[EN] PROCESS FOR THE PREPARATION OF 17ß-SUBSTITUTED-3-OXO-4-AZA-5ALPHA-ANDROSTANE DERIVATIVES [FR] PROCEDE DE PREPARATION DE DERIVES DE 17ss-SUBSTITUE-3-OXO-4-AZA-5ALPHA-ANDROSTANE
[EN] PROCESS FOR THE PREPARATION OF 17ß-SUBSTITUTED-3-OXO-4-AZA-5ALPHA-ANDROSTANE DERIVATIVES [FR] PROCEDE DE PREPARATION DE DERIVES DE 17ss-SUBSTITUE-3-OXO-4-AZA-5ALPHA-ANDROSTANE