Cyclopentane ring formation in the cycloaddition reaction of 3-alkenyl radicals to radicophilic olefins
作者:Radomir N. Saičić、Živorad Čeković
DOI:10.1016/s0040-4020(01)81532-5
日期:1990.1
well as of 5- -cyclization of intermediary 5-hexenyl type radical (), was achieved. The fate of intermediary cyclopentylmethyl radicals ( and ) depends on the nature of substituents attached to radical carbon. In case of alkyl groups (), the nucleophilic reactivity of radical intermediates was increased and an intermolecular addition reaction occurred with the formation of a new C-C bond. However, in
研究了在电子缺陷的烯键(和)上对3烯基基团(和)的区域选择性加成,随后的分子内5-环化以及向亲核性双键的重复加成,并将其组合为一系列反应,以制备环戊烷衍生物(和)。实现了除电子缺陷的烯键()上的3-烯基自由基()的高区域选择性,以及中间5-己烯基型自由基()的5-环化的高区域选择性。中间环戊基甲基自由基(和)的命运取决于与自由基碳相连的取代基的性质。如果是烷基(),自由基中间体的亲核反应性增加,并且发生分子间加成反应并形成新的CC键。但是,在芳基的情况下,基团()的中等稳定化抑制了亲核性烯烃键的加成反应,即使过量使用了亲核性烯烃键,在这些情况下,仅发生夺氢。