4,5-dihydro-3-(hydroxymethyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one → 5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxaldehyde

HRID 67361

Reaction equation

HRID 67361 reaction equation
[OH:1][CH2:2][C:3]1[N:4]=[CH:5][N:6]2[C:12]3[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=3[C:10](=[O:17])[N:9]([CH3:18])[CH2:8][C:7]=12>[O-2].[O-2].[Mn+4].C(Cl)Cl>[CH3:18][N:9]1[C:10](=[O:17])[C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=2[N:6]2[CH:5]=[N:4][C:3]([CH:2]=[O:1])=[C:7]2[CH2:8]1

Participants

4

Reactant 1

HCID 198516024,5-dihydro-3-(hydroxymethyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

Product 1

HCID 198330205,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxaldehyde

Reagents, catalysts & solvents 2

HCID 178418406HCID 178418406, compoundCatalystHCID 6344DichloromethaneSolvent

Procedure

A mixture of 12.2 g (50 mmol) of 4,5-dihydro-3-(hydroxymethyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one, 80.0 g of manganese dioxide and 500 ml of absolute methylene chloride is stirred at room temperature for 1 hour under an argon atmosphere and subsequently the manganese dioxide is filtered off under suction over Dicalit while rinsing with methylene chloride. The filtrate is evaporated to dryness in vacuo. After warming the residue in ca 150 ml of ethyl acetate, there is obtained 5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxaldehyde of melting point 205°-207° C.

Workup

  1. filtrationsubsequently the manganese dioxide is filtered off under suction over Dicalit
  2. washwhile rinsing with methylene chloride
  3. customThe filtrate is evaporated to dryness in vacuo
  4. temperatureAfter warming the residue in ca 150 ml of ethyl acetate

Sources & evidence

ORD record
ord-ce3d08f0075f4c099d4d23fb4099a6b0
Source dataset
uspto-grants-1982_08
Patent number
US04346031

Linked notes

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