1: 94 percent / triethylamine, 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 18 h 2: silver oxide / 3 h / Heating 3: 72 percent / 2 M NaOH / pyridine; ethanol / 1.5 h / 0 °C 4: 84 percent / 80 percent acetic acid / 0.92 h / 95 °C View Scheme

benzyl alcohol T=90°C; 30 h;

benzyl alcohol T=90°C; 30 h;