Palladium-catalyzed ortho-acylation of 2-arylbenzoxazoles and 2-arylbenzothiazoles using arylmethyl alcohols as the acyl source
作者:Qian Zhang、Fan Yang、Yangjie Wu
DOI:10.1016/j.tet.2013.04.052
日期:2013.6
A facile and efficient way for the synthesis of the acylated 2-arylbenzoxazoles and 2-arylbenzothiazoles by heterocycle-directed ortho-acylation was developed. This reaction was performed in chlorobenzene, using arylmethyl alcohols and tert-butyl hydroperoxide (TBHP) as the easily accessible acyl source and the oxidant, respectively, affording the desired products in moderate to good yields.
An efficient palladium-catalysed protocol for direct C–H bond acylation by cross coupling of 2-arylbenzo[d]thiazoles and aldehydes using tert-butyl hydroperoxide as the oxidant is reported. The process provides a useful method for the synthesis of aromatic ketones directly from aldehydes. In addition, the reaction can tolerate various functional groups in good yield with high regioselectivity.
An efficient protocol was developed for Pd-catalyzed direct C H bond acylation by cross-dehydrogenative-coupling of arylbenzothiazoles and benzylic alcohols using tert-butyl hydroperoxide (TBHP) as the oxidant. The acylation reactions exhibit good reactivities and excellent regioselectivity. (C) 2013 Elsevier Ltd. All rights reserved.