| 摘要 |
The invention relates to a process for the preparation of 7alpha-methyl hydroxy steroids of the formula I wherein R1 is hydrogen, methyl or C≡CH; R2 is (CH<SUB>2</SUB>)<SUB>n</SUB>OH, wherein n is 0, 1 or 2; by a copper mediated 1,6-conjugate addition of a Grignard reagent CH<SUB>3</SUB>MgX, X being a halogen, to the 4,6-unsaturated 3-ketosteroid of formula II, wherein R1 and R2 are as previously defined, comprising protecting the hydroxy group of the steroid of formula II with a trialkylsilyl group, followed by treating the hydroxy protected steroid with the Grignard reagent. The process of the invention is useful for the production of pharmacologically interesting steroids. |
