in methanol; acetone T=50°C; 72 h;

Multi-step reaction with 6 steps 1: 1.) Mg / 1.) ether, 2.) reflux, 1 h2: 1.) NaH / 1.) ether, room temp., 1 h, 2.) room temp., 70 h3: 96 percent / H2S, p-TsOH / various solvent(s) / 1 h / 60 °C4: 96 percent / sulfuryl chloride / diethyl ether / 0.25 h / Ambient temperature5: 97 percent / acetone6: 93 percent / CF3CO3H, Na2HPO4 / CH2Cl2 / 16 h / Ambient temperature