Ethyl (2-methyloxazolo) coumarin-3-carboxylates were hydrolyzed with 2% aq.sodium hydroxide solution to give the corresponding carboxylic acids, respectively. The acid chlorides prepared from the carboxylic acids were condensed with secondary amines to give the corresponding 3-carbamoyl derivatives in good yield, respectively. Diethylamine, pyrrolidine, piperidine, and morpholine were used as secondary amines.
