Cu(I)-Catalyzed Domino Reactions: Efficient and Selective Synthesis of 4<i>H</i>-Chromenes and Naphthalenes
作者:Chandi C. Malakar、Dietmar Schmidt、Jürgen Conrad、Uwe Beifuss
DOI:10.1021/ol200347g
日期:2011.4.15
Depending on the ratio of the substrates and the reaction conditions, the Cu(I)-catalyzed domino reaction between bromobenzyl bromides and beta-ketoesters exclusively yields either 4H-chromenes or naphthalenes.
Copper(I)-Catalyzed Intramolecular O-Arylation for the Synthesis of 2,3,4,9-Tetrahydro-1<i>H</i>-xanthen-1-ones with Low Loads of CuCl
作者:Kavitha Sudheendran、Chandi C. Malakar、Jürgen Conrad、Uwe Beifuss
DOI:10.1021/jo3018318
日期:2012.11.16
As little as 0.5 mol % CuCl is sufficient to catalyze the intramolecular O-arylation of easily accessible 2-(2-bromobenzyl)cyclohexane-1,3-diones to provide the corresponding 2,3,4,9-tetrahydro-1H-xanthen-1-ones with yields ranging from 83% to 99%.