反应详情

To a suspension of 8.1 parts of 2-amino-7-chloro-5-phenyl-3H-1,4-benzodiazepine in 180 parts by volume of methanol are added 3.6 parts of 2-methylimidazole hydrochloride and 2.25 parts by volume of 80% hydrazine hydrate. The suspension is stirred at room temperature for 1.5 hours, and then 25 parts of ethyl orthoformate is added. To the mixture is added dropwise with stirring 60 parts by volume of ethanol containing 10% hydrogen chloride. After stirring for a further 1 hour, the mixture is warmed for a while so as to complete the reaction. After evaporation of the solvent, an aqueous solution of sodium bicarbonate is added to the residue to neutralize it. The mixture is then extracted with methylene chloride. The methylene chloride layer is washed with water and dried over sodium sulfate, followed by evaporation of the solvent. The residue is recrystallized from a mixture of acetone and n-hexane to give 8-chloro-6-phenyl-4H-s-triazolo [4,3-a][1,4] benzodiazepine as colorless flakes. Melting point; 226° C to 227° C.

1. additionTo the mixture is added dropwise
2. stirringAfter stirring for a further 1 hour
3. temperaturethe mixture is warmed for a while so as
4. customthe reaction
5. customAfter evaporation of the solvent
6. additionan aqueous solution of sodium bicarbonate is added to the residue
7. extractionThe mixture is then extracted with methylene chloride
8. washThe methylene chloride layer is washed with water
9. dry with materialdried over sodium sulfate
10. customfollowed by evaporation of the solvent
11. customThe residue is recrystallized from a mixture of acetone and n-hexane