Lewis-acid-induced domino transformations of donor–acceptor cyclopropanes, possessing a nucleophilic center embedded in a donor group, into functionalized 2,3-dihydrobenzo[b]furans and 2,3-dihydrobenzo[b]thiophenes are reported herein. An unusual switch of the electrophilic center in the three-membered ring, from the atom bearing a donor substituent to an unsubstituted carbon atom, was achieved by
本文报道了
路易斯酸诱导的供体-受体
环丙烷在供体基团中嵌入一个亲核中心,将多米诺骨转化为官能化的2,3-二氢苯并[ b ]
呋喃和2,3-二氢苯并[ b ]
噻吩。通过明智地选择
路易斯酸来实现三元环中亲电中心从载有供体取代基的原子到未取代的碳原子的不寻常转换,这会诱导
环丙烷异构化为亲电烯烃,并且连接亲核部分和小环的接头的长度。