The cycloadduct 2 derived from reaction of 3-methoxyestra-1,3,5(10), 14, 16-pentaen-17-yl acetate 1 with 2-chloroacrylonitrile undergoes a tandem reaction sequence in the presence of alkali, leading to (161R)-3-methoxy-17-oxo-15β, 161-cyclo-14, 16β-ethano-14β-estra-1,3,5(10)-triene-161-carbonitrile 4, the X-ray crystal structure of which is reported; compound 4 is converted into new ring D bridged analogues of estrone.
                                    由 3-甲氧基
雌甾-1,3,5(10), 14, 16-
戊烯-17-基
乙酸酯 1 与 
2-氯丙烯腈反应生成的环加载产物 2 在碱存在下发生串联反应序列,生成 (161R)-3-甲氧基-17-氧代-15β, 161-环-14, 16β-ethano-14β-estra-1,3,5(10)-triene-161-carbonitrile 4,并报告了其 X 射线晶体结构;将化合物 4 转化为新的
雌酮 D 环桥类似物。