Ar. Katritzky et al., SYNTHESIS OF 5,6-DIHYDRO-4H-PYRIDO[3,2,1-JK] CARBAZOLES VIA INTERMOLECULAR [4+2]CYCLOADDITION, Tetrahedron letters, 38(40), 1997, pp. 6959-6960
4-, 4,5- and 4,6-Substituted 5,6-dihydro-4H-pyrido[3,2,1-jk]carbazoles
are synthesized regioselectively from carbazole by a novel, two step
sequence. (C) 1997 Elsevier Science Ltd.