Oxymercuration reaction products (I) and/or mercury contaminated steroids (I) are purified by dissolving the compound in a suitable solvent and contacting with a metal dust selected from zinc, copper or iron and a suitable acid.
Process to prepare stabilized monolithium acetylide
申请人:The Upjohn Company
公开号:US04526720A1
公开(公告)日:1985-07-02
The process of the present invention uses an amine to prepare monolithium acetylide which is sufficiently stable at up to 0.degree. and yet is sufficiently reactive to react with 16-substituted-17-keto steroids producing the useful 17.alpha.-ethynyl-17.beta.-hydroxy-16-substituted steroids.
16-Methylene-17-keto steroids (III) are transformed to the corresponding 16-methylene-17.alpha.-hydroxyprogesterones (VII) which are intermediates useful in the production of betamethasone, diflorasone diacetate and melengesterol acetate.
The process of the present invention transforms 16-methylene-17-keto steroids (I) to the corresponding 17.alpha.-ethynyl-17.beta.-hydroxy-16-methylene steroids (II).
16-Methylene-17-keto-steroids are transformed to the corresponding 16-methylene-17a-hydroxyprogesterones which are intermediates useful in the production of betamethasone, diflorasone diacetate and melengesterol acetate. 17a-Hydroxy-6, 16-dimethylene-pregn-4-ene-3, 20-dione is simultaneously isomerized and acylated to 17a-hydroxy-6-methyl-16-methylenepregna-4, 6-diene-3, 20-dione 17-acetate.