富马酸二乙酯 、 (1R,4aR,4bS,10aR)-1-Benzyloxymethyl-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,9,10,10a-decahydro-phenanthrene 反应 4.0h,
以3.2 g的产率得到5-benzyloxymethyl-5,9-dimethyl-13β,14α-diethoxycarbonyl-16-isopropyltetracyclo[10.2.2.0
1,10.0
4,9]hexadec-15-ene