Effects of temperature and concentration in some ring closing metathesis reactions
作者:Kana Yamamoto、Kaustav Biswas、Christoph Gaul、Samuel J. Danishefsky
DOI:10.1016/s0040-4039(03)00618-x
日期:2003.4
Ring closing metathesis (RCM) has emerged as a powerful tool to construct macrocyclic ring systems. However, the product distribution of monomer and oligomers is often a problem in the formation of medium to large rings. In the course of synthetic studies on the natural product radicicol and its analogs, we have found that the reaction temperature, along with concentration, has significant impact on
闭环置换(RCM)已经成为构建大环系统的强大工具。然而,单体和低聚物的产物分布在中至大环的形成中通常是一个问题。在对天然产物radicicol及其类似物的合成研究过程中,我们发现反应温度以及浓度对产物比率的结果有重大影响。具体而言,在回流的甲苯(110℃)中以更高的稀释度进行RCM反应提供了单体大环化合物的提高的产率。也报道了另一类大内酯天然产物埃博霉素的类似观察结果。