1.1: diethyl ether / 2 h / -78 °C 2.1: 34 mg / Dess-Martin periodinane / CH2Cl2 / 3 h / 0 °C 3.1: dibutylboron triflate; diisopropylethylamine / CH2Cl2 / 0.5 h / -78 °C 3.2: CH2Cl2 / 3 h / -78 - 20 °C 4.1: 12 mg / pyridine; chromium trioxide / CH2Cl2 / 0.33 h / 20 °C 5.1: 85 percent / HF / H2O; acetonitrile / 3 h / 20 °C 6.1: LiOH / H2O; 1,2-dimethoxy-ethane / 7 h / 80 °C View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 75 percent / Bu₃SnH / AIBN / toluene / 1.17 h / Heating<br />2: 86 percent / N-methylmorpholine N-oxide; 4 Angstroem molecular sieves / tetrapropylammonium perruthenate / CH₂Cl₂ / 0.5 h / 20 &deg;C<br /> <br /> &nbsp;