Biomimetic Total Synthesis of Clavicipitic Acid: A DDQ-Mediated Intramolecular Cross-Dehydrogenative Coupling Approach
作者:Kuei-Wei Chiu、Yu-Hsun Tseng、Ying-Xin Li、Rong-Jie Chein
DOI:10.1021/acs.orglett.3c01029
日期:2023.5.19
acid, a communesin alkaloid precursor, has attracted significant attention due to its unique azepino[5,4,3-cd]indole framework. Herein, we report a novel biomimetic synthesis of clavicipitic acid diastereomers by utilizing a DDQ-mediated cross-dehydrogenative coupling (CDC) reaction. The synthesis involves Suzuki coupling for the prenylation of a 4-bromotryptophan derivative, followed by an intramolecular
Clavicipitic acid 是一种 communesin 生物碱前体,由于其独特的 azepino[5,4,3-cd] 吲哚骨架而备受关注。在此,我们通过利用 DDQ 介导的交叉脱氢偶联 (CDC) 反应报告了克拉维酸非对映异构体的新型仿生合成。该合成涉及铃木偶联以对 4-溴色氨酸衍生物进行异戊烯化,然后进行分子内 CDC 反应以构建氮杂吲哚核心。反式异构体作为主要产物获得,并且两种非对映异构体是可分离的。研究了 CDC 反应条件,包括温度、溶剂和保护基团,并提出了观察到的非对映选择性的合理机制。