Synthesis of New Benzopyrano[2,3-c]pyrazoles and 3-triazolonyliminocoumarins From 3-cyano Iminocoumarin Derivatives

Abstract

Synthesis of benzopyrano[2,3-c]pyrazoles and 3-triazolonyliminocoumarins was successfully performed using heterocyclization of 3-cyano iminocoumarin or their N-ethoxycarbonylated derivatives with semicarbazide reagents. Elemental analysis, infrared, and ¹H NMR spectral data confirmed the molecular structure of the newly synthesized compounds.

GRAPHICAL ABSTRACT

Keywords:

• Benzopyrano[2,3-c]pyrazole
• iminocoumarin
• 4-phenylsemicarbazide
• thiosemicarbazide
• triazolonyliminocoumarin

ACKNOWLEDGMENTS

The authors acknowledge Pr. Rachid El Gharbi for his useful discussions about this work.

Notes

^a Isolated yield.

^a Isolated yield.