Asymmetric Cobalt-Catalyzed Cyclopropanation With Succinimidyl Diazoacetate
申请人:Zhang X. Peter
公开号:US20120077959A1
公开(公告)日:2012-03-29
Cobalt(II) complexes of the D
2
-symmetric chiral porphyrins are effective catalysts for asymmetric cyclopropanation reactions with succinimidyl diazoacetate. The Co-catalyzed reaction is suitable for various olefins, providing the corresponding cyclopropane succinimidyl esters in high yields and excellent diastereo- and enantio-selectivity. The resulting enantioenriched cyclopropane succinimidyl esters can serve as convenient synthons for the general synthesis of optically active cyclopropyl carboxamides through mild reactions with a wide range of amine derivatives, including unprotected peptides and amino sugars
Asymmetric Co(II)-Catalyzed Cyclopropanation with Succinimidyl Diazoacetate: General Synthesis of Chiral Cyclopropyl Carboxamides
作者:Joshua V. Ruppel、Ted J. Gauthier、Nicole L. Snyder、Jason A. Perman、X. Peter Zhang
DOI:10.1021/ol9005882
日期:2009.6.4
[Co(P1)] is an effective catalyst for asymmetriccyclopropanation with succinimidyl diazoacetate. The Co(II)-catalyzed reaction is suitable for various olefins, providing the desired cyclopropane succinimidyl esters in high yields and excellent diastereo- and enantioselectivity. The resulting enantioenriched cyclopropane succinimidyl esters can serve as convenient synthons for the general synthesis