作者:Filip R. Petronijevic、Peter Wipf
DOI:10.1021/ja2026882
日期:2011.5.25
indole alkaloid cycloclavine and its unnatural C(5)-epimer are described. Key features include the rapid construction of the heterocyclic core segments by two Diels-Alder reactions. An indole annulation was accomplished by a late-stage intramolecular Diels-Alder furan cycloaddition, and a methylenecyclopropane dienophile was used for a stereoselective intramolecular [4 + 2] cycloaddition to give the c
描述了天然存在的吲哚生物碱环棒麦角素及其非天然 C(5)-差向异构体的新途径。主要特点包括通过两个狄尔斯-阿尔德反应快速构建杂环核心链段。通过后期分子内第尔斯-阿尔德呋喃环加成完成吲哚环化,并使用亚甲基环丙烷亲双烯体进行立体选择性分子内[4 + 2]环加成,得到环棒麦角中存在的环丙[c]吲哚啉结构单元。