作者:Tamal Roy、Myungjo J. Kim、Yang Yang、Suyeon Kim、Gyumin Kang、Xinyi Ren、Anders Kadziola、Hee-Yoon Lee、Mu-Hyun Baik、Ji-Woong Lee
DOI:10.1021/acscatal.9b01087
日期:2019.7.5
We report a Michael-type cyanation reaction of coumarins by using CO2 as a catalyst. The delivery of the nucleophilic cyanide was realized by catalytic amounts of CO2, which forms cyanoformate and bicarbonate in the presence of water. Under ambient conditions, CO2-catalyzed reactions afforded high chemo- and diastereoselectivity of beta-nitrile carbonyls, whereas only low reactivities were observed under argon or N-2. Computational and experimental data suggest the catalytic role of CO2, which functions as a Lewis acid, and a protecting group to mask the reactivity of the product, suppressing byproducts and polymerization. The utility of this convenient method was demonstrated by preparing biologically relevant heterocyclic compounds with ease.