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Monoethylamine was bubbled through a solution of 4-chloro-1-ethyl-[1,2,4]triazolo[4,3-a]quinoxaline (1.2 g., 0.005 mole), the product of Example 4, in N,N-dimethylformamide (50 ml.) at 0° C. for about 2 minutes. The clear solution was stirred at 0° C. for 30 minutes and at room temperature for 2 hours. The reaction mixture was next poured over ice and the precipitate was separated by filtration, washed with water and air dried. Recrystallization from ethanol then afforded 1.0 g. (83% yield) of pure 1-ethyl-4-ethylamino-[1,2,4]triazolo[4,3-a]quinoxaline as white solid (m.p. 235°-238° C.).

1. additionThe reaction mixture was next poured over ice
2. customthe precipitate was separated by filtration
3. washwashed with water and air
4. customdried
5. customRecrystallization from ethanol
6. customthen afforded 1.0 g