1.1: BH3*THF / tetrahydrofuran / 1.5 h / Heating 1.2: 82 percent / I2 / tetrahydrofuran; methanol / 20 °C 2.1: 64 percent / Et3N / CH2Cl2 / 0 °C 3.1: 68 percent / m-chloroperbenzoic acid / CH2Cl2 / 0 °C 4.1: 60 percent / NaHCO3 / xylene / 25 h / Heating 5.1: Bu3SnH; 1,1'-azobis(cyclohexanecarbonitrile) / toluene / 1 h / Heating View Scheme

1.1: BH3*THF / tetrahydrofuran / 1.5 h / Heating 1.2: 82 percent / I2 / tetrahydrofuran; methanol / 20 °C 2.1: 91 percent / 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride; N-methylmorpholine / CH2Cl2 / 2 h / 0 °C 3.1: m-chloroperbenzoic acid / CH2Cl2 / 0 °C 4.1: 81 percent / NaHCO3 / xylene / 14 h / Heating 5.1: Bu3SnH; 1,1'-azobis(cyclohexanecarbonitrile) / toluene / 1 h / Heating View Scheme