Fig. 4: Substrate scope with diphenylphosphine oxide indoles.

Reaction conditions unless otherwise noted: c (0.10 mmol), Ph₂ISbF₆ (0.2 mmol), CuI (0.01 mmol), L6 (0.015 mmol), NaOTf (0.001 mmol), DTBP (0.2 mmol), DCM (2 mL) in a sealed tube at 60 °C for 24 h. DTBP 2,6-di-tert-butylpyridine, XRD X-ray crystal diffraction analysis.