1: DBN / benzene / 6 h / Heating 2: 82 percent / NaOH / acetone; H2O / 4 h / Ambient temperature 3: 79 percent / acetic acid / dimethylformamide / 60 °C 4: 83 percent / cerric(IV) ammonium nitrate / acetonitrile; H2O View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: sodium sulfate / CH₂Cl₂ / 2 h / 0 &deg;C<br />2: NEt₃ / CH₂Cl₂ / Heating<br /> <br /> &nbsp;