1.1: tetrahydrofuran / 8 h / 20 °C 1.2: p-ABSA; DBU / tetrahydrofuran / 8 h / 20 °C 1.3: 70 percent / aq. LiOH / tetrahydrofuran / 3 h / 20 °C 2.1: 88 percent / Rh2(OAc)4 / CH2Cl2 / 0.25 h / 20 °C 3.1: 74 percent / CF3COOH / 2 h / 40 - 50 °C 4.1: 78 percent / LiAlH4 / tetrahydrofuran / 4 h / Heating View Scheme