Gold-catalyzed efficient synthesis of 2,4-disubstituted furans from aryloxy-enynes
作者:Ende Li、Wenjun Yao、Xin Xie、Chengyu Wang、Yushang Shao、Yanzhong Li
DOI:10.1039/c2ob07173h
日期:——
(E)-1-aryloxy-1-en-3-ynes has been prepared by Sonogashira coupling of 2-bromo-3-aryloxypropenoates with terminal alkynes using Pd(PPh3)4 and CuI as the catalysts in Et3N. The resulting enynyl-aryl ethers are found to be highly applicable to the synthesis of 2,4-disubstituted furans with an ester group at C-4 position through an Au/Ag-catalyzed annulation reaction under extremely mild reaction conditions.
使用Pd(PPh 3)4和CuI作为Et 3的催化剂,通过Sonogashira将2-溴-3-芳氧基丙酸酯与末端炔烃偶联制备了一系列(E)-1-芳氧基-1-en-3-ynes N.发现所得的炔基-芳基醚非常适用于在极温和的反应条件下通过Au / Ag催化的环化反应合成在C-4位具有酯基的2,4-二取代的呋喃。