Synthesis of (E)-2-Styrylchromones and Flavones by Base-Catalyzed Cyclodehydration of the Appropriate β-Diketones Using Water as Solvent
作者:Joana Pinto、Vera Silva、Ana Silva、Artur Silva
DOI:10.3390/molecules200611418
日期:——
A low cost, safe, clean and environmentally benign base-catalyzed cyclodehydration of appropriate β-diketones affording (E)-2-styrylchromones and flavones in good yields is disclosed. Water was used as solvent and the reactions were heated using classical and microwave heating methods, under open and closed vessel conditions. β-Diketones having electron-donating and withdrawing substituents were used to evaluate the reaction scope. The reaction products were isolated in high purity by simple filtration and recrystallization from ethanol, when using 800 mg of the starting diketone under classical reflux heating conditions.
本文公开了一种低成本、安全、清洁且环保的碱性催化环脱氢反应,该反应以合适的β-二酮为原料,可获得高收率的(E)-2-苯乙烯基色原酮和黄酮。以水为溶剂,在开式和闭式反应条件下,采用传统加热法和微波加热法加热。具有电子供体和电子受体取代基的β-二酮可用于评估反应范围。在传统回流加热条件下,使用800mg起始二酮,通过简单的过滤和乙醇重结晶,可以得到高纯度的反应产物。