A palladium-catalyzed 1,1-carbocyanation of allylcarbonate by α-quaternary α-isocyanoacetate was developed. Formation of ketenimine followed by homolysis of the CN bond and recombination of the resulting caged radical pair was proposed to account for the formation of the unusual coupling product, the β-cyano-γ,δ-unsaturated ester.
Palladium-catalyzed allylation of 2,2,2-trifluoroethyl phenyl sulfone, a potential 2,2,2-trifluoroethyl pronucleophile
作者:Wei Zhang、Yanchuan Zhao、Chuanfa Ni、Thomas Mathew、Jinbo Hu
DOI:10.1016/j.tetlet.2012.09.094
日期:2012.11
A palladium-catalyzed allylation reaction of PhSO2CH2CF3 (2) with a variety of allyl carbonates has been successfully developed for selective 2,2,2-trifluoroethylation under neutral conditions. With this method, the 1-phenylsulfonyl-2,2,2-trifluoroethyl moiety was efficiently transferred into organic compounds without the competing 13-elimination of fluoride, to afford a range of mono-allylated and di-allylated compounds. (C) 2012 Elsevier Ltd. All rights reserved.