Water → 7-chloro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxamidoxime
Reaction equation
[Cl:1][C:2]1[C:7]2[C:8](=[O:19])[N:9]([CH3:18])[CH2:10][C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]#[N:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1.Cl.[NH2:21][OH:22].C[O-].[Na+].O>CN(C)C=O>[Cl:1][C:2]1[C:7]2[C:8](=[O:19])[N:9]([CH3:18])[CH2:10][C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16](=[N:21][OH:22])[NH2:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1Participants
Reactant 4
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 1 °C
Procedure
16.8 g 7-Chloro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carbonitrile were suspended under stirring and argon atmosphere in 101 ml N,N-dimethylformamide and 13.48 g hydroxylamine hydrochloride were added in one portion. 34.2 ml Sodium methanolate were then added over 60 minutes to the yellow suspension, which turned to a colorless suspension. It was stirred one more hour at r.t., then cooled to 0-2° C. and 202 ml deionized water were added over 30 minutes. After stirring one more hour at 0° C., the precipitate (7-chloro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxamidoxime (VIII)) was filtered off, washed twice with 40 ml deionized water and dried under vacuum at 70° C. for 18 hours. Crude product: 17.84 g as a white powder. m.p. >250° C.
Workup
- stirringIt was stirred one more hour at r.t.
- additionwere added over 30 minutes
- stirringAfter stirring one more hour at 0° C.
- filtrationthe precipitate (7-chloro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxamidoxime (VIII)) was filtered off
- washwashed twice with 40 ml
- customdried under vacuum at 70° C. for 18 hours
Sources & evidence
- ORD record
- ord-3fc77cdd5e9347d4bb8dedd6c5300552
- Source dataset
- uspto-grants-2001_08
- Patent number
- US06281353B1
Reaction notes
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