在本文中,描述了2-和3-取代的苯并[ b ]呋喃的完全区域控制的合成。在中性氧化铝存在下,苯酚与α-溴乙酰苯之间的直接反应生成具有完全区域控制能力的2取代的苯并[ b ]呋喃。当使用碱性盐如碳酸钾时,获得了相应的2-氧代醚。由中性氧化铝促进的这些后面化合物的环化产生相应的3-取代的苯并[ b ]呋喃。使用前一种方法,可以在两个制备步骤中从商业来源获得Moracin M和其他类似物。DFT计算提供了合理的反应路径,以了解2-取代的苯并[ b ]呋喃的形成。
A New Synthetic Route of 2-Aroyl- and 2-Benzyl-Benzofurans and their Application in the Total Synthesis of a Metabolite Isolated from Dorstenia gigas
作者:Christian Correa、María del Carmen Cruz、Fabiola Jiménez、L. Gerardo Zepeda、Joaquín Tamariz
DOI:10.1071/ch08243
日期:——
regioselective and short synthesis of 2-aroylbenzofurans 2a–h. The Wolff–Kishner reduction of the latter yielded a series of substituted 2-benzylbenzofurans 3a–h. This methodology was applied in the first totalsynthesis of the metabolite 2-(4-hydroxybenzyl)-6-methoxybenzofuran 1, which was isolated from the tropical plant Dorstenia gigas, and obtained through a six-step route and in a 24% overall yield