An efficient metal-freesulfenylation of indoles with disulfides has been developed, leading to 3-arylthioindoles in moderate to excellent yields. Furthermore, bromosulfenylation of indoles with disulfides has been realized for the first time providing a new family of 2-bromo-3-arylthioindole derivatives in good yield by the one-pot construction of CS and CBr bonds. It is noteworthy that the system
Selective sulfenylation of indoles with disulfides using iron(III) fluoride combined with iodine has been developed for the synthesis of sulfenylindoles. In the presence of iron(III) fluoride and iodine, a variety of disulfides underwent the reaction with indoles selectively to afford the corresponding sulfenylindoles in good to excellent yields. Moreover, reactions of indoles with 1,2-diphenyldiselane were also conducted under the same conditions, which smoothly afforded 3-selenylindoles in good yields.
Electrochemical Sulfenylation of Indoles with Disulfides Mediated by Potassium Iodide
作者:Chen Chen、Pengfei Niu、Zhenlu Shen、Meichao Li
DOI:10.1149/2.0071807jes
日期:——
A novel electrochemical system for sulfenylation of indoles with disulfides to generate 3-sulfenylindoles via C-S bond formation mediated by potassium iodide at a low potential was developed. Iodine was electrogenerated from iodide ions at a graphite anode and showed a high catalytic activity for the electrochemical sulfenylation reactions. A variety of aromatic, heteroaromatic and aliphatic disulfides could react with 2-methlyindole to synthesize the corresponding 3-sulfenylindoles in good to excellent yields. In addition, protected and unprotected indoles with various groups, especially electron-donating groups, also performed well in the sulfenylation reactions. The transformation, which proceeded through the redox of iodine and the generation of intermediate 3-iodoindole, provided an efficient and environmentally benign protocol for the synthesis of 3-sulfenylindoles under mild conditions. (C) 2018 The Electrochemical Society.
Silver-Mediated Sulfenylation of Indoles and Benzimidazoles with Di(hetero)aryl Disulfides
作者:Xi-Cun Wang、Wen-Juan Wang
DOI:10.3987/com-16-13641
日期:——
An efficient synthesis of novel sulfenylated N-heterocycles derivatives via AgNO3 mediated C-S coupling reaction has been developed. This reaction could be carried out under mild reaction conditions with straightforward operation and good yield. A wide range of substrates can be utilized for the C-S coupling reaction giving sulfenylated indoles and benzimidazoles, which are the importance of frameworks in medicinal and synthetic chemistry.