The Renaissance of an Old Problem: Highly Regioselective Carboxylation of 2-Alkynyl Bromides with Carbon Dioxide
作者:Bukeyan Miao、Gen Li、Shengming Ma
DOI:10.1002/chem.201503494
日期:2015.11.23
A steric effect‐controlled, zinc‐mediated carboxylation of different 2‐alkynyl bromides under an atmospheric pressure of CO2 has been developed by careful tuning of different reaction parameters, including the metal, solvent, temperature, and additive. 2‐Substituted 2,3‐allenoic acids were afforded from primary 2‐alkynyl bromides, whereas the carboxylation of secondary 2‐alkynyl bromides yielded 3‐alkynoic
通过仔细调节不同的反应参数(包括金属,溶剂,温度和添加剂),已开发出在CO 2大气压下,空间效应控制的锌介导的不同2-炔基溴化物的羧化反应。伯2-炔基溴化物可提供2-取代的2,3-烯丙酸,而仲2-炔基溴化物的羧化则可得到3-链炔酸,且得率较高。已经提出了观察到的区域选择性的基本原理。