Convenient Synthesis of a New Series of 3-Triazolonyl Iminocoumarins

Abstract

3-Cyano-7-diethylamino-N-ethoxycarbonyl-iminocoumarin reacted with different hydrazines as N-nucleophiles to afford, in one step, a new series of 2-N-substituted 3-triazolonyl-iminocoumarins in good yields. In two cases, N-unsubstituted derivatives were also obtained. The structures of all the products obtained were confirmed by infrared, ¹H NMR, ¹³C NMR, and elemental analysis. The optical properties of three of these compounds in dichloromethane and ethanol were reported.

Keywords:

• Iminocoumarin
• spectroscopic properties
• 3-triazolonyl iminocoumarin

Notes

^a Decomposition temperature = 170 °C.

^b Only N-unsubstituted compounds were obtained in all experiments.