C(O[C@@H:5]1[C@H:10]2[C@H:11]3[C@H:21]([CH2:22][CH2:23][C@:8]2([CH3:9])[C:7](=[O:26])[CH2:6]1)[C@:19]1([CH3:20])[C:14]([CH:15]=[C:16]([O:24][CH3:25])[CH2:17][CH2:18]1)=[CH:13][CH2:12]3)(=O)C.[I-].[CH3:28][S+](C)(C)=O.[OH-].[K+]>O>[CH2:28]1[C@@H:6]2[C:7](=[O:26])[C@:8]3([CH2:23][CH2:22][C@H:21]4[C@@H:11]([CH2:12][CH:13]=[C:14]5[C@:19]4([CH3:20])[CH2:18][CH2:17][C:16]([O:24][CH3:25])=[CH:15]5)[C@@H:10]3[C@H:5]12)[CH3:9]The 15α-acetoxy-3-methoxy-androsta-3,5-diene-17-one of the general formula (V) is treated with a reagent prepared in situ from trimethylsulfoxonium iodide and potassium hydroxide in a solvent, the reaction mixture is stirred for 6 hours then added to water. The precipitate is filtered off, washed to remove the mother liquor and dried. Finally the 15β,16β-methylene-3-methoxy-androsta-3,5-diene-17-one obtained (a compound of the general formula (VII)) is crystallized from methanol.
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