Process for the preparation of 21-halogeno-21-desoxy-17{60 -acyloxy 20-keto-pregnenes

摘要

21-Halogeno-17 alpha -acyloxy-20-keto-4-pregnenes having physiological properties are prepared by the reaction of a 17 alpha ,21-dihydroxy-20-keto-4-pregnene 17 alpha ,21-orthoester with a triphenylmethyl halide in an organic solvent, said halide being chloride or bromide.