HCID 21764315, compound → ethyl 5,6-dihydro-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

HRID 1902416Notes

Reaction equation

HRID 1902416 reaction equation
COC1C=C(OC)C=CC=1C[N:6]1[C:12](=[O:13])[C:11]2[CH:14]=[CH:15][CH:16]=[CH:17][C:10]=2[N:9]2[CH:18]=[N:19][C:20]([C:21]([O:23][CH2:24][CH3:25])=[O:22])=[C:8]2[CH2:7]1>FC(F)(F)C(O)=O>[O:13]=[C:12]1[C:11]2[CH:14]=[CH:15][CH:16]=[CH:17][C:10]=2[N:9]2[CH:18]=[N:19][C:20]([C:21]([O:23][CH2:24][CH3:25])=[O:22])=[C:8]2[CH2:7][NH:6]1

Participants

3

Reactant 1

HCID 21764315HCID 21764315, compound

Product 1

HCID 21764316ethyl 5,6-dihydro-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

Reagents, catalysts & solvents 1

HCID 6422Trifluoroacetic acidSolvent

Procedure

90 g (214 mmol) of ethyl 5,6-dihydro-5-(2,4-dimethoxybenzyl)-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate are heated to reflux while stirring for 3 hours in 300 ml of trifluoroacetic acid. After evaporation in vacuo, the residue is treated with water and made alkaline with 10 percent potassium carbonate solution. The separated material is filtered off under suction, washed with water and dried in vacuo. After recrystallisation from chloroform/hexane, there is obtained ethyl 5,6-dihydro-6-oxo-4H-imidazo[1,5-a]-[1,4]benzodiazepine-3-carboxylate of melting point 248°-250° C.

Workup

  1. temperatureto reflux
  2. customAfter evaporation in vacuo
  3. additionthe residue is treated with water
  4. filtrationThe separated material is filtered off under suction
  5. washwashed with water
  6. customdried in vacuo
  7. customAfter recrystallisation from chloroform/hexane

Sources & evidence

ORD record
ord-ca14c64740974f6c937d2646a24a6511
Source dataset
uspto-grants-1982_12
Patent number
US04363762

Reaction notes

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