An oven-dried Schlenk tube, equipped with a magnetic stir bar, was charged with BCB 1 (0.2 mmol, 1.0 equiv), N-amidocollidinium tetrafluoroborate 2 (0.4 mmol, 2.0 equiv), NaHCO3 (0.2 mmol, 1.0 equiv), and fac-Ir(ppy)3 (0.004 mmol, 2 mol%) under air. The tube was evacuated and back-filled with argon three times, and then dry dichloromethane (0.1 M) was added under argon counter-flow. The tube was then sealed with a screw-cap, and the resulting reaction mixture was vigorously stirred under the irradiation at 450 nm for 16 h. After this time, the solvent was removed under reduced pressure and the product was purified by silica gel column chromatography, using pentane/EtOAc as eluent, to afford the desired 2-oxa-4-azabicyclo[3.1.1]hept-3-ene product 3.