We synthesized several sulfur isosters of ferulenol and related prenylcoumarins from Ferula communis preliminary to finding whether the antitubercular activity of these natural compounds might be dissociated from their antithrombin activity. Direct thionation of ferprenine, an instance of “diversity-oriented” synthesis, yielded a mixture of three thiocoumarin derivatives. When 4-hydroxy-2-deoxy-2-thiocoumarin