1-Ethyl-7-benzyloxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione → 1-Ethyl-7-hydroxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione

HRID 1430413Notes

Reaction equation

HRID 1430413 reaction equation
[CH2:1]([N:3]1[C:9](=[O:10])[C:8]([CH3:12])([CH3:11])[C:7](=[O:13])[N:6]([CH3:14])[C:5]2[CH:15]=[C:16]([O:19]CC3C=CC=CC=3)[CH:17]=[CH:18][C:4]1=2)[CH3:2]>[C].[Pd].C(O)C>[CH2:1]([N:3]1[C:9](=[O:10])[C:8]([CH3:12])([CH3:11])[C:7](=[O:13])[N:6]([CH3:14])[C:5]2[CH:15]=[C:16]([OH:19])[CH:17]=[CH:18][C:4]1=2)[CH3:2]

Participants

4

Reactant 1

HCID 509432951-Ethyl-7-benzyloxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione

Product 1

HCID 686733851-Ethyl-7-hydroxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dioneYield 96%

Reagents, catalysts & solvents 2

HCID 178418390HCID 178418390, compoundCatalystHCID 702EthanolSolvent

Procedure

10% palladium carbon (1.66 g, water content: 54.8%) was added to an ethanol (150 mL) solution of 1-ethyl-7-benzyloxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione (15.0 g, 42.6 mmol), and catalytic hydrogenation reaction was performed at 40-50° C., at 3 atm. The reaction solution was filtered to remove a catalyst, and ethanol was distilled off. Methanol (105 mL) and water (105 mL) were added to the resulting residue, and the mixture was heated while stirring. After the dissolution was confirmed, stirring under ice cooling was conducted for 1 hour, and precipitated crystals were collected by filtration. The resulting crystals were washed with 50% methanol (30 mL), and dried at 60° C., thereby obtaining 10.7 g of a white, powdery target compound (yield: 96%).

Workup

  1. customwas performed at 40-50° C., at 3 atm
  2. filtrationThe reaction solution was filtered
  3. customto remove a catalyst, and ethanol
  4. distillationwas distilled off
  5. additionMethanol (105 mL) and water (105 mL) were added to the resulting residue
  6. temperaturethe mixture was heated
  7. dissolutionAfter the dissolution
  8. stirringstirring under ice cooling
  9. customprecipitated crystals
  10. filtrationwere collected by filtration
  11. washThe resulting crystals were washed with 50% methanol (30 mL)
  12. customdried at 60° C.

Sources & evidence

ORD record
ord-eeea10f5dbc047ef86cbb8899aec51a2
Source dataset
uspto-grants-2015_01
Patent number
US08940889B2

Reaction notes

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