tert-butyl 5-(benzyloxycarbonylamino)pent-3-ynoate 、
环戊二烯 在
(2S,6s)-2,6-二-叔丁基-2,3,5,6-四氢-1H-咪唑并[1,2-a]咪唑 作用下,
以
四氢呋喃 、
甲苯 为溶剂,
反应 42.5h,
生成 (1R,2R,4S,Z)-tert-butyl 3-[2-(benzyloxycarbonylamino)ethylidene]bicyclo[2.2.1]hept-5-ene-2-carboxylate 、 (1S,2R,4R,Z)-tert-butyl 3-[2-(benzyloxycarbonylamino)ethylidene]bicyclo[2.2.1]hept-5-ene-2-carboxylate 、
(1R,2S,4S,Z)-tert-butyl 3-[2-(benzyloxycarbonylamino)ethylidene]bicyclo[2.2.1]hept-5-ene-2-carboxylate 、
(1S,2S,4R,Z)-tert-butyl 3-[2-(benzyloxycarbonylamino)ethylidene]bicyclo[2.2.1]hept-5-ene-2-carboxylate