反应详情

3-Methoxy-1,2,4-thiadiazol-5-amine a (500 mg, 3.82 mmol) and phenyl carbonochloridate b (600 mg, 3.82 mmol) were dissolved in 20 mL of dichloromethane, followed by addition of triethylamine (0.8 mL, 5.73 mmol). After reacting for 16 hours, 30 mL of H2O were added into the reaction mixture to dilute the solution. The aqueous phase and organic phase were separated, the aqueous phase was extracted with dichloromethane (20 mL×2), and the organic phases were combined, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure, and the resulting residue was purified by silica gel column chromatography with elution system A to obtain the title product phenyl(3-methoxy-1,2,4-thiadiazol-5-yl)carbamate c (200 mg, yield 20.8%) as a white solid.

1. additionto dilute the solution
2. customThe aqueous phase and organic phase were separated
3. extractionthe aqueous phase was extracted with dichloromethane (20 mL×2)
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationThe filtrate was concentrated under reduced pressure
7. customthe resulting residue was purified by silica gel column chromatography with elution system