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0 °C

A mixture of 4-(5-oxazolyl)benzoic acid (1.0 g, 5.46 mmol) and Et3N (552 mg, 5.46 mmol) in 25 mL of THF was cooled to 0° C. and ClCOOi-Bu (745 mg, 5.46 mmol) was added dropwise. After the addition was over, the reaction mixture was stirred for additional 5 min and then aq NH4OH (0.63 mL of 28% solution, 10.46 mmol) was added. After overnight stirring, the solvent was evaporated, the residue was taken up in water and basified to pH 9. The precipitated solid was filtered, washed with water and dried over P2O5 in a vacuum desiccator to provide 500 mg (48%) of the 4-(5-oxazolyl)-benzamide: 1H NMR (DMSO-d6) δ 8.50 (s, 1H), 8.20–7.80 (m, 5H).

1. additionAfter the addition
2. stirringAfter overnight stirring
3. customthe solvent was evaporated
4. filtrationThe precipitated solid was filtered
5. washwashed with water
6. dry with materialdried over P2O5 in a vacuum desiccator