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Synthesis of 1-substituted 5-aryl-3-(3-coumarinyl)-2-pyrazolines by the reaction of 3-aryl-1-(3-coumarinyl)propen-1-ones with hydrazines

✍ Scribed by Albert Lévai; Jozsef Jekö; D. I. Brahmbhatt

Publisher: Journal of Heterocyclic Chemistry
Year: 2005
Tongue: English
Weight: 89 KB
Volume: 42
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570420633

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✦ Synopsis

Dedicated to Professor Dr. Fritz Sauter on the occasion of his 75 th birthday

1-Acetyl-and 1-propionyl-2-pyrazolines 11-27 have been synthesized by the reaction of (3coumarinyl)chalcones 1-10 with hydrazine in hot acetic acid or propionic acid. While 5-aryl-3-(3coumarinyl)-1-phenyl-2-pyrazolines 28-35 have been prepared by the reaction of (3-coumarinyl)chalcones 1,3,5-10 with phenylhydrazine in hot pyridine. Structures of all new compounds have been elucidated by microanalyses, 1 H and 13 C nmr spectroscopies.

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