[H-].[Na+].[Cl:3][C:4]1[CH:5]=[C:6]([N:10]2[C:15]3[N:16]=[CH:17][CH:18]=[CH:19][C:14]=3[CH2:13][NH:12][C:11]2=[O:20])[CH:7]=[CH:8][CH:9]=1.Cl.Cl[CH2:23][C:24]1[CH:29]=[CH:28][N:27]=[CH:26][CH:25]=1>O1CCCC1>[Cl:3][C:4]1[CH:5]=[C:6]([N:10]2[C:15]3[N:16]=[CH:17][CH:18]=[CH:19][C:14]=3[CH2:13][N:12]([CH2:23][C:24]3[CH:29]=[CH:28][N:27]=[CH:26][CH:25]=3)[C:11]2=[O:20])[CH:7]=[CH:8][CH:9]=1Sodium hydride (50% dispersion in oil) (364 mg, 7.6 mmole), previously washed in hexanes, was added to a solution of 1-(3-chlorophenyl)pyrido[2,3-d]pyrimidine-2(1H,3H)-one (500 mg, 1.9 mmole) in tetrahydrofuran (100 ml). The suspension was stirred for 5 minutes at room temperature and 4-chloromethylpyridine hydrochloride was added. The suspension was refluxed for 18 hours. The solvents were removed and H2O was added to the residue. The residue was extracted twice with ethyl acetate (2×25 ml). The organic phases were combined and the solvents removed. The residue was purified with preparative thin-layer chromatography (ethyl acetate as the eluent) yielding 116 mg (0.33 mmole, 17% yield) of 1-(3-chlorophenyl)-3-(4-pyridylmethyl)pyrido[2,3-d]pyrimidine-2(1H,3H)-one (mp 132°-134° C.), as a white solid.
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