Imidazoheterocycles undergo efficient and regioselective sulfenylation with disulfides using the iodine/hydrogen peroxide system in ethanol at 25 degrees C. This green strategy tolerates a wide range of functional groups to afford diverse sulfenylated imidazoheterocycles in high yields. Moreover, the fipronil (a pesticide) skeleton can be readily attached to imidazoheterocycles using this strategy, which is significant in drug development.
DMSO–POCl3: a reagent for methylthiolation of imidazo[1,2-a]pyridines and other imidazo-fused heterocycles
作者:Shashikant M. Patil、Sarang Kulkarni、Malcolm Mascarenhas、Rajiv Sharma、S. Mohana Roopan、Abhijit Roychowdhury
DOI:10.1016/j.tet.2013.07.017
日期:2013.9
A practical and metal free method for methylthiolation of imidazo[1,2-a]pyridines and other imidazo-fused heterocycles using DMSO-POCl3 complex is reported. The reactions are carried out at room temperature that give the corresponding methylthiolated products in good to excellent yield. Further, its application to indole has been demonstrated. (C) 2013 Elsevier Ltd. All rights reserved.