Five- and Six-Membered Nickelacyclic Carboxylates as Reagents for the Facile Synthesis of δ-Ketocarboxylic Acids, Isocoumarins, and 1,3-Dicarbonyl Derivatives of Benzoic Acid
Five- and Six-Membered Nickelacyclic Carboxylates as Reagents for the Facile Synthesis of δ-Ketocarboxylic Acids, Isocoumarins, and 1,3-Dicarbonyl Derivatives of Benzoic Acid
The nickelacyclic carboxylates A and B reacted with α-halo ketones to form α,β-unsaturated δ-ketocarboxylic acids which were easily converted into pyranones or isocoumarins. In addition, reaction of the nickelacyclic acyl derivative C with α-halo ketones resulted in the formation of substituted 1,3-dicarbonyl compounds with a benzoic acid substituent in the 1-position. In these reactions, many functional groups were tolerated.