Acetic Acid → Methyl 2-(4-(pyridin-3-yl)benzylamino)thiazole-5-carboxylate

Beteiligte Stoffe

Reaktionsschritte

To a 250 mL round-bottomed flask was added 4-(pyridin-3-yl)benzaldehyde (4 g, 21.8 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 reaction mixture was heated at reflux under Dean-Stark conditions for 3 hours, cooled to room temperature, and the volatiles were removed by rotary evaporation. Methanol was added, the solution was cooled to 0° C., and sodium borohydride (1.322 g, 34.9 mmol) was carefully added. The reaction was stirred at 0° C. for 15 minutes and allowed to warm to room temperature while stirring for an additional 2 hour. The solids were filtered off, washed with water and dried under high vacuum to give the title compound which was used in the next step without further purification.

Herkunft & Nachweise