Palladium-Catalyzed Intramolecular Hydroarylation of 4-Benzofuranyl Alkynoates. Approach to Angelicin Derivatives
作者:Tsugio Kitamura、Kensuke Otsubo
DOI:10.1021/jo300021a
日期:2012.3.16
Intramolecular hydroarylation of 4-benzofuranyl alkynoates using Pd(OAc)2 as catalyst took place selectively and efficiently, giving angular furocoumarin derivatives in high yields. The parent angelicin was obtained in 80% yield by this method. The starting 4-benzofuranyl alkynoates were easily accessible from readily available 4-hydroxybenzofurans and alkynoic acids.
使用Pd(OAc)2作为催化剂的4-苯并呋喃基烷基炔烃分子内氢芳基化反应选择性且有效地进行,从而以高收率得到了角型呋喃香豆素衍生物。通过这种方法以80%的产率获得了当归素。起始的4-苯并呋喃基炔酸酯可容易地从容易获得的4-羟基苯并呋喃和炔酸获得。