Probing the Nature and Extent of Stabilization within Foiled Carbenes: Homoallylic Participation by a Neighboring Cyclopropane Ring
作者:Ingrid Malene Apeland、Hanspeter Kählig、Eberhard Lorbeer、Udo H. Brinker
DOI:10.1021/jo4004579
日期:2013.5.17
by either photolysis or thermolysis. Diastereomer 6a thermally decomposed twice as fast as 6b. Carbene 3 was trapped stereoselectively by acrylonitrile and diethylamine in high yields. It behaved as a nucleophilic carbene with electron-poor alkenes, like acrylonitrile, but as an electrophile with very electron-rich species, such as diethylamine. However, when the reactions were performed in cyclohexane
通过光解或热解合成恶二唑啉6以生成内-三环[3.2.1.0 2,4 ]辛烷-8-亚烷基(3)。非对映异构体6a的热分解速度是6b的两倍。丙烯腈和二乙胺以高产率将碳3立体选择性地捕集。它表现为具有电子贫乏烯烃(如丙烯腈)的亲核卡宾,但表现为具有高度电子富集物种(如二乙胺)的亲电子试剂。然而,当反应在环己烷和环己烯中进行时,3的异构化是有利的。7-降冰片烯中双键的取代(1)通过卡宾3的内融合环丙烷单元中的单键导致相似的结果。卡宾3属于箔制卡宾家族。