Highly efficient catalytic asymmetric [3 + 2] cycloadditions using a chiral copper amide are reported. Compared with the chiral CuOTf/Et3N system, the CuHMDS system showed higher reactivity, and the desired reactions proceeded in high yields and high selectivities with catalyst loadings as low as 0.01 mol %.
Axially Chiral BINIM and Ni(II)-Catalyzed Highly Enantioselective 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides and <i>N</i>-Arylmaleimides
作者:Jing-Wen Shi、Mei-Xin Zhao、Zhi-Yu Lei、Min Shi
DOI:10.1021/jo701561d
日期:2008.1.1
[GRAPHICS]Axially chiral BINIM-Ni(II) complexes are effective catalysts in the asymmetric 1,3-dipolar cycloaddition reactions of azomethine ylides and N-arylmaleimides to give the corresponding adducts in good yields and up to 95% enantiomeric excesses.