1: 55 percent / PTS / methanol / 10 h / Ambient temperature 2: 68.5 percent / pyridinium chlorochromate, sodium acetate / CH2Cl2 / 2 h 3: 1) sodium hydride / 1) diglyme, 2) THF, a) room temperature, 8 h, b) 50 deg C, 1.5 h, c) overnight 4: 78 percent / 10percent aq. methanolic KOH / methanol / 2 h / Heating 5: 72.5 percent / triethylamine, POCl5 / CH2Cl2 / 1) 0 deg C, 1 h, 2) room temperature, 30 min View Scheme

potassium fluoride; potassium hydroxide; 2-(dimethylamino)-ethanol; Sn[N(SiMe3)2]2 1.) hexane, THF, 2.) THF, room temperature, 14 h; Yield given. Multistep reaction;