Cycloadditions of highly functionalized C6-synthons to cyclic nitrones
作者:Montserrat Closa、Pedro de March、Marta Figueredo、Josep Font、Angeles Soria
DOI:10.1016/s0040-4020(97)10083-7
日期:1997.12
The 1,3-dipolar cycloaddition of cyclic nitrones to several C6 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