[F:1][C:2]1[CH:16]=[CH:15][C:5]2[C:6]([CH:9]3[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]3)=[N:7][O:8][C:4]=2[CH:3]=1.Cl[CH2:18][CH2:19][C:20]1[C:25](=[O:26])[N:24]2[CH2:27][CH2:28][CH2:29][C:30](=[O:31])[C:23]2=[N:22][C:21]=1[CH3:32].C(N(C(C)C)CC)(C)C>CO>[F:1][C:2]1[CH:16]=[CH:15][C:5]2[C:6]([CH:9]3[CH2:10][CH2:11][N:12]([CH2:18][CH2:19][C:20]4[C:25](=[O:26])[N:24]5[CH2:27][CH2:28][CH2:29][C:30](=[O:31])[C:23]5=[N:22][C:21]=4[CH3:32])[CH2:13][CH2:14]3)=[N:7][O:8][C:4]=2[CH:3]=1To the solution of 6-fluoro-3-(piperidin-4-yl)benzo[d]isoxazole (formula-8) (0.62 grams) taken in methanol added 3-(2-chloroethyl)-9-oxo-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (formula-9) (0.94 grams), diisopropyl ethyl amine (0.75 grams) and refluxed the reaction for 23 hrs. Cooled the reaction mixture to 26° C. and stirred for 15 minutes. Filtered the precipitated solid. Washed the solid with chilled methanol and dried. Separated the compound with column chromatography using chloroform/methanol as an eluent.
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