反应详情

To a solution of tert-butyl 2-amino-4-(thiophen-2yl)phenylcarbamate (0.12 g, 0.41 mmol, 1.0 equiv.) in pyridine (2 mL) was added a solution of dimethylcarbamic chloride (0.07 g, 0.62 mmol, 1.5 equiv.) in toluene (0.3 mL). The resulting solution was stirred at room temperature overnight. The crude residue was diluted with water (10 mL) and extracted with ethyl acetate (10 mL×2). The combined organic layers were washed with water (10 mL), dried, filtered and concentrated. The crude residue was washed with petroleum ether (5 mL) to afford tert-butyl (2-(3,3-dimethylureido)-4-(thiophen-2-yl)phenyl)carbamate (0.12 g, 80% yield).

1. extractionextracted with ethyl acetate (10 mL×2)
2. washThe combined organic layers were washed with water (10 mL)
3. customdried
4. filtrationfiltered
5. concentrationconcentrated
6. washThe crude residue was washed with petroleum ether (5 mL)