Hydrochloric Acid → HCID 178506334, compound

Participants

Reaction Conditions

Reaction Steps

Compound number 140 (i.e., 6-chloro-5-(2,3-dichlorophenoxy)-2-heptafluoropropylbenzimidazole) was prepared as follows. 4-chloro-5-(2,3-dichlorophenoxyl)benzene-1,2-diamine (150 mg, 0.49 mmol, 1.00 equiv), heptafluorobutanoic acid (15 mL) and hydrogen chloride (3 mL) was placed into a 100-mL round-bottom flask. The resulting solution was stirred overnight at 110° C. in an oil bath. The reaction mixture was cooled to room temperature. The resulting solution was extracted with 3×50 mL of ethyl acetate and the organic layers combined. The resulting mixture was washed with 3×100 mL of brine. The resulting mixture was concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:1). The crude product was re-crystallized from EA/hexane in the ratio of 1/1. This resulted in 63.4 mg (27%) of 6-chloro-5-(2,3-dichlorophenoxy)-2-heptafluoropropylbenzimidazole as a white solid.

Provenance & Evidence