Synthesis of 3-epi vitamin D.sub.3 metabolites and analogs
US6040461A · kind A · utility
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3Claims
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Key dates
| Filing date | May 11, 1999 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | May 11, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D303/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of vitamin D.sub.3 compounds of formula I. ##STR1## Wherein A is a single or a double bond; B is a single, cis-double, trans double or a triple bond; R.sub.1 and R.sub.2 are independently hydrogen, a lower alkyl, e.g., a C.sub.1 -C.sub.4 alkyl; R.sub.3 and R.sub.4 are independently a lower alkyl, e.g., C.sub.1 -C.sub.4 alkyl, a hydroxyalkyl, and a haloalkyl, e.g., a fluoroalkyl; and X and Y are independently hydrogen or hydroxy in the case when B is a single or a double bond.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.