1: NaBH4 / methanol / 2 h / Ambient temperature 2: pyridine, DMAP / CH2Cl2 / 6 h / Ambient temperature 3: 68 percent / n-Bu3SnH, AIBN / toluene / 3 h / Heating 4: 100 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 6 h / Ambient temperature 5: 100 percent / Et3N, DMAP / CH2Cl2 / 2 h / 0 °C 6: 89 percent / DBU / toluene / 18 h / 100 °C View Scheme