Palladium-Catalyzed<i>ortho</i>-Aroylation of 2-Arylbenzothiazoles and 2-Arylbenzoxazoles with Aldehydes
作者:Arghya Banerjee、Sourav Kumar Santra、Srimanta Guin、Saroj Kumar Rout、Bhisma K. Patel
DOI:10.1002/ejoc.201201503
日期:2013.3
protocol for the ortho-aroylation of 2-arylbenzothiazoles and 2-arylbenzoxazoles has been developed using aldehydes as the aroyl source. This Pd-catalyzed substrate-directed sp2-hybridized C–H bond functionalization occurs in the presence of the oxidant tert-butyl hydroperoxide. A variety of functional groups on the 2-arylbenzothiazoles, 2-arylbenzoxazoles, and aldehydes are tolerated under the reaction
Palladium-catalyzed oxidative ortho-acylation of 2-arylbenzoxazoles and 2-arylbenzothiazoles with toluene derivatives
作者:Yong Zheng、Wei-Bin Song、Shu-Wei Zhang、Li-Jiang Xuan
DOI:10.1016/j.tet.2015.01.025
日期:2015.3
A palladium-catalyzed oxidative ortho-acylation of 2-arylbenzoxazoles and 2-arylbenzothiazoles using TBHP as oxidant was developed, in which readily available toluene derivatives were used as the in situ generated acyl sources. This reaction afforded the desired products in moderate to good yields, and exhibited excellent regioselectivity. The plausible mechanism was also proposed.