Reactions of organozinc reagents with potassium bromodifluoroacetate
摘要:
A practical method for the synthesis of gem-difluorinated compounds from organozinc reagents is described. Potassium bromodifluoroacetate serves as a source of CF2-fragment, which is inserted into carbon zinc bond of organozinc reagents. The intermediate difluorinated organozinc species can be protonated, brominated or coupled with allylic electrophiles. (C) 2014 Elsevier B.V. All rights reserved.
Reactions of Difluorocarbene with Organozinc Reagents
作者:Vitalij V. Levin、Artem A. Zemtsov、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/ol400122k
日期:2013.2.15
Reactions of difluorocarbene with benzyl and alkylzinc halides leading to fluorinated organozinc species have been described. The generated α-difluorinated organozinc reagents are reasonably stable in solution and can be quenched with external electrophiles (iodine, bromine, proton), affording compounds containing the CF2 fragment.
Reactions of gem-difluoro-substituted organozinc reagents with propargyl halides
作者:A. A. Zemtsov、N. S. Kondratyev、V. V. Levin、M. I. Struchkova、A. D. Dilman
DOI:10.1007/s11172-016-1649-8
日期:2016.11
Abstractgem-Difluoro-substituted organozinc reagents undergo cross-coupling reaction with propargyl halides in the presence of catalytic amounts of copper cyanide. The reaction leads to the formation of 4,4-difluoroallenes in high yields.
Copper-Catalyzed Allylation of α,α-Difluoro-Substituted Organozinc Reagents
作者:Artem A. Zemtsov、Nikolay S. Kondratyev、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/jo4024705
日期:2014.1.17
method for the coupling of organozinc reagents, difluorocarbene, and allylic electrophiles is described. The reaction involves insertion of difluorocarbene into the carbon–zinc bond followed by copper-catalyzed allylic substitution.