Alternate Synthesis Route of 2-(Substituted Phenyl)-3,3a-dihydro-8H-pyrazolo[5,1-<i>a</i>]isoindol-8-ones via Chalcone-Based N-Formyl-pyrazolines
作者:Naseem Ahmed、Dharm Dev
DOI:10.1080/00397911.2011.606414
日期:2013.1.1
Abstract An alternate approach to 2-(substituted phenyl)-3,3a-dihydro-8H-pyrazolo[5,l-a] isoindol-8-ones via chalcone-based N-formyl-pyrazolines is described. N-Formyl-pyrazolines were prepared in excellent yield (81–96%) by the reaction of chalcones with hydrazine hydrate in the presence of formic acid, which undergoes intramolecular Friedel–Crafts acylation in the presence of trifluoroacetic acid