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Synthesis of N1-substituted coumarino[4,3-c] pyrazoles

✍ Scribed by Milan Čačič; Mladen Trkovnik; Elizabeta Has-Schön

Publisher
Journal of Heterocyclic Chemistry
Year
2003
Tongue
English
Weight
42 KB
Volume
40
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

3‐Acyl‐4‐hydroxy‐2‐oxo‐2__H__‐chromen derivatives 1a‐d were condensed with (7‐hydroxy‐2‐oxo‐2__H__‐chromen‐4‐yl)‐acetic acid hydrazide 2, (4‐methyl‐2‐oxo‐2__H__‐chromen‐7‐yloxy)‐acetic acid hydrazide 3, and (7‐hydrazinocarbonylmethoxy‐2‐oxo‐2__H__‐chromen‐4‐yl)‐acetic acid hydrazide 4, to give corresponding 3‐alkyl‐1‐[2‐(7‐hydroxy‐2‐oxo‐2__H__‐chromeno‐4‐yl)‐acetyl]‐1__H__‐chromeno[4,3‐c]pyrazole‐4‐one 5a‐d, 3‐alkyl‐1‐[2‐(4‐methyl‐2‐oxo‐2__H__‐chromeno‐7‐yloxy)‐acetyl]‐1__H__‐chromeno[4,3‐c]pyrazole‐4‐one 6a‐d, and 1‐{4‐[(3‐alkyl‐1__H__‐chromeno[4,3‐c]pyrazole‐4‐one‐1‐yl)‐carbonylmethyl]‐2‐oxo‐2__H__‐chromen‐7‐yloxy‐acetyl}‐3‐alkyl‐1__H__‐chromeno[4,3‐c]pyrazole‐4‐one 7a‐d.

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