Temperature-dependent, competitive 1,3-acyl shift versus decarbonylation of a cyclopropanone intermediate
作者:Ihsan Erden、Jingxiang Ma、Christian Gärtner、Saeed Azimi、Scott Gronert
DOI:10.1016/j.tet.2013.03.053
日期:2013.6
Photooxygenation of 1,1,3-trimethyl-1,2-dihydropentalene gives an unstable endoperoxide, which upon decomposition delivers a bicyclic cyclopropanone intermediate; this species either extrudes CO to give a cycloheptadienone or undergoes a 1,3-acyl shift, both processes occurring most likely in a stepwise manner via diradical intermediates. Alternatively, C3a–C4 cleavage in the dioxygen diradical derived
1,1,3-三甲基-1,2-二氢戊烯的光氧化作用产生不稳定的内过氧化物,分解后产生双环环丙酮中间体;这种物质要么挤出 CO 生成环庚二烯酮,要么经历 1,3-酰基转移,这两个过程最有可能通过双自由基中间体逐步发生。或者,衍生自内过氧化物的双氧双自由基中的 C3a-C4 裂解产生 2-环丙基取代的环戊二烯酮环氧化物。