In an oven-dried Schlenk tube, an oxime ether (0.20 mmol), an alkyne (0.30 mmol, or 0.40 mmol for dialkyl acetylene), catechol (44 mg, 0.40 mmol), TP1 (15 mg, 0.022 mmol), Fe(acac)3 (7.0 mg, 10 0.020 mmol), and xylene (0.40 mL) were combined. Subsequently, a solution of Al(i-Bu)3 in toluene (1.0 mol/L, 0.40 mL, 0.40 mmol) was added by rinsing the inner walls of the Schlenk tube at room temperature. The reaction mixture was stirred at room temperature for 5 minutes to allow generation of i-BuAl•catecholate in-situ and then at 140 ℃ for 24 hours. After completion, the reaction mixture was cooled to room temperature, diluted with dichloromethane (2 mL) or toluene 15 (2 mL), and carefully quenched with methanol (0.1 mL). Then, solvents were removed under reduced pressure. The crude product was directly purified through silica gel chromatography or reprecipitation.