[Br:1][C:2]1[CH:11]=[N:10][C:5]2[O:6][CH2:7][CH2:8][NH:9][C:4]=2[CH:3]=1.[Br:12][C:13]1[CH:14]=[C:15]([CH:19]=[C:20]([Br:24])[C:21]=1[O:22][CH3:23])[C:16](Cl)=[O:17].C(N(CC)CC)C.O>ClCCl>[Br:1][C:2]1[CH:11]=[N:10][C:5]2[O:6][CH2:7][CH2:8][N:9]([C:16]([C:15]3[CH:19]=[C:20]([Br:24])[C:21]([O:22][CH3:23])=[C:13]([Br:12])[CH:14]=3)=[O:17])[C:4]=2[CH:3]=1To a 10 ml flask, 7-bromo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazine (37 mg, 0.172 mmol) and 3,5-dibromo-4-methoxy-benzoyl chloride (113 mg, 0.344 mmol) were dissolved in dichloromethane (0.5 ml). Triethylamine (0.120 ml, 0.860 mmol) was added thereto and then stirred at room temperature for 1 hour. After completion of the reaction by adding water to the reaction mixture, the organic layer was extracted with dichloromethane and the combined organic layer was washed with water and saturated saline solution, dried over anhydrous sodium sulfate (Na2SO4), filtered and evaporated under reduced pressure. The residue was purified by column chromatography on silica eluting with a solvent of dichloromethane:ethyl acetate:n-hexane=1:2:5. The fractions containing the product were collected and evaporated to obtain white solid (55 mg, 63%).
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