1.1: 4-(dimethylamino)pyridine; acetic anhydride / diethyl ether / 1.5 h / 21 °C 1.2: 79 percent / sodium borohydride / diethyl ether; ethanol / 0 - 21 °C 2.1: 39 mg / bis(triphenylphosphine)palladium(II) dichloride; cesium carbonate / toluene / 3 h / Heating 3.1: KOH / methanol; 1,2-dimethoxy-ethane / 0.17 h / 0 °C 3.2: 15 mg / H2SO4 / methanol; 1,2-dimethoxy-ethane / 0.17 h / -18 °C View Scheme