Selective Hydrosilylation of Esters to Aldehydes Catalysed by Iridium(III) Metallacycles through Trapping of Transient Silyl Cations
作者:Yann Corre、Vincent Rysak、Frédéric Capet、Jean-Pierre Djukic、Francine Agbossou-Niedercorn、Christophe Michon
DOI:10.1002/chem.201602867
日期:2016.9.19
The combination of an iridium(III) metallacycle and 1,3,5‐trimethoxybenzene catalyses rapidly and selectively the reduction of esters to aldehydes at room temperature with high yields through hydrosilylation followed by hydrolysis. The ester reduction involves the trapping of transient silyl cations by the 1,3,5‐trimethoxybenzene co‐catalyst, supposedly by formation of an arenium intermediate whose
铱(III)金属环与1,3,5-三甲氧基苯的组合可在室温下快速催化并选择性地将酯还原为醛,并通过氢化硅烷化和水解反应高收率。酯的还原涉及被1,3,5-三甲氧基苯助催化剂捕获瞬态甲硅烷基阳离子,据推测是由于形成了芳烃中间体,其作用已通过DFT计算得以解决。