反应详情

温度

110 °C

To a manually stirred polyphosphoric acid (80 g, 800 mmol) in a 1000 mL beaker was added 4-methyl-1,3-thiazol-2-amine (Aldrich, 16 g, 140 mmol), followed by methyl 4-bromo-3-oxopentanoate (34.9 g, 167 mmol). The mixture was heated with stirring at 110° C. for 5 h. After cooling, the dark slurry was transferred into 300 g of ice. The pH of the mixture was adjust to 6-7 with 10% sodium hydroxide. The aqueous layer was discarded and the dark oil layer was diluted with methylene chloride and washed with 1 N NaOH, brine, dried over magnesium sulfate, and evaporated to dryness to yield the desired product (16.2 g, 42.6%). LCMS calculated for C9H10BrN2OS (M+H)+: m/z=273.0. Found: 273.1.

1. temperatureThe mixture was heated
2. temperatureAfter cooling
3. washwashed with 1 N NaOH, brine
4. dry with materialdried over magnesium sulfate
5. customevaporated to dryness