反应详情

2-Chloro-3-hydrazinoquinoxaline (3.0 g., 0.015 mole), the product of Example 1, was stirred with triethyl orthobutyrate (27 ml.) at 100° C. for 2 hours. The mixture was cooled to room temperature, and the precipitate was collected by filtration and washed with cyclohexane. The crude solid was taken up in chloroform and filtered to remove insoluble material. The chloroform solution was concentrated in vacuo to give a solid which was recrystallized from chloroform to give 1.96 g. (53% yield) of 4-chloro-1-n-propyl-[1,2,4]triazolo[4,3-a]quinoxaline, m.p. 173°-175° C. Mass spectrum: m/e, 246 (P).

1. filtrationthe precipitate was collected by filtration
2. washwashed with cyclohexane
3. filtrationfiltered
4. customto remove insoluble material
5. concentrationThe chloroform solution was concentrated in vacuo
6. customto give a solid which
7. customwas recrystallized from chloroform
8. customto give 1.96 g