Abstract
The 1,3-dipolar cycloaddition of cyclic nitrones to several C 6 α,β-unsaturated esters and lactones with different functionalities has been studied. All these olefins have shown high stereoselectivity, with a predominance of the exo or endo transition state for the cis or trans dipolarophiles, respectively. The antifacial approach is favoured in the reactions with γ-substituted hexenolides and also with the substituted nitrone 21.
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