Methyl (ethyl) 5-(2'-furyl) isoxazole-3-carboxylate (3a and 3b) were prepared frommethyl (ethyl) 2-furoylpropiolates with hydroxylamine, respectively. Methyl (ethyl) 5-(2'-furyl) pyrzaole-3-carboxylates (10a and 10b) were formed by the condensation ofmethyl (ethyl) 2- furoylpropiolates with hydrazine hydrate. The corresponding 5'-nitrofuran derivatives (4a and 11b) were obtained in usual manner, and the each position ofnitro group of the furan ...
