1: LiAlH4 / tetrahydrofuran / 4 h / 0 °C 2: 145 mg / HCl / tetrahydrofuran; H2O / 40 h / 23 °C / pH 2 - 3 3: triphenylphosphine; diisopropyl azodicarboxylate / benzene / 1.5 h / 23 °C 4: 326 mg / LiOH; Et3N / methanol; H2O / 2 h / 23 °C 5: 66 percent / Et3N / acetonitrile / 7 h / 23 °C View Scheme

1: LiAlH4 / tetrahydrofuran / 4 h / 0 °C 2: 145 mg / HCl / tetrahydrofuran; H2O / 40 h / 23 °C / pH 2 - 3 3: triphenylphosphine; diisopropyl azodicarboxylate / benzene / 1.5 h / 23 °C 4: 326 mg / LiOH; Et3N / methanol; H2O / 2 h / 23 °C View Scheme