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Boschelli, D H; Wu, Z; Klutchko, S R; Showalter, H D; Hamby, J M; Lu, G H; Major, T C; Dahring, T K; Batley, B; Panek, R L; Keiser, J; Hartl, B G; Kraker, A J; Klohs, W D; Roberts, B J; Patmore, S; Elliott, W L; Steinkampf, R; Bradford, L A; Hallak, H; Doherty, A M
Journal of medicinal chemistry, 10/1998, Letnik: 41, Številka: 22Journal Article
Screening of a compound library led to the identification of 2-amino-6-(2,6-dichlorophenyl)-8-methylpyrido2,3-dpyrimidine (1) as a inhibitor of the platelet-derived growth factor receptor (PDGFr), fibroblast growth factor receptor (FGFr), and c-src tyrosine kinases (TKs). Replacement of the primary amino group at C-2 of 1 with a 4-(N,N-diethylaminoethoxy)phenylamino group yielded 2a, which had greatly increased activity against all three TKs. In the present work, variation of the aromatic group at C-6 and of the alkyl group at N-8 of the pyrido2,3-dpyrimidine core provided several analogues that retained potency, including derivatives that were biased toward inhibition of the TK activity of PDGFr. Analogues of 2a with a 3-thiophene or an unsubstituted phenyl group at C-6 were the most potent inhibitors. Compound 54, which had IC50 values of 31, 88, and 31 nM against PDGFr, FGFr, and c-src TK activity, respectively, was active in a variety of PDGF-dependent cellular assays and blocked the in vivo growth of three PDGF-dependent tumor lines.
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