Palladium-Catalyzed Conjugate Allylation Reactions of α,β-Unsaturated <i>N</i>-Acylpyrroles
作者:Michael B. Shaghafi、Benjamin L. Kohn、Elizabeth R. Jarvo
DOI:10.1021/ol801830h
日期:2008.11.6
Conjugate allylation reactions of alpha,beta-unsaturated N-acylpyrroles using allylboronic ester are catalyzed by a palladium complex that is ligated by a bidentate N-heterocyclic carbene. A variety of functional groups are tolerated, and substrates functionalized with electron-withdrawing groups react to afford the highest yields of products. Regioselectivity for 1,4-allylation over 1,2-allylation
使用烯丙基硼酸酯的α,β-不饱和N-酰基吡咯的共轭烯丙基化反应由与双齿N-杂环卡宾连接的钯配合物催化。可以容忍各种官能团,并且用吸电子基团官能化的底物反应可提供最高收率的产物。证明了1,4-烯丙基化相对于1,2-烯丙基化的区域选择性,并且机理实验与亲核烯丙基钯中间体的形成是一致的。