Oxidative Esterification, Thioesterification, and Amidation of Aldehydes by a Two-Component Organocatalyst System Using a Chiral N-Heterocyclic Carbene and Redox-Active Riboflavin
作者:Soichiro Iwahana、Hiroki Iida、Eiji Yashima
DOI:10.1002/chem.201100737
日期:2011.7.11
Flavin of the month! Triazolium‐derived N‐heterocyclic carbenes (NHCs) and a flavin catalyzed the oxidative esterification, thioesterification, and amidation of aldehydes with various alcohols, thiols, and amines, respectively, with O2 as the terminal oxidant (see scheme; R1=aryl; R2, R3=alkyl or aryl). By using a chiral NHC catalyst, the enantioselective acylation promoted the kinetic resolution of
本月的黄素!三唑鎓衍生的N-杂环卡宾(NHC)和黄素分别以O 2为末端氧化剂,催化醛与各种醇,硫醇和胺的氧化氧化酯化,硫代酯化和酰胺化反应(参见方案; R 1 =芳基; R 2,R 3=烷基或芳基)。通过使用手性NHC催化剂,对映选择性酰化促进了外消旋醇的动力学拆分和内消旋二醇的不对称化。