Synthesis of Fused Tricyclic Amines Bearing Tetrasubstituted Carbons Using an Alkylation–Cyclization–Isomerization–3-aza-Cope Cascade Reaction
作者:Takeo Sakai、Tomoki Furuhata、Kota Hosoe、Kaho Umemura、Yuji Mori
DOI:10.1021/acs.orglett.3c00778
日期:2023.5.5
A new cascade reaction sequence that involves alkylation, cyclization, isomerization, and 3-aza-Cope rearrangement was discovered. The stereogenic centers of the starting piperidines were transferred to the bicyclic enamine products, and a range of electron-withdrawing groups on the alkyne moieties, from ketones to amides, were tolerated under the reaction conditions. The bicyclic enamines underwent
发现了涉及烷基化、环化、异构化和 3-aza-Cope 重排的新级联反应序列。起始哌啶的立体异构中心被转移到双环烯胺产物上,并且在反应条件下可以容忍炔烃部分上的一系列吸电子基团,从酮到酰胺。双环烯胺经过三氟乙酸 (TFA) 介导的环化形成带有四取代碳的三环胺。