Scheme 5. Control reactions. Reaction conditions: 1,5-conjugated enyne (1h, 0.25 mmol), tosylhydrazide (2a, 0.50 mmol), TBAI (0.05 mmol), Cu(OAc)2 (0.0125 mmol), PivOH (0.50 mmol), BPO (1.0 mmol), CH3CN (2.5 mL), 100 °C, 12 h.
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