An Exploratory Study of Type II [3 + 4] Cycloadditions between Vinylcarbenoids and Dienes
作者:Huw M. L. Davies、Rebecca L. Calvo、Robert J. Townsend、Pingda Ren、R. Melvyn Churchill
DOI:10.1021/jo991959b
日期:2000.7.1
dirhodium tetracarboxylate catalyzed decomposition of vinyldiazoacetates. The [3 + 4] cycloaddition is generally considered to occur by a tandem cyclopropanation/Cope rearrangement, although evidence is presented that with these substrates the [3 + 4] cycloaddition may occur in a concerted manner.
乙烯基类化合物和呋喃之间的分子内II型[3 + 4]环加成反应是构建5-oxo-10-oxatricyclo [6.2.1.0(4,9)] undeca-3,8(11)-二烯的一种实用方法,包含两个反布雷特双键。这些三环系统功能齐全,可以最终加工成天然产物CP-263,114。铑稳定的乙烯基类胡萝卜素是通过四羧酸二铑催化乙烯基重氮乙酸酯的分解而生成的。通常认为[3 + 4]环加成是通过串联环丙烷化/ Cope重排发生的,尽管有证据表明,使用这些底物,[3 + 4]环加成可能以协同方式发生。