Claims
- 1. (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol in crystalline form.
- 2. The crystalline form of (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol having molecular packing arrangement defined by orthorhombic space group P2(1)2(1)2(1) and unit cell dimensions a=6.6A0, b=15.5A0, c=20.1A0, α=900, β=900 and γ=900.
- 3. A three dimensional structure for (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol as defined by the molecular packing arrangement set forth in claim 2.
- 4. A method of purifying (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol, comprising the steps of:(a) boiling a solvent selected from the group consisting of acetone, ethyl acetate, isopropanol, chloroform, dichloromethane and diethyl ether under inert atmosphere; (b) dissolving a product containing (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol to be purified in said solvent; (c) cooling said solvent and dissolved product below ambient temperature for a sufficient amount of time to form a precipitate of (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol crystals, and (d) separating the (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol crystals from the solvent.
- 5. The method of claim 4 including the further step of allowing said solvent and dissolved product to cool to ambient temperature prior to cooling below ambient temperature.
- 6. The method of claim 4 wherein said inert atmosphere is an argon atmosphere.
- 7. The method of claim 4 wherein said solvent and dissolved product is cooled to between about 35° F. to about 45° F.
- 8. The method of claim 4 wherein the step of separating comprises filtering the solvent and precipitate to obtain the crystals.
- 9. The method of claim 4 including a further step (e) comprising repeating steps (a) through (d) using the recovered crystals from step (d) as the product of step (b).
CROSS REFERENCE TO RELATED APPLICATIONS
This application is based on and claims priority from U.S. Provisional Patent Application No. 60/341,138 filed Dec. 13, 2001.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5936133 |
DeLuca et al. |
Aug 1999 |
A |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/341138 |
Dec 2001 |
US |