metabolites. Herein, an efficient and regioselective synthetic strategy for the preparation of functionalized flavones is demonstrated through sequential demethylation/6-endo-dig intramolecular cyclization of propyn-1-ones, using catalytic amounts of base in the presence of a thiol, by employing NMP as the solvent. The reactions proceeded smoothly under transition-metal-free and open to air conditions
黄酮及其类似物是一类重要的
生物和药理活性物质,通常存在于多种植物的组成中,是次级代谢物的一部分。在此,通过在
硫醇存在下使用催化量的碱,通过使用
NMP作为溶剂。反应在无过渡
金属和开放空气条件下顺利进行,在较短的反应时间内以中等至优异的产率提供所需的六元杂环。