1: 78 percent / Amberlyst-15 / methanol / 15 h / Ambient temperature 2: 66 percent / tetrahydrofuran / 0.5 h / -10 °C 4: NBS, NaHCO3 / hexane / 1 h / Heating 5: γ-collidine / xylene / 1.5 h / Heating 6: CH2Cl2 / 1 h / Ambient temperature 7: 48 percent / LiAlH4 / tetrahydrofuran / 1 h / Heating 8: ethanol / 0 °C / Irradiation 9: tetrahydrofuran / 1.5 h / Heating View Scheme

Multi-step reaction with 3 steps 2: NaBH4 / ethanol / 2 h / Ambient temperature3: 66 percent / NaH / xylene / 20 h / Heating  

With  amberlyst-15 in  methanol 15 h;  Ambient temperature;   

Multi-step reaction with 2 steps 1: 78 percent / Amberlyst-15 / methanol / 15 h / Ambient temperature2: 66 percent / tetrahydrofuran / 0.5 h / -10 °C  

Multi-step reaction with 6 steps 1: 78 percent / Amberlyst-15 / methanol / 15 h / Ambient temperature2: 66 percent / tetrahydrofuran / 0.5 h / -10 °C4: NBS, NaHCO3 / hexane / 1 h / Heating5: γ-collidine / xylene / 1.5 h / Heating6: CH2Cl2 / 1 h / Ambient temperature