Claims
- 1. A process for producing a crystalline polymorph of 1,3-di-cyclopropylmethyl-8-amino xanthine, Form I, which process comprisesa) dissolving 1,3-di-cyclopropylmethyl-8-amino xanthine in 1-propanol or in a 1-propanol:water admixture; and b) cooling the solution to crystallize out of solution the desired polymorphic Form I, as characterized in any one of FIGS. 1, 4, 20, or wherein Form I exhibits a single crystal X-ray crystallographic analysis with (a) crystal parameters that are approximately equal to the following: Crystal shape (mm)Flat needlesCrystal dimensions1.0 × 0.12 × 0.08 mmCrystal colorColorlessSpace GroupP1 triclinic #2Temperature295 KCell Constantsa = 10.829(2)Åb = 12.636(2)Åc = 5.105(3)Åalpha (α) = 99.48(4)beta (β) = 91.53(4)gamma (γ) = 83.84(3)Volume685.0(8)Å3Molecules/unit cell (Z)4Density, (ρ) g/cm=31.354μ7.362 cm−1F(000)292 the atomic positions of all atoms relative to the origin of the unit cell as represented in the tables of FIGS. 12 to 15.
- 2. The process according to claim 1 wherein the temperature for crystallization of the Form I polymorph from the 1-propanol or 1-propanol:water admixture of part (a) is from about 0 to about 25° C.
- 3. The process according to claim 2 wherein the time for crystallization of the polymorph from the 1-propanol or 1-propanol:water admixture of part (a) is from about 15 to about 120 minutes.
- 4. The process according to claim 1 wherein the xanthine is dissolved by heating the 1-propanol to reflux conditions.
Parent Case Info
This application claims the benefit of provisional application No. 60/063,238 filed Oct. 23, 1997.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/US98/22451 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/20625 |
4/29/1999 |
WO |
A |
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5734051 |
Spicer et al. |
Mar 1998 |
A |
5981535 |
Spicer et al. |
Nov 1999 |
A |
Foreign Referenced Citations (2)
Number |
Date |
Country |
WO 9205175 |
Apr 1992 |
WO |
WO 9205176 |
Apr 1992 |
WO |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/063238 |
Oct 1997 |
US |