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
the direct synthesis of 3-sulfanylindoles from indoles and thiols under an atmospheric pressure of molecular oxygen as a reoxidant. For example, the reaction of 2-phenylindole with benzenethiol in the presence of a catalytic amount of VO(acac)2, potassium iodide, and 2,6-di-tert-butyl-p-cresol in chlorobenzene under molecular oxygen proceeds to afford 2-phenyl-3-(phenylsulfanyl)indole in 86% yield
The direct 3-arylthiolation of indoles with aromatic thiols has been achieved in the presence of Selectfluor™ under mild conditions to produce 3-arylthioindoles in relatively good to excellent yields and with high selectivity. This method is effective even with 2-unsubstituted indoles.
An efficient metal-free C–H sulfenylation process at the C2 position of non-protected indoles has been developed.
一种高效的无金属C-H砜基化过程已经在非保护吲哚的C2位置上开发出来。
Synergistic Dual Role of [hmim]Br-ArSO<sub>2</sub>Cl in Cascade Sulfenylation–Halogenation of Indole: Mechanistic Insight into Regioselective C–S and C–S/C–X (X = Cl and Br) Bond Formation in One Pot
作者:Danish Equbal、Richa Singh、Saima、Aditya G. Lavekar、Arun K. Sinha
DOI:10.1021/acs.joc.8b03097
日期:2019.3.1
indole at room temperature, while heating the reaction mixture at 50 °C provided an unexpected 2-halo-3-arylthio indole with construction of C–S and C–S/C–X (X = Cl and Br) bonds without addition of any external halogenating agent via cascade sulfenylation–halogenation reactions under metal-oxidant-base-free conditions. Further, insight into the reaction mechanism provides an unprecedented observation