Phenethyl bromide → 4-(1-phenethyl-1H-benzoimidazol-2-ylmethyl)-benzoic acid methyl ester

HRID 1163090Notes

Reaction equation

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

Participants

Conditions

Temperature: 100 °C

Procedure

A solution of methyl 4-((1H-benzo[d]imidazol-2-yl)methyl)benzoate (200 mg, 0.75 mmol) in acetonitrile was treated with (2-bromoethyl)benzene (209 mg, 1.13 mmol) and potassium carbonate (143 mg, 0.90 mmol). The reaction mixture was heated with microwave irradiation at 100° C. for 2 h. The solvent was removed under reduced pressure and the residue was partitioned between water and dichloromethane. The organic phase was separated, dried over sodium sulfate and concentrated in vacuo. Purification of the resultant residue by flash column chromatography (silica, petroleum ether:ethyl acetate 8:2 to 1:1) afforded 4-(1-phenethyl-1H-benzoimidazol-2-ylmethyl)-benzoic acid methyl ester (30%). [M+H] 371.2.

Workup

customThe solvent was removed under reduced pressure
customthe residue was partitioned between water and dichloromethane
customThe organic phase was separated
dry with materialdried over sodium sulfate
concentrationconcentrated in vacuo
customPurification of the resultant residue by flash column chromatography (silica, petroleum ether:ethyl acetate 8:2 to 1:1)

Sources & evidence

ORD record: ord-5fb8cc03dd4f43a7975b149e513880c5
Source dataset: uspto-grants-2010_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07820825B2

Reaction notes

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