Benzyl Bromide → 1-Benzyl-2-methyl-1H-pyrrole-3-carboxylic acid ethyl ester
Reaction equation
[CH2:1]([O:3][C:4]([C:6]1[CH:10]=[CH:9][NH:8][C:7]=1[CH3:11])=[O:5])[CH3:2].[CH2:12](Br)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.[H-].[Na+]>CN(C=O)C>[CH2:1]([O:3][C:4]([C:6]1[CH:10]=[CH:9][N:8]([CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)[C:7]=1[CH3:11])=[O:5])[CH3:2]Participants
Conditions
- Temperature
- 0 °C
Procedure
A mixture of 2-methyl-1H-pyrrole-3-carboxylic acid ethyl ester (6.05 g, 39.24 mmol), benzyl bromide (5.14 mL, 43.17 mmol) in DMF (50 mL) was cooled with an ice-water bath, then the solids of NaH (1.89 g, 47.09 mmol) were added in one portion, the mixture was stirred at 0° C. for 1.5 h, then quenched with saturated ammonium chloride aqueous solution, diluted with EtOAc, the organic phase was washed with water and saturated sodium chloride aqueous solution, respectively, dried over anhydrous sodium sulfate, filtered, concentrated, and the residue was purified with column chromatography to give the desired title product (5.537 g); 1H NMR (200 MHz, CDCl3): δ (ppm)=7.30 (m, 3H), 6.95 (m, 2H), 6.57 (d, 1H, J=3.0 Hz), 6.53 (d, 1H, J=3.0 Hz), 5.03 (s, 2H), 4.25 (q, 2H, J=7.0 Hz), 2.44 (s, 3H), 1.34 (t, 3H, J=7.0 Hz).
Workup
- temperaturewas cooled with an ice-water bath
- customquenched with saturated ammonium chloride aqueous solution
- additiondiluted with EtOAc
- washthe organic phase was washed with water and saturated sodium chloride aqueous solution
- dry with materialrespectively, dried over anhydrous sodium sulfate
- filtrationfiltered
- concentrationconcentrated
- customthe residue was purified with column chromatography
Sources & evidence
- ORD record
- ord-dfff5fd8c99c47f596125d64d0cd8a11
- Source dataset
- uspto-grants-2010_04
- Patent number
- US07696223B2
Reaction notes
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