(i) CH2N2, Et2O, (ii) AlCl3, PhCl; Multistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: 92 percent / dimethylsulfoxide / Ambient temperature<br />2: 82 percent / KOH / ethanol / 24 h / Heating<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 90 percent / dimethylsulfoxide / Ambient temperature<br />2: 82 percent / KOH / ethanol / 24 h / Heating<br /> <br /> &nbsp;