Highly Regioselective, Sequential, and Multiple Palladium-Catalyzed Arylations of Vinyl Ethers Carrying a Coordinating Auxiliary: An Example of a Heck Triarylation Process
作者:Peter Nilsson、Mats Larhed、Anders Hallberg
DOI:10.1021/ja011019k
日期:2001.8.1
selective palladium-catalyzed diarylations of alkyl vinyl ethers, and (c) a very rapid two-phase protocol for the microwave-assisted hydrolysis of amino-substituted, arylated vinyl ethers constituting an entry to diarylated ethanals and substituted desoxybenzoins. X-ray structures and product patterns support the suggested substrate-controlled Heck reaction pathway. The catalyst-directing alkyl dimethylamino
本文描述了通过氧化加成复合物的分子内呈现开发新的辅助加速 Heck 多芳基化。特定的钯配位二甲氨基的引入允许进行所需的螯合加速和螯合控制的三芳基化和二芳基化反应。我们报告了 (a) Heck 三芳基化过程的第一个例子,(b) 高选择性钯催化的烷基乙烯基醚二芳基化,以及 (c) 一种非常快速的微波辅助水解氨基取代的两相方案,构成二芳基乙醛和取代脱氧安息香素的入口的芳基化乙烯基醚。X 射线结构和产物模式支持建议的底物控制的 Heck 反应途径。在 Heck 多芳基化反应后,通过微波水解快速(1-2 分钟)并有效释放催化剂导向的烷基二甲氨基官能团。释放的芳族羰基化合物随后被分离并充分表征。