Catalytic asymmetric construction of spiro pyrrolidines with contiguous quaternary centers via 1,3-dipolar cycloaddition of azomethine ylides
作者:Tanglin Liu、Qinghua Li、Zhaolin He、Jiawei Zhang、Chunjiang Wang
DOI:10.1016/s1872-2067(14)60204-7
日期:2015.1
high functionality and up to three contiguous all-carbon quaternary stereogenic centers were synthesized by Cu(I)-catalyzed asymmetric endo-selective 1,3-dipolar cycloaddition of azomethine ylides with cyclopropylidene acetates. This synthesis system performs well for a broad scope of substrates. α-unsubstituted/α-substituted azomethine ylides and cyclopropylidene acetates are compatible 1,3-dipoles
通过Cu(I)催化的偶氮甲碱叶立德与环丙叉的不对称内选择性1,3-偶极环加成反应合成了具有高官能度和多达三个连续全碳四元立体中心的生物活性5-氮杂-螺[2,4]庚烷醋酸盐。该合成系统适用于广泛的底物。α-未取代/α-取代的偶氮甲碱叶立德和环丙叉乙酸酯是相容的 1,3-偶极子和亲偶极体,它们在吡咯烷环的 2-、3-和 4-位提供具有连续四级中心的螺杂环,产率很高(高达到 97%) 和高非对映选择性 (95:5–>98:2 dr) 和出色的对映选择性 (87%–98% ee)。