Environmentally Friendly Protocol for 2,3-Difunctionlization of Indole Derivatives
摘要:
Environmentally friendly and highly regioselective C-3 dichlorination and C-2 oxidation of N-substituted indoles have been established using NaCI as a chlorine source and H2O as an oxygen source. A series of 3,3-dichloro-2-oxindoles were obtained in moderate to excellent yields. The gram-scale synthesis and derivatization reaction were explored. The possible mechanism for this reaction was elucidated.
Metal-free site-selective C–N bond-forming reaction of polyhalogenated pyridines and pyrimidines
作者:Lei Wang、Ning Liu、Bin Dai
DOI:10.1039/c5ra18653f
日期:——
of the pyridine ring to generate monosubstituted halogenated pyridines with high selectivities. Different halogen atoms at various positions were produced by the pyridine ring that performed well under mild conditions. Halogenated pyrimidines underwent highly selective coupling at the chloride group with a wide range of amines having broad substrate applicability and moderate to good yields. The selectivity
Access to Structurally Diverse Quinoline-Fused Heterocycles via Rhodium(III)-Catalyzed C–C/C–N Coupling of Bifunctional Substrates
作者:Songjie Yu、Yunyun Li、Xukai Zhou、He Wang、Lingheng Kong、Xingwei Li
DOI:10.1021/acs.orglett.6b01032
日期:2016.6.17
Rhodium(III)-catalyzed C–H activation of heteroarenes and functionalization with bifunctional substrates such as anthranils allows facile construction of quinoline-fused heterocycles under redox-neutral conditions. The couplings feature broad substrate scope and provide step-economical access to two classes of quinoline-fused condensed heterocycles.
Cobalt (II)-catalyzed direct C3-selective C–H acyloxylation of indoles with <i>tert</i>-butyl peresters
作者:Yuxiang Zhou、Guojun Chen、Chenglong Li、Xiaozu Liu、Peijun Liu
DOI:10.1080/00397911.2018.1524493
日期:2018.11.17
Abstract A Co(II)-catalyzed direct C3-selective C–H acyloxylation of indoles has been realized with tert-butyl peresters serving as both an acyloxy source and an oxidant. This reaction features highly C3 regioselectivity and good functional group tolerance, which provides a convenient and versatile approach to the construction of valuable 3-acyloxyindoles in moderate to excellent yields. Graphical
Cobalt(III)-Catalyzed C–C Coupling of Arenes with 7-Oxabenzonorbornadiene and 2-Vinyloxirane via C–H Activation
作者:Lingheng Kong、Songjie Yu、Guodong Tang、He Wang、Xukai Zhou、Xingwei Li
DOI:10.1021/acs.orglett.6b01806
日期:2016.8.5
Co(III)-catalyzed mildC–C couplings of arenes with strained rings such as 7-oxabenzonorbornadienes and 2-vinyloxirane have been realized. The transformation is proposed to undergo ortho C–Hactivation, olefin insertion, and subsequent β-oxygen elimination. A broad range of synthetically useful functional groups are compatible, thus providing a new entry to access diversely 2-functionalized indoles
Cobalt(III)-Catalyzed Regio- and Stereoselective α-Fluoroalkenylation of Arenes with <i>gem</i>-Difluorostyrenes
作者:Lingheng Kong、Xukai Zhou、Xingwei Li
DOI:10.1021/acs.orglett.6b03203
日期:2016.12.16
A cobalt(III)-catalyzed α-fluoroalkenylation of different arenes with readily available gem-difluorostyrenes has been realized under mild and redox-neutral conditions. This reaction occurs via a C–Hactivation pathway and offers a step-economical access to various 1,2-diaryl-substituted monofluoroalkenes in excellent Z selectivity in moderate to excellent yields.