Iron-Catalyzed Aminolysis of β-Carbonyl 1,3-Dithianes: Synthesis of Stereodefined β-Enaminones and 3,4-Disubstituted Pyrazoles

A novel iron-catalyzed aminolysis of beta-carbonyl 1,3-dithianes with various amines including ammonia, primary and secondary amines, as well as hydrazine hydrate has been developed, leading to the synthesis of steleodefined beta-enaminones and 3,4-disubstituted pyrazoles in good to high yields.