1: aq. sodium hydrogen carbonate, aluminium amalgam / tetrahydrofuran; methanol / 1.) 10 deg C, 2 h, 2.) room temperature, 4 h 2: 80 percent / K-Selectride / tetrahydrofuran / 5 h / -50 - -45 °C 3: hydrofluoric acid / acetonitrile / 1 h / -5 °C 4: base hydrolysis View Scheme

1: aq. sodium hydrogen carbonate, aluminium amalgam / tetrahydrofuran; methanol / 1.) 10 deg C, 2 h, 2.) room temperature, 4 h 2: 80 percent / K-Selectride / tetrahydrofuran / 5 h / -50 - -45 °C 3: hydrofluoric acid / acetonitrile / 1 h / -5 °C View Scheme