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Alkyl, aryl and acyl-substituted pyrrolidinones as an alternative to isoxazolines can be formed by [3+2] cycloaddition reactions between alkyl oxaziridines and aliphatic alkynes. The structures of isolated products change with oxaziridines Ar groups and with alkynes R and R' groups.

Alkenes. -The title products are exclusively or predominantly formed as cis-isomers. The steric hindrance of the tert-butyl group on the nitrogen in (I) is responsible for the high diastereoselectivity. -(FABIO, M.; RONZINI, L.; TROISI*, L.; Tetrahedron 63 (2007) 52, 12896-12902; Dip. Sci. Tecnol. Biol. Ambientali, Univ. Lecce, I-73100 Lecce, Italy; Eng.) -Klein 21-134