反应详情

A solution of 4-acetamido-2-bromo-thiazole (22 g., 0.2 m) and sodium acetate (8.2 g, 0.1 m) in methanol (600 ml) was hydrogenated at room temperature and 1 atm. pressure oven 10% palladium on carbon (5 g) until the theoretical uptake of hydrogen had occurred (about 3 hours). The catalyst was removed by filtration and the filtrate evaporated to dryness under reduced pressure. The residue was extracted with carbon tetrachloride (200 ml) in a Soxlet apparatus. The extract was cooled and the crystals removed by filtration to yield 4-acetamidothiazole (12 g, 78%). m.p. 176° C. Found: C, 41.8; H, 4.3; N, 19.3. C5H6N2OS requires: C, 42.2; H, 4.3; N, 19.7%.

1. customwas hydrogenated at room temperature
2. custom(about 3 hours)
3. customThe catalyst was removed by filtration
4. customthe filtrate evaporated to dryness under reduced pressure
5. extractionThe residue was extracted with carbon tetrachloride (200 ml) in a Soxlet apparatus
6. temperatureThe extract was cooled
7. customthe crystals removed by filtration