Eine einfache Methode zur Herstellung von in Ring A ungesättigten 9, 11‐Dehydro‐16α‐methyl‐steroiden. Über Steroide, 162. Mitteilung

A study of the reactions involved in the preparation of 16α‐methyl‐17α‐hydroxy‐21‐acetoxy‐Δ 1;4;9,11 ‐pregnatriene‐3, 20‐dione (V) from the corresponding 11α‐sulfonyloxy‐2,4‐dibromo‐allopregnane‐3,20‐diones led to a process in which all three substituents in 2‐, 4‐ and 11α‐positions are eliminated simultaneously. 2‐Halogen‐Δ 4;9,11 ‐pregnadiene‐3,20‐diones were formed as by‐products which were reduced to the halogen‐free dienes.