Indium-mediated cleavage of diphenyl diselenide and diphenyl disulfide: efficient one-pot synthesis of unsymmetrical diorganyl selenides, sulfides, and selenoesters
作者:Wanida Munbunjong、Eun Hwa Lee、Poonlarp Ngernmaneerat、Sung Jun Kim、Gurpinder Singh、Warinthorn Chavasiri、Doo Ok Jang
DOI:10.1016/j.tet.2009.01.072
日期:2009.3
convenient and efficient method was developed for the synthesis of alkyl phenyl selenides, sulfides, and selenoesters in one-pot reaction by using indium metal. The reaction showed the selectivity for tert-alkyl, benzylic, and allylic halides over primary and secondary alkyl halides. For the reaction of primary and secondary alkyl iodides and bromides, the yields of selenides were improved by the addition
PhSeZn-halides react under “on water” mild conditions with acid chlorides to provide a high yield route to a variety of aromatic and aliphatic phenylselenoesters.
Rongalite (R) promotes cleavage of diaryl disulfides generating chalcogenolate anions that then undergo facile acylation with anhydrides in the presence of CsF to afford thioesters (3) with good to excellent yields. By using the present protocol, 5-arylthio-5-oxopentanoic acid (4) can be facilely prepared. The important features of the methodology are broad substrate scope, simple operation, and no requirement for metal catalysts. It is noteworthy that acylations of diphenyl diselane with anhydrides are also conducted smoothly to afford selenoesters (5) in good yields under the standard conditions. (C) 2010 Elsevier Ltd. All rights reserved.
An approach to the synthesis of thioesters and selenoesters promoted by Rongalite®
Rongalite (R) promotes cleavage of diaryldisulfides generating the corresponding chalcogenolate anions that then undergo facile reaction with N-acylbenzotriazoles in the presence of K(2)CO(3) to afford thioesters in good to excellent yields. The important features of this methodology are no requirement of metal catalysts, without any expensive reagent and high yields. It is noteworthy that the reactions of diphenyl diselenide with N-acylbenzotriazoles are also conducted to afford selenoesters in good yields under the standard conditions.