Abstract

The addition of alkyl- and arylmagnesium reagents to chiral [1′(R)-α-methylbenzyl]aziridine-2(R)-carboxaldimines was carried out in a highly stereoselective manner to give 2-aminomethylaziridine. Further treatment of 2-aminomethylaziridines with triphosgene and NaH afforded enantiopure 5-alkyl- or 5-aryl-4-chloromethylimidazolidin-2-ones.

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