N-Aryl Tetrahydroisoquinolines as Both Reagents and Substrates for Coupling with Alkyl Halides

-aryl tetrahydroisoquinoline molecule is converted into an iminium intermediate after the XAT event, which functions as an endogenous coupling partner to capture the alkyl radicals, ultimately forming C-C bonds. This transformation proceeds under redox-neutral conditions without external XAT reagents or stoichiometric reductants.