An environmentally benign and highly efficient supramolecular Michael addition of thiols from the secondary side of beta-cyclodextrin to alpha,beta-unsaturated compounds at the primary side in water is described in quantitative yields; products of undesirable side reactions resulting from polymerization are not observed; the use of cyclodextrin precludes the use of either acid or base and the catalyst
Indium(I) Iodide-Promoted Cleavage of Dialkyl Disulfides and Subsequent Michael Addition of Thiolate Anions to Conjugated Carbonyl Compounds
作者:Brindaban C. Ranu、Tanmay Mandal
DOI:10.1055/s-2004-825583
日期:——
Indium(I) iodide promotes cleavage of dialkyl disulfides generating thiolate anions which then undergo facile addition to α, β -unsaturated ketones, aldehydes, carboxylic esters and nitriles under neutral conditions producing corresponding β-keto or β-cyano sulfides in high yields. There are several examples of dialkyl/diaryl disulfides and activated alkenes participating in this reaction.
Efficient Synthesis of β‐Alkyl/Arylsulfanyl Carbonyl Compounds by In‐TMSCl‐Promoted Cleavage of Dialkyl/Diaryl Disulfides and Subsequent Michael Addition
作者:Brindaban C. Ranu、Tanmay Mandal
DOI:10.1080/00397910701229859
日期:2007.5
Abstract A convenient and efficient procedure for the synthesis of β‐alkyl/arylsulfanyl carbonyl compounds has been developed by a simple one‐pot reaction of dialkyl/diaryl sulfides with α,β‐unsaturated aldehydes, ketones, carboxylic esters, and nitriles in presence of indium and trimethylsilyl chloride under sonication.
Indium(I) iodide promoted cleavage of dialkyl disulfides Application of the Michael addition of thiolate anions to conjugated carbonyl compounds and regioselective ring opening of epoxides
作者:Brindaban C Ranu、Tanmay Mandal
DOI:10.1139/v06-065
日期:2006.5.1
promotes cleavage of dialkyl disulfides generating thiolate anions that then undergo facile addition to α,β-unsaturated ketones, aldehydes, carboxylic esters, and nitriles under neutral conditions producing corresponding β-ketosulfides or β-cyanosulfides. This strategy has also been used for the regioselective nucleophilic ring opening of epoxides by thiolate anions in presence of indium(III) chloride producing
Reduction cleavage of S–S bond by Zn/Cp<sub>2</sub>TiCl<sub>2</sub>: Application for the synthesis of β-arylthiocarbonyl compounds
作者:Xiao Bo Xu、Xian Hong Yin、Yu Yang Zhu、Xin Hua Xu、Tao Luo、Yin Hui Li、Xiong Lu、Ling Ling Shao、Jian Gao Pan、Rong Hua Yang
DOI:10.3184/030823409x12592534682310
日期:2009.12
Diaryldisulfides were reduced efficiently by a Zn/Cp2TiCl2 system at room temperature in dry THF to give the corresponding nucleophilic sulfur anion–titanocene complex, followed by reaction with α, β-unsaturated esters (ketones or nitriles) to afford the corresponding β-arylthioesters(ketone or nitrile) in good yields.