反应详情

A solution of 1.44 g of 27A in 3 ml of absolute ethanol was added drop-by-drop over 3 minutes to 3.4 ml of stirred absolute ethanol containing 0.9 g of anhydrous hydrogen chloride, at 0° C. The resulting mixture was stirred for 30 minutes, then a solution of 1.03 g of butyl nitrite in 2 ml of absolute ethanol was added drop-by-drop over 3 minutes at 0° C. The mixture was stirred for 30 minutes at 0° C., for 4 hours at room temperature, then stored in a refrigerator overnight. A precipitated solid was collected, washed with a small amount of water, mixed with a saturated potassium bicarbonate solution, and filtered. Recrystallization from water gave 4-(hydroximinomethyl)cinnoline (27B), as a solid, m.p.: 223° C. (with decomposition).

1. stirringThe mixture was stirred for 30 minutes at 0° C., for 4 hours at room temperature
2. customstored in a refrigerator overnight
3. customA precipitated solid was collected
4. washwashed with a small amount of water
5. additionmixed with a saturated potassium bicarbonate solution
6. filtrationfiltered
7. customRecrystallization from water