The intramolecular Diels-Alder cycloaddition of N-dienoyl acrylimidates. An efficient approach for the synthesis of hexahydroisoquinolones and hexahydroisoindolones
Methodology for Regioselective Synthesis of Substituted Pyridines via Intramolecular Oximino Malonate Hetero Diels−Alder Reactions
摘要:
Various substituted pyridines can be prepared regioselectively by a sequence involving an intramolecular thermal or high pressure Diels-Alder cycloaddition of an oximino malonate dienophile tethered to a dienic carboxylic acid, followed by mild aromatization of the resulting cycloadduct with cesium carbonate in DMF at room temperature.