Cu(I)-Catalyzed Domino Reactions: Efficient and Selective Synthesis of 4H-Chromenes and Naphthalenes
摘要:
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.
Cu(i)-catalyzed annulation for the synthesis of substituted naphthalenes using o-bromobenzaldehydes and β-ketoesters as substrates
作者:Chandi C. Malakar、Kavitha Sudheendran、Hans-Georg Imrich、Sabine Mika、Uwe Beifuss
DOI:10.1039/c2ob06963f
日期:——
Cu(I)-catalyzed reaction of o-bromobenzaldehydes with β-ketoesters using Cs2CO3 as a base and 2-picolinic acid as an additive proceeds under mild conditions and gives access to substituted naphthalenes in a single step with yields ranging from 71 to 86%. The new annulation process relies on a domino Knoevenagel condensation/C-arylation/1,2-addition/carboxylic acid cleavage. The annulation can also be achieved with o-iodobenzaldehyde.
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.