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.
A method which avoids metal and halogen for the synthesis of 3-arylthioindoles from indoles and diaryl disulfides using ammonium persulfate in methanol has been presented. Moreover, double C–H sulfenylation of indoles at 2 and 3-positions has also been achieved using iodine and ammonium persulfate.
Flavin–iodine coupled organocatalysis for the aerobic oxidative direct sulfenylation of indoles with thiols under mild conditions
作者:Ryoma Ohkado、Tatsuro Ishikawa、Hiroki Iida
DOI:10.1039/c8gc00117k
日期:——
A unique coupled redox organocatalysis system using flavin and iodine catalysts efficiently promoted the metal-free aerobic oxidative direct sulfenylation of indoles with thiols at ambient temperature without any sacrificial reagents, except environmentally benign molecular oxygen. Biomimetic flavin catalysis plays multiple roles in aerobic oxidative transformations, not only regenerating I2 from in
The C-3 sulfenylation reaction of indoles has been achieved under mild reaction conditions by simply employing NaOH as promoter and thiols as thiolating reagents. This simple method allows for easy and rapid synthesis of various 3-sulfenylated indoles with generally good to excellent yields. Primary attempts in scale-up synthesis give satisfactory result.
Iodine-catalyzed Direct Thiolation of Indoles with Thiols Leading to 3-Thioindoles Using Air as the Oxidant
作者:Xiaoxia Liu、Huanhuan Cui、Daoshan Yang、Shicui Dai、Guoqin Zhang、Wei Wei、Hua Wang
DOI:10.1007/s10562-016-1798-2
日期:2016.9
A simple and convenient method has been developed for the construction of 3-thioindoles via molecular iodine-catalyzed direct thiolation of indoles with thiols. The present protocol, which employs thiols as the thiolating agents, inexpensive molecular iodine as the catalyst, and environmentally benign air as the oxidant, allows the regioselective generation of 3-thioindoles in good to excellent yields