One-pot synthesis of 2,3-disubstituted benzofurans from 2-chlorophenols using palladium–dihydroxyterphenylphosphine catalyst
作者:Miyuki Yamaguchi、Hayato Ozawa、Haruka Katsumata、Tomoyo Akiyama、Kei Manabe
DOI:10.1016/j.tetlet.2018.07.019
日期:2018.8
2,3-Disubstituted benzofurans possessing 2-hydroxyphenyl moiety at the C-3 position were synthesized from readily available 2-chlorophenols and terminal alkynes by hydroxy-directed ortho-Sonogashira coupling and subsequent oxypalladation/reductive elimination, using Pd-dihydroxyterphenylphosphine catalyst. The catalyst accelerates not only the Sonogashira coupling but also the introduction of 2-hydroxyphenyl
在现有的2-氯苯酚和末端炔烃中,通过羟基定向的邻-Sonogashira偶联反应,随后使用Pd-二羟基叔苯基膦催化剂进行氧化钯/还原消除反应,合成了在C-3位具有2-羟基苯基部分的2,3-二取代苯并呋喃。该催化剂不仅加速了Sonogashira偶联,而且还加速了在苯并呋喃的C-3位上2-羟基苯基的引入。