1: 1.) NaBH4, HCl; 2.) 85 percent HCO2H-85 percent H3PO4 (1:1) / 1.) EtOH; 2.) 24 h, r.t. 2: TFA / CH2Cl2 / Ambient temperature 3: 45 percent / TiCl4, allyltrimethylsilane / CH2Cl2 / 4 h / Ambient temperature 4: 52 percent / LiAlH4 / diethyl ether / Heating 5: H2 / 10 percent Pd-C / ethanol View Scheme