1. N-bromosuccinimide (19.6 g, 0.11 mol) was slowly added to a water/dioxane (1:1, 100 mL) solution of ethyl 3-ethoxyacrylate (14.4 g, 0.1 mol) at -10 °C. 2. The reaction mixture was stirred at room temperature for 1 h. 3. After the addition of thiourea (7.6 g, 0.1 mol), the reaction mixture was was heated to 80 °C and maintained for 1 h. 4. Upon completion of the reaction, the solution was cooled to room temperature followed by the addition of ammonia (20 mL). 5. The resulting paste was stirred at room temperature for 10 min and then filtered. 6. The filter cake was washed with water and dried under vacuum to give the final product, ethyl 2-aminothiazole-5-carboxylate (12.1 g, 70% yield).
