Palladium-Catalyzed Tandem Dimerization and Cyclization of Acetylenic Ketones: A Convenient Method for 3,3‘-Bifurans Using PdCl<sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub>
作者:Arumugasamy Jeevanandam、Kesavaram Narkunan、Yong-Chien Ling
DOI:10.1021/jo010188k
日期:2001.9.1
Alkynones undergo tandem dimerization and cyclization in the presence of PdCl2(PPh3)2 and triethylamine in tetrahydrofuran at room temperature to give 3,3'-bifurans predominantly. Other palladium catalysts while under similar conditions, by rearrangement, lead to 2,5-disubstituted furans. This distinguished property of PdCl2(PPh3)2 has been attributed to the involvement of hydridopalladium halide.
炔酮在室温下于四氢呋喃中在PdCl2(PPh3)2和三乙胺存在下进行串联二聚和环化反应,主要生成3,3'-双呋喃。其他钯催化剂在类似条件下,通过重排而生成2,5-二取代的呋喃。PdCl2(PPh3)2的这一杰出特性已归因于氢化钯钯的参与。该方法提供了一种简单的途径来制备各种呋喃,并使用易于获得的炔酮进行了多取代3,3'-呋喃的区域选择性合成。