Acetic Acid → 17-Hydroxy-3-methoxy-14,15-methylen-estra-1,3,5(a)-trien

Reaction equation

[CH3:1][O:2][C:3]1[CH:20]=[CH:19][C:18]2[C@@H:17]3[C@H:8]([C@:9]45[CH2:22][C@H:10]4[CH2:11][C:12](=[O:21])[C@:13]5([CH2:15][CH2:16]3)[CH3:14])[CH2:7][CH2:6][C:5]=2[CH:4]=1.[BH4-].[Na+].C(O)(=O)C>CO>[CH3:1][O:2][C:3]1[CH:20]=[CH:19][C:18]2[C@@H:17]3[C@H:8]([C@:9]45[CH2:22][C@H:10]4[CH2:11][C@@H:12]([OH:21])[C@:13]5([CH2:15][CH2:16]3)[CH3:14])[CH2:7][CH2:6][C:5]=2[CH:4]=1.[CH3:1][O:2][C:3]1[CH:20]=[CH:19][C:18]2[C@@H:17]3[C@H:8]([C@:9]45[CH2:22][C@H:10]4[CH2:11][C@H:12]([OH:21])[C@:13]5([CH2:15][CH2:16]3)[CH3:14])[CH2:7][CH2:6][C:5]=2[CH:4]=1