Iodine-Catalyzed Mono- and Disulfenylation of Indoles in PEG<sub>400</sub>
through a Facile Microwave-Assisted Process
作者:Rajjakfur Rahaman、Pranjit Barman
DOI:10.1002/ejoc.201701293
日期:2017.11.16
An iodine-catalyzed versatile green method for the synthesis of mono- and 2,3-bis-sulfenyl indoles has been presented. Various indoles can react with alkyl or aryl sodiumsulfinates using hydrogen peroxide as an oxidizing agent in PEG400 under microwave conditions. This simple method enabled the rapid synthesis of mono- and 2,3-bis-sulfenylindoles with good to excellent yields under metal free conditions
3-(Alkylsulfanyl)- and 3-(arylsulfanyl)indoles were efficiently prepared by the reaction of indoles with sodium sulfinates mediated by iodineâPPh3 in ethanol. The salient features of the present protocol are simplicity, high efficiency, non-anhydrous conditions, environmentally friendly reagents and solvent, and short reaction time.
Iodine-catalysed versatile sulfenylation of indoles with thiophenols: controllable synthesis of mono- and bis-arylthioindoles
作者:Hailei Zhang、Xiaoze Bao、Yuming Song、Jingping Qu、Baomin Wang
DOI:10.1016/j.tet.2015.09.070
日期:2015.11
A versatile method for the synthesis of mono- and bis-arylthioindoles via I2 catalysed direct oxidative sulfenylation of indoles with thiophenols (especially mercaptobenzoic acids) has been presented. This system features environmental friendliness, easy operation, and mild reaction conditions, and shows a broad functional group tolerance furnishing good to excellent yields.
Cu-catalyzed direct C-H thiolation of electron-rich arenes with arylsulfonyl hydrazides
作者:Lingjuan Chen、Ping Liu、Jianglong Wu、Bin Dai
DOI:10.1016/j.tet.2018.02.014
日期:2018.3
An efficient Cu-catalyzed direct C–H thiolation of electron-rich arenes with arylsulfonylhydrazides has been developed. Various mono(or bis)-thioether products were obtained in moderate to good yields. Mechanistic studies suggest that the reaction likely proceeds through free-radical formation including arylthio radical and sulfonyl radical, while both disulfanes and sulfonothioates are the major
Iodine-Catalyzed Regioselective Sulfenylation of Indoles with Sulfonyl Hydrazides
作者:Fu-Lai Yang、Shi-Kai Tian
DOI:10.1002/anie.201301437
日期:2013.4.26
New S in town: Sulfonylhydrazides smoothly undergo sulfenylation with indoles in the presence of 10 mol % I2 to give structurally diverse indole thioethers in moderate to excellent yields with extremely high regioselectivity. This study paves the way for the use of sulfonylhydrazides as unique sulfur electrophiles in chemical synthesis.