Polymorphic and other crystalline forms of cis-FTC
First Claim
1. A dehydrated crystalline form of (±
- )-cis-FTC prepared by a method comprising;
a. dissolving a first crystalline form of (±
)-cis-FTC in water;
b. recrystallizing the dissolved (±
)-cis-FTC; and
c. dehydrating the recrystallized (±
)-cis-FTC;
wherein the dehydrated crystalline form of (±
)-cis-FTC is substantially in the absence of Form I (−
)-cis-FTC or substantially in the absence of hydrated crystalline (±
)-cis-FTC.
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Accused Products
Abstract
Solid phases of (−)-cis-FTC, which are designated herein as amorphous (−)-FTC and Forms II and III (−)-cis-FTC) are provided that can be distinguished from Form I (−)-cis-FTC by X-ray powder diffraction patterns, thermal properties, and methods of manufacture. A hydrated crystalline form of (±)-cis-FTC (i.e. racemic cis-FTC), and a dehydrated form of the hydrate, are also provided, and can similarly be distinguished from other forms of FTC by X-ray powder diffraction patterns, thermal properties, and methods of manufacture. These FTC forms can be used in the manufacture of other forms of FTC, or in pharmaceutical compositions. Particularly preferred uses of these forms are in the treatment of HIV or hepatitis B.
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Citations
9 Claims
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1. A dehydrated crystalline form of (±
- )-cis-FTC prepared by a method comprising;
a. dissolving a first crystalline form of (±
)-cis-FTC in water;b. recrystallizing the dissolved (±
)-cis-FTC; andc. dehydrating the recrystallized (±
)-cis-FTC;wherein the dehydrated crystalline form of (±
)-cis-FTC is substantially in the absence of Form I (−
)-cis-FTC or substantially in the absence of hydrated crystalline (±
)-cis-FTC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- )-cis-FTC prepared by a method comprising;
Specification