s-Triazinium-based ionic liquid immobilized on silica-coated Fe3O4 magnetic nanoparticles: an efficient and magnetically separable heterogeneous catalyst for synthesis of 2-amino-4,8-dihydropyrano[3,2-b]pyran-3-carbonitrile derivatives for antioxidant and antifungal evaluation studies
method, vibrating sample magnetometery and thermo-gravimetric analysis. These nanoparticles were identified as an efficientcatalyst for one-pot three-component synthesis of 4,8-dihydropyrano[3,2-b]pyran derivatives in excellent yields. The catalyst was easily separated by magnetic decantation, and the recoverednanoparticles were reused for four fresh runs without any significant loss of catalytic activity
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。