反应详情

To a solution of 5-chloro-2-mercaptobenzothiazole (38 g, 0.188 mol) in methylene chloride (750 mL) was added α-bromophenylacetic acid (38 g, 0.177 L mol) and triethylamine (38.5 g, 53 mL, 0.38 mol). The mixture was heated to reflux overnight. The clear solution was evaporated in vacuo and the residue was taken up in ethyl acetate, washed with dilute hydrochloric acid solution, then with water and finally dried over magnesium sulfate and filtered. The filtrate was concentrated in vacuo to a small volume and treated with n-hexane whereby the product crystallized out. Filtration yielded the product as a beige crystalline compound (41 g, 70%), m.p. 184°-185° C.

1. temperatureThe mixture was heated
2. temperatureto reflux overnight
3. customThe clear solution was evaporated in vacuo
4. washwashed with dilute hydrochloric acid solution
5. dry with materialwith water and finally dried over magnesium sulfate
6. filtrationfiltered
7. concentrationThe filtrate was concentrated in vacuo to a small volume
8. additiontreated with n-hexane whereby the product
9. customcrystallized out
10. filtrationFiltration