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A variety of N-substituted isothiocyanates were employed for the synthesis of imidazolidine-2-thiones, involving the ring expansion of N-alkylaziridine-2-carboxylates. The latter undergo ring opening and cyclization via completely regio- and stereoselective processes to afford the target trans-imidazolidine-2-thiones, depending on the steric and electronic effects of the N-substituents on the aziridines...
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