Alkylation of thiols with trichloroacetimidates under neutral conditions
摘要:
Trichloroacetimidates are displaced with thiols to form the corresponding sulfides without the need for an added acid or base by simply heating the reactants in refluxing THF. This operationally simple procedure provides the corresponding sulfides in excellent yields with only the formation of the neutral trichloroacetamide as the side product. The imidate may also be formed in situ, allowing for a direct method for the formation of sulfides from alcohols. This reaction provides a general method for the synthesis of a variety of sulfides from inexpensive and readily available alcohol starting materials. (C) 2014 Elsevier Ltd. All rights reserved.
Allylic sulfides were synthesized from allylic alcohols 1 using S, S'-bis(1-phenyl-1H-tetrazol-5-yl) dithiocarbonate (2) by means of a single-step reaction. The allylic sulfides were coupled with a Grignard reagent or carbanion in the presence of a catalytic amount of copper(I) bromide or palladium(0).