1: 1.) 2percent methanolic HCl, 2.) potassium carbonate / 1.) 23 deg C, 7 h, 2.) methanol, 23 deg C, 30 min 2: pyridine / 1 h / 23 °C 3: 1.) 70percent perchloric acid, dimethyl carbonate, 2.) lead tetracetate, sodium carbonate / 1.) water, 23 deg C, 4 h, 2.) methylene chloride, -40 deg C, 10 min 4: 32 percent / n-butyllithium, HMPA / tetrahydrofuran / 1.) -78 deg C, 30 min, 2.) -78 deg C -> -20 deg C, 30 min, 3.) -20 deg C -> 0 deg C, 30 min 5: 1.) potassium carbonate, 2.) lithium hydroxide / 1.) methanol, 25 deg C, 6.5 h, 2.) methanol-water (2:1) 23 deg C, 1 h View Scheme