[CH3:1][NH:2][C:3]1[S:4][C:5]([C:13](=O)[CH:14](Br)[CH3:15])=[C:6]([C:8]([O:10][CH2:11][CH3:12])=[O:9])[N:7]=1.[CH3:18][C:19]1[CH:20]=[CH:21][C:22]([NH2:25])=[N:23][CH:24]=1.C(=O)([O-])[O-].[K+].[K+]>C(#N)C.Cl.C(OCC)(=O)C>[CH2:11]([O:10][C:8]([C:6]1[N:7]=[C:3]([NH:2][CH3:1])[S:4][C:5]=1[C:13]1[N:25]=[C:22]2[CH:21]=[CH:20][C:19]([CH3:18])=[CH:24][N:23]2[C:14]=1[CH3:15])=[O:9])[CH3:12]A solution of ethyl 2-methylamino-5-(2-bromopropionyl)-4-thiazolecarboxylate (2.2 g) and 5-methyl-2-aminopyridine (2.6 g) in acetonitrile (80 ml) was refluxed for 2 hours. The reaction mixture was evaporated to afford a residue, which was dissolved in a mixture of 5% hydrochloric acid and ethyl acetate. The separated aqueous solution was adjusted to pH 8.0 with 20% potassium carbonate and extracted with ethyl acetate. The extract was washed with brine and dried over magnesium sulfate. The solvent was evaporated in vacuo to afford a crystalline residue, which was recrystallized from a mixture of ethyl acetate and diethyl ether to give 2-(4-ethoxycarbonyl-2-methylaminothiazol-5-yl)-3,6-dimethylimidazo[1,2-a]pyridine (1.3 g).
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