1: CH2Cl2 / 0.5 h / 20 °C 2: 24 percent / 1.1N methanolic HCl / CH2Cl2 / 48 h / -20 °C View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1: 73 percent / triethylamine / ethanol / Ambient temperature<br />2: 91 percent / conc. HCl / methanol; H₂O / Heating<br />3: 1.) Na₂CO₃ / 1.) H₂O<br /> <br /> &nbsp;