5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3carboxaldehyde-3-oxime → 5-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carbonitrile

HRID 67459Notes

Reaction equation

HRID 67459 reaction equation
[CH3:1][N:2]1[C:8](=[O:9])[C:7]2[CH:10]=[CH:11][CH:12]=[CH:13][C:6]=2[N:5]2[CH:14]=[N:15][C:16]([CH:17]=[N:18]O)=[C:4]2[CH2:3]1>C(OC(=O)C)(=O)C>[CH3:1][N:2]1[C:8](=[O:9])[C:7]2[CH:10]=[CH:11][CH:12]=[CH:13][C:6]=2[N:5]2[CH:14]=[N:15][C:16]([C:17]#[N:18])=[C:4]2[CH2:3]1

Participants

3

Reactant 1

HCID 867382645,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3carboxaldehyde-3-oxime

Product 1

HCID 139845425-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carbonitrile

Reagents, catalysts & solvents 1

HCID 7918Acetic AnhydrideSolvent

Procedure

A solution of 4.8 g (18.7 mmol) of 5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxaldehyde-3-oxime in 50 ml of acetic acid anhydride is heated to boiling under reflux for 28 hours. After evaporation of the mixture in vacuo, the residue is taken up in 150 ml of chloroform and washed twice with 30 ml of saturated sodium hydrogen carbonate solution each time and with 30 ml of water. The organic phase is dried over magnesium sulphate and evaporated. After column chromatography on silica gel and recrystallisation from ethyl acetate, there is obtained 5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carbonitrile of melting point 184°-186° C.

Workup

  1. temperatureunder reflux for 28 hours
  2. customAfter evaporation of the mixture in vacuo
  3. washwashed twice with 30 ml of saturated sodium hydrogen carbonate solution each time
  4. dry with materialThe organic phase is dried over magnesium sulphate
  5. customevaporated
  6. customAfter column chromatography on silica gel and recrystallisation from ethyl acetate

Sources & evidence

ORD record
ord-df9d997a60ed425e9a79a584753b004f
Source dataset
uspto-grants-1982_08
Patent number
US04346034

Reaction notes

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