An excess of 5-phenyl-2-trifluoromethyl-furan-3-carbonyl chloride (1 g, 3.6 mmol) was added to a solution of 3,5-bis-trifluoromethyl-phenylamine (0.758 g, 3.3 mmol) and N,N-diisopropylethylamine (0.58 mL) in dichloromethane (50 mL). After stirring at room temperature for 1 day, the reaction underwent an aqueous acidic (dilute HCl, 2×30 mL) and basic (dilute NaHCO3, 2×30 mL) workup followed by washing with brine (saturated NaCl, 2×30 mL), drying over MgSO4, and concentration. The crude compound was purified by passing through a silica gel plug eluting with ethyl acetate/hexanes (2:1) to afford the title compound (1.42 g, 92% yield). ES-MS negative Q1 (m/z) 466.
