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The synthesis of trans 5-aroyl-3,4-diarylthiazolidine-2-iminium chlorides 2 or trans 2-aroyl-1-aryl-1,2-dihydro-thiazolo[3,2-a]quinazoline-5-ones 3 by treatment of threo 1,3-diary-3-arylamino-2-thiocyanatopropanones 1 with dry hydrogen chloride is described. The reaction of the salts 2 with several acid chlorides yields the corresponding 2-(aroylimino), 2-(arylsulfenylimino) and 2-(arylsulfonylimino) substituted thiazolidines 6, 7 and 8, respectively.
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