A new and useful strategy to synthesize isatins from α-formyl amides has been developed via one-pot intramolecular cyclization–oxidation reaction with the present of pyridinium chlorochromate (PCC). The reaction proceeded smoothly under air and has good yields of the corresponding products. Also, this methodology has a broad substrate scope, and is operationally simple and atom economic.
A novel, efficient and environmental method for the conversion of 2-oxoaldehydes into cyanoformamides with iodosobenzene diacetate as oxidant has been developed.
已开发出一种新颖、高效且环保的方法,可将2-氧代醛转化为氰基甲酰胺,其氧化剂为双乙酸碘苯。
Copper-Catalyzed Intramolecular C−H Oxidation/Acylation of Formyl-<i>N</i>-arylformamides Leading to Indoline-2,3-diones
作者:Bo-Xiao Tang、Ren-Jie Song、Cui-Yan Wu、Yu Liu、Ming-Bo Zhou、Wen-Ting Wei、Guo-Bo Deng、Du-Lin Yin、Jin-Heng Li
DOI:10.1021/ja103426d
日期:2010.7.7
A new, efficient Cu-catalyzed intramolecular C-H oxidation/acylation method has been developed for the synthesis of substituted indoline-2,3-diones (isatins). In the presence of CuCl, and O-2, a variety of formyl-N-arylformamides underwent the tandem reaction to afford the corresponding indoline-2,3-diones in moderate to good yields. It is noteworthy that the reaction serves as the first example of transition-metal-catalyzed transformation for the preparation of indoline-2,3-diones.
Ferric(III) chloride catalyzed intramolecular cyclization of N -alkyl-2-oxo-acetanilides: a facile access to isatins
A facile strategy for the synthesis of isatins in high yield from N-alkyl-2-oxo-acetanilides has been developed via Friedel Crafts alkylation using FeCl3 as catalyst under air. This reaction proceeds through direct intramolecular addition and oxidation in one pot. Also this methodology is operationally simple, atom economical, and environment friendly. (C) 2015 Elsevier Ltd. All rights reserved.