反应详情

A mixture of 2-bromo-1-(6-methylimidazo[2,1-b]thiazol-5-yl)ethanone hydrobromide (18) (2.20 g, 6.5 mmol) and (p-ethoxyphenyl)thiourea (10) (1.30 g, 6.5 mmol) in 40 mL of anhydrous ethanol was refluxed under stirring for 20 h, and then cooled to room temperature. The solid was filtered. The crude white solid product was re-crystallized from methanol. The methanol solution was filtered while still hot to remove possible dust, and then heated into solution. It was re-crystallized two more times from methanol, and dried under vacuum to provide the desired product 20 as a white solid, yield 0.64 g (22.4%), HPLC purity 97.81%, mp >240° C. 1HNMR (CD3OD) δ 1.27 (t, 3H, J=6.8 Hz), 2.56 (s, 3H), 3.88-3.94 (m, 2H), 6.85 (d, 2H, J=8.8 Hz), 6.97 (s, 1H), 7.34 (d, 2H, J=8.8 Hz), 7.54 (d, 1H, J=4.4 Hz), 8.44 (d, 1H, J=4.4 Hz). ESI-MS m/z 357 (M+1)+.

1. temperaturewas refluxed
2. filtrationThe solid was filtered
3. customThe crude white solid product was re-crystallized from methanol
4. filtrationThe methanol solution was filtered while still hot
5. customto remove possible dust
6. temperatureheated into solution
7. customIt was re-crystallized two more times from methanol
8. customdried under vacuum