trifluoroacetic acid 3 h; Ambient temperature;

<b>Multi-step reaction with 2 steps<br /> </b>1: 81 percent / Sn, HCl aq. / 4 h / 50 &deg;C<br />2: Et₃N / CH₂Cl₂ / 0.25 h<br /> <br /> &nbsp;