Efficient and Functional-Group-Tolerant Synthesis of Substituted Furans through the Pd-Catalyzed 5-<i>exo</i>
-<i>dig</i>
Cyclization/Coupling of γ-Acetylenic β-Keto Esters with (Hetero)Aryl Bromides
作者:Agata Kołodziejczyk、Wojciech Chaładaj
DOI:10.1002/ejoc.201800046
日期:2018.6.7
We report an efficient protocol for the synthesis of 2,3,5‐trisubstituted furans through the reaction of readily available γ‐acetylenic β‐keto esters with aryl and heteroaryl bromides. The reaction, which involves a 5‐exo‐dig cyclization, coupling, and isomerization of a double bond, proceeds smoothly with very low catalyst loading (0.1 mol‐%), and shows excellent functional‐group tolerance.
我们报告了一种通过易于获得的γ-炔烃β-酮酯与芳基和杂芳基溴化物反应来合成2,3,5-三取代呋喃的有效方案。反应,其涉及5-外型-挖一个双键的环化,耦合,和异构化,以非常低的催化剂负载量(0.1摩尔%),并显示出优异的官能团耐受性可顺利地进行。