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 Sonogashiracoupling 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.