1-Hydroxybenzotriazole → 1,2-Dimethylbenzimidazole

Participants

Reaction Steps

To a mixture of 4-[3-(N-glycyl-N-methylamino)-2,6-dichlorobenzyloxy]-1,2-dimethyl-1H-benzimidazole (100 mg), 4-(methylcarbamoyl)cinnamic acid (55.4 mg) and dimethylformamide (1 ml) were added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (61.2 mg) and 1-hydroxybenzotriazole (49.7 mg), and the mixture was stirred for 3 hours at ambient temperature. To the mixture was added water, and the mixture was extracted with dichloromethane. The separated organic layer was washed with saturated sodium bicarbonate solution and brine, dried over magnesium sulfate and evaporated in vacuo. The residue was purified by preparative thin layer chromatography (dichloromethane-methanol) to give 4-[2,6-dichloro-3-[N-methyl-N-[4-(methyl-carbamoyl)cinnamoylglycyl]amino]benzyloxy]]-1,2-dimethyl-1H-benzimidazole (121 mg).

Provenance & Evidence