Organocatalyzed Michael addition of N-substituted tetramic acids to nitroalkene acceptors followed by O-alkylation gave polyfunctionalized tetramic acid (31 examples, 59–94% ee). The enantioselectivity of the product was influenced by the N-substituent of the substrate. Quantum chemical methods provided the mechanistic insights of the studied transformation. The preferred reaction pathway follows the
将 N-取代的四聚酸迈克尔加成到硝基烯烃受体,然后进行O-烷基化,得到多官能化的四聚酸(31 个实例,59–94% ee)。产物的对映选择性受底物的N-取代基影响。量子化学方法提供了所研究转化的机理见解。首选反应途径遵循 Pápai 等人提出的模型。单晶结构证实了绝对构型,与ECD测算结构相符。此外,对选定的四聚酸和四聚酸与反式烷基化的比较研究公开了-β-硝基苯乙烯。后续酰胺化证明了此类化合物可用于掺入二肽和缩酚酸肽序列。