期刊
TETRAHEDRON LETTERS
卷 41, 期 6, 页码 791-794出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(99)02212-1
关键词
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Vinylzirconium reagents couple with alpha-bromo-alpha,alpha-difluoro esters in the presence of a Ni(PPh3)(4) catalyst to form alkenyl difluoro esters in good yields. This reaction exemplifies a novel mode of reactivity for alpha-bromo-alpha,alpha-difluoro esters wherein the inherent electrophilicity of the carbon-bromine bond is utilized in the course of the reaction rather than being formally reduced in Reformatzsky-type reactions. The choice of ester group in the reactant is critical to the success of this reaction with the isopropyl group, formed via a novel transesterification procedure, giving the best yields. (C) 2000 Elsevier Science Ltd. All rights reserved.
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