Br[CH:2]([CH3:18])[C:3]([C:5]1[CH:6]=[CH:7][C:8]2[O:13][CH:12]([CH2:14][CH3:15])[C:11](=[O:16])[NH:10][C:9]=2[CH:17]=1)=O.[NH2:19][C:20]1[CH:25]=[C:24]([CH3:26])[CH:23]=[CH:22][N:21]=1>>[CH3:18][C:2]1[N:21]2[CH:22]=[CH:23][C:24]([CH3:26])=[CH:25][C:20]2=[N:19][C:3]=1[C:5]1[CH:6]=[CH:7][C:8]2[O:13][CH:12]([CH2:14][CH3:15])[C:11](=[O:16])[NH:10][C:9]=2[CH:17]=16-(3,7-Dimethylimidazo[1,2-a]pyridin-2-yl)-2-ethyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine (0.82 g) was prepared in substantially the same manner as that of Example 16 from 6-(2-bromopropionyl)-2-ethyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine (3.12 g) and 2-amino-4-methylpyridine (3.24 g). mp. 194°-195° C (dec.).
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