Table 2. Substrate scope of 1,3-enynes a .
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aReaction conditions: 1 (0.2 mmol, 1 equiv.), 2 (0.3 mmol, 1.5 equiv.), 3a (0.6 mmol, 3 equiv.), Cu(CH3CN)4BF4 (5 mol%), ligand (7 mol%), DIPEA (0.6 mmol, 3 equiv.), THF (1 mL), rt.
bYield after deprotection of the TMS ether in situ.
cThe dr value was determined by GC-MS analysis.