metal‐free aerobic oxidative cross‐coupling reaction between a benzylic C(sp3)–H bond and a carboxylic acidcatalyzed by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone and tert‐butyl nitrite has been developed. This protocol provides a mild and efficient route to obtain diarylmethanol esters and phthalides. It can be regarded as a typical example of green chemistry in oxidative C–O coupling.
DDQ-Catalyzed Oxidative CO Coupling Of sp<sup>3</sup>CH Bonds With Carboxylic Acids
作者:Hong Yi、Qiang Liu、Jie Liu、Ziqi Zeng、Yuhong Yang、Aiwen Lei
DOI:10.1002/cssc.201200458
日期:2012.11
catalytic amounts of DDQ combined with MnO2 as oxidant, an efficient oxidative CO coupling of benzylic sp3 CH bonds with carboxylic acids affords a series of carboxylic esters in 70–98 % yields. A wide range of functional groups and various carboxylic acids are tolerated. The reaction involves both CH functionalization and CO bond formation.