1: pyridine 2: aq. NaOH 3: pyridine View Scheme

<b>Multi-step reaction with 6 steps<br /> </b>1: 1) 1 N NaOH; 2) pyridine / 1) dioxane, 40 degC, 5 min.<br />2: 67 percent / water / pyridine / 0.25 h / 50 &deg;C<br />3: pyridine<br />4: H₂O / pyridine / 0.08 h / 45 - 50 &deg;C<br />5: pyridine / 0.01 h<br />6: 3 percent / silica gel / CHCl₃ / 120 h<br /> <br /> &nbsp;