Stereoselective construction of a 5-aza-spiro[2,4]heptane motif via catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides and ethyl cyclopropylidene acetate
作者:Tang-Lin Liu、Zhao-Lin He、Hai-Yan Tao、Yue-Peng Cai、Chun-Jiang Wang
DOI:10.1039/c0cc04329j
日期:——
A direct and facile synthesis of highly functional 5-aza-spiro[2,4]heptanes, a valuable structural motif for drug discovery, is developed via catalytic asymmetric 1,3-dipolarcycloaddition of cyclopropylidene acetate and azomethine ylides for the first time.
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-dipolarcycloaddition of azomethineylides with cyclopropylidene acetates. This synthesis system performs well for a broad scope of substrates. α-unsubstituted/α-substituted azomethineylides and cyclopropylidene acetates are compatible 1,3-dipoles