反应详情

A mixture of 1-(5-trifluoromethylpyridin-2-yl)piperazine (0.4803 g), 6-chloro-2-(chloromethyl) imidazo[1,2-a]pyridine (Example 4, Step 1; 0.4177 g), triethylamine (0.231 g), and ethylene glycol (1 mL) is stirred at 80° C. for 70 min. after which additional 6-chloro-2-(chloromethyl)imidazo[1,2-a]pyridine (0.072 g) is added; thirty minutes later another portion (0.0517 g) is added. After stirring for a total of 2 h, the mixture is cooled and partitioned between dichloromethane and aq. sodium bicarbonate. The organic layers are dried over sodium sulfate and concentrated. Chromatography on silica gel using methanol/dichloromethane (4/96) and crystallization from ethyl ether/hexane gives 0.549 g of the title compound; mp 81-82° C.; MS m/z 395; IR (mineral oil) 1617, 1332, 1328, 1112, 1082 cm-1. 1H NMR (CDCl3) δ2.68, 3.69, 3.77, 6.62, 7.14, 7.52, 7.55, 7.61, 8.14, 8.38.

1. additionis added
2. additionthirty minutes later another portion (0.0517 g) is added
3. temperaturethe mixture is cooled
4. custompartitioned between dichloromethane and aq. sodium bicarbonate
5. dry with materialThe organic layers are dried over sodium sulfate
6. concentrationconcentrated
7. custommethanol/dichloromethane (4/96) and crystallization from ethyl ether/hexane