pyridine; tetraphosphorus decasulfide T=140°C; 36 h;

1.1: 60 percent / aq. KMnO4 / 2-methyl-propan-2-ol / 1.5 h / 75 °C 2.1: 90 percent / 3 h / 155 °C 3.1: TMSN3 / 3 h / 90 - 95 °C 3.2: 55 percent / dimethylformamide / 3 h / 155 °C 4.1: 100 percent / P2S5; pyridine / 36 h / 140 °C View Scheme

1.1: 90 percent / 3 h / 155 °C 2.1: TMSN3 / 3 h / 90 - 95 °C 2.2: 55 percent / dimethylformamide / 3 h / 155 °C 3.1: 100 percent / P2S5; pyridine / 36 h / 140 °C View Scheme

pyridine; tetraphosphorus decasulfide; hydrogen sulfide 1.) reflux, 15 h, 2.) 5 deg C, overnight; Title compound not separated from byproducts;

1.1: methanol; water / 0.33 h / 20 °C 1.2: 20 °C 2.1: N,O-bis-(trimethylsilyl)-acetamide / acetonitrile / 0.33 h / Inert atmosphere; Reflux 2.2: 2.5 h / Inert atmosphere; Reflux 3.1: methanol; ammonia / 36 h / 100 °C / Inert atmosphere View Scheme

potassium hydroxide 1 h;