Methylation of de-A steroids
US4087436A · kind A · utility
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8Claims
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Assignee
Inventors
Key dates
| Filing date | Jun 23, 1975 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Jun 23, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/26
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Treatment of de-A steroids with a methylation agent at extremely low temperatures, i.e., below -50.degree. C. produces corresponding 10.beta.-methyl-.DELTA..sup.9(11) -deA steroids with a high 10.beta. to 10.alpha. isomer ratio. A number of the product 10.beta.-methyl-.DELTA..sup.9(11) -deA steroids are novel compounds. They are useful as intermediates in the synthesis of known medicinally valuable steroids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.