Table 1. Effect of the Ligand in the Copper-Catalyzed Borylation.

entrya	L	2a:3ab	yield (%)c
1	L1	65:35	71
2	L2	50:50	84
3	L3	≥98:2	86
4	L4	83:17	58
5	L5	64:36	79
6	L6	73:27	69
7d	L3	≥98:2	69
8	—	60:40	13

^aReaction conditions: 1a (0.1 mmol), B₂pin₂ (0.11 mmol), KOt-Bu (0.5 equiv), CuCl (10 mol %), L (11 mol %), MeOH (0.2 mmol), THF (0.2 M).

^bDetermined by ¹H NMR.

^cIsolated yields.

^dWith 5 mol % of CuCl and 6 mol % of L₃.