Electrooxidative tandem cyclization of enaminones to give 3-arylthiochromone derivatives

A novel and electrooxidative tandem cyclization of enaminones with aryl/alkylthiol and ArSSAr to 3-arylthiochromone derivatives were reported. Compared to previous methods, the reaction doesn't need metal catalyst, oxidant and high reaction temperatures and it has a wider range scope of substrate tolerance. The reaction is environmentally friendly, providing a new and efficient route to make 3-substituted chromones at room temperature.