Nickel/N-Heterocyclic Carbene-Catalyzed Suzuki–Miyaura Type Cross-Coupling of Aryl Carbamates
作者:Akimichi Ohtsuki、Kousuke Yanagisawa、Takayuki Furukawa、Mamoru Tobisu、Naoto Chatani
DOI:10.1021/acs.joc.6b01627
日期:2016.10.7
N-heterocyclic carbene ligands in nickel-catalyzed Suzuki–Miyaura cross-coupling of aryl esters and carbamates is investigated. Imidazol-2-ylidene bearing 2-adamantyl groups at its nitrogen atoms generates the most active nickel species among the ligands examined, allowing cross-coupling of a range of aryl carbamates and pivalates. Unlike the previously reported system using tricyclohexylphosphine, this protocol
研究了N杂环卡宾配体在镍催化的芳基酯和氨基甲酸酯的Suzuki-Miyaura交叉偶联中的作用。在其氮原子上带有2-金刚烷基的咪唑-2-亚烷基在所考察的配体中产生活性最高的镍,从而使多种芳基氨基甲酸酯和新戊酸酯交叉偶联。与先前报道的使用三环己基膦的系统不同,该方案适用于除芳基硼酸外使用芳基硼酸酯的交叉偶联。