Bimetallic catalysis in the highly enantioselective ring–opening reactions of aziridines
作者:Bin Wu、Judith C. Gallucci、Jon R. Parquette、T. V. RajanBabu
DOI:10.1039/c3sc52929k
日期:——
lanthanide-salen complexes, readily prepared from commercially available metal isopropoxides, 2-dimethylaminoethanol, 1,1′-binaphthyl-2,2′-diamine and 2-hydroxy-3-methoxybenzaldehyde (3 steps) catalyze highly enantioselective ring opening (∼90–99% ee) reactions of meso-N-4-nitrobenzoyl aziridines by TMSCN and TMSN3. The TMSN3-mediated reactions give the highest enantioselectivities reported to date
Enantioselective Desymmetrization of<i>meso</i>-Aziridines with TMSN<sub>3</sub>or TMSCN Catalyzed by Discrete Yttrium Complexes
作者:Bin Wu、Judith C. Gallucci、Jon R. Parquette、T. V. RajanBabu
DOI:10.1002/anie.200804415
日期:2009.1.26
Y is it so? Dimeric yttrium–salen complexes (see structure; N blue, O red, Y magenta) catalyze the highly enantioselective ring‐opening of meso‐aziridines by TMSCN and TMSN3. To explain the dramatic differences in the selectivity between mono‐ and dimeric catalysts, a dimetallic mechanism based on the solid‐state structure of the dimer is proposed.