Recyclization of 2-imino-2H-1-benzopyrans under the influence of nucleophilic reagents. 1. New approach to the synthesis of 3-(1,3,4oxadi-, thiadi-, and triazolyl-2)coumarins

Abstract

It has been found that under the action of hydrazides of carboxylic acids, 2-iminocoumarin-3-carboxamides are recyclized to N⁽¹⁾-acylamidrazones of coumarin-3-carboxylic acids. The use of N⁽¹⁾-acylamidrazones is proposed as a simple and effective means of synthesizing 3-(1,3,4-oxadi-, thiodi-, and triazolyl-2)coumarins. The possibilities of alternate schemes of synthesis are discussed, and a mechanism is suggested for the recyclization.

How to Cite
Kovalenko, S. N.; Zubkov, V. A.; Chernykh, V. P.; Turov, A. V.; Ivkov, S. M. Chem. Heterocycl. Compd. 1996, 32, 163. [Khim. Geterotsikl. Soedin. 1996, 186.]

For this article in the English edition, see DOI https://doi.org/10.1007/BF01165439