Preparation process for 20-keto-21(S) hydroxy steroid compounds and intermediates
US5384419A · kind A · utility
2Cited by
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Key dates
| Filing date | Jun 2, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Jun 2, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12P41/004
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved process for the preparation of 20-keto-21(S)-hydroxy steroids of the Formula ##STR1## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is alkyl of 1 to 12 carbon atoms, and R.sub.3 is alkyl of 1 to 4 carbon atoms and novel intermediates therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.