boron trichloride in dichloromethane T=-80°C; 16 h;

<b>Multi-step reaction with 2 steps<br /> </b>1: 45 percent / Et₃N / CH₂Cl₂ / 16 h / Ambient temperature<br />2: 92 percent / NH₃/MeOH / CH₂Cl₂ / 15 h / Ambient temperature<br /> <br /> &nbsp;