3-dimethylaminopropyl substituent on the quinolone nitrogen (3b, 3c-f, 3h) showed higher antitumor activity than compounds bearing the same substituent on the amidic nitrogen (7a and 7b). The compound 3h, which has a 3-dimethylaminopropyl substituent on the quinolone nitrogen and a methoxycarbonyl substituent at position 9, had marked antitumor activity. Because of strong cytotoxic effect of compound 4 on melanoma
Novel Cyano- and <i>N</i>-Isopropylamidino-Substituted Derivatives of Benzo[<i>b</i>]thiophene-2-carboxanilides and Benzo[<i>b</i>]thieno[2,3-<i>c</i>]quinolones: Synthesis, Photochemical Synthesis, Crystal Structure Determination, and Antitumor Evaluation. 2
Derivatives of 3-chlorobenzo[b]thiophene-2-carboxanilides and their "cyclic" analogues benzo[b]thieno[2,3-c]quinolones were synthesized. Spectroscopic study of the interactions of some representatives of "cyclic" derivatives and their "acyclic" precursors with ds-DNA/RNA supported strong intercalative binding of the former and weak nonintercalative binding of the latter group of compounds. All tested