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
Facile and Effective Copper-Mediated Cyclization Reaction of Cyclopropylideneacetic Acids (or Esters) and Cyclopropylideneacetonitriles
作者:Xian Huang、Hongwei Zhou、Wanli Chen
DOI:10.1021/jo035225h
日期:2004.2.1
The full details of the copper-mediated cyclization reaction of cyclopropylideneacetic acids (or esters) and cyclopropylidenenitriles, the synthetic application of this reaction, and the study of the reaction mechanism are reported.
Novel Tunable CuX<sub>2</sub>-Mediated Cyclization Reaction of Cyclopropylideneacetic Acids and Esters for the Facile Synthesis of 4-Halomethyl-2(5<i>H</i>)-furanones and 4-Halo-5,6-dihydro-2<i>H</i>-pyran-2-ones
作者:Xian Huang、Hongwei Zhou
DOI:10.1021/ol026911q
日期:2002.12.1
[GRAPHICS]A mixture of cyclopropylideneacetic acids (or esters) and CuBr2 (or Cul/l(2)) in aqueous acetonitrile afforded 4-substituted 2(5H)-furanones or 3,4-substituted 5,6-dihydro-2H-pyran-2-ones in moderate to good yields. The selectivity of the reaction greatly depended on the reaction temperature.