Convenient Synthesis of a New Series of 3-Triazolonyl Iminocoumarins

A Simple Efficient Procedure for the Synthesis of Benzopyrano[2,3‐c]pyrazoles

“…Another paper has reported that the refluxing of 3‐amido iminocoumarins with benzohydrazide in acetic acid or butanol led not to benzopyranopyrazoles but to N‐substituted iminocoumarin or 3‐substituted coumarin. In continuation of our research on the combination of benzopyran systems with nitrogen‐containing heterocycles , we report in this article an original way for benzopyrano[2,3‐ c ]pyrazoles synthesis based on the treatment of 3‐cyano iminocoumarins by hydrazines or hydrazides under acidic catalyst conditions.…”

Synthesis of New Iminocoumarins Bearing Parabanic Moieties

“…[7,15,16] Reaction of N-ethoxycarbonyl derivatives with amines or hydrazides as N-nucleophiles led to benzopyranopyrimidines, [15,17] whereas hydrazine reagents gave 3-hetaryl coumarins. [18] Bis-iminocoumarins can be obtained by the Schmidt reaction using diamines as reagents. [19] In view of these findings, it appears that a satisfactory combination of coumarinic or iminocoumarinic moieties and nitrogen-containing heterocycle constitutes an original way to develop organic materials of special interest.…”