Synthesis and characterization of pyridine-4-carboxylic acid functionalized Fe3O4 nanoparticles as a magnetic catalyst for synthesis of pyrano[3,2-b]pyranone derivatives under solvent-free conditions
作者:Sakineh Asghari、Majid Mohammadnia
DOI:10.1007/s11164-015-2124-0
日期:2016.3
Pyridine-4-carboxylic acid (PYCA) functionalized Fe3O4 nanoparticles as an organic–inorganic hybrid heterogeneous catalyst was fabricated and characterized by FT-IR, XRD, TGA, TEM, SEM, and VSM techniques. The catalytic activity of the magnetic catalyst was probed through one-pot synthesis of pyrano[3,2-b]pyranone derivatives from three component reactions of aromatic aldehydes, kojic acid, and ethyl cyanoacetate under solvent-free conditions. Some advantages of this protocol are its environmentally benign method, simple procedure, high yields, and short reaction time. The catalyst was readily separated using an external magnet and reusable without significant loss of its catalytic efficiency.
AbstractPyrano[3,2-b]pyranones are prepared in good yields from three-component coupling of kojic acid, ethylcyanoacetate, and benzaldehydes in aqueous K2CO3. The synthetic compounds exert moderate activity against both Gram positive and Gram negative bacteria and their effectiveness is higher against Bacillus subtilis. Graphical abstract
摘要由曲酸,氰基乙酸乙酯和苯甲醛在K 2 CO 3水溶液中的三组分偶联可高产率制备吡喃并[3,2- b ]吡喃酮。合成的化合物对革兰氏阳性和革兰阴性菌均具有中等活性,对枯草芽孢杆菌的有效性更高。 图形概要
SYNTHESIS OF NEW CONDENSED 2-AMINO-4H-PYRAN-3-CARBONITRILES AND OF 2-AMINOQUINOLINE-3-CARBONITRILES
作者:Saleh M. Al-Mousawi、Yehia M. Elkholy、Mohammad A. Mohammad、Mohammad H. Elnagdi
DOI:10.1080/00304949909458324
日期:1999.6
Convenient synthesis of amino-substituted pyranopyranones
作者:Ming-Zhu Piao、Kimiaki Imafuku
DOI:10.1016/s0040-4039(97)01184-2
日期:1997.7
Treatment of kojic acid and triacetic acid lactone with arylmethylenemalononitrile derivatives in the presence of piperidine in ethanol, respectively, furnished the corresponding amino-substituted new 4H,8H-pyrano[3,2-b]pyran-4-ones and 4H,5H-pyrano[4,3-b]pyran-5-ones in high yields.
在乙醇中存在哌啶的情况下分别用芳基亚甲基丙二腈衍生物处理曲酸和三乙酸内酯,提供了相应的氨基取代的新的4 H,8 H-吡喃并[3,2- b ]吡喃-4-酮和4 H,5 H-吡喃并[4,3 - b ]吡喃-5-酮,收率高。