tailieunhanh - Three-component reactions of kojic acid: Efficient synthesis of Dihydropyrano[3,2-b]chromenediones and aminopyranopyrans catalyzed with Nano-Bi2O3-ZnO and Nano-ZnO

Synthesis of pyrano-chromenes and pyrano-pyrans was developed by three-component reactions of kojic acid and aromatic aldehydes with dimethone and malononitrile, catalyzed with nano-Bi2O3-ZnO and nano-ZnO, respectively. | Three-component reactions of kojic acid Efficient synthesis of Dihydropyrano 3 2-b chromenediones and aminopyranopyrans catalyzed with Nano-Bi2O3-ZnO and Nano-ZnO Current Chemistry Letters 6 2017 105 116 Contents lists available at GrowingScience Current Chemistry Letters homepage Three-component reactions of kojic acid Efficient synthesis of Dihydropyrano 3 2-b chromenediones and aminopyranopyrans catalyzed with Nano-Bi2O3-ZnO and Nano-ZnO Maryam Ziraka Mostafa Azinfara and Mosleh Khalilia a Department of Chemistry Payame Noor University Iran CHRONICLE ABSTRACT Article history Synthesis of pyrano-chromenes and pyrano-pyrans was developed by three-component Received January 2 2017 reactions of kojic acid and aromatic aldehydes with dimethone and malononitrile catalyzed Received in revised form with nano-Bi2O3-ZnO and nano-ZnO respectively. Reactions proceeded smoothly and the March 1 2017 corresponding heterocyclic products were obtained in good to high yields. Nano ZnO and nano Accepted April 21 2017 Bi2O3-ZnO were prepared by sol-gel method and characterized by X-ray diffraction XRD Available online energy-dispersive X-ray analysis EDX Fourier transform infrared FT-IR scanning electron April 22 2017 microscopy SEM and transmission electron microscopy TEM techniques. Supporting Bi3 Keywords on ZnO nanoparticles as Bi2O3 is the main novelty of this work. The simple reaction Kojic acid Heterogeneous catalysis procedure easy separation of products low catalyst loading reusability of the catalyst are Multicomponent reaction some advantageous of this protocol. Solvent-free Nano-ZnO 2017 Growing Science Ltd. All rights reserved. 1. Introduction Multi-component reactions MCRs have been attracted a lot of attention in organic and pharmaceutical chemistry because of the construction of biologically active Although these reactions are complicated than stepwise reaction they are fast efficient and environmentally favorable methods. .

• Hoá học
• Three component reactions
• Synthesis of pyrano chromenes
• Kojic acid and aromatic aldehydes
• Nano Bi2O3 ZnO
• X ray analysis