Process for R-epimer enrichment of 16,17-acetal derivatives of 21-acyloxy pregna,4-dien-11.beta., 16.alpha., 17.alpha.-triol-3,20-dione derivatives
US6787533B1 · kind B1 · utility
4Cited by
10References
17Claims
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Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Jul 8, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J71/0031
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
R-epimer enrichment of 16,17-acetal derivatives of 21-acyloxy pregna-1,4-dien-11beta,16alpha,17alpha-triol-3,20-dione derivatives is effected by fractional crystallization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.