Unusual C-6 Lithiation of 2-Chloropyridine-Mediated by BuLi−Me<sub>2</sub>N(CH<sub>2</sub>)<sub>2</sub>OLi. New Access to 6-Functional-2-chloropyridines and Chloro-bis-heterocycles
作者:Sabine Choppin、Philippe Gros、Yves Fort
DOI:10.1021/ol005538o
日期:2000.3.1
the loss of chlorine atom while exclusive directed ortho metalation is obtained using LDA. Herein it is shown that the BuLi-Me(2)N(CH(2))(2)OLi (BuLi-LiDMAE) superbase promotes an unprecedented regioselective C-6 lithiation. The method was successfully applied to the preparation of potentially useful chlorinated pyridinic and bis-heterocyclic synthons.