1: CH2Cl2 / 6 h / 20 °C 2: 82 percent / CH2Cl2 / 0.5 h / 0 °C 3: sodium hydroxide; aq. H2O2 / tetrahydrofuran / 3 h / 20 °C View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1.1: n-butyllithium / -78 &deg;C<br />2.1: dicyclohexylborane / tetrahydrofuran / 0 - 20 &deg;C<br />2.2: 78 percent / AcOH / tetrahydrofuran / 6 h / 20 &deg;C<br /> <br /> &nbsp;