反应详情

To a flask containing 2,4-dimethylthiazole-5-carboxylic acid (2.50 g, 15.9 mmol) was added DCM (75 mL) and DMF (3 mL) to afford a homogeneous solution. Then, carbonyldiimidazole (2.84 g, 17.5 mmol) was added and the mixture was stirred at room temperature for 2 hours. N,O-dimethylhydroxylamine hydrochloride (1.90 g, 19.9 mmol) was then added and the reaction mixture was stirred at room temperature for 18 hours, then diluted with water and 1 N NaOH and extracted with DCM (4×50 mL). The combined organics were washed with brine, dried over Na2SO4, filtered and concentrated. Flash chromatography on silica gel (10-40% EtOAc-DCM) provided the title compound as a colorless oil.

1. customto afford a homogeneous solution
2. stirringthe reaction mixture was stirred at room temperature for 18 hours
3. extractionextracted with DCM (4×50 mL)
4. washThe combined organics were washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated