Studies on Conformation and Reactivity. III. The Polyphosphoric Acid-Catalyzed Ring Opening of 4, 5-Epoxy-3-Oxo Steroids. 3. The Synthesis of 16α, 17-Epoxy-4-Ethyl-Thiopregn-4-Ene-3, 20-Dione and Its Analogs

Chemical and Pharmaceutical Bulletin - Japan

doi 10.1248/cpb.13.1078