Ti-Catalyzed Radical Alkylation of Secondary and Tertiary Alkyl Chlorides Using Michael Acceptors
作者:Xiangyu Wu、Wei Hao、Ke-Yin Ye、Binyang Jiang、Gisselle Pombar、Zhidong Song、Song Lin
DOI:10.1021/jacs.8b08605
日期:2018.11.7
Alkylchlorides are common functional groups in synthetic organic chemistry. However, the engagement of unactivated alkylchlorides, especially tertiaryalkylchlorides, in transition-metal-catalyzed C-C bond formation remains challenging. Herein, we describe the development of a TiIII-catalyzed radical addition of 2° and 3° alkylchlorides to electron-deficient alkenes. Mechanistic data are consistent
decarboxylative conjugated addition of glyoxylic acid acetals with various Michael acceptors, including unsaturated amide, ester, aldehyde, ketone, and nitrile under irradiation. Vinyl pyridine and -aryl styrene are also suitable substrates. The reaction offers various types of acetal products, which are of synthetic significance as protected aldehydes.