反应详情

A solution of 1.60 g (0.005 mole) of 6-phenyl-8-chloro-4H-s-triazolo[4,3-a][1,4]benzodiazepine-1-carbonitrile in a mixture of 50 ml of methanol and 50 ml of 1N sodium hydroxide solution is allowed to stand for ca. 10 minutes at 25°. The reaction mixture is then neutralised with 2N hydrochloric acid, and concentrated to about half its volume. The concentrate is extracted in methylene chloride, the organic solution washed with saturated sodium chloride solution, dried over sodium sulphate and concentrated by evaporation. The residue is crystallised from methanol/ethyl acetate/petroleum ether to obtain 6-phenyl-8-chloro-4H-s-triazolo [4,3-a][1,4]benzodiazepine-1-carboxamide, M.P. 285°-289°.

1. concentrationconcentrated to about half its volume
2. extractionThe concentrate is extracted in methylene chloride
3. washthe organic solution washed with saturated sodium chloride solution
4. dry with materialdried over sodium sulphate
5. concentrationconcentrated by evaporation
6. customThe residue is crystallised from methanol/ethyl acetate/petroleum ether