Methyl 2,2,2-trichloroacetimidate → 6-fluoro-1-(4-methoxybutyl)-2-(trichloromethyl)-1H-benzimidazole
Reaction equation
[F:1][C:2]1[CH:8]=[CH:7][C:5]([NH2:6])=[C:4]([NH:9][CH2:10][CH2:11][CH2:12][CH2:13][O:14][CH3:15])[CH:3]=1.[Cl:16][C:17]([Cl:23])([Cl:22])[C:18](=N)OC>C(O)(=O)C>[F:1][C:2]1[CH:8]=[CH:7][C:5]2[N:6]=[C:18]([C:17]([Cl:23])([Cl:22])[Cl:16])[N:9]([CH2:10][CH2:11][CH2:12][CH2:13][O:14][CH3:15])[C:4]=2[CH:3]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
4-Fluoro-2-(4-methoxybutylamino)aniline (4.28 g) was dissolved in acetic acid (100 ml), methyl 2,2,2-trichloroethanimidate (2.49 ml) was added dropwise, and the mixture was stirred at room temperature for 2 hr. The reaction mixture was concentrated under reduced pressure, and the residue was azeotroped with toluene. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate was concentrated under reduced pressure to give the object product (6.53 g).