endo-6-(Hydroxymethyl)bicyclo[3.1.0]hept-3-en-2-one esters and the photochemical challenge: [2+2] cycloaddition versus skeletal rearrangement
作者:Matthieu Le Liepvre、Jean Ollivier、David J. Aitken
DOI:10.1016/j.tetasy.2010.05.043
日期:2010.6
The photochemical reactivity of enantiomerically pure bicyclo[3.1.0]hept-3-en-2-ones has been examined to determine whether a [2+2] cycloaddition with an alkene could be achieved without interference from a photochemically induced skeletal rearrangement. The formation of a tricyclo[5.2.0.02,5]nonan-6-one was indeed the major pathway, exclusively providing the cis-anti-cis isomer. However, the formation
已经检查了对映体纯的双环[3.1.0]庚-3-烯-2-酮的光化学反应性,以确定是否可以在不受到光化学诱导的骨架重排干扰的情况下实现与烯烃的[2 + 2]环加成反应。三环[5.2.0.0 2,5 ]壬南-6-酮的形成确实是主要途径,仅提供了顺-反-顺式异构体。但是,也观察到降冰片壬烯的形成,起始原料中C6处的立体化学加扰也是如此。