反应详情

A solution of concentrated hydrochloric acid HCl (20 ml) in water (30 ml) is added to N-[5-(4-Methoxy-phenyl)-4-methyl-thiazol-2-yl]-acetamide (Example 28a) (2 g, 7.63 mmol) in ethanol. After 5 hours at reflux, the reaction is poured into water (600 ml) and the pH is adjusted to 9/10 with 2.5 M NaOH. The aqueous layer is then extracted with ethyl acetate (3×200 ml). The combined organic layers are dried over MgSO4, filtered and concentrated to afford 5-(4-Methoxy-phenyl)-4-methyl-thiazol-2-ylamine.

1. temperatureAfter 5 hours at reflux
2. extractionThe aqueous layer is then extracted with ethyl acetate (3×200 ml)
3. dry with materialThe combined organic layers are dried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated