Abstract
Copper-catalyzed one-pot synthesis of various 2-arylthiochromenones is developed using xanthate as an odorless sulfur source from easily acquirable 2'-halochalcones. This methodology demonstrates that the cross-coupled product thiochromanone synthesized from 2'-halochalcones (upstream reaction) is oxidized to thiochromenone (downstream reaction) in the same pot using waste byproduct (KI) of the first step as powerful oxidant molecular iodine (I2). This one-pot synthesis has been further extended for the synthesis of 3,3'-methylenebisthioflavone using dimethyl sulfoxide (DMSO) as solvent and methylene source.
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