C(=O)(O)[O-].[Na+].[NH2:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][N:8]=1.Br[CH2:14][C:15]([C:17]1[CH:22]=[CH:21][C:20]([O:23][CH3:24])=[CH:19][CH:18]=1)=O.O>C(O)C>[CH3:24][O:23][C:20]1[CH:21]=[CH:22][C:17]([C:15]2[N:6]=[C:7]3[CH:12]=[CH:11][CH:10]=[CH:9][N:8]3[CH:14]=2)=[CH:18][CH:19]=1A mixture of 25.2 g. of sodium bicarbonate, 12.3 g. of 2-aminopyridine and 30 g. of α-bromo-p-methoxyacetophenone in 100 ml. of water and 550 ml. of absolute ethanol is heated at reflux temperatures for 1.5 hrs. The reaction mixture is concentrated under reduced pressure to a yellow solid, which is partitioned between chloroform and water. The organic layer is separated, dried over sodium sulfate. Removal of the chloroform in vacuo leaves the crude intermediate as a yellow solid. Recrystallization from ethanolwater give 15.2 g. of the desired material, m.p. 131-134° C.
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