1: AIBN, Bu3SnH / toluene / 6 h / 75 °C 2: TBAF / tetrahydrofuran / 1 h View Scheme

1: AIBN, Bu3SnH / toluene / 6 h / 75 °C 2: TBAF / tetrahydrofuran / 1 h 3: 80 percent / pyridine / 20 h / Ambient temperature 4: 69 percent / o-chlorophenylphosphorodichloridate / pyridine / 48 h / Ambient temperature 5: 75 percent / NH4OH / dioxane / 2.5 h / Ambient temperature 6: 82 percent / NaOEt / 24 h / Ambient temperature 7: 77 percent / methanol / 4 h / Heating View Scheme

1: AIBN, Bu3SnH / toluene / 6 h / 75 °C 2: TBAF / tetrahydrofuran / 1 h 3: 80 percent / pyridine / 20 h / Ambient temperature 4: 69 percent / o-chlorophenylphosphorodichloridate / pyridine / 48 h / Ambient temperature 5: 75 percent / NH4OH / dioxane / 2.5 h / Ambient temperature 6: 82 percent / NaOEt / 24 h / Ambient temperature View Scheme

1: AIBN, Bu3SnH / toluene / 6 h / 75 °C 2: TBAF / tetrahydrofuran / 1 h 3: 80 percent / pyridine / 20 h / Ambient temperature 4: 69 percent / o-chlorophenylphosphorodichloridate / pyridine / 48 h / Ambient temperature 5: 75 percent / NH4OH / dioxane / 2.5 h / Ambient temperature 6: 82 percent / NaOEt / 24 h / Ambient temperature 7: 77 percent / methanol / 4 h / Heating 8: 78 percent / pyridine / 2 h View Scheme