A base-free rhodium-catalyzed Mizoroki-Heck (M-H) reaction using potassium aryltrifluoroborates as the arylating agent of alkenes and acetone as a green '' oxidant '' is described. Thanks to the ready availability of organoboranes, this reaction should constitute an interesting alternative to conventional M-H reactions using aryl halides.
Palladium(II) mediated aziridination of olefins with bromamine-T as the nitrogen source: scope and mechanism
作者:Alexandra M.M. Antunes、Vasco D.B. Bonifácio、Susana C.C. Nascimento、Ana M. Lobo、Paula S. Branco、Sundaresan Prabhakar
DOI:10.1016/j.tet.2007.05.020
日期:2007.7
The palladium(II)-promoted reaction of a variety of olefins and bromamine-T provided N-tosyl-2-substituted aziridines under mild conditions. Olefins bearing chiral appendages gave only a poor to modest diastereoselectivity. Appropriate deuterated olefins were selected to study the stereochemistry of the reaction. A Pd(IV) intermediate is proposed as the aziridinating species. (C) 2007 Elsevier Ltd. All rights reserved.