反应详情

A mixture of 2-acetylamino-5-(3-pyridylthio)thiazole (8.5 g) in a mixture of ethanol (160 ml), tetrahydrofuran (50 ml) and aqueous 6N hydrochloric acid (100 ml) was refluxed for 4 hours with stirring. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in water. The solution was adjusted to pH 8.5 using aqueous sodium bicarbonate and the precipitates were collected by filtration, washed with water and dried in vacuo to give 2-amino-5-(3-pyridylthio)thiazole (5.6 g yield: 78.9%). mp: 140°-142° C. IR (Nujol): 3400, 3300, 3125, 1630, 1530, 1490 cm-1

1. temperaturewas refluxed for 4 hours
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. dissolutionthe residue was dissolved in water
4. filtrationthe precipitates were collected by filtration
5. washwashed with water
6. customdried in vacuo