Amberlyst 15-Catalyzed Efficient Synthesis of 5-Acetyl-4-hydroxy-coumarone and 5-Acetyl-6-hydroxy-coumarone: Crucial Precursors for Several Naturally Occurring Furanoflavones
作者:Atul Goel、Manish Dixit
DOI:10.1055/s-2004-831180
日期:——
A novel approach to the total synthesis of naturally occurring furanoflavones and furanochalcones is described. Angular and linear furanoflavones and furanochalcones have been prepared in just four steps, using economical reagents and simple reaction conditions. The key step of our approach is the formation of crucial precursors, 5-acetyl-4-hydroxy-coumarone and 5-acetyl-6-hydroxy-coumarone by Amberlyst 15-catalyzed cyclization of phenoxyacetal.
本文描述了一种合成天然存在的呋喃黄酮和呋喃黄酮醌的新方法。角型和线型呋喃黄酮及呋喃黄酮醌仅需四个步骤即可合成,采用经济的试剂和简单的反应条件。我们方法的关键步骤是通过Amberlyst 15催化的苯氧基甲醛环化反应形成重要前体5-乙酰基-4-羟基香豆素和5-乙酰基-6-羟基香豆素。