Simple aromatic substituents in the substrate molecule, including pyrimidine, pyridine, and benzene rings, directly facilitated the intramolecular cycloaddition of azomethine ylide to alkene. All of these aromatic substituents aided the formation of azomethine ylides, which then underwent highly diastereospecific sequential cycloaddition. It was shown that both the presence of an electron-deficient
底物分子中的简单芳香族取代基(包括
嘧啶,
吡啶和苯环)直接促进了亚甲
亚胺叶立德分子内环加成烯烃。所有这些芳族取代基均有助于形成甲
亚胺基团,然后对其进行高度非对映特异性的连续环加成。结果表明,缺电子的芳环和在芳环相对于
氨基甲基的邻位的取代基的存在都增强了偶氮甲
亚胺对环加成的反应性。