Kinetics and mechanisms of nucleophilic displacements with heterocycles as leaving groups. 2. N-benzylpyridinium cations: rate variation with steric effects in the leaving group
An iodine-catalyzed aerobicoxidative formal [4+2] annulation for the construction of polyfunctionalized pyridines in one step has been developed through the green reaction system of catalytic amounts of molecular iodine and amine in combination with oxygen. Various ketones and aldehydes were able to react with different chalcones and β, γ-unsaturated α-ketoesters through this reaction strategy. Synthetically