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
A combined experimental/theoretical investigation on the D-Glucosamine promoted sulfenylation of indoles at the C3 position with sodium sulfinates catalyzed by copper is presented. The C3-sulfenylation of indoles shows good functional-group tolerance and yield. The 3-I-indole was identified as a crucial intermediate in the catalytic cycle. The catalytic role of [Cu(DMSO)2]2+ was addressed using quantum
An efficient and convenient method was developed for the preparation of 3-sulfenylindoles via a K2CO3 promoted direct sulfenylation of indoles with disulfides. The method is applicable to a wide range of indoles containing different functional groups furnishing good to excellent yields. This synthetic strategy features environmental friendliness, easy operation, and mild reaction conditions.
Iodine-Catalyzed Regioselective Sulfenylation of Indoles with Sodium Sulfinates
作者:Fuhong Xiao、Hao Xie、Saiwen Liu、Guo-Jun Deng
DOI:10.1002/adsc.201300773
日期:2014.2.10
AbstractAn iodine‐catalyzed sulfenylation of free indoles with sodium sulfinates is described. The reaction selectively afforded 3‐arylthioindoles in good to high yields in anisole under metal‐free conditions. Functional groups such as halogens were well tolerated under the optimized reaction conditions.magnified image
Microwave-assisted regioselective sulfenylation of indoles under solvent- and metal-free conditions
Herein, we report a solvent- and metal-free methodology for the sulfenylation of indoles with sulfinic acids in the absence of an external catalyst under microwave irradiation. This environmentally friendly approach offered the desired products in moderate to excellent yields in only 10 min. Several functional group tolerances were monitored under the optimized conditions.