Industrial process for the preparation of 17-hydroxy-6beta,7beta;15beta, 16beta-bismethylene-3-oxo-17alpha-pregn-4-ene-21-carboxylic acid y-lactone and key intermediates for this process
US8309712B2 · kind B2 · utility
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6References
14Claims
0Family size
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Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Feb 22, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P15/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to an industrial process for the preparation of 17-hydroxy-6β,7β;15β,16β-bismethylene-3-oxo-17α-pregn-4-ene-21-carboxylic acid γ-lactone of formula (I), and to the key-intermediates for this process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.