1: 41 percent / triethylamine, phosphoryl chloride / benzene / 4 h 2: triethylamine / benzene / 15 h 3: 47 percent / H2 / 10percent Pd/C / ethanol / 96 h / Ambient temperature 4: 50 percent / tetrahydrofuran / 12 h / Ambient temperature 5: 28 percent / B2F6 / tetrahydrofuran / 12 h / Ambient temperature View Scheme