We describe a direct construction of all-carbon quaternary centers from secondary C(sp3)–H substrates through a dehydrogenativecross-couplingreaction. Using FeCl2·4H2O as the catalyst and employing air (molecular oxygen) as the terminal oxidant, the cross-coupling of indolin-2-ones with indoles proceeded smoothly under mild, ligand-free and base-free conditions, providing 3,3-disubstituted oxindoles
HFIP-promoted catalyst-free cascade reactions for the synthesis of biologically relevant 3,3-di(indolyl)indolin-2-ones from indoles and isatins
作者:Xiaohan Yuan、Shuai Wang、Jialing Cheng、Bin Yu、Hong-Min Liu
DOI:10.1016/j.cclet.2020.03.025
日期:2020.9
The first HFIP-promoted catalyst-free cascadereactions for the synthesis of biologically relevant 3,3-di(indolyl)indolin-2-ones (27 examples, up to 98% yield) from readily available indoles and isatin derivatives are described. This protocol shows well tolerance of different functional groups and features extremely mild reaction conditions such as short reaction time (∼ 1 h), no usage of catalyst, easy
Facile synthesis of 3,3-di(heteroaryl)indolin-2-one derivatives catalyzed by ceric ammonium nitrate (CAN) under ultrasound irradiation
作者:Shun-Yi Wang、Shun-Jun Ji
DOI:10.1016/j.tet.2005.11.011
日期:2006.2
Ceric ammonium nitrate efficiently catalyzes the reaction of isatin with indoles under sonic waves to afford symmetrical 3,3-di(indolyl)indolin-2-ones in excellent yields, as well as the reaction of 3-hydroxy-3-indolylindolin-2-ones with indoles, pyrrole to afford the corresponding adducts in excellent yields, which provides an efficient route to the synthesis of symmetrical and unsymmetrical 3,3-
MCM-41-Accelerated PWA Catalysis of Friedel-Crafts Reaction of Indoles and Isatins
作者:Liuzhuang Xing、YongHai Hui、Jinghui Yang、Xuejian Xing、Yadong Hou、Yang Wu、Kui Fan、Wei Wang
DOI:10.1155/2018/2785067
日期:——
catalysis concept. Here we report an efficient Friedel-Craftsreaction of indoles with isatins catalyzed by PWA/MCM-41, which got the di(indolyl)indolin-2-ones derivatives with high yield. Moreover, the catalysts were characterized by XRD and SEM/EDS, the EDS spectrum indicated that the catalyst used in this reaction also contains tungsten, and the proposed mechanism for the synthesis of 3,3-di(indolyl)indolin-2-ones
Graphene oxide-catalysed carbene-transfer reaction in water: a highly “green” and selective approach to access 3,3′,3′′-trisindoles
作者:Priya Kamboj、Vikas Tyagi
DOI:10.1039/d3gc03966h
日期:——
using 3-diazo oxindole as a carbene precursor reacting with indoles to furnish biologically important 3,3′,3′′-trisindoles. The generality and robustness of the developed protocol was shown by employing different types of substitutions at the 3-diazo oxindole and indole which, in turn, provided 3,3′,3′′-trisindoles derivatives in good-to-excellent yield (61–91%). We revealed the utility of the developed