Imidazole → Ethyl 2-[2-(1-imidazolyl)ethyl]-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylate

HRID 1648265Notes

Reaction equation

HRID 1648265 reaction equation
[H-].[Na+].[NH:3]1[CH:7]=[CH:6][N:5]=[CH:4]1.[CH2:8]([O:10][C:11]([C:13]1[C:14]([CH2:37][CH2:38]Br)=[N:15][C:16]2[C:21]([C:22]=1[C:23]1[CH:28]=[CH:27][C:26]([O:29][CH3:30])=[C:25]([O:31][CH3:32])[CH:24]=1)=[CH:20][C:19]([O:33][CH3:34])=[C:18]([O:35][CH3:36])[CH:17]=2)=[O:12])[CH3:9].O>CN(C)C=O>[CH2:8]([O:10][C:11]([C:13]1[C:14]([CH2:37][CH2:38][N:3]2[CH:7]=[CH:6][N:5]=[CH:4]2)=[N:15][C:16]2[C:21]([C:22]=1[C:23]1[CH:28]=[CH:27][C:26]([O:29][CH3:30])=[C:25]([O:31][CH3:32])[CH:24]=1)=[CH:20][C:19]([O:33][CH3:34])=[C:18]([O:35][CH3:36])[CH:17]=2)=[O:12])[CH3:9]

Participants

6

Reactant 4

HCID 795ImidazoleHCID 962WaterHCID 24758Sodium hydrideHCID 11799673Ethyl 2-(2-bromoethyl)-4-(3,4-dimethoxyphenyl)-6,7-dimethoxyquinoline-3-carboxylate

Product 1

HCID 22097617Ethyl 2-[2-(1-imidazolyl)ethyl]-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylateYield 75.7%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Oily sodium hydride (60%, 0.044 g) was added to a solution of imidazole (0.075 g) in N,N-dimethylformamide (5 ml), followed by stirring at room temperature for 15 minutes. Then 2-(2-bromoethyl)-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylic acid ethyl ester (0.4 g) was added. After stirring at 80° C. for 1 hour, the reaction mixture was poured over water and extracted with ethyl acetate. The ethyl acetate layer was washed with water and then dried (MgSO4), after which the solvent was distilled off. The residue was subjected to silica gel column chromatography and eluted with ethyl acetate-methanol (10:1, v/v) to yield 2-[2-(1-imidazolyl)ethyl]-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylic acid ethyl ester (0.295 g, 66%), which was then recrystallized from ethyl acetate-hexane to yield a colorless prismatic crystal having a melting point of 173° to 174° C.

Workup

  1. stirringAfter stirring at 80° C. for 1 hour
  2. extractionextracted with ethyl acetate
  3. washThe ethyl acetate layer was washed with water
  4. dry with materialdried (MgSO4)
  5. distillationafter which the solvent was distilled off
  6. washeluted with ethyl acetate-methanol (10:1

Sources & evidence

ORD record
ord-1b86697d99a14892b31c4ac780373c20
Source dataset
uspto-grants-1995_07
Patent number
US05436247

Reaction notes

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