How is Ethyl 5,5-diphenyl-4,5-dihydro-1,2-oxazole-3-carboxylate (CAS: 163520-33-0) typically synthesized?

Ethyl 5,5-diphenyl-4,5-dihydro-1,2-oxazole-3-carboxylate is typically synthesized from ethyl 3-carbamoylbenzoate and phenylhydrazine. The reaction involves the condensation of the carboxylic acid derivative with the amine to form the oxazole ring. Commonly, this is achieved in the presence of a base like triethylamine, with an overall yield of around 75-80%. The reaction is carried out under mild conditions and can be optimized for better selectivity and yield.