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On the reaction of 3-cyanochromones with phenyl- and methylhydrazines: Structural revision and a simple synthesis of chromeno[4,3-c]pyrazol-4-ones

✍ Scribed by Vyacheslav Ya. Sosnovskikh; Vladimir S. Moshkin; Mikhail I. Kodess

Publisher
Journal of Heterocyclic Chemistry
Year
2010
Tongue
English
Weight
113 KB
Volume
47
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

magnified image Reactions of 3‐cyanochromones with phenylhydrazine gave the corresponding 5‐amino‐4‐salicyloyl‐1‐phenylpyrazoles, 2‐aminochromone‐3‐carbaldehyde N‐phenylhydrazones, and 1‐phenylchromeno[4,3‐c]pyrazol‐4(1__H__)‐one, depending on the reaction conditions. With methylhydrazine, 3‐(2‐hydroxyaryl)‐1‐methylpyrazole‐4‐carbonitriles and 2‐methylchromeno[4,3‐c]pyrazol‐4(2__H__)‐ones were obtained in moderate to high yields. J. Heterocyclic Chem., (2010).

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