triethyl borane; tri-n-butyl-tin hydride in toluene T=0°C; 0.0833333 h; Yield given;

<b>Multi-step reaction with 3 steps<br /> </b>1: Ti(OiPr)4, tBuOOH, (-)-diethyl tartrate / CH₂Cl₂ / -20 &deg;C<br />2: NaH / tetrahydrofuran / -78 - 0 &deg;C<br />3: K₂CO₃ / methanol / Ambient temperature<br /> <br /> &nbsp;