S-, N-, and Se-Difluoromethylation Using Sodium Chlorodifluoroacetate
作者:Vaibhav P. Mehta、Michael F. Greaney
DOI:10.1021/ol402370f
日期:2013.10.4
thiols is reported using chlorodifluoroacetate as the difluoromethylating agent. This cheap reagent undergoes smooth decarboxylation at 95 °C to afforddifluorocarbene, which can be trapped with a variety of aromatic and heteroaromatic thiols. The reaction is also effective for the difluoromethylation of heterocyclic nitrogen compounds and phenylselenol.
<i>N</i>-Tosyl-<i>S</i>-difluoromethyl-<i>S</i>-phenylsulfoximine: A New Difluoromethylation Reagent for S-, N-, and C-Nucleophiles
作者:Wei Zhang、Fei Wang、Jinbo Hu
DOI:10.1021/ol900567c
日期:2009.5.21
The first alpha-difluoromethyl sulfoximine compound, 2, was successfully prepared by using the copper(II)-catalyzed nitrene transfer reaction. Compound 2 was found to be a novel and efficient difluoromethylation reagent for transferring the CF2H group to S-, N-, and C-nucleophiles. Deuterium-labeling experiments suggest that a difluorocarbene mechanism is involved in the current difluoromethylation reactions.
Unusual difluoromethylation of 2-mercaptoazoles
作者:K.I. Petko、L.M. Yagupolskii
DOI:10.1016/s0022-1139(01)00350-5
日期:2001.5
The conditions for difluoromethylation of 2-mercaptobenzimidazoles with difluorocarbene (CHClF2 in alkaline medium) at the sulfur atom or at two reaction centres - sulfur and nitrogen or two nitrogen atoms - were found. In the similar reaction, 2-mercapto-4(5)-(4-nitrophenyl)imidazole gives the product of bis(difluoromethylation) at the sulfur and nitrogen atoms. Benzimidazoles with two fluorinated alkyl substituents at the two nitrogen atoms were prepared for the first time. The N-difluoromethyl derivative of benzothiazole-2-thione was obtained by this procedure. (C) 2001 Elsevier Science B.V. All rights reserved.