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  • Title: Synthesis and cytotoxic activity of carboxamide derivatives of benzo[b][1,6]naphthyridin-(5H)ones.
    Author: Deady LW, Rogers ML, Zhuang L, Baguley BC, Denny WA.
    Journal: Bioorg Med Chem; 2005 Feb 15; 13(4):1341-55. PubMed ID: 15670942.
    Abstract:
    A previous reaction leading to 2-substituted 6-methyl-1-oxo-1,2-dihydrobenzo[b][1,6]naphthyridine-4-carboxylic acids has been extended to encompass a broad range of 2-substituents. Derived carboxamides, particularly 4-N-[2-(dimethylamino)ethyl], were tested for growth inhibitory properties. Potent cytotoxicity against murine P388 leukemia and Lewis lung carcinoma (LLTC) was retained for compounds bearing a remarkably diverse range of 2-substituents with a number having IC50 values <10 nM. Five of the new compounds were tested in vivo against subcutaneous colon 38 tumors in mice; a single dose (1.8 mg/kg) proved curative for the 2-(4-fluorophenyl) derivative, a further increase in potency over the very effective 2-methyl analogue reported previously.
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