sodium hydroxide; hypophosphorous acid; sodium nitrite 1.) water, dioxan, 2.) 0 deg C, 20 min; 70 deg C, 2 h; room temperature, 10 h; Multistep reaction;

Multi-step reaction with 3 steps 1: conc. HCl / methanol; H2O / 0.25 h / Ambient temperature2: PCC, CH3COONa / CH2Cl2 / 2 h / Ambient temperature3: 8percent NaOH / H2O / 60 °C