1: 93 percent / DIBAL-H / CH2Cl2; tetrahydrofuran / 1 h / -78 °C 2: 78 percent / acetic acid; NaCNBH3 / methanol / 30 h / 20 °C 3: 65 percent / conc. HCl / methanol / 2 h / Heating View Scheme

1: 93 percent / DIBAL-H / CH2Cl2; tetrahydrofuran / 1 h / -78 °C 2: 78 percent / acetic acid; NaCNBH3 / methanol / 30 h / 20 °C View Scheme