Scheme 3.
The control experiments. aTEA (1.8 mmol), silica gel (5.0 g), bPd(OAc)2 (5 mol %), PPh3 (10 mol %), TEA (1.8 mmol), silica gel (5.0 g), cPd(OAc)2 (5 mol %), PPh3 (10 mol %), TEA (1.8 mmol), NaBr (10.0 g).
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