New synthesis of substituted 6-methylbenzo[b]furo-, -thieno-, and -seleno[2,3-c]quinolines, and heterocyclic analogues

Substituted 6-methylbenzo(b)furo, -thieno-, and -seleno(2,3-c)quinolines were synthetized either by thermal electrocyclisation of the 2-ethanonoximes of 3-phenyl- and 3-hetaryl-substituted benzo(b)furans, -thiophenes, and selenophene, or by treatment of the corresponding O-2,4- dinitrophenyl oximes with sodium hydride.