Scheme 2. Scope of pyrrolidines 4 synthesized via redox-enabled hydroamination reaction sequence. Isolated yields shown with ¹H NMR yields using 1,3,5-trimethoxybenzene as an internal standard shown in parentheses. (a) Conditions from Table 1, entry 10; (b) 2.2 equiv. of B₂(OH)₄ was added; (c) isolated as the HCl salt; (d) at 60 °C; (e) 2.2 equiv. of UHP and 3.2 equiv. of B₂(OH)₄ were added.