1: 89 percent / MCPBA / CH2Cl2 / 0.17 h / -10 - -5 °C 2: 68 percent / (Cl3CCO)2O / CH2Cl2 / 1.) 0 deg C, 1 h, 2.) room temperature, 2 h View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 85 percent / Na₂CO₃ / H₂O; methanol / 4 h / Heating<br />2: 1.) Ph₂POCl, N-methylmorpholine / 1.) THF, -10 deg C, 30 min, 2.) room temperature<br /> <br /> &nbsp;