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.
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
GRAPHICAL ABSTRACT Abstract This paper reports a palladium-catalyzed C-S coupling of arylsulfinate metal salts and alkanethiols via liberation of sulfur dioxide. The use of PdCl2 as the catalyst in combination with AgNO3 as the oxidant under microwave irradiation results in the synthetically and biologically important aryl alkyl sulfides. A variety of arylsulfinate metal salts, such as sodium, potassium
Synthesis of Sulfoximines through Selective Sulfur Alkylation of in situ Generated Sulfinamide from β-Sulfoximine Esters
作者:Min Han、Lanxin Luo、Zhuo Tang、Guang-xun Li、Qiwei Wang
DOI:10.1055/a-2063-4992
日期:——
increase has led to a range of useful strategies for installing a S(VI) functionality into complex organic molecules. Conventional synthetic methods for forming α-substituted sulfonimidoyl motifs rely on late-stage modifications at sulfur and involve multistep routes. We report the development of an efficient and generalmethod for the synthesis of various α-arylated sulfoximines through a selective S-alkylation