Water → t-butyl 5,6-dihydro-5-methyl-6-thioxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

HRID 223191Notes

Reaction equation

HRID 223191 reaction equation
[CH3:1][N:2]1[C:8](=O)[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]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])=[C:4]2[CH2:3]1.COC1C=CC(P2(=S)SP(=S)(C3C=CC(OC)=CC=3)[S:33]2)=CC=1.O>C1(C)C=CC=CC=1>[CH3:1][N:2]1[C:8](=[S:33])[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]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])=[C:4]2[CH2:3]1

Participants

5

Reactant 3

HCID 962WaterHCID 87949Lawesson's reagentHCID 398203t-butyl 5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

Product 1

HCID 20523279t-butyl 5,6-dihydro-5-methyl-6-thioxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

1 g of t-butyl 5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate in 50 ml of toluene is treated with 0.82 g of 2,4-bis(p-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulphide and the mixture obtained is heated to boiling under reflux for 6 hours. The mixture is poured into water and the toluene phase is separated. After drying the organic phase over magnesium sulphate and evaporation, the crude product is chromatographed on silica gel. There is obtained t-butyl 5,6-dihydro-5-methyl-6-thioxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate on melting point 207°-208°.

Workup

  1. customthe mixture obtained
  2. temperatureis heated
  3. temperatureunder reflux for 6 hours
  4. customthe toluene phase is separated
  5. customAfter drying the organic phase
  6. customover magnesium sulphate and evaporation
  7. customthe crude product is chromatographed on silica gel

Sources & evidence

ORD record
ord-99c394baa04b45959c84a397416d5552
Source dataset
uspto-grants-1982_10
Patent number
US04352817

Reaction notes

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