Preparation of a Storable Zinc Carbenoid Species and Its Application in Cyclopropanation, Chain Extension, and [2,3]-Sigmatropic Rearrangement Reactions
作者:Arnaud Voituriez、Lucie E. Zimmer、André B. Charette
DOI:10.1021/jo902618e
日期:2010.2.19
The formation of a new phosphate carbenoid (n-BuO)2P(O)OZnCH2I and its application in organozinc-mediated reactions is described. This carbenoid undergoes very slow degradation in solution and can be stored for several weeks at −20 °C. Its reactivity was tested with many representative alkenes and was determined to be a powerful cyclopropanating reagent, giving the corresponding cyclopropanes in 72−99%
Sonochemistry of epoxyalkylhalides in the presence of a zinc–copper couple
作者:Luis A. Sarandeses、Antonio MouriñO、Jean-Louis Luche
DOI:10.1039/c39920000798
日期:——
Under sonication in aqueous ethanol, a zincâcopper couple induces the conjugated addition of epoxyalkyl groups to electron deficient alkenes in synthetically useful yields, provided that the two reducible functionalities are sufficiently far apart; 3,4-epoxyalkylhalides have been found to form cyclopropane adducts.