Abstract
Abstract 1,3-Dipolar cycloadditions of the nitrone 1 to α,β-unsaturated δ-lactones: non-chiral 13 , racemic mixture 3 / 4 , d - glycero 3 , and l - glycero 4 proceed with high stereoselectivity in the cases of 13 and 3 and a significant kinetic resolution in the case of the racemate 3 / 4 . The exo approach to the re – re sides of the lactones predominates.
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