Transition-Metal-Free BF<sub>3</sub>-Mediated Regioselective Direct Alkylation and Arylation of Functionalized Pyridines Using Grignard or Organozinc Reagents
作者:Quan Chen、Xavier Mollat du Jourdin、Paul Knochel
DOI:10.1021/ja401146v
日期:2013.4.3
A formal regioselective cross-coupling of various pyridines with alkyl and aryl groups can be achieved by a BF3·OEt2-mediated addition of Grignard or organozinc reagents to pyridines bearing various substituents (chloro, bromo, cyano, vinyl, phenyl, carbethoxy, nitro, etc.) followed by an oxidative aromatization mediated by chloranil. Good regioselectivity and wide functional group tolerance make this