[1-[(8R,9S,10R,13S,14S)-10,13-dimethyl-3-oxo-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-17-ylidene]-2-oxoethyl] 2-methylpropanoate 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
乙酸乙酯 为溶剂,
反应 8.0h,
以95%的产率得到[2-[(8R,9S,10R,13S,14S)-10,13-dimethyl-3-oxo-1,2,6,7,8,9,11,12,14,15-decahydrocyclopenta[a]phenanthren-17-yl]-2-oxoethyl] 2-methylpropanoate