Catalyst‐ and Reagent‐Free Formal Aza‐Wacker Cyclizations Enabled by Continuous‐Flow Electrochemistry
作者:Chong Huang、Zhao‐Yu Li、Jinshuai Song、Hai‐Chao Xu
DOI:10.1002/anie.202101835
日期:2021.5.10
materials. Herein we disclose a catalyst‐ and reagent‐free formal aza‐Wacker type cyclization reaction for the synthesis of functionalized saturated N‐heterocycles. Key to the success is to conduct the reactions in a continuous‐flow electrochemical reactor without adding supporting electrolyte or additives. The reactions are characterized by broad tolerance of di‐, tri‐ and tetrasubstituted alkenes.
由于天然产物和生物活性化合物中普遍存在这些结构,因此开发有效且可持续的方法以获取饱和N-杂环极为重要。Pd催化的aza-Wacker型环化是一种有效的方法,它提供了带有烯烃部分的N-杂环的通道,该环可从现成的材料中进行进一步的合成操作。在此,我们公开了用于合成功能化饱和N杂环的无催化剂和无试剂的正式Aza-Wacker型环化反应。成功的关键是在连续流电化学反应器中进行反应,而无需添加辅助电解质或添加剂。反应的特点是对二,三和四取代烯烃具有宽泛的耐受性。