preparation | in order to realize the convenient and simple synthesis of 4H-thiophene [3,2-b] pyrrole -5-carboxylate ethyl ester, a new method is adopted in this paper, I .e. 2-thiophene formaldehyde and ethyl azidoacetate are used as raw materials, ethyl 4H-thiophene [3,2-b] pyrrole-5-carboxylate was synthesized at room temperature. Or 4H-thiazole [3,2-B] pyrrole-5-carboxylic acid is used as the starting material and reacted with ethanol to obtain 4H-thiophene [3,2-b] pyrrole-5-carboxylic acid ethyl ester. The synthesis reaction formula of 4H-thiophene [3,2-b] pyrrole -5-carboxylic acid ethyl ester is as follows: |