Ethanol → (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylic acid

HRID 223338Notes

Reaction equation

HRID 223338 reaction equation
[Cl:1][C:2]1[C:7]2[C:8](=[O:24])[N:9]3[CH2:23][CH2:22][CH2:21][C@H:10]3[C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]([O:18]CC)=[O:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1.[OH-].[Na+].C(O)C>O>[Cl:1][C:2]1[C:7]2[C:8](=[O:24])[N:9]3[CH2:23][CH2:22][CH2:21][C@H:10]3[C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]([OH:18])=[O:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 702EthanolHCID 14798Sodium HydroxideHCID 53890667ethyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]-benzodiazepine-1-carboxylate

Product 1

HCID 22828765(S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylic acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

15 g (43.4 mmol) of ethyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate and 1.85 g (46.3 mmol) of sodium hydroxide are treated with 60 ml of ethanol and 10 ml of water, then heated to boiling under reflux for 45 minutes, the ethanol is subsequently distilled off in vacuo, the residue is treated with 46.5 ml of 1 N hydrochloric acid and left to stand in an ice-bath for 2 hours. The precipitated material is filtered off under suction, washed with water and dried to constant weight. There is obtained (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylic acid which has a decomposition point of 265°.

Workup

  1. temperatureheated
  2. temperatureunder reflux for 45 minutes
  3. distillationthe ethanol is subsequently distilled off in vacuo
  4. additionthe residue is treated with 46.5 ml of 1 N hydrochloric acid
  5. waitleft
  6. filtrationThe precipitated material is filtered off under suction
  7. washwashed with water
  8. customdried to constant weight

Sources & evidence

ORD record
ord-5e7b6bb01037448aae908d1a673e76e6
Source dataset
uspto-grants-1982_10
Patent number
US04353827

Reaction notes

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