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.
This protocol describes an iodine/manganese catalytic system for dehydrogenative oxidative coupling reaction of indoles with thiols in anisole. Particularly, the dual roles of anisole have been first demonstrated as a solvent and as a promoter via the formation of an oxonium ionintermediate to accelerate the generation of products. A series of sulfenylindoles are readily constructed under aerobic
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.
Domino C−S/C−N Bond Formation Using Well‐Defined Copper‐Phosphine Complex Catalyst: Divergent Approach to 3‐Sulfenylated Indoles
作者:Ramuel John Inductivo Tamargo、Sung Hong Kim、Yong Rok Lee
DOI:10.1002/adsc.201900612
日期:2019.9.3
3‐thioindoles in good‐to‐excellent yields involving sulfenylation between 2‐nitrocinnamaldehydes and various thiols using a well‐defined copper(I)‐phosphine complex catalyst. This unconventional divergent approach involves in situ generation of indoles via domino C−S/C−N bondformation initiated by sulfa‐Michael addition followed by intramolecular N‐heteroannulation. This protocol shows good chemoselectivity
GRAPHICAL ABSTRACT Abstract A simple method was developed for the synthesis of 3-chalcogen indoles via iodine-promoted direct 3-selanyl- and 3-sulfenylation of indoles with dichalcogenides. The reaction was carried out smoothly in EtOH under air at room temperature, selectively giving a series of 3-chalcogen indoles bearing different functional groups in good to excellent yields. The procedure has