The reaction of 2'-hydroxychalcone dibromides 1 or α-bromo-2'-hydroxychalcones 15 with sodium azide resulted in a mixture of α-azido-2'-hydroxychalcones 2, 3-aryl-5-(2-hydroxy-pheny)isoxazoles 3, flavones 4, aurones 5 and 4-aryl-5-(2-hydroxybenzoyl)-1,2,3-triazoles 6. The product ratio was strongly influenced by the character of the substituent at position C-4. Similar results were obtained with 2
converted into the corresponding isoxazole and pyrazole derivatives upon their reaction with hydroxylamine hydrochloride or hydrazine hydrate, respectively. Structures of the compounds were confirmed by spectroscopic methods. All synthesized compounds were tested for antioxidant and antibacterial potential. Some of those demonstrated excellent antioxidantactivity, and one product was identified as
β-Cyclodextrin (β-CD) as a Supramolecular Catalyst for the Synthesis of Isoxazoles and Thiopyrimidines and their Antimicrobial Screening
作者:Asha Chate、Charansingh Gill
DOI:10.2174/1570178614666161230124807
日期:2017.3.9
anticonvulsant activities. Herein we report the synthesis of isoxazole and thiopyrimidine by the reaction of ring opening of 2-arylchromones with hydroxylamine hydrochloride and thiourea, using β-cyclodextrin as a reusable catalyst under supramolecular catalysis, for the first time in aqueous media Methods: The β-Cyclodextrin catalyzed synthesis of isoxazole and thiopyrimidine derivatives by the reaction