Table 4.
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Experiments were performed with substrate 1a (0.10 mmol), Pd(OAc)2 (0.01 mmol), TDG (0.075 mmol), N-fluoro 2,4,6-methylpyridinium tetrafluoroborate (0.20 mmol), HFIP (0.5 mL), 70 °C, 16 h.
Isolated yields.
Reaction performed with 0.5 eq of TDG.
Reaction performed with 2.0 eq of acid.
Reaction performed with 1.0 eq of TDG.