Cooperative catalysis by bovine serum albumin–iodine towards cascade oxidative coupling-C(sp<sup>2</sup>)–H sulfenylation of indoles/hydroxyaryls with thiophenols on water
作者:Saima Saima、Danish Equbal、Aditya G. Lavekar、Arun K. Sinha
DOI:10.1039/c6ob00930a
日期:——
economically reliable. Further, the gram scale synthesis of a COX-2 inhibitor (3-(pyridin-2-ylthio)-1H-indole), regioselectivity and recyclability (up to four cycles) are the additional merits of this cooperative cascade bio-chemocatalytic (BSA–I2) protocol. Moreover, HPLC and ESI-MS provide powerful insights into the mechanistic aspects of the above cascade sulfenylation reaction.
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
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
We describe herein a catalyst-free selective C−H sulfenylation of imidazo[1,2-a]pyridines using sulfonothioates as odorless source of thioarylated reagent in an aqueous medium. The method works for a variety of substitutedimidazo[1,2-a]pyridines with broad functional group tolerance. The methodology has been extends to selective sulfernylation of indoles and imidazothiazoles. The sulfonothioates are