Phosphorus oxychloride → 2-(4-Trifluoromethylphenyl)-4-chloromethyl-5-methyloxazole

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Reaction Steps

Phosphorous oxychloride (0.72 mL, 7.8 mmol) was added dropwise to an oven-dried 100 mL pear-shaped flask charged with 18.1 (1.8 g, 7.00 mmol) and dichloromethane (20 mL). The reaction was refluxed under nitrogen atmosphere for 30 minutes and then cooled to room temperature. The reaction was washed with water (2×250 mL) and the combined aqueous layers were back extracted with DCM (2×25 mL). The combined organic layers were washed with brine and dried (Na2SO4). The solvent was removed under reduced pressure and the resulting residue was purified via radial chromatography (15% diethyl ether in hexanes) to yield 216 mg (15%) of 4-chloromethyl-5-methyl-2-(4-trifluoromethyl-phenyl)-oxazole as a white solid. LC/MSD m/e: 276.0 (M+H); 1H NMR (400 MHz) (CDCl3) δ 8.15 (2H, d, J=8.0 Hz), 7.73 (2H. d, J=8.0 Hz), 4.59 (2H, s), 2.48 (2H, s).

Provenance & Evidence