Synthesis of Furo[2,3-<i>b</i>]pyran-2-ones through Ag(I)- or Ag(I)–Au(I)-Catalyzed Cascade Annulation of Alkynols and α-Ketoesters
作者:Sagar S. Thorat、Priyanka Kataria、Ravindar Kontham
DOI:10.1021/acs.orglett.7b04027
日期:2018.2.2
Ag(I)- or Ag(I)–Au(I)-catalyzed cascade annulation of alkynols (5-hexyn-1-ol systems) with α-ketoesters involving a dual activation process (π and σ) has been developed for the first time. This reaction proceeds through cycloisomerization of alkynol to give the 6-endo-enol ether followed by annulation with an α-ketoester to furnish furo[2,3-b]pyran-2-ones in good yields. Chemical structures of all
已经开发了Ag(I)-或Ag(I)-Au(I)催化的炔烃(5-己炔-1-醇系统)与α-酮酸酯的级联环化反应,涉及双活化过程(π和σ)。第一次。该反应通过炔醇的环异构化进行,得到6-内-烯醇醚,然后用α-酮酸酯环化,以良好的产率提供呋喃[2,3 - b ]吡喃-2-酮。所有产品的化学结构均通过单晶X射线分析和类似物严格确认。