Samarium(III)-Catalyzed C(sp3)-H Bond Activation: Synthesis of Indolizines via C-C and C-N Coupling between 2-Alkylazaarenes and Propargylic Alcohols

A new rare earth metal and samarium-catalyzed C(sp(3))-H bond activation is reported in which 2-alkylazaarenes and propargylic alcohols were converted to indolizines. This process operates under mild conditions and solvent-free conditions. A broad scope of coupling partners has been established, and a likely mechanism has also been suggested.