Scheme 3. (A) Impact of the n-Bu₃N stoichiometry on the radical coupling between 1 and 2. (B) Radical couplings via EDA. (C) Computational studies on key properties of α-aminoalkyl radical (B1) and extended aminoalkyl radical (E2) and the thermodynamic feasibility of the chain propagation step. PMP = p-OMe-C₆H₄.