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
环状硝酮的至几个C的1,3-偶极环加成6 α,β -不饱和酯和具有不同功能的内酯类进行了研究。所有这些烯烃都显示出高的立体选择性,分别具有顺式或反式偶极亲和性的外向或内向过渡态。在与γ-取代的己烯内酯以及与取代的硝酮21的反应中,优选使用抗面方法。