FIELD: chemical industry. SUBSTANCE: present invention describes method -5α-- substituted 4-aza-7β--androstan-3-ones and related compounds which are 5α--reductase inhibitors. Method comprises reducing corresponding androstenone with lithium and liquid ammonia, contacting product with isomerizing agent, oxidizing product to secoacid and reacting secoacid with amine, cyclization to form 5- aza-5--5α--androstan-3-ones. EFFECT: more efficient preparation method. 6 cl, 2 tbl
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