1: Na2S*9H2O / ethanol / 12 h / Inert atmosphere; Reflux 2: 2,3-dicyano-5,6-dichloro-p-benzoquinone / chlorobenzene / 9 h / Inert atmosphere; Reflux View Scheme

Multi-step reaction with 2 steps 1: hydrogenchloride; palladium 10 on activated carbon; water; hydrogen / methanol / 24 h / 20 °C / 760.05 Torr2: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere