Pd-Catalyzed Redox-Neutral C-N Coupling Reaction of Iminoquinones with Electron-Deficient Alkenes without External Oxidants: Access of Tertiary ()-Enamines and Application to the Synthesis of Indoles and Quinolin-4-ones.

A novel and efficient reductive -alkenylation of iminoquinones with electron-deficient olefins has been successfully developed by Pd(II)-catalyzed redox-neutral reactions, which provides a synthesis of tertiary ()-enamines. We further demonstrate that the tertiary enamines can be converted to multifarious -heterocyclic compounds, indoles, and quinolones in good yields.