Synthesis and biological activities of topoisomerase I inhibitors, 6-N-amino analogues of NB-506

Bioorganic & Medicinal Chemistry Letters
1999.0

Abstract

6-N-Amino analogues of NB-506 [6-N-formylamino-12,13-dihydro-1,11-dihydroxy-13-(beta-D-glucopyranosyl) -5H-indolo[2,3-a]pyrrolo[3,4-c]carbazole-5,7(6H)-dione] (3b) were synthesized and tested with respect to topoisomerase inhibition, cytotoxicity and anticancer effects. Among them, a 1,3-dihydroxypropane analogue (J-109,404, 5t) showed more than ten times more potent anticancer activity in MKN-45 human stomach cancer cells implanted in mice than NB-506.

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