[5-[Di(propan-2-yl)amino]-5-oxopent-3-en-2-yl] 3-(1,4-dioxaspiro[4.5]dec-7-en-7-yl)prop-2-enoate 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
邻二甲苯 为溶剂,
反应 20.0h,
以86%的产率得到(1'R,3'aR,8'aS,9'S,9'aS)-1'-methyl-3'-oxo-N,N-di(propan-2-yl)spiro[1,3-dioxolane-2,6'-1,3a,5,7,8,8a,9,9a-octahydrobenzo[f][2]benzofuran]-9'-carboxamide