Scheme 2.

Scope of alkynes for 1,2‐carboboration with 1‐iodobutane and B₂pin₂. [a] Reaction conditions: 1 (0.5 mmol), 2a (2 equiv), 3a (1.5 equiv), NaO ^t Bu (1.5 equiv), CuCl@POL‐NHC‐Ph (20 mg, 4.67 wt.% Cu), DMF (0.25 M), 60°C, 7 h. Isolated yield. The value of β‐[B]:α‐[B] was determined by ¹H NMR. [b] Room temperature. [c] 1 Equiv B₂pin₂. [d] The reaction time was 12 h.