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.