Compound 1 (SKI-606, bosutinib), a 7-alkoxy-4-[(2, 4-dichloro-5-methoxyphenyl) amino]-3- quinolinecarbonitrile, is a potent inhibitor of Src kinase activity. We previously reported that analogs of 1 with thiophene groups at C-7 retained the Src activity of the parent compound. The corresponding C-7 furan analogs were prepared and it was found that the 3, 5- substituted furan analog had increased activity compared to that of the 2, 5-substituted ...