Hydrochloric Acid → 4'-[[5,7-dimethyl-2-ethyl-3H-imidazo[4,5-b]pyridin-3-yl]methyl][1,1'-biphenyl-2-yl]carboxylic acid methyl ester

HRID 1742222Notes

Reaction equation

HRID 1742222 reaction equation
[H-].[Na+].[CH3:3][C:4]1[N:9]=[C:8]2[N:10]=[C:11]([CH2:13][CH3:14])[NH:12][C:7]2=[C:6]([CH3:15])[CH:5]=1.Br[CH2:17][C:18]1[CH:23]=[CH:22][C:21]([C:24]2[C:25]([C:30]([O:32][CH3:33])=[O:31])=[CH:26][CH:27]=[CH:28][CH:29]=2)=[CH:20][CH:19]=1.Cl>CN(C=O)C.O>[CH3:33][O:32][C:30]([C:25]1[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=1[C:21]1[CH:20]=[CH:19][C:18]([CH2:17][N:10]2[C:8]3=[N:9][C:4]([CH3:3])=[CH:5][C:6]([CH3:15])=[C:7]3[N:12]=[C:11]2[CH2:13][CH3:14])=[CH:23][CH:22]=1)=[O:31]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 24758Sodium hydrideHCID 98153742,6-Dimethyl-8-ethyl-1-deazapurineHCID 11012181Methyl 4'-(bromomethyl)biphenyl-2-carboxylate

Product 1

HCID 214641284'-[[5,7-dimethyl-2-ethyl-3H-imidazo[4,5-b]pyridin-3-yl]methyl][1,1'-biphenyl-2-yl]carboxylic acid methyl esterYield 61%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent2×

Procedure

To a suspension of sodium hydride (345 mg, 60% in oil, 8.6 mmol) in dry DMF (10 mL) was added 5,7-dimethyl-2-ethylimidazo[4,5-b]pyridine (1.5 g, 8.6 mmol) under an atmosphere of dry nitrogen. The reaction mixture was stirred at room temperature until the evolution of gas subsided. The reaction mixture was cooled to 0° C. and a solution of methyl 4'-bromomethylbiphenyl-2-carboxylate (2.7 g, 8.84 mmol) in dry DMF (5 mL) was added dropwise. The resulting solution was stirred at room temperature overnight. The reaction mixture was poured into water (250 mL), the pH was adjusted to pH 6 by the addition of 1N HCl, and the product was extracted into ethyl acetate. Flash chromatography (silica, ethyl acetate) gave 4'-[[5,7-dimethyl-2-ethyl-3H-imidazo[4,5-b]pyridin-3-yl]methyl][1,1'-biphenyl-2-yl]carboxylic acid methyl ester (2.05 g, 61%) as an amorphous solid.

Workup

  1. temperatureThe reaction mixture was cooled to 0° C.
  2. stirringThe resulting solution was stirred at room temperature overnight
  3. extractionthe product was extracted into ethyl acetate

Sources & evidence

ORD record
ord-d5af2c29eb1b4d8ab014aab996120da3
Source dataset
uspto-grants-1994_08
Patent number
US05338737

Reaction notes

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