期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2011, 期 9, 页码 1714-1720出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201001522
关键词
Biomimetic synthesis; Enzyme models; Ligand design; Michael addition; Diels-Alder reaction; Histidine; Copper
资金
- Integrated Design for Catalytic Nanomaterials for a Sustainable Production (IDECAT)
- European Research Area (ERA) Chemistry program
- National Research School Combination Catalysis Controlled by Chemical Design (NRSC-Catalysis)
A triazacyclophane (TAC) scaffold decorated with three histidine amino acid residues was used as a tridentate ligand in asymmetric copper(II)-catalysed Diels-Alder and Michael addition reactions in water. Enantiomeric excesses up to 55% were obtained in Diels-Alder reactions using ligands in which the histidine residues were directly attached to the TAC scaffold. Additional amino acid residues on the N-termini of the histidine residues or positioned between the histidine residues and the TAC scaffold, resulted in almost complete loss of enantioselectivity. Modelling studies of the coordination complex of the most specific ligand indicated the presence of a substrate binding pocket in proximity to the catalytically active centre.
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