METHOD FOR THE SELECTIVE PREPARATION OF 3-OXO-4-AZA-5A-ANDROSTANE COMPOUND

摘要

This invention relates to a method for selectively preparing the 3-oxo-4-aza-5¥á-androstane compound which is used as an intermediate of finasteride by heating 3-oxo-4-aza-5-androstene in a mixture of formic acid and an alkanediol in the presence of zinc.