[NH:1]1[CH2:6][CH2:5][O:4][C:3]2[CH:7]=[N:8][CH:9]=[CH:10][C:2]1=2.[Cl:11][C:12]1[CH:13]=[C:14]([CH:18]=[CH:19][C:20]=1[O:21][CH3:22])[C:15](Cl)=[O:16].C(N(CC)CC)C.Cl>ClCCl>[Cl:11][C:12]1[CH:13]=[C:14]([C:15]([N:1]2[CH2:6][CH2:5][O:4][C:3]3[CH:7]=[N:8][CH:9]=[CH:10][C:2]2=3)=[O:16])[CH:18]=[CH:19][C:20]=1[O:21][CH3:22]In a 10 ml flask, 2,3-dihydro-1H-pyrido[3,4-b][1,4]oxazine (60 mg, 0.441 mmol) and 3-chloro-4-methoxy-benzoyl chloride (108 mg, 0.529 mmol) were dissolved in dichloromethane (3 ml). Triethylamine (0.12 ml, 0.881 mmol) was added thereto and then stirred at room temperature for 2 hours. After neutralizing with 1N hydrochloric acid solution, the mixture was extracted with dichloromethane, and the combined organic layer was 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 ethyl acetate:n-hexane=1:1. The fractions containing the product were collected and evaporated to obtain white solid (134 mg, 99.8%).
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