Pd(II) complexes of monodentate deoxycholic acid derived binaphthyl diamido phosphites as chiral catalysts in the asymmetric Suzuki-Miyaura cross-coupling
Chiral binaphthyl diamidophosphites derived from deoxycholic acid were synthesized and used as ligands for the preparation of mononuclear Pd(II) complexes, which were employed as catalysts in the asymmetric Suzuki-Miyaura cross-coupling of arylboronic acids with aryl bromides. Among the different reaction parameters, the substrate concentration emerged as being crucial for the outcome of the reaction: the reaction was faster in a concentrated reaction mixture, and could be performed at 0 degrees C, where the reaction promoted by the Pd-complexes was more enantioselective affording cross-coupling products with ee up to 70%. (C) 2017 Elsevier Ltd. All rights reserved.
Deoxycholic acid derived monophosphites as chiral ligands in the asymmetric Suzuki–Miyaura cross-coupling
作者:Varsha R. Jumde、Anna Iuliano
DOI:10.1016/j.tetasy.2011.12.006
日期:2011.12
Biaryl phosphites derived from deoxycholic acid were used as chiral ligands in the asymmetric Suzuki-Miyaura cross-coupling of arylboronic acids with aryl bromides. Amongst the different reaction parameters, the role of the base emerged as being crucial for the outcome of the reaction: the choice of base, and its amount, allowed enantiomerically enriched biaryl derivatives to be obtained at 1% catalyst loading and with an L:Pd ratio of 1:1. (C) 2011 Elsevier Ltd. All rights reserved.