反应详情

A suspension of 2-(4-chlorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid (5.0 g, 0.0174 mole), 1,1'-carbonyldiimidazole (2,82 g, 0.0174 mole) and dry tetrahydrofuran (100 ml) was stirred at room temperature for 3.5 hours while nitrogen was bubbled through it. Solid thiazolidine (2.33 g, 0.0261 mole) was added and the reaction mixture was stirred at 55° C., under nitrogen overnight. The solvent was removed under reduced pressure. The resulting white solid was triturated with water (100 ml), filtered, rinsed with water, twice with 5% potassium hydroxide solution and twice more with water. The resulting solid was heated in boiling isopropyl alcohol and filtered hot. Upon cooling to room temperature, a white solid precipitated. The solid was collected by filtration and dried under high vacuum to give 3.08 g (49.4%) of title compound, mp. 215°-218° C.

1. customwas bubbled through it
2. stirringthe reaction mixture was stirred at 55° C., under nitrogen overnight
3. customThe solvent was removed under reduced pressure
4. customThe resulting white solid was triturated with water (100 ml)
5. filtrationfiltered
6. washrinsed with water, twice with 5% potassium hydroxide solution and twice more with water
7. temperatureThe resulting solid was heated
8. filtrationfiltered hot
9. temperatureUpon cooling to room temperature
10. customa white solid precipitated
11. filtrationThe solid was collected by filtration
12. customdried under high vacuum