[NH:1]1[CH2:6][CH2:5][O:4][C:3]2[N:7]=[CH:8][C:9]([C:11]#[N:12])=[CH:10][C:2]1=2.[Br:13][C:14]1[CH:15]=[C:16]([CH:20]=[C:21]([Br:25])[C:22]=1[O:23][CH3:24])[C:17](Cl)=[O:18]>>[Br:13][C:14]1[CH:15]=[C:16]([CH:20]=[C:21]([Br:25])[C:22]=1[O:23][CH3:24])[C:17]([N:1]1[CH2:6][CH2:5][O:4][C:3]2[N:7]=[CH:8][C:9]([C:11]#[N:12])=[CH:10][C:2]1=2)=[O:18]By the same method as in the step d) of Example 2, 2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-7-carbonitrile (7 mg, 0.043 mmol) was reacted with 3,5-dibromo-4-methoxy-benzoyl chloride (21 mg, 0.065 mmol) to obtain 1-(3,5-dibromo-4-methoxy-benzoyl)-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-7-carbonitrile as white solid (14.4 mg, 74%).
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