Process
US6794508B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | May 5, 2003 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | May 5, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J75/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved process for preparing steriods, such as 3-oxo-4-azasteroids, is described. Compounds of this type are known to be useful in the preparation of compounds having 5a-reductase inhibitor activity. The process comprises the hydrogenation of the corresponding steroid alkene in the presence of ammonium acetate, ammonium formate, and/or ammonium propionate and an appropriate catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.