Stereospecific and Regioselective Synthesis of <i>E</i>-Allylic Alcohols through Reductive Cross Coupling of Terminal Alkynes
作者:Austin B. Shaff、Langxuan Yang、Mitchell T. Lee、Gojko Lalic
DOI:10.1021/jacs.3c06963
日期:——
convergent method for the synthesis of allylic alcohols that involves a reductive coupling of terminal alkynes with α-chloro boronic esters. The new method affords allylic alcohols with excellent regioselectivity (anti-Markovnikov) and an E/Z ratio greater than 200:1. The reaction can be performed in the presence of a wide range of functional groups and has a substrate scope that complements the stoichiometric
我们开发了一种合成烯丙醇的收敛方法,涉及末端炔烃与 α-氯硼酸酯的还原偶联。新方法提供了具有优异区域选择性(抗马尔可夫尼科夫)和大于 200:1 的 E/Z 比的烯丙醇。该反应可以在多种官能团存在下进行,并且底物范围可补充使用烯基锂和格氏试剂进行的 α-氯硼酸酯的化学计量烯基化。该转化是立体定向的,可以稳健且高度选择性地合成手性烯丙醇。我们的研究支持涉及炔烃氢化以及烯基铜中间体与α-氯硼酸酯交叉偶联的机制。实验证据排除了交叉偶联步骤的根本机制,并且与硼酸盐中间体的形成和1,2-金属化物转变一致。