hydrogenchloride; sodium sulfide; potassium hydroxide in water; N,N-dimethyl-formamide T=80°C; 28 h; Title compound not separated from byproducts;

sodium sulfide; potassium hydroxide; sulfur 1.) 5 min, 2.) DMF, 80 deg C, 24h; Yield given. Multistep reaction;

hydrogenchloride; sodium sulfide; potassium hydroxide in water; N,N-dimethyl-formamide T=80°C; 28 h; Title compound not separated from byproducts;

Multi-step reaction with 7 steps 1: 83 percent / SnCl2 / CH2Cl2 / 25 °C2: 90 percent / H2 / (S)-BINAP-Ru(II) / methanol / 6 h / 100 °C / 20685.9 Torr3: NaBH4; CuSO4 / ethanol / 7 h4: Et3N / CH2Cl2 / 6 h / 0 °C5: pTSA / methanol / 10 h6: PCC / CH2Cl2 / 3 h7: Ag2O; NaOH / ethanol