[CH3:1][O:2][C:3]1[CH:20]=[CH:19][C:18]2[C@@H:17]3[C@H:8]([C:9]4[C@@:13]([CH2:15][CH2:16]3)([CH3:14])[C@@H:12]([OH:21])[CH2:11][CH:10]=4)[C@H:7]([CH3:22])[CH2:6][C:5]=2[CH:4]=1.I[CH2:24]I.C([Zn]CC)C.[Cl-].[NH4+]>ClCCl.CCCCCC>[CH3:1][O:2][C:3]1[CH:20]=[CH:19][C:18]2[C@@H:17]3[C@H:8]([C@@:9]45[CH2:24][C@@H:10]4[CH2:11][C@H:12]([OH:21])[C@:13]5([CH2:15][CH2:16]3)[CH3:14])[C@H:7]([CH3:22])[CH2:6][C:5]=2[CH:4]=1i)—A solution of (7α,17β)-3-methoxy-7-methylestra-1,3,5(10),14-tetraen-17-ol [Segaloff, A. et al, Steroids 22, 99 (1973); 25.4 g] and diiodomethane (27 ml) in dry dichloromethane (500 ml) was cooled to 0° C. A solution of diethylzinc in hexane (15% wt., 300 ml) was added in 1 h and the reaction mixture was stirred for 21 h at room temperature. Ice was added and the mixture was poured into a saturated aqueous solution of ammonium chloride. The product was extracted into diethyl ether; the combined organic phases were washed with brine, dried over sodium sulfate, and concentrated under reduced pressure. Column chromatography afforded (7α,14β,15β,17β)-3-methoxy-7-methyl-14,15-methyleneestra-1,3,5(10)-trien-17-ol (6.50 g).
Wird geladen…