Catalysis of a 1,3-dipolar reaction by distorted DNA incorporating a heterobimetallic platinum(<scp>ii</scp>) and copper(<scp>ii</scp>) complex
作者:Iván Rivilla、Abel de Cózar、Thomas Schäfer、Frank J. Hernandez、Alexander M. Bittner、Aitziber Eleta-Lopez、Ali Aboudzadeh、José I. Santos、José I. Miranda、Fernando P. Cossío
DOI:10.1039/c7sc02311a
日期:——
A novel catalytic system based on covalently modified DNA is described. This catalyst promotes 1,3-dipolar reactions between azomethine ylides and maleimides. The catalytic system is based on the distortion of the double helix of DNA by means of the formation of Pt(II) adducts with guanine units. This distortion, similar to that generated in the interaction of DNA with platinum chemotherapeutic drugs
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.