1: methylaluminum bis(2,6-diphenylphenoxide) (reagent B) / toluene / 0.5 h / -20 °C 2: NaBH4 / methanol / 0.08 h / Ambient temperature 3: pyridine, DMAP / CH2Cl2 / 0.5 h / Ambient temperature View Scheme

1: 79 percent / methylaluminum bis(2,6-diphenylphenoxide) / toluene / 0.25 h / -78 °C 2: NaBH4 / methanol View Scheme