Abstract
5H-8,9-dimethoxy-5-(2-N,N-dimethylaminoethyl)-2,3-methylenedioxydibenzo[c,h][1,6]naphthyridin-6-one exhibits potent TOP1-targeting activity and pronounced antitumor activity. It was hypothesized that replacement of the two methoxyl groups with a nitro substituent would allow for retention of similar activity. In this study 8-, 9-, and 10-nitro-5H-2,3-methylenedioxy-5-(2-N,N-dimethylaminoethyl)dibenzo[c,h][1,6]naphthyridin-6-one and their amino derivatives were synthesized and assessed for their relative TOP1-targeting activity and cytotoxicity. In the case of both the 8- and 9-nitro analogues, their TOP1-targeting activity and cytotoxicity are greater than that of camptothecin and comparable to that of 5H-8,9-dimethoxy-5-(2-N,N-dimethylaminoethyl)-2,3-methylenedioxydibenzo[c,h][1,6]naphthyridin-6-one.
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