An investigation of structure-reactivity relationships of δ-alkenyl oximes; competitive thermal reactions leading to cyclic nitrones and/or N-unsubstituted bicyclic isoxazolidines

Hetero Cope-Type Hydroamination of Hetero-Allenes with Oximes Having Olefin Moieties Leading to Nitrones, Causing Intramolecular Cycloaddition

Hetero-allenes such as isocyanates, isothiocyanates, and carbodiimides reacted with oxime having olefin moieties in the manner of hetero Cope-type hydroamination to generate N-modified nitrones, which underwent intramolecular cycloaddition to give intramolecular cycloadducts. Among them, the reaction of isocyanates with oximes proceeded at room temperature to provide the corresponding cycloadducts in very high yields. The efficiencies of these sequential cycloadditions were directly compared by competitive reactions. As a result, the order of reactivity to oxime 1a is isocyanate 2a, isothiocyanate 3a, and carbodiimide 6a. Theoretical studies were also conducted.

Introducing topology to assess the synchronicity of organic reactions. Dual reactivity of oximes with alkenes as a case study

Quantum chemical topology analyses provide a new way of understanding the synchronicity of organic reactions.

Revisiting oxime–nitrone tautomerism. Evidence of nitrone tautomer participation in oxime nucleophilic addition reactions

Oxime–nitrone tautomerism takes place through a biomolecular mechanism. Participation of nitrone tautomer in nucleophilic addition reactions is evidenced by the first time.