Table 1 Condition optimization^a

^aReaction conditions: 1a (0.1 mmol), 2a (1.5 equiv.), [Pd] (10 mol%), Ligand (20 mol%), preNHC (20 mol%), Cs₂CO₃ (2.0 equiv.), 1.0 mL PhCF₃, 36 W Blue LEDs, r.t., under N₂.
^bYields of 3a determined by ¹H NMR using CH₂Br₂ as standard.
^cYields of 4a determined by ¹H NMR using CH₂Br₂ as standard.
^dIsolated yields.
^e10 mol% of preNHC was used.
^f5 mol% of Pd(OAc)₂ was used.
^g10 mol% of L3 was used.
^h36w White LEDs.
ⁱIn dark. r.t. = room temperature.

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