Water → 7-chloro-4,5-dihydro-5-methyl-3-(1-propynyl)-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

HRID 1606955Notes

Reaction equation

HRID 1606955 reaction equation
[Cl:1][C:2]1[C:7]2[C:8](=[O:19])[N:9]([CH3:18])[CH2:10][C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]#[CH:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1.[H-].[Na+].[CH3:22]I.O>CN(C)C=O.CCCCCC>[Cl:1][C:2]1[C:7]2[C:8](=[O:19])[N:9]([CH3:18])[CH2:10][C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]#[C:17][CH3:22])[C:6]=2[CH:5]=[CH:4][CH:3]=1

Participants

7

Reactant 4

HCID 962WaterHCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 198515337-chloro-3-ethynyl-4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

Product 1

HCID 198515687-chloro-4,5-dihydro-5-methyl-3-(1-propynyl)-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8058HexaneSolvent

Procedure

2.72 g (10 mmol) of 7-chloro-3-ethynyl-4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one was dissolved in 20 ml of N,N-dimethylformamide. 1.31 g (30 mmol) of sodium hydride dispersion (55% in oil) was washed with n-hexane and then introduced at room temperature into the above solution. After 10 minutes 0.95 ml (15 mmol) of methyl iodide was added thereto and the mixture was stirred at room temperature for a further 3 hours. The reaction mixture was poured into 300 ml of water and extracted four times with methylene chloride. The organic extracts were washed four times with water and dried over magnesium sulphate. After chromatography of the residue on silica gel while eluting with ethyl acetate and recrystallization from ethyl acetate, there was obtained 7-chloro-4,5-dihydro-5-methyl-3-(1-propynyl)-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one of melting point 243°-244°.

Workup

  1. additionintroduced at room temperature into the above solution
  2. extractionextracted four times with methylene chloride
  3. washThe organic extracts were washed four times with water
  4. dry with materialdried over magnesium sulphate
  5. washAfter chromatography of the residue on silica gel while eluting with ethyl acetate and recrystallization from ethyl acetate

Sources & evidence

ORD record
ord-bb3fce22e4004d98aed4c110664b2afe
Source dataset
uspto-grants-1989_09
Patent number
US04863920

Reaction notes

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