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Pd-Catalyzed Intramolecular Cyclization of 2-Iodoanilino Esters to Dihydroquinolin-4-ones
D. Solé*, O. Serrano
Universitat de Barcelona, Spain
23 January 2008 (online)
A palladium-catalyzed intramolecular cyclization of β-(2-iodoanilino)esters A to give dihydroquinolin-4-ones B is reported. K3PO4 along with Et3N in toluene was found to be the effective combination for the intramolecular condensation, although under these conditions small amounts of hydrodehalogenation product C were detected in some cases. Carbamate (R2 = CO2Me) and sulfonamide (R2 = Ts) failed to undergo cyclization and only gave reduced product C.