A new and convenient synthesis of some substituted thiohydantoins

3-Substituted thiohydantoins (2a-g) were synthesized in satisfactory yields by the reaction of N-substituted thioureas (1a-g) with chloroacetylchlorid e in the presence of triethylamine under reflux in dioxane. S-Alkylated pro ducts (7, 8) were! obtained from the reaction of 3-p-tolyl -thiohydantoin ( 2d) with p-nitrobenzylchloride and 3-phenyl-5-chloromethyl-1,2,4-oxadiazole .