1: NaOCl, Et3N / CH2Cl2 / 0 °C 2: hydrogen, H2O / Raney-Ni / methanol / Ambient temperature 3: Et3N / CH2Cl2 / -70 °C 4: Zn, AcOH / CH2Cl2 / Ambient temperature View Scheme

aluminum oxide; Lanthanum chloride; sodium dihydrogenphosphate 0.05 h; microwave irradiation;