反应详情

To a mixture of 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid (500 mg, 1.90 mmol) in methylene chloride (15 mL) was added oxalyl chloride (0.34 mL, 3.80 mmol) dropwise at 0° C. This was followed by a drop of DMF. The reaction was warmed to room temperature and stirred at room temperature for 1.5 hr. The mixture was concentrated to dryness to afford 2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl chloride as a light yellow solid which was used in the next step without further purification.

1. concentrationThe mixture was concentrated to dryness