反应详情

A mixture of 2-amino-5-chloro-2-methyl-thiazole (Matsuo, Masaaki; Ogino, Takashi; Igari, Norihiro; Seno, Hachiro; Shimomura, Kyoichi, EP 412404) (150 mg, 0.81 mmol), 2,2,3,3-tetramethylcyclopropanecarbonyl chloride (143 mg, 0.89 mmol), 4-dimethylaminopyridine (50.0 mg, 0.41 mmol) and triethylamine (226 μL, 1.62 mmol) in 15 mL of THF heated at reflux for 48 hours. The mixture was cooled to ambient temperature, diluted with EtOAc and washed with brine. The layers were separated and the aqueous phase was extracted with EtOAc (2×). The combined organic extracts were dried (Na2SO4), filtered, and concentrated. Purification by silica gel chromatography afforded the title compound: MS (LC/MS) m/z 273 (M+H)+.

1. temperatureheated
2. temperatureat reflux for 48 hours
3. washwashed with brine
4. customThe layers were separated
5. extractionthe aqueous phase was extracted with EtOAc (2×)
6. dry with materialThe combined organic extracts were dried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customPurification by silica gel chromatography