1: 1,3-dimercaptopropane With trimethylaluminum in dichloromethane; toluene T=20°C; 0.5 h; 2: 3-methyltetrahydro-2H-pyran-2-one in dichloromethane; toluene 20 h; Heating; Further stages.;

1: LDA 2: H2O2 3: NBS 4: Et3N View Scheme

aluminium trichloride in 1,2-dichloro-ethane T=15 - 25°C; 5 h;

1: 88 percent / AlCl3 / 1,2-dichloro-ethane / 5 h / 15 - 25 °C 2: 73 percent / NaIO4; RuCl3*H2O / acetonitrile; ethyl acetate; H2O / 4 h / 20 °C View Scheme

1: 88 percent / AlCl3 / 1,2-dichloro-ethane / 5 h / 15 - 25 °C 2: 73 percent / NaIO4; RuCl3*H2O / acetonitrile; ethyl acetate; H2O / 4 h / 20 °C 3: 100 percent / tetrahydrofuran; diethyl ether / 0 - 20 °C View Scheme

1: 88 percent / AlCl3 / 1,2-dichloro-ethane / 5 h / 15 - 25 °C 2: 73 percent / NaIO4; RuCl3*H2O / acetonitrile; ethyl acetate; H2O / 4 h / 20 °C 3: 100 percent / tetrahydrofuran; diethyl ether / 0 - 20 °C 4: 93 percent / Lawesson reagent / toluene / 0.5 h / 130 °C View Scheme

C13H31BS in tetrahydrofuran T=20°C; 18 h;