Synthesis of 3‐Arylindole‐2‐carboxylates via Copper‐Catalyzed Hydroarylation of o‐Nitrophenyl‐Substituted Alkynoates and Subsequent Cadogan Cyclization
2011
A two-step route to biologically important 3-arylindole-2-carboxylic esters has been successfully established: o-nitrophenyl-substituted alkynoates underwent copper-catalyzed hydroarylation in the presence of commercially available arylboronic acids to afford 3,3-diarylacrylates, which were then converted to indolecarboxylates via a modified Cadogan cyclization using a molybdenum catalyst and triphenylphosphine.
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