Cascade Olefin Isomerization/Intramolecular Diels-Alder Reaction Catalyzed by N-Heterocyclic Carbenes
作者:Marcin Kowalczyk、David W. Lupton
DOI:10.1002/anie.201402067
日期:2014.5.19
The addition of an N‐heterocyclic carbene to the carbonyl group of an α,β,γ,δ‐unsaturated enol ester affords a hemiacetal azolium intermediate that enables a cascade olefin isomerization/Diels–Alder reaction, for which mechanistic studies implicate Lewis base catalysis. Preliminary studies into the utility of the products have been undertaken with reductive and oxidative cleavage, giving materials
在α,β,γ,δ-不饱和烯醇酯的羰基上加成N-杂环卡宾可得到半缩醛重氮中间体,该中间体可进行级联烯烃异构化/ Diels-Alder反应,其机理研究暗示了路易斯碱的催化作用。已通过还原和氧化裂解对产品的用途进行了初步研究,为潜在的复杂目标合成提供了材料。