Methanol → 2-(2,4-dichloro-phenyl)-7-hydroxy-1H-benzoimidazole-4-carboxylic acid methyl ester

반응식

[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[NH:13][C:12]2[C:14]([OH:21])=[CH:15][CH:16]=[C:17]([C:18]([OH:20])=[O:19])[C:11]=2[N:10]=1.OS(O)(=O)=O.[CH3:27]O>>[CH3:27][O:19][C:18]([C:17]1[C:11]2[N:10]=[C:9]([C:3]3[CH:4]=[CH:5][C:6]([Cl:8])=[CH:7][C:2]=3[Cl:1])[NH:13][C:12]=2[C:14]([OH:21])=[CH:15][CH:16]=1)=[O:20]

참가 물질

반응물 3

HCID 887Methanol

HCID 1118Sulfuric Acid

HCID 691199912-(2,4-dichloro-phenyl)-7-hydroxy-1H-benzoimidazole-4-carboxylic acid

생성물 1

HCID 691323632-(2,4-dichloro-phenyl)-7-hydroxy-1H-benzoimidazole-4-carboxylic acid methyl ester수율 86%

실험 절차

2-(2,4-dichloro-phenyl)-7-hydroxy-1H-benzoimidazole-4-carboxylic acid (1.63 g, 5.03 mmol) obtained in step 3 was dissolved in 30 ml of methanol, and H2SO4 (1.08 ml, 20.12 mmol) was added dropwise thereto and refluxed for 15 hours. The resulting solution was cooled to room temperature, concentrated under a reduced pressure to remove methanol, and the residue was neutralized with NaHCO3. Then, the neutralized residue was extracted with ethyl acetate and concentrated under a reduced pressure to obtain a residue which was purified by recrystallization from ethyl acetate/hexane to obtain the title compound (1.5 g, 3.62 mmol) in a yield of 86%.