Reaction of Aryl and Heterocyclylhydrazines with 2-Methylchromone: Structural Investigation of the Products
作者:Shiv P Singh、Dalip Kumar、Devinder Kumar
DOI:10.1080/00397919608004628
日期:1996.9
Reaction of 2-methylchromone (2) with phenylhydrazine provides 3-methyl-5-(o-hydroxyphenyl)-1-phenylpyrazole (6) as a major product. In contrast under similar conditions, heterocyclhydrazines (8a-c) yield exclusively 5-ethyl-3-(o-hydroxyphenyl)-1-heterocyclylpyrazoles (9a-c). The structural assignments are based on an unambiguous synthesis and an analysis of NMR (H-1 & C-13) spectral data,