1: 92 percent / p-toluenesulfonic acid, water / tetrahydrofuran / 16 h / Ambient temperature 2: 90 percent / NaBH4 / ethanol / 1 h / 0 °C 3: 67 percent / pyridine / 3 h / Ambient temperature 4: 80 percent / Mg / Li2CuCl4 / tetrahydrofuran 6: KOH / methanol; hexane; H2O / 2 h / Ambient temperature View Scheme