据报道,具有挑战性的(E)-1,6-烯炔的对映体选择性的铑(I)催化的环异构化反应。这种新颖的工艺使具有多种功能的(E)-1,6-炔烃(包括氮,氧和碳束缚的(E)-1,6-炔烃)能够以优异的对映选择性进行环异构化。高收益且操作简单的方式。此外,这种Rh I-二膦催化体系还显示出对(Z)-1,6-烯炔的优异反应性和对映选择性。使用DFT研究概述了使用Rh I -BINAP和Rh I -TangPhos的(E)-和(Z)-1,6-炔烃之间显着的反应性差异的原理,并通过DFT研究概述了该现象,从而为设计新的催化剂系统和方法提供了必要的见识。用于合成的应用程序。
Palladium-Catalyzed Oxidative Diarylating Carbocyclization of Enynes
作者:Min Jiang、Tuo Jiang、Jan-E. Bäckvall
DOI:10.1021/ol301551x
日期:2012.7.6
efficient palladium-catalyzedoxidativediarylatingcarbocyclization of enynes is described. The reaction tolerates a range of functionalized arylboronic acids to give diarylated products in good yields. Control experiments suggest that the reaction starts with an arylpalladation of the alkyne, followed by carbocyclization, transmetalation, and reductive elimination to afford the diarylated product.