Dimethylformamide → 4'-(4-Bromo-2-ethoxy-5-formylimidazol-1-ylmethyl)biphenyl-2-carboxylic acid t-butyl ester

HRID 1693613Notes

Reaction equation

HRID 1693613 reaction equation
[Br:1][C:2]1[N:6]=[C:5]([O:7][CH2:8][CH3:9])[NH:4][C:3]=1[CH:10]=[O:11].[C:12]([O:16][C:17]([C:19]1[C:20]([C:25]2[CH:30]=[CH:29][C:28]([CH2:31]Br)=[CH:27][CH:26]=2)=[CH:21][CH:22]=[CH:23][CH:24]=1)=[O:18])([CH3:15])([CH3:14])[CH3:13].C(=O)([O-])[O-].[K+].[K+].CN(C=O)C>>[C:12]([O:16][C:17]([C:19]1[C:20]([C:25]2[CH:30]=[CH:29][C:28]([CH2:31][N:4]3[C:3]([CH:10]=[O:11])=[C:2]([Br:1])[N:6]=[C:5]3[O:7][CH2:8][CH3:9])=[CH:27][CH:26]=2)=[CH:21][CH:22]=[CH:23][CH:24]=1)=[O:18])([CH3:15])([CH3:14])[CH3:13]

Participants

5

Reactant 4

HCID 6228DimethylformamideHCID 11430Potassium CarbonateHCID 9906257tert-Butyl 4'-(bromomethyl)biphenyl-2-carboxylateHCID 178467395HCID 178467395, compound

Product 1

HCID 598309024'-(4-Bromo-2-ethoxy-5-formylimidazol-1-ylmethyl)biphenyl-2-carboxylic acid t-butyl esterYield 84.2%

Procedure

5-Bromo-2-ethoxy-3H-imidazole-4-carbaldehyde (3.0 g, 13.7 mmol), 4′-bromomethylbiphenyl-2-carboxylic acid t-butyl ester (4.8 g, 13.7 mmol), and potassium carbonate (1.9 g, 13.7 mmol), were dissolved in DMF (60 mL, 780 mmol), and the mixture was stirred at room temperature overnight. The reaction was quenched with water, and the mixture was extracted with EtOAc, washed with saturated aqueous NaCl, dried over MgSO4, filtered, and concentrated. The resulting material was purified by silica gel chromatography (0-30% EtOAc:hexanes) to yield intermediate (17a) (5.6 g). MS m/z: [M+H+] calcd for C24H25BrN2O4, 485.1. found 485.3. 1H-NMR (CDCl3): 9.58 (1H, s), 7.80 (1H, d), 7.50 (1H, t), 7.40 (1H, t), 7.30 (5H, m), 5.42 (2H, s), 4.57 (2H, q), 1.46 (3H, t), 1.18 (9H, s).

Workup

  1. customThe reaction was quenched with water
  2. extractionthe mixture was extracted with EtOAc
  3. washwashed with saturated aqueous NaCl
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe resulting material was purified by silica gel chromatography (0-30% EtOAc:hexanes)

Sources & evidence

ORD record
ord-8e189b6ed358405a81dac98db5a4e6a9
Source dataset
uspto-grants-2012_04
Patent number
US08158659B2

Reaction notes

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