Brønsted Acid-Catalyzed Highly Stereoselective Arene-Ynamide Cyclizations. A Novel Keteniminium Pictet−Spengler Cyclization in Total Syntheses of (±)-Desbromoarborescidines A and C
作者:Yanshi Zhang、Richard P. Hsung、Xuejun Zhang、Jian Huang、Brian W. Slafer、Allison Davis
DOI:10.1021/ol0473391
日期:2005.3.1
[reaction: see text] A Bronsted acid-catalyzed highly stereoselective arene-ynamide cyclization is described. These reactions constitute a keteniminium variant of Pictet-Spengler cyclizations, leading to efficient synthesis of nitrogen heterocycles and related alkaloids. Total syntheses of desbromoarborescidines A and C are illustrated here as first applications of this methodology.
[反应:见正文]描述了布朗斯台德酸催化的高度立体选择性的芳烃-氨酰胺环化反应。这些反应构成了Pictet-Spengler环化的酮亚胺变体,导致氮杂环和相关生物碱的有效合成。脱溴阿糖胞苷A和C的总合成作为该方法的首次应用在此处说明。