In a 20 mL vial a solution of 3-butyl-2,4-dimethylthiazol-3-ium iodide (47.92 mg, 0.16 mmol) dissolved in CH2Cl2 (0.5 mL) was added, followed by the addition of DMAP (49.24 mg, 0.40 mmol) dissolved in CH2Cl2 (0.8 mL). Then, to the solution was added 2-(trifluoromethyl)benzoyl chloride (33.4 mg, 0.16 mmol) dissolved in CH2Cl2 (0.5 mL). The vial was capped and shaken overnight at room temperature. The residue was dissolved in 1:1 DMSO/MeOH and purified by reverse phase HPLC using a Waters Sunfire C8 column (30×75 mm) eluting with a gradient of acetonitrile and 0.1% trifluoroacetic acid in water at a flow rate of 50 mL/min. Fractions selected by mass spectrometry to provide the title compound. 1H NMR (500 MHz, DMSO-D6/D2O) δ ppm 0.90 (t, 3 H) 1.27-1.38 (m, 2 H) 1.57-1.67 (m, 2 H) 2.27-2.32 (m, 3 H) 3.90-3.97 (m, 2 H) 5.99-6.02 (m, 1 H) 6.56-6.60 (m, 1 H) 7.53-7.62 (m, 2 H) 7.66-7.77 (m, 2 H); MS (ESI) positive ion 342 (M+H).
