A lactam-derived vinyl boronate as a stable and crystalline reagent for the synthesis of 2-substituted piperidines by Pd-catalyzed coupling reactions
作者:Alessandro Ferrali、Antonio Guarna、Fabrizio Lo Galbo、Ernesto G. Occhiato
DOI:10.1016/j.tetlet.2004.05.015
日期:2004.6
A delta-valerolactam-derived vinyl triflate has been converted into the corresponding vinyl boronate by Pd-catalyzed coupling with bis(pinacolato)diboron, which results in all umpolung. This boronate efficiently couples under Pd catalysis with aryl and heteroaryl bromides to give the corresponding 2-substituted piperidines ill excellent yields. (C) 2004 Elsevier Ltd. All rights reserved.