9-Membered Carbocycle Formation: Development of Distinct Friedel-Crafts Cyclizations and Application to a Scalable Total Synthesis of (±)-Caraphenol A
作者:Nathan E. Wright、Scott A. Snyder
DOI:10.1002/anie.201311299
日期:2014.3.24
9‐membered carbocycle formation have afforded the first reported example of a 9‐exo‐dig ring closure via a AuIII‐promoted reaction between an alkyne and an aryl ring as well as several additional, unique Friedel–Crafts‐type cyclizations. Analyses of the factors leading to the success of these transformations are provided, with the application of one of the developed 9‐membered ring closures affording
对一系列不同的 9 元碳环形成方法的探索提供了第一个报道的 9- exo- dig 闭环例子,通过 Au III促进的炔和芳环之间的反应以及几个额外的、独特的弗里德尔–工艺型环化。提供了导致这些转化成功的因素的分析,其中一个开发的 9 元环闭合的应用提供了生物活性白藜芦醇三聚体卡拉酚 A 的有效和可扩展的合成。该合成的平均产量为 89每步 %(总产率 7.8%),并提供了对超过 600 mg 目标分子的访问。