反应详情

2,6-Dichloro-3-hydrazinoquinoxaline (1.0 g., 0.0044 mole), the product of Preparation L(a), was refluxed with 15 ml. of triethyl orthopropionate for 4 hours and cooled to room temperature. The precipitate was recovered by filtration, washed with cyclohexane and air dried to afford 730 mg. (62% yield) of 4,8-dichloro-1-ethyl-[1,2,4]triazolo[4,3-a]quinoxaline, m.p. >250° C. Mass spectrum: m/e, 266 (P); m/e, 268 (P.+2).

1. temperaturewas refluxed with 15 ml
2. filtrationThe precipitate was recovered by filtration
3. washwashed with cyclohexane and air
4. customdried
5. customto afford 730 mg