Substrate scope screening of sodium sulfonate^a.

^aGeneral conditions: 1 (2.0 mmol), 2 (2.2 mmol), TBAB (32.2 mg, 5 mol%), CH₃CN (10 mL, 0.2 M); KHF₂ (468 mg, 3.0 eq.), acetone (10 mL, 0.2 M), isolated yields.

^bAdditional 3 h at 70 °C was required after reacting at 60 °C for 12 h.

^cTBAB (128.8 mg, 20 mol%).

^dND = not detected.