ammonium formate; palladium 10 on activated carbon in methanol 10 h; Reflux;

1: methanol / 16 h 2: Lawesson's reagent / tetrahydrofuran / 3 h 3: 2 h / 30 °C 4: triethylamine; nitromethane / N,N-dimethyl-formamide / 12 h / 20 °C / Inert atmosphere 5: ammonium formate / palladium 10 on activated carbon / methanol / 10 h / Reflux View Scheme

1: Lawesson's reagent / tetrahydrofuran / 3 h 2: 2 h / 30 °C 3: triethylamine; nitromethane / N,N-dimethyl-formamide / 12 h / 20 °C / Inert atmosphere 4: ammonium formate / palladium 10 on activated carbon / methanol / 10 h / Reflux View Scheme

1: 2 h / 30 °C 2: triethylamine; nitromethane / N,N-dimethyl-formamide / 12 h / 20 °C / Inert atmosphere 3: ammonium formate / palladium 10 on activated carbon / methanol / 10 h / Reflux View Scheme