Direct Bis-Alkyl Thiolation for Indoles with Sulfinothioates under Pummerer-Type Conditions
作者:Peng Qi、Fang Sun、Ning Chen、Hongguang Du
DOI:10.1021/acs.joc.1c02502
日期:2022.1.21
applications. This approach enabled double C–H thiolation at the C2 and C3 of the indole in one pot. The mechanism studies suggested the thiolation was realized through the sulfoxonium salt rather than sulfenylcarboxylate.
Thiolsulfinates react with trifluoro- or trichloroacetic anhydride to give equimolar mixtures of the corresponding disulfides and sulfinyl trifluoro- or trichloroacetates which are in equilibria with sulfenyl carboxylates. Although the equilibrium lies far toward sulfinyl carboxylates at room temperature, addition of olefins to the mixed solution of sulfinyl carboxylate and a corresponding disulfide
various olefins in carbon tetrachloride afforded the corresponding β-trifluoro- or trichloroacetoxy sulfides in good yields. The β-trihaloacetoxy sulfides are considered to be resulted by the electrophilic addition of the sulfenyl trihaloacetates, formed as transient intermediates, to olefins. The addition takes place stereospecifically in trans manner and the regioselectivity for the addition with unsymmetrical
作者:Fillmore Freeman、Bao-Guo Huang、Robert I-San Lin
DOI:10.1055/s-1994-25551
日期:——
The preparation of acetyl alkyl disulfides 2, which are key intermediates for the synthesis of alkyl hydrodisulfides 1, from disulfides is described. Disulfides are oxidized to sulfinothioic acid S-esters (thiosulfinates) which thioalkylate thioacetic acid to form acetyl alkyl disulfides 2.