Spectra-Tech, Inc. diffuse reflectance accessory was
utilized for sampling. Each spectrum represents 128 co-added scans
at a spectral resolution of 4 cm.sup.-1. A background data set was
acquired with an alignment mirror in place. A single beam sample
data set was then acquired. Subsequently, a log 1/R (where
R=reflectance) spectrum was acquired by rationing the two data sets
against each other. The spectrophotometer was calibrated
(wavelength) with polystyrene at the time of use.
[0167] 6.6 Moisture Sorption/Desorption Measurements
[0168] Moisture sorption/desorption data were collected on a VTI
SGA-100 moisture balance system. For sorption isotherms, a sorption
range of 5 to 95% relative humidity (RH) and a desorption range of
95 to 5% RH in 10% RH increments was used for analysis. The sample
was not dried prior to analysis. Equilibrium criteria used for
analysis were less than 0.0100 weight percent change in 5 minutes
with a maximum equilibration time of 3 hours if the weight
criterion was not met. Data were not corrected for the initial
moisture content of the samples.
[0169] 6.7 Solution Proton NMR Measurements
[0170] NMR spectra not previously reported were collected at SSCI,
Inc, 3065 Kent Avenue, West Lafayette, Ind. Solution phase .sup.1H
NMR spectra were acquired at ambient temperature on a Bruker model
AM spectrometer. The .sup.1H NMR spectrum represents 128 co-added
transients collected with a 4 .mu.sec pulse and a relaxation delay
time of 5 seconds. The free induction decay (FID) was exponentially
multiplied with a 0.1 Hz Lorentzian line broadening factor to
improve the signal-to-noise ratio. The NMR spectrum was processed
utilizing GRAMS software, version 5.24. Samples were dissolved in
dimethyl sulfoxide-d.sub.6.
[0171] The scope of this invention can be understood with reference
to the appended claims.
[0172] 6.8 Intrinsic Dissolution and Solubility Studies
[0173] Intrinsic dissolution experiments were conducted on Form A
(anhydrous), Form B (hemihydrate), and Form E (dihydrate) of
3-(4-amino-1-oxo-1,3 dihydro-isoindol-2-yl)-piperidine-2,6-dione.
Equilibrium solubility experiments were conducted on Forms A and B.
Aliquots were analyzed by ultraviolet-visible spectrophotometry,
and the solids remaining from each experiment were analyzed by
X-ray powder diffraction (XRPD).
6.8.1 Experimental
[0174] 6.8.1.1 Dissolution
[0175] Dissolution experiments were carried out in a VanKel
VK6010-8 dissolution apparatus equipped with a VK650A
heater/circulator. An intrinsic dissolution apparatus (Woods
apparatus) was used. Samples were compressed at 1.5 metric tons
(1000 psi) for 1 min using the Woods apparatus in a hydraulic
press, giving a sample surface of 0.50 cm.sup.2. A dissolution
medium consisting of 900 mL HCl buffer, pH 1.8, with 1% sodium
lauryl sulfate, was used for each experiment. The medium was
degassed by vacuum filtration through a 0.22-.mu.m nylon filter
disk and maintained at 37.degree. C. The apparatus was rotated at
50 rpm for each experiment. Aliquots were filtered immediately
using 0.2-.mu.m nylon syringe filters. In some cases, the
undissolved solids were recovered and analyzed by X-ray powder
diffraction (XRPD).
[0176] 6.8.1.2 Solubility
[0177] Equilibrium solubility experiments were conducted in a
100-mL, three-neck, round-bottom flask immersed in a constant
temperature oil bath maintained at 25.degree. C. A solid sample of
400-450 mg was stirred in 50 mL of dissolution medium (HCl buffer,
pH 1.8, with 1% sodium lauryl sulfate) using a mechanical stir rod.
Aliquots were filtered using 0.2-.mu.m nylon syringe filters and
immediately diluted 1 mL.fwdarw.50 mL, then 5 mL.fwdarw.25 mL with
dissolution medium in Class A glassware, a final dilution factor of
250.
[0178] 6.8.1.3 UV-Vis Spectrophotometry
[0179] Dissolution and solubility samples solutions were analyzed
by a Beckman DU 640 single-beam spectrophotometer. A 1.000-cm
quartz cuvette and an analysis wavelength of 228.40 nm were
utilized. The detector was zeroed with a cuvette filled with
dissolution medium.
[0180] 6.8.1.4 X-Ray Powder Diffraction
[0181] XRPD analyses were carried out on a Shimadzu XRD-6000 X-ray
powder diffractometer using Cu K.alpha. radiation. The instrument
is equipped with a fine focus X-ray tube. The tube power and
amperage were set at 40 kV and 40 mA, respectively. The divergence
and scattering slits were set at 1.degree. and the receiving slit
was set at 0.15 mm. Diffracted radiation was detected by a NaI
scintillation detector. A theta-two theta continuous scan at
3.degree./min (0.4 sec/0.02.degree. step) from 2.5 to 40.degree.
2.theta. was used. A silicon standard was analyzed each day to
check the instrument alignment. Samples were packed in an aluminum
holder with silicon insert.
6.8.2 Results
[0182] The results of these solubility and intrinsic studies are
summarized in Table 6. Both the solubility and dissolution
experiments were conducted in a medium of HCl buffer, pH 1.8,
containing 1% sodium lauryl sulfate. Form A was found to be
unstable in the medium, converting to Form E. The solubilities of
Forms A, B, and E were estimated to be 6.2, 5.8, and 4.7 mg/mL,
respectively. The dissolution rates of Forms A, B, and E were
estimated to be 0.35, 0.34, and 0.23 mg/mL, respectively.
[0183] 6.8.2.1 UV-Vis Spectrophotometry Method Development
[0184] A UV-Vis scan of the dissolution medium (blanked with an
empty cuvette) was done to identify any interfering peaks. A small
peak at 225 nm was present as shown in FIG. 47.
[0185] Solutions of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione at varying
concentrations were analyzed by UV-Vis spectrophotometry. A
preliminary scan of a 1.0 mg/mL solution was done, with the
instrument blanked with dissolution medium. The solution was highly
absorbing and noisy from 200-280 nm, making dilution necessary.
[0186] A 0.04 mg/mL solution of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione was then scanned from
200-300 nm. The plot was still noisy between 200 and 230 nm as
shown in FIG. 48. The sample was further diluted to 0.008 mg/mL. A
wavelength scan of 200-350 nm for this sample showed a peak a 228.4
nm with no interference, as shown in FIG. 49. Therefore, a
wavelength of 228.4 was chosen for analysis of the solubility and
dissolution samples.
[0187] A six-point calibration curve was generated with standards
of the following concentrations: 0.001 mg/mL, 0.002 mg/mL, 0.005
mg/mL, 0.010 mg/mL, 0.015 mg/mL, and 0.020 mg/mL (Notebook 569-90).
A linearity coefficient of R.sup.2=0.9999 was obtained as shown in
FIG. 50.
[0188] 6.8.2.2 Solubility
[0189] A sample consisting of 449.4 mg Form A was slurried in
dissolution medium. Particle size was not controlled. Aliquots were
taken at 7, 15, 30, 60, 90, and 150 min. The concentration reached
6.0 mg/mL by the first time point. The highest concentration
reached was 6.2 mg/mL, at 30 min. From that point the concentration
decreased, reaching 4.7 mg/mL at 150 min as in FIG. 51. The solids
remaining at the final time point were analyzed by XRPD and found
to be Form E as shown in Table 7. No peaks attributed to Form A can
be seen in the pattern. Since the concentration did not plateau at
4.7 mg/mL, the solubility of Form E may be lower than that.
[0190] A sample consisting of 401.4 mg Form B was slurried in
dissolution medium. Particle size was not controlled. Aliquots were
taken at 7, 15, 30, 60, 90, 180, 420, and 650 min. Form B dissolved
much more slowly than Form A, reaching 3.3 mg/mL in 90 min. The
concentration stabilized at 5.6-5.7 mg/mL at the final three time
points as in FIG. 52. The remaining solids were shown to be Form B
as in Table 7, suggesting Form B has good stability in water.
[0191] A summary of the solubilities is given in Table 6. The
amounts dissolved at each time point are shown in Tables 8 and
9.
TABLE-US-00006 TABLE 6 Summary of Results Average Intrinsic
Intrinsic Intrinsic Dissolution Form Solubility Dissolution #1
Dissolution #2 Rate Form A 6.2 mg/mL 0.35 0.22.sup.a 0.29.sup.a
Form B 5.8 mg/mL 0.35 0.32 0.34 Form E 4.7 mg/mL 0.21 0.25 0.23
.sup.aThe Form A dissolution experiment #2 may have converted to
Form E on the surface of the disk, skewing the average rate
lower.
TABLE-US-00007 TABLE 7 Experimental Details Experiment Final Form
Pressed Form A A Pressed Form B B Form A Solubility E Form B
Solubility B Form A Dissolution -- Form A Dissolution A Form B
Dissolution -- Form B Dissolution B Form E Dissolution E Form E
Dissolution --
TABLE-US-00008 TABLE 8 Form A Solubility Time Point (min)
Concentration (mg/mL) 7 6.00 15 6.11 30 6.16 60 6.10 90 5.46 150
4.73
TABLE-US-00009 TABLE 9 Form B Solubility Time Point (min)
Concentration (mg/mL) 7 1.63 15 2.14 30 2.33 60 2.94 90 3.34 180
5.67 420 5.76 650 5.61
[0192] 6.8.2.3 Intrinsic Dissolution
[0193] Approximately 200 mg each of Forms A and B were compressed
into disks in the Woods apparatus using 2 metric tons of pressure.
The samples were subsequently scraped out, ground gently, and
analyzed by XRPD. The study showed that compression and grinding
does not cause a form change in either case. (See Table 7).
[0194] Two preliminary dissolution runs were performed. The disks
fractured to some extent in both experiments, compromising the
requirement of constant surface area.
[0195] The first experiment of intrinsic dissolution that strictly
followed the USP chapter on intrinsic dissolution utilized
approximately 150 mg each of Forms A and B. Seven aliquots,
beginning at 5 min and ending at 90 min, were taken to maintain
sink conditions. The experiment resulted in linear dissolution
profiles, with a rate of 0.35 mg per cm.sup.2 per minute for both
forms. The Form E experiment was done later under the same
conditions and added to the graph for comparison. (See FIG. 53).
The Form E dissolution rate was 0.21 mg per cm.sup.2 per minute,
significantly lower than the dissolution rate of Forms A and B.
This is in line with expectations based on the solubility data. The
crystal form of the remaining solids did not change in any
case.
[0196] The second experiment utilized approximately 250 mg each of
Forms A and B. The Form E experiment (135 mg) was done later and
added to the graph for comparison. (See FIG. 54). Nine aliquots
were taken, beginning at 5 min and ending at 150 min. The
dissolution rates were 0 22, 0.32, and 0.25 mg per cm.sup.2 per
minute, respectively, for Forms A, B, and E. The dissolution rate
for Form A in this experiment was low, while the rates for Forms B
and E were similar to those found in the first experiment. It is
believed that in this case, a thin layer of the Form A sample disk
may have converted to Form E upon exposure to water. This is
supported by the evidence of rapid conversion of Form A to Form E
in the solubility experiment. The diffraction pattern of the
undissolved solids does not indicate a form change. However, the
bulk of the sample disk is not exposed to water. Therefore, the
true intrinsic dissolution rate of Form A is believed to be close
to 0.35 mg per cm.sup.2 per minute. An insufficient quantity of
Form A was available to repeat the experiment.
[0197] A summary of the intrinsic dissolution rates is given in
Table 6. The amounts dissolved at each time point are summarized in
Tables 10 and 11.
TABLE-US-00010 TABLE 10 Intrinsic Dissolution Experiment #1 Results
Time Point Form A .sup.a Form B .sup.a Form E .sup.a 5 min 5.76
.sup. 10.80 .sup.b 2.70 10 min 7.73 6.85 4.13 20 min 11.31 10.25
6.96 30 min 15.59 14.35 9.60 45 min 21.98 20.57 12.57 60 min 27.11
25.70 15.16 90 min 34.17 34.34 20.82 .sup.a Results are reported as
Cumulative Amount Dissolved per Unit Area (mg/cm2) .sup.b This date
point not included in graph since the value is higher than the next
two data points.
TABLE-US-00011 TABLE 11 Intrinsic Dissolution Experiment #2 Results
Time Point Form A .sup.a Form B .sup.a Form E .sup.a 5 min 4.50
5.04 3.06 10 min 5.22 6.12 4.31 20 min 7.54 7.73 11.40 30 min 11.46
12.72 11.93 45 min 15.01 17.33 14.72 60 min 18.38 21.93 18.52 90
min 24.38 31.64 26.24 120 min 30.35 41.31 33.56 150 min 35.26 49.54
40.82 .sup.a Results are reported as Cumulative Amount Dissolved
per Unit Area (mg/cm2)
6.9 Analyses of Mixtures of Polymorphs
[0198] This invention encompasses mixtures of different polymorphs.
For example, an X-ray diffraction analysis of one production sample
yielded a pattern that contained two small peaks seen at
approximately 12.6.degree. and 25.8.degree. 2.theta. in addition to
those representative of Form B. In order to determine the
composition of that sample, the following steps were performed:
[0199] 1) Matching of the new production pattern to known forms
along with common pharmaceutical excipients and contaminants;
[0200] 2) Cluster analysis of the additional peaks to identify if
any unknown phase is mixed with the original Form B; [0201] 3)
Harmonic analysis of the additional peaks to identify if any
preferred orientation may be present or if any changes in the
crystal habit may have occurred; and [0202] 4) Indexing of the unit
cells for both Form B and the new production sample to identify any
possible crystallographic relationships. Based on these tests,
which can be adapted for the analysis of any mixture of polymorphs,
it was determined that the sample contained a mixture of polymorph
forms B and E.
6.10 Dosage Form
[0203] Table 12 illustrates a batch formulation and single dosage
formulation for a 25 mg single dose unit of a polymorphic form of
3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione.
TABLE-US-00012 TABLE 12 Formulation for a 25 mg capsule Percent By
Quantity Quantity Material Weight (mg/tablet) (kg/batch)
Polymorphic Form of 3-(4- 40.0% 25 mg 16.80 kg amino-1-oxo-1,3
dihydro- isoindol-2-yl)-piperidine-2,6- dione Pregelatinized Corn
Starch, NF 59.5% 37.2 mg 24.99 kg Magnesium Stearate 0.5% 0.31 mg
0.21 kg Total 100.0% 62.5 mg 42.00 kg
[0204] The pregelatinized corn starch (SPRESS B-820) and
polymorphic form of 3-(4-amino-1-oxo-1,3
dihydro-isoindol-2-yl)-piperidine-2,6-dione components are passed
through a screen (i.e., a 710 .mu.m screen) and then loaded into a
Diffusion Mixer with a baffle insert and blended for about 15
minutes. The magnesium stearate is passed through a screen (i.e., a
210 .mu.m screen) and added to the Diffusion Mixer. The blend is
then encapsulated in capsules using a Dosator type capsule filling
machine.
[0205] The entire scope of this invention is not limited by the
specific examples described herein, but is more readily understood
with reference to the appended claims.
* * * * *