How is 5-(4-Nitrophenyl)-1,2-oxazole-3-carboxylic acid (CAS: 33282-25-6) typically synthesized?

5-(4-Nitrophenyl)-1,2-oxazole-3-carboxylic acid is typically synthesized via a multi-step process starting from 4-nitrobenzaldehyde and oxazole. The key steps involve the formation of an oxazoline intermediate, followed by the addition of a nucleophile to form the final product. Commonly, this involves the reaction of 4-nitrobenzaldehyde with oxazole in the presence of a base, followed by acidification to obtain the carboxylic acid.