Catalytic dehydrocyclization of azomethines. Synthesis of substituted indoles and 4(5)-azaindoles

Catalytic dehydrocydization of azomethines obtained by condensation of p-toluidine and also 3(4)-aminopyridines with methyl aryl ketones leads to substituted indoles and pyrrolopyridine isomers with the nitrogen atom at different positions in the six-membered ring in 20-40% yield. ©1996 Plenum Publishing Corporation.