Application of Dearomatization Strategy on the Synthesis of Furoquinolinone and Angelicin Derivatives
作者:Yang Ye、Li Zhang、Renhua Fan
DOI:10.1021/ol300648t
日期:2012.4.20
The oxidative dearomatization of 3-(3-alkynyl-4-hydroxyphenyl)propanoic acid is combined with a cascade transition-metal catalyzed cyclization/addition/aromatization/lactamization sequence, which provides a novel approach to prepare furoquinolinone and angelicin derivatives in a convergent and efficient manner.
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
Intramolecularhydroarylation 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.