1.1: lithium hydroxide hydrate / tetrahydrofuran; water / 5 h / 0 - 25 °C 1.2: pH 3 2.1: N-ethyl-N,N-diisopropylamine; 1-hydroxy-7-aza-benzotriazole; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate / dichloromethane / 15 h / 0 - 25 °C / |Inert atmosphere 3.1: dichloromethane / 3 h / 0 - 25 °C / |Inert atmosphere 4.1: triethylamine / dichloromethane / 15 h / 0 - 25 °C / |Inert atmosphere 5.1: lithium hexamethyldisilazane; sulfur / tetrahydrofuran / 2.08 h / 25 °C / |Inert atmosphere View Scheme

1: dichloromethane / 3 h / 0 - 25 °C / |Inert atmosphere 2: triethylamine / dichloromethane / 15 h / 0 - 25 °C / |Inert atmosphere 3: lithium hexamethyldisilazane; sulfur / tetrahydrofuran / 2.08 h / 25 °C / |Inert atmosphere View Scheme

perchloric acid; dimethylsulfide; 3-chloro-benzenecarboperoxoic acid 1.) CH2Cl2, 0 deg C, 10 min 2.) 9 h, r.t.; Yield given. Multistep reaction;

aluminum oxide in benzene 12 h; Ambient temperature;

pyridine; sodium tetrahydroborate 1.) 0 deg C, 2.) methanol, room temperature, 4 h; Yield given. Multistep reaction;