Chemistry of insect antifeedants from Azadirachta indica(part 13): on the use of the intramolecular Diels–Alder reaction for the construction of trans-fused hydrobenzofuran fragments for azadirachtin synthesis
作者:Hartmuth C. Kolb、Steven V. Ley、Richard N. Sheppard、Alexandra M. Z. Slawin、Stephen C. Smith、David J. Williams、Anthony Wood
DOI:10.1039/p19920002763
日期:——
This paper describes a detailed analysis of the influence of various substituents on the stereochemical outcome of the intramolecular Diels–Alder cyclisation of a number of ether-linked trienes. In particular, the role of diene planarity in governing reaction synchronicity and related twist asynchronicity is delineated. Additionally, the controlling influence of a large dimethyl(phenyl)silyl substituent
本文详细分析了各种取代基对许多以醚连接的三烯的分子内Diels-Alder环化的立体化学结果的影响。特别地,描述了二烯平面度在控制反应同步性和相关的扭转异步性中的作用。另外,还研究了大的二甲基(苯基)甲硅烷基取代基对三烯的亲二烯体部分的控制影响。给出了详细的过渡态分析以及化合物41和46的X射线结构。