An efficient solvent-free synthesis of isoxazolyl-1,4-dihydropyridines on solid support SiO2 under microwave irradiation
作者:Dawei Zhang、Xiaodong Chen、Xue Guo、Yumin Zhang、Yaya Hou、Tianqi Zhao、Qiang Gu
DOI:10.1007/s00706-016-1657-2
日期:2016.9
AbstractAn efficient synthesis of 1,4-dihydropyridines was developed. 1,4-Dihydropyridines were synthesized starting from various 3-substituted isoxazolyl-5-carbaldehydes, ethyl acetoacetate, and ammonium acetate under microwave irradiation and solvent-free conditions (86–96 %), and were characterized by HRMS, FT-IR, 1H NMR, and 13C NMR spectroscopy. Solid support SiO2 was found to possess favorable
摘要开发了1,4-二氢吡啶的有效合成方法。在微波辐射和无溶剂条件下(86-96%),由各种3-取代的异恶唑基-5-甲醛,乙酰乙酸乙酯和乙酸铵开始合成1,4-二氢吡啶,并通过HRMS,FT-IR,1 H NMR和13 C NMR光谱。发现固体载体SiO 2具有用于缩合反应的有利的催化和分散性。该方法的优点包括环境友好的反应条件,简单的操作,广泛的底物,良好的收率和SiO 2的再利用。此外,在正交Pbca空间基团中给出了化合物4- [3-(2-(甲氧基苯基)异恶唑-5-基] -2,6-二甲基-1,4-二氢吡啶-3,5-二羧酸二乙酯的晶体结构。 图形概要