A new reaction of 4-arylidene-3-methylisoxazol-5(4H)-one or 4-arylidene-2-phenyloxazol-5(4H)-one with 2,6-diaminopyrimidin-4(3H)-one is described and a number of new pyrido[2,3-d]pyrimidine-4,7-dione derivatives are synthesized. This protocol has the advantages of good yields, broad substrate scope and simple work-up.
Sulfated polyborate catalyzed expeditious and efficient three-component synthesis of 3-methyl-4-(hetero)arylmethylene isoxazole-5(4H)-ones
作者:Manisha S. Patil、Chirag Mudaliar、Ganesh U. Chaturbhuj
DOI:10.1016/j.tetlet.2017.07.019
日期:2017.8
A rapid and highly efficient methodology for the synthesis of 3-methyl-4-(hetero)arylmethylene isoxazole-5(4H)-ones has been developed using sulfated polyborate as a catalyst. The multicomponent reaction of an aromatic/heterocyclic aldehyde, hydroxylamine hydrochloride, and ethyl acetoacetate under a solvent free condition at 80 °C is described. This protocol has promising features for the reaction
Eucalyptol: An efficient, unexplored, green media for transition metal free synthesis of 2,3-dihydroquinazolin-4(1<i>H</i>)-one derivatives and isoxazolone derivatives
作者:Tandra Kundu、Bijeta Mitra、Pranab Ghosh
DOI:10.1080/00397911.2023.2197118
日期:2023.6.3
suitable temperature. In our present work, we carried out the synthesis of 2,3-dihydroquinazolin-4(1H)-one and isoxazolone derivatives from several aldehydes by using this unexplored but effective eco-benign solvent. The use of this recyclable solvent helped us to avoid the use of hazardous, toxic, and harsh reaction conditions toward the synthesis of different desired heterocyclic systems.
摘要 桉树脑或 1,8-桉树脑,一种生物基单萜,其潜力已被探索为一种可行的替代反应介质,用于开发多种杂环系统。作为一种生态良性溶剂,桉树油已被发现在我们的协议中是一种有前途的、具有生物活性的绿色介质,不允许在合适的温度下参与任何过渡金属催化剂。在我们目前的工作中,我们通过使用这种未开发但有效的生态良性溶剂,从几种醛中合成了 2,3-二氢喹唑啉-4(1 H )-酮和异恶唑酮衍生物。使用这种可回收溶剂帮助我们避免使用危险、有毒和苛刻的反应条件来合成不同的所需杂环系统。
Ionic Liquid-Catalyzed Multicomponent Synthesis of Isoxazole-5(4H)-ones: in vitro Activities and Principal Component Analysis
作者:Yasmine Queiroz、Yasmin de Freitas、Juliana Lima、Luciano Ribeiro、Luciana Ramos
DOI:10.21577/0103-5053.20230188
日期:——
several procedures have been developed to obtain these compounds. The present study aimed to synthesize 17 derivatives of isoxazol-5(4H)-ones using a multicomponent reaction catalyzed by an acidic ionic liquid, which allowed yields from 20-96% of the products. To evaluate the bioactivity of the compounds, the synthesized derivatives were analyzed at various concentrations against bacteria and fungi;
On the Necessity of One-Pot Tautomer Trapping in Asymmetric Michael Reactions of Arylideneisoxazol-5-ones
作者:Antonio Macchia、Valentina Dafnae Cuomo、Antonia Di Mola、Giovanni Pierri、Consiglia Tedesco、Laura Palombi、Antonio Massa
DOI:10.1002/ejoc.202000286
日期:2020.4.23
The issue of the obtaining of complex tautomeric mixtures of 4‐mono‐substituted isoxazol‐5‐ones has been overcome by the use of entrapping reactants in a one‐pot protocols of Michael reactions with arylideneisoxazol‐5‐ones. Asymmetric three components Michael/electrophilic tautomer‐entrapping and four‐component Knoevenagel/Michael/electrophilic‐tautomer‐entrapping methodologies have been developed