Syntheses of some new 1H-pyrazole, pyridazin-3(2H)-one, and oxazin-4-one derivatives

✍ Scribed by Esvet Akbaş; Furgan Aslanoǧlu

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 82 KB
• Volume: 17
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.20170

✦ Synopsis

Abstract

The new 1H‐pyrazole‐3‐carboxylic acid 2, pyridazin‐3(2H)‐one 3, and their various derivatives were prepared by the reactions of the 4‐benzoyl‐5‐phenyl‐2,3‐dihydro‐2,3‐furandione 1 and 2,5‐dichlorophenylhydrazine. Pyrazolo[3,4‐d]pyridazine 7 was obtained from cyclization of the pyrazole‐3‐carboxylic acid 2 with 2,5‐dichlorophenylhydrazine. The reaction of 1 and pyrazole‐3‐carbonitriles 6 gave the new oxazin‐4‐one 9 derivatives. The structures of compounds were characterized on the basis of elemental analyses, mass, IR, ^1^H, and ^13^C NMR spectra. © 2006 Wiley Periodicals, Inc. Heteroatom Chem 17:8–12, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20170