1: 4-(dimethylamino)pyridine / acetonitrile / 1 h / Ambient temperature 2: n-tributyltin hydride, 2,2'-azobis(2-methylpropionitrile) (AIBN) / toluene / 2.5 h / 100 °C 3: AcOH / methanol / 1 h / 100 °C View Scheme

acetic acid in methanol T=100°C; 1 h;