Highly Efficient Formal [2+2+2] Strategy for the Rapid Construction of Polycyclic Spiroindolines: A Concise Synthesis of 11‐Demethoxy‐16‐
<i>epi</i>
‐myrtoidine
作者:Jun Zhu、Yu‐Jing Cheng、Xiao‐Kang Kuang、Lijia Wang、Zhong‐Bo Zheng、Yong Tang
DOI:10.1002/anie.201603991
日期:2016.8
the stereoselective elaboration of polycyclic indole alkaloids is described. Upon treatment with the catalyst InCl3 (5 mol %), tryptamine‐derived enamides reacted readily with methylene malonate, thus enabling rapid and gram‐scale access to versatile tetracyclic spiroindolines with excellent diastereoselectivity (21 examples, up to 95 % yield, up to d.r.>95:5). This strategy provides a concise approach
描述了一种新的正式的[2 + 2 + 2]策略,用于多环吲哚生物碱的立体选择性修饰。用催化剂InCl 3(5 mol%)处理后,色胺衍生的酰胺容易与丙二酸亚甲基酯反应,因此能够以快速的克级数获得具有优异的非对映选择性的通用四环螺二吲哚啉(21个实例,产率高达95%,高达博士> 95:5)。这种策略为分离自马兜铃中的生物碱提供了一种简洁的方法,如11- demethoxy -16- epi - myrtoidine的短合成所证明的。