aluminium trichloride in dichloromethane T=20°C; intramolecular Friedel-Crafts heteroannulation; 24 h;

<b>Multi-step reaction with 2 steps<br /> </b>1: K₂CO₃ / acetone / 12 h / 60 &deg;C<br />2: 72 percent / 5 h / 90 &deg;C<br /> <br /> &nbsp;