PhI(OAc)2-mediated iminobromination for synthesis of bromomethyl cyclic imines starting from alkenyl carbonitriles and Grignard reagents
作者:Stephen Sanjaya、Shunsuke Chiba
DOI:10.1016/j.tet.2010.11.060
日期:2011.1
PhI(OAc)(2)-mediated iminobromination was developed starting from alkenyl carbonitriles and Grignard reagents. The present transformation is carried out by a sequence of nucleophilic addition of Grignard reagents to alkenyl carbonitriles to form N-H imines and their iminohalogenation by subsequent treatment with PhI(OAc)(2). (C) 2010 Elsevier Ltd. All rights reserved.
New Synthesis of 3-Fluoropyrroles
作者:Riccardo Surmont、Guido Verniest、Filip Colpaert、Gregor Macdonald、Jan Willem Thuring、Frederik Deroose、Norbert De Kimpe
DOI:10.1021/jo802272n
日期:2009.2.6
5-Alkoxymethyl-2-aryl-3-fluoro-1H-pyrroles and 2-aryl-3-fluoro-1H-pyrrole-5-carbaldehydes were efficiently prepared from the corresponding 2-aryl-5-(bromomethyl)-1-pyrrolines via electrophilic α,α-difluorination of the imino bond, using Selectfluor (1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bistetrafluoroborate) and subsequent aromatization by dehydrofluorination. This methodology provides