[Structure: see text] In addition reactions of enecarbamates and enamides, extremely high turnover frequency of the catalyst was observed in comparison with that of silicon enolate addition reactions. This is presumably due to fast transfer of the proton that locates on the nucleophiles.
A C2-symmetric nickel diamine complex as an asymmetric catalyst for enecarbamate additions to butane-2,3-dione
作者:John S. Fossey、Ryosuke Matsubara、Paulo Vital、Shū Kobayashi
DOI:10.1039/b505404d
日期:——
Butane-2,3-dione was activated towards nucleophilicaddition of enecarbamates by a series of metal triflate complexes of a C2-symmetric diamine to give stereogenic, aldol-like, t-alcohols, a novel nickel(II) triflate complex was identified as a good catalyst for this asymmetric transformation, and an aquo nickel(II) complex was identified by XRD techniques.
METHOD OF ENANTIOSELECTIVE NUCLEOPHILIC ADDITION REACTION OF AN ENAMIDE TO A GLYOXYLIC ACID ESTER
申请人:Japan Science and Technology Agency
公开号:EP1707556B1
公开(公告)日:2013-05-08
Highly Diastereo- and Enantioselective Reactions of Enecarbamates with Ethyl Glyoxylate To Give Optically Activesyn andantiα-Alkyl-β-Hydroxy Imines and Ketones