Organophotoredox‐Mediated Amide Synthesis by Coupling Alcohol and Amine through Aerobic Oxidation of Alcohol
作者:Sk. Sheriff Shah、Maniklal Shee、Yarra Venkatesh、Amit Kumar Singh、Samya Samanta、N. D. Pradeep Singh
DOI:10.1002/chem.201904924
日期:2020.3.23
formations. The hydrogen-bonded OH group activated the adjacent C-H bond of alcohols towards hydrogen atom transfer (HAT) by a radical species. The quinuclidinium radical cation, generated through single-electron oxidation of quinuclidine by the photocatalyst, employed to abstract a hydrogen atom from the α-C-H bond of alcohols selectively due to a polarity effect-produced α-hydroxyalkyl radical, which
有机光催化剂[4CzIPN(1,2,3,5-四(咔唑-9-基)-4,6二氰基苯)或5MeOCzBN(2,3,4,5,6-戊基(3,6- [二甲氧基-9 H-咔唑-9-基)苄腈],喹啉和磷酸四正丁铵(氢键催化剂)用于酰胺键的形成。氢键合的OH基团通过自由基将醇的相邻CH键朝着氢原子转移(HAT)活化。通过光催化剂对奎尼丁进行单电子氧化而生成的奎尼丁鎓自由基阳离子,由于极性效应产生的α-羟烷基自由基选择性地从醇的α-CH键中提取氢原子,随后转化为相应的在有氧条件下的醛。