反应详情

A stirred solution of N,N-dimethylhydroxylamine (3.67 g., 0.06 mole) in dry dimethylformamide (50 ml. is cooled in an ice bath, under nitrogen, and treated with a 57% mineral oil suspension of sodium hydride (0.84 g., 0.02 mole). The mixture of kept at ambient temperature for 1 hour (a precipitate formed) and then cooled in an ice bath and treated with 8-chloro-1-(chloromethyl)-6-phenyl-4H-s-triazolo[4,3-a][1,4]benzodiazepine (6.86 g., 0.02 mole). The mixture is kept at ambient temperature for 2 hours and concentrated in vacuo. Last traces of dimethylformamide are removed from the residue by the successive addition and distillation of xylene, toluene, and benzene. The resulting material is chromatographed on silica gel (250 g.) with methanol. The product thus obtained is crystallized from methanol-ethyl acetate following activated charcoal treatment) to give 8-chloro-1-[(dimethylamino)methyl]-6-phenyl-4H-s-triazolo[4,3-a][1,4]benzodiazepine, N1 -oxide, hydrate in three crops: 3.377 g. of melting point 160.5°-162.5° C.; 1.145 g. of melting point 160°-162° C.; and 0.785 g. of melting point 160°- 162° C. The analytical sample had a melting point of 157.5°-158.5° C. with decomposition.

1. temperatureis cooled in an ice bath, under nitrogen
2. additionThe mixture
3. custom(a precipitate formed) and
4. temperaturethen cooled in an ice bath
5. waitThe mixture is kept at ambient temperature for 2 hours
6. concentrationconcentrated in vacuo
7. customLast traces of dimethylformamide are removed from the residue by the successive addition and distillation of xylene, toluene, and benzene
8. customThe resulting material is chromatographed on silica gel (250 g.) with methanol
9. customThe product thus obtained
10. customis crystallized from methanol-ethyl acetate following activated charcoal treatment)