反应详情

A few drops of dimethylformamide and then, dropwise, 2.8 ml of thionyl chloride are added to 5 g of 4-phenylbutyric acid, in solution in 60 ml of anhydrous dichloromethane, at a temperature in the region of 20° C. After reacting overnight at the same temperature, the reaction mixture is concentrated to dryness under reduced pressure. The chloride of 4-phenylbutyric acid thus prepared is added dropwise to 1 g of 8-amino-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazine-4-one, in solution in 75 ml of dimethylformamide, at a temperature in the region of 20° C. The reaction mixture is heated at reflux for 7 hours. The precipitate formed is filtered and recrystallized from dimethylformamide. After filtration, washing with water and then ethyl ether and drying under partial vacuum (1 mm Hg, 0.13 kPa) at 80° C., there is obtained 0.64 g of 8-(4-phenylbutyrylamino-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazine-4-one in the form of an ochre solid which decomposes at 190° C. (Analysis C23H20N4O2.0.63H2O.0.79DMF, % calculated C: 71.86, H: 5.24, N: 14.57, % found C: 71.5, H: 5.1, N: 14.8).

1. concentrationthe reaction mixture is concentrated to dryness under reduced pressure
2. customThe chloride of 4-phenylbutyric acid thus prepared
3. temperatureThe reaction mixture is heated
4. temperatureat reflux for 7 hours
5. customThe precipitate formed
6. filtrationis filtered
7. customrecrystallized from dimethylformamide
8. filtrationAfter filtration
9. washwashing with water
10. dry with materialethyl ether and drying under partial vacuum (1 mm Hg, 0.13 kPa) at 80° C.