Acetic Acid → ethyl 1-(4-chlorophenyl)-2-propyl-1H-imidazole-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(4-chlorophenyl)butyrimidamide (compound 3, 3.5 g, 17.80 mmol), NaHCO3 (3.14 g, 37.38 mmol) in i-PrOH was added ethyl bromopyruvate (compound 4, 4.7 mL, 37.38 mmol) under N2. The reaction mixture was stirred at 85° C. for 72 hrs, then added AcOH (15 mL). After 4 hrs, the mixture was concentrated under reduced pressure. The residue was diluted with H2O, and extracted with CH2Cl2. The organic layer was washed with saturated NaHCO3 and 1N-HCl solution, then dried over anhydrous MgSO4, filtered and concentrated in vacuo. The crude product was purified by flash column chromatography (Biotage Isolera™ FLASH Purification System was used for normal phase column chromatography with EtOAc and hexane) to provide the title compound (1.28 g, 25%) as a brown oil.

Provenance & Evidence