1: 47 percent / diethyl phosphorocyanidate, triethylamine / various solvent(s) / 40 h / 0 °C 2: 94.5 percent / H2 / platinum oxide / various solvent(s) / 3 h / Ambient temperature 3: 89.9 percent / triethylamine / methanol / 3 h / Ambient temperature View Scheme