[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[CH:14]=[CH:13][C:10]([CH:11]=O)=[CH:9][CH:8]=2)[CH:2]=1.[NH2:15][C:16]1[S:17][C:18]([C:21]([O:23][CH3:24])=[O:22])=[CH:19][N:20]=1.C(O)(=O)C.[BH4-].[Na+]>C1(C)C=CC=CC=1>[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[CH:14]=[CH:13][C:10]([CH2:11][NH:15][C:16]3[S:17][C:18]([C:21]([O:23][CH3:24])=[O:22])=[CH:19][N:20]=3)=[CH:9][CH:8]=2)[CH:2]=1In a 250 mL round-bottomed flask was added 4-(pyridin-3-yl)benzaldehyde (4 g, 21.83 mmol), methyl 2-aminothiazole-5-carboxylate (3.45 g, 21.83 mmol), and acetic acid (0.375 ml, 6.55 mmol) in toluene (109 ml). The mixture was heated at reflux under Dean-Stark conditions for 3 hours, cooled, concentrated and redissolved in methanol. The mixture was cooled to 0° C. and sodium borohydride (1.322 g, 34.9 mmol) was carefully added. The mixture was warmed to room temperature and the resulting suspension was filtered with water washes to provide the title compound after drying.
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