Process to prepare 11beta,17alpha ,21-trihydroxy-6alpha-methylpregna-1,4-diene-3,20-dione 21-acetate

摘要

The present invention is a novel process for the transformation of 11beta,17alpha dihydroxy-6alpha-methylpregna-1,4-diene-3,20-dione 17-acetate (III) to 11beta,17alpha,21-trihydroxy-6alpha-methylpregna-1,4-diene-3,20-dione 21-acetate (VI)