G. Cirrincione et al., POLYCONDENSED NITROGEN-HETEROCYCLES .27. INDOLO[3,2-C]CINNOLINE - SYNTHESIS AND ANTILEUKEMIC ACTIVITY, Il Farmaco, 50(12), 1995, pp. 849-852
Indolo[3,2-c] cinnolines of type 5, variously substituted either in th
e indole and in the cinnoline moieties, were prepared in good overall
yields, by intramolecular cyclization of indolo derivatives 4. Compoun
ds 5a-d showed a good cytotoxic activity against FLC and K562 leukemic
cell lines, both sensitive and multi-drug resistant.