The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 344-25-2, Name is H-D-Pro-OH, SMILES is O=C(O)[C@@H]1NCCC1, in an article , author is Endo, Kenichi, once mentioned of 344-25-2, Product Details of 344-25-2.
Asymmetric construction of tetrahedral chiral zinc with high configurational stability and catalytic activity
Chiral metal complexes show promise as asymmetric catalysts and optical materials. Chiral-at-metal complexes composed of achiral ligands have expanded the versatility and applicability of chiral metal complexes, especially for octahedral and half-sandwich complexes. However, Werner-type tetrahedral complexes with a stereogenic metal centre are rarely used as chiral-at-metal complexes because they are too labile to ensure the absolute configuration of the metal centre. Here we report the asymmetric construction of a tetrahedral chiral-at-zinc complex with high configurational stability, using an unsymmetric tridentate ligand. Coordination/substitution of a chiral auxiliary ligand on zinc followed by crystallisation yields an enantiopure chiral-only-at-zinc complex (> 99% ee). The enantiomer excess remains very high at 99% ee even after heating at 70 degrees C in benzene for one week. With this configurationally stable zinc complex of the tridentate ligand, the remaining one labile site on the zinc can be used for a highly selective asymmetric oxa-Diels-Alder reaction (98% yield, 87% ee) without substantial racemisation. Unlike traditional chiral metal complexes, which typically contain chiral ligands, in chiral-at-metal complexes chirality originates from a stereogenic metal center bound to achiral ligands. Herein, the authors use an unsymmetric tridentate ligand to construct a Werner-type tetrahedral chiral-at-zinc complex which displays high configurational stability and catalyzes an oxa-Diels-Alder reaction with high yield and enantioselectivity.
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Reference:
Metal catalyst and ligand design,
,Ligand Template Strategies for Catalyst Encapsulation – NCBI