Ethylenediamine → 4-Fluoro-N-[5-(5-methoxy-2-trifluoromethyl-benzoimidazol-1-yl)-pyrazin-2-yl]-benzamide

Participants

Reaction Steps

Into a 50 mL 3-necked round bottom flask, purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 1-(5-bromo-pyrazin-2-yl)-5-methoxy-2-trifluoromethyl-1H-benzoimidazole (iv) (100 mg, 0.27 mmol) in 1,4-dioxane (30 mL). To this was added 4-fluorobenzamide (80 mg, 0.58 mmol), K3PO4 (250 mg, 1.18 mmol), CuI (10 mg, 0.05 mmol) and ethane-1,2-diamine (EDA) (5 mg, 0.08 mmol). The resulting solution was stirred at reflux overnight. The reaction progress was monitored by TLC (EtOAc/PE=1:2). When the reaction had gone to completion, the mixture was filtered to remove the solid components, then concentrated under vacuum. The residue was dissolved in EtOAc, then washed with water. The organic layer was dried over Na2SO4, then concentrated to yield a crude product.

Provenance & Evidence