Highly Active Oligomeric (salen)Co Catalysts for Asymmetric Epoxide Ring-Opening Reactions
作者:Joseph M. Ready、Eric N. Jacobsen
DOI:10.1021/ja005867b
日期:2001.3.1
nucleophile. In this mechanistic context, complexes that contain multiple metal centers in appropriate relative proximity and orientation can provide improved reactivity relative to monometallic catalysts. For example, chiral metal salencomplexes such as 1 are effective catalysts for asymmetric epoxide ringopening reactions, and operate by a second-order mechanism.2 Linking these catalysts as dimers3 or to
A broadly applicable and practical oligomeric (salen)Co catalyst for enantioselective epoxide ring-opening reactions
作者:David E. White、Pamela M. Tadross、Zhe Lu、Eric N. Jacobsen
DOI:10.1016/j.tet.2014.03.043
日期:2014.7
enhancements in reactivity and enantioselectivity relative to monomeric and other multimeric (salen) Co catalysts in a wide variety of enantioselective epoxide ring-opening reactions. The application of catalyst 4a is illustrated in the kinetic resolution of terminalepoxides by nucleophilic ring-opening with water, phenols, and primary alcohols; the desymmetrization of meso epoxides by addition of