Methyl iodide → 3-Benzyloxy-5-methyl-4-oxo-7-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylic acid

HRID 1453827Notes

Reaction equation

HRID 1453827 reaction equation
[CH2:1]([O:8][C:9]1[C:10]([C:25]([O:27]C)=[O:26])=[N:11][N:12]2[CH:17]([C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)[CH2:16][NH:15][C:14](=[O:24])[C:13]=12)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Na+].I[CH3:32]>CN(C=O)C.O>[CH2:1]([O:8][C:9]1[C:10]([C:25]([OH:27])=[O:26])=[N:11][N:12]2[CH:17]([C:18]3[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=3)[CH2:16][N:15]([CH3:32])[C:14](=[O:24])[C:13]=12)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 68951327Methyl 3-benzyloxy-4-oxo-7-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate

Product 1

HCID 580097413-Benzyloxy-5-methyl-4-oxo-7-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylic acid

Reagents, catalysts & solvents 2

HCID 962WaterCatalystHCID 6228DimethylformamideSolvent

Procedure

To a solution of methyl 3-benzyloxy-4-oxo-7-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate (28 mg, 0.074 mmol) in anhydrous DMF under inert atmosphere was added sodium hydride (3 mg, 0.111 mmol, 95% dispersion in oil). The mixture was treated with iodomethane (6 μL, 0.089 mmol) and stirred at room temperature for 1 hour. When the methylation was complete, several drops of H2O were added and the mixture stirred at room temperature for 1 hour. The mixture was purified by reverse phase chromatography on a C-18 column using a gradient elution of 95-5% H2O (0.1% TFA)/CH3CN (0.1% TFA). Collection and concentration of the appropriate fractions yielded the title product as a white solid. 1H NMR (400 MHz, d6-DMSO) δ 12.90 (s, 1H), 7.51-7.49 (m, 2H), 7.39-7.31 (m, 6H), 7.01-7.00 (m, 2H), 5.80 (s, 1H), 5.27 (dd, J=11.2, 25.2 Hz, 2H), 4.21 (d, J=4.8 hz, 1H), 4.18 (d, J=4.4 Hz, 1H), 2.92 (s, 3H); ES MS (M+1)=378.

Workup

  1. stirringthe mixture stirred at room temperature for 1 hour
  2. customThe mixture was purified by reverse phase chromatography on a C-18 column
  3. washa gradient elution of 95-5% H2O (0.1% TFA)/CH3CN (0.1% TFA)
  4. customCollection and concentration of the appropriate fractions

Sources & evidence

ORD record
ord-323c18d3039c4bde902be74f25ea07ed
Source dataset
uspto-grants-2009_01
Patent number
US07476666B2

Reaction notes

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