Catalytic α-Allylation of Enones with Alcohols <i>via</i>
[Gold(I)]-Mediated [3,3]-Sigmatropic Rearrangement of Propargylic Carboxylates
作者:Elisabetta Manoni、Mario Daka、Marco M. Mastandrea、Assunta De Nisi、Magda Monari、Marco Bandini
DOI:10.1002/adsc.201600113
日期:2016.4.28
The site‐selective α‐allylic alkylation of enones with alcohols via gold‐triggered formation of nucleophilic allenoates by means of [3,3]‐sigmatropic rearrangements of propargylic carboxylates is reported. A range of α‐alkylated enones is obtained in high yields in the presence of the gold complex [JohnPhosAu(ACN)]SbF6 (2 mol%) as the promoting agent. Examples of allylation/Friedel–Crafts alkylation
据报道,通过炔丙基羧酸酯的[3,3]-σ重排,通过金触发的亲核烯丙酸酯的形成,烯醇与醇发生了位点选择性α-烯丙基烷基化反应。在金络合物[JohnPhosAu(ACN)] SbF 6(2 mol%)作为促进剂的存在下,可以高收率获得一系列α-烷基化的烯酮。还提供了烯丙基化/ Friedel-Crafts烷基化序列的示例,可通过单罐法以中等收率递送高密度官能化的二氢茚和二氢苯并[7]环戊烯。记录了在反应过程中传递的布朗斯台德酸度(即新戊酸)在协助碳正离子中间体形成中的作用。