One step synthesis of 1,3-dihydro-1-alkyl(aryl)-3-(hexafluoro-iso-propyl)-2H-imidazole-2-thiones
作者:Viacheslav A. Petrov、Will Marshall、Rebecca Dooley
DOI:10.1016/j.jfluchem.2014.05.007
日期:2014.11
The reaction of 2,2,4,4-tetrakis-(trifluoromethyl)-1,3-dithietane (1) with variety of 1-alkyl or 1-aryl-imidazoles led to the unexpected formation of 1,3-dihydro-1-alkyl(aryl)-3-(hexafluoro-iso-propyl)-2H-imidazole-2-thiones in 11-88% yield. The reaction proceeds in polar solvents such as DMF or DMSO leading to selective formation of the corresponding thiones which provide a simple one-step process for the preparation of these materials. While 1-alkylimidazoles rapidly react with I at ambient temperature, the reaction of 1-aryl- and 1-fluoralkylimidazoles requires higher temperature and longer reaction time. Substituents in the 5-position of the imidazole ring hinder the reaction, but introduction of Me- or Ph-group in the 5-position of imidazole totally blocked the formation of the corresponding thiones. (C) 2014 Elsevier B.V. All rights reserved.