Addition of S,S-Diphenylsulfilimine to α,β-Unsaturated Oxosteroids; Synthesis of 16,17a-Aziridino- and 16a-Acetylamino-20-oxosteroids - Kamernitzky, A V; Turuta, A M; Istomina, Z I; El'Yanov, B S (Synthesis, 1982)