1: MCPBA / CH2Cl2 / 0.17 h / -78 °C / sodium metaperiodate 2: CaCO3 / pyrolysis View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: LDA / tetrahydrofuran / -78 &deg;C<br />2: 2) 2M HCl / 1) THF, HMPA, -78 to 20 deg C<br /> <br /> &nbsp;