Piperidinium tetrathiotungstate has been found to react with a number of 1,n-dihalo compounds to afford the corresponding cyclic disulfides in good yields, under mild reaction conditions. This new methodology has been used as a key step in the synthesis of (+/-)-lipoic acid (35) and asparagusic acid (37).
Synthesis of cyclic disulfides using didecyldimethylammonium bromide as phase transfer catalyst
作者:Sachin U. Sonavane、Mandan Chidambaram、Sanaa Khalil、Joseph Almog、Yoel Sasson
DOI:10.1016/j.tetlet.2007.11.075
日期:2008.1
A convenient, practical and general method for the synthesis of symmetrical and unsymmetrical cyclic disulfides based on the reaction of sulfur with sodium sulfide in the presence of didecyldimethylammonium bromide (DDAB) as a phase transfer catalyst is described. (C) 2007 Published by Elsevier Ltd.