1-[1,3-bis-(tert-butyldimethylsilanyloxy)-10,13-dimethyl-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanol 、 在
二苯并-18-冠醚-6 、
potassium tert-butylate 作用下,
以
甲苯 为溶剂,
反应 3.5h,
以24%的产率得到(2R)-1-[(1S)-1-[(1S,3R,9S,10R,13S,14R,17S)-1,3-bis[[tert-butyl(dimethyl)silyl]oxy]-10,13-dimethyl-2,3,4,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl]ethoxy]-3-methyl-3-(2-trimethylsilylethoxymethoxy)butan-2-ol