On the Synthesis of Zwitterionic Heteropolycyclic Pyrazoles by a Three-Component Reaction. Some Mechanistic Considerations

Article abstract of DOI:10.1021/jo00093a033

The novel three-component reaction involving a heterocyclic iminophosphorane, an isocyanate, and a hetarene component is applied to an aromatic pyrazole iminophosphorane 1 and to an analogous pyrazolone derivative 13.The hitherto unknown zwitterionic pyra