Nickel-catalyzed regioselective C–H acylation of chelating arenes: a new catalytic system for C–C bond formation <i>via</i> a radical process and its mechanistic explorations
作者:Ze-lin Li、Peng-yu Wu、Kang-kang Sun、Chun Cai
DOI:10.1039/c9nj02191d
日期:——
ortho C–Hbond of chelating arenes via the Ni(II)-catalyzed cross dehydrogenative coupling strategy has been developed here. This new procedure exhibits excellent regioselectivity and good functional group tolerance. This discovery could be of great importance for the C–H acylation reactions of chelating arenes without any extraneous directing group and for the application of nickel-catalyzed C–H activation
Palladium-catalyzed ortho-acylation of 2-aryl pyridine derivatives using arylmethyl amines as new acyl sources
作者:Qian Zhang、Fan Yang、Yangjie Wu
DOI:10.1039/c3cc42106f
日期:——
A facile and efficient protocol for palladium-catalyzed ortho-acylation of 2-aryl pyridines was developed. Note that this acylation utilized arylmethyl amines as new, cheap and readily available acylation reagents and exhibited high regioselectivity for 2-aryl pyridines bearing a meta-substituent in the aryl ring moiety.
Palladium catalyzed ortho -C–H-acylation of 2-arylpyridines using phenylacetylenes and styrene epoxide
作者:Qian Zhang、Yang Wang、Tingting Yang、Li Li、Dong Li
DOI:10.1016/j.tetlet.2015.11.065
日期:2016.1
A palladium-catalyzed ortho-C-H-acylation of 2-arylpyridine using phenylacetylenes and styrene epoxide as the acylated reagents was developed. With the employment of tert-butyl hydroperoxide (TBHP) as the oxidant and a phosphorous ligand, the protocol generates corresponding aryl ketones in moderated to good yields with high regioselectivity and good functional group compatibility. (C) 2015 Elsevier Ltd. All rights reserved.