1: 82 percent / CF3COOH / 1 h / 80 °C 2: 63 percent / methanol / 0.5 h / 50 °C 3: 76 percent / 2N NaOH / 5 h / 100 °C View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1: 100 percent / hydrazine hydrate / acetic acid / 3 h / 100 &deg;C<br />2: 58 percent / dimethylformamide / 2.5 h / 100 &deg;C<br />3: 67 percent / SnCl₂*2H₂O; conc. HCl / dimethylformamide / 0.5 h / 5 - 10 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 58 percent / dimethylformamide / 2.5 h / 100 &deg;C<br />2: 67 percent / SnCl₂*2H₂O; conc. HCl / dimethylformamide / 0.5 h / 5 - 10 &deg;C<br /> <br /> &nbsp;