Oxidation of both aromatic and aliphatic thiols by 5-arylidene 1,3-dimethylbarbituric acid was found to proceed readily to give disulfides in good yield with concomitant reduction of the oxidant to the dihydro compound. Thiol adduct of the dihydro compound was successfully applied to the synthesis of unsymmetricaldisulfide under mild conditions in an excellent yield.
An (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-promoted cross-coupling of thiols/diselenides and sulfoxides for the synthesis of unsymmetrical disulfides/selenosulfides
An (NH4)2S2O8-promoted cross-coupling of thiols/diselenides and sulfoxides to construct unsymmetrical disulfides/selenosulfides is disclosed. Control experiments demonstrate that (NH4)2S2O8 acts as an acid and an oxidant, while both ionic and radical routes are involved in the reaction. The KIE experiments reveal that C–H bond cleavage of sulfoxides was involved in the turnover-limiting step.
公开了一种(NH 4 ) 2 S 2 O 8促进的硫醇/二硒化物和亚砜的交叉偶联以构建不对称的二硫化物/硒硫化物。对照实验表明,(NH 4 ) 2 S 2 O 8充当酸和氧化剂,而离子和自由基途径都参与反应。KIE 实验表明,亚砜的 C-H 键断裂参与了周转限制步骤。
Ground solid permanganate oxidative coupling of thiols into symmetrical/unsymmetrical disulfides: selective and improved process
作者:Ngan-Giang Thi Nguyen、Xuan-Triet Nguyen、Ngoc-Huy Nguyen、Thi Xuan Thi Luu、Xuan-Tien Dao
DOI:10.1080/17415993.2022.2083914
日期:2022.11.2
The oxidation of thiols to the symmetrical disulfides by using ground solid potassium permanganate under mild and solvent-free conditions has allowed us to selectively oxidize thiols in the presence of other readily oxidized functional groups such as alcohol, aldehyde, amine and alkene without the risk of producing undesired products via competitive oxidation reactions. Unsymmetrical disulfides have