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.
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.