Copper(II)-Catalyzed Ortho-Acyloxylation of the 2-Arylpyridines sp2 C−H Bonds with Anhydrides, Using O2 as Terminal Oxidant
摘要:
A chelation-assisted copper(II)-catalyzed ortho-acyloxylation of the 2-arylpyridine sp(2) C-H bond with anhydride is described. The procedure tolerates various functional groups, such as carbomethoxyl, methoxyl fluoro, bromo, chloro, and cyano groups, affording the mono- or diacyloxylated products in moderate to good yields. Importantly, this procedure uses O-2 as a clean terminal oxidant.
Palladium catalyzed ortho-C–H-benzoxylation of 2-arylpyridines using iodobenzene dibenzoates
作者:Qian Zhang、Ying Wang、Tingting Yang、Li Li、Dong Li
DOI:10.1016/j.tetlet.2015.09.097
日期:2015.10
A palladium-catalyzed ortho-C-H-benzoxylation of 2-arylpyridines using iodobenzene dibenzoates has been developed. The reaction employed the stable and easily accessible hypervalent iodine reagents as both benzoxylate source and oxidant which made the protocol simple and facile. It showed high regioselectivity and good functional group tolerance, and gave the mono-benzoxylation products in moderate to excellent yields. (C) 2015 Elsevier Ltd. All rights reserved.
Copper(II)-Catalyzed Ortho-Acyloxylation of the 2-Arylpyridines sp<sup>2</sup> C−H Bonds with Anhydrides, Using O<sub>2</sub> as Terminal Oxidant
作者:Wenhui Wang、Fang Luo、Shouhui Zhang、Jiang Cheng
DOI:10.1021/jo1000719
日期:2010.4.2
A chelation-assisted copper(II)-catalyzed ortho-acyloxylation of the 2-arylpyridine sp(2) C-H bond with anhydride is described. The procedure tolerates various functional groups, such as carbomethoxyl, methoxyl fluoro, bromo, chloro, and cyano groups, affording the mono- or diacyloxylated products in moderate to good yields. Importantly, this procedure uses O-2 as a clean terminal oxidant.