Substrate scope using TT salt 1a and different phosphites^a.

^aReaction conditions: 0.5 mmol of TT salt 1a, 2.5 mmol of the corresponding phosphite, 0.5 mmol of KHCO₃ in MeCN (0.1 M) under 390 nm Kessil® irradiation for 30 minutes.

^bOvernight irradiation.