1: 97 percent / 5percent KOH / methanol; H2O 2: NEt3 / tetrahydrofuran / 0.75 h / -10 °C 3: 59 percent / tetrahydrofuran / Ambient temperature 4: 49 percent / NaBH4, acetic acid / tetrahydrofuran / 3.5 h / Heating 5: 61 percent / PPh3, n-Bu3N / Pd(OAc)2 / hexamethylphosphoric acid triamide / 5 h / 100 °C 6: 90 percent / H2 / PtO2 / ethanol View Scheme