69614-04-6Relevant articles and documents
(S)-Histidine: The ideal precursor for a novel family of chiral aminoacid and peptidic ionic liquids
Guillen, Frédéric,Brégeon, Delphine,Plaquevent, Jean-Christophe
, p. 1245 - 1248 (2006)
(S)-Histidine is shown to be a powerful chiral precursor for the construction of a new series of imidazolium-containing chiral ionic liquids, in which the chiral bifunctional unit of the aminoacid remains unchanged. These ionic materials can be used as building blocks for the synthesis of peptidic ionic liquids.
A Stereoselective Tyrosinase Model Compound Derived from an m-Xylyl- l -histidine Ligand
Presti, Eliana Lo,Perrone, Maria L.,Santagostini, Laura,Casella, Luigi,Monzani, Enrico
, p. 7335 - 7344 (2019/06/04)
The aim of mimicking enzyme activity represents an important motivation for the development of new catalysts. A challenging objective is the development of chiral complexes for bioinspired enantioselective oxidation reactions. Herein, we report a new chiral dinuclear copper(II) complex based on a m-xylyl-bis(histidine) ligand (mXHI) as a biomimetic catalyst for tyrosinase and catechol oxidase. The new ligand improves a previous system also containing two tridentate N3 units derived from l-histidine that were connected by a short, rigid ethanediamine bridge. In mXHI the bridge is provided by the more extended m-xylyl moiety. The dicopper(II) complex [Cu2(mXHI)]4+ was studied as a catalyst for stereoselective oxidations of enantiomeric couples of chiral catechols of biological interest (L/D-dopa, L/D-dopa methyl ester, and (R/S)-norepinephrine), showing excellent discrimination capability, particularly for the methyl esters of dopa enantiomers. The catechol oxidation was studied in acetate buffer as slightly acidic medium, and a role of acetate as bridging ligand between the two coppers, preorganizing the dinuclear center in a more catalytic efficient structure, could be established. The oxidation of β-naphthol and 3,5-ditertbutylphenol was studied as a model monophenolase reaction. The oxidation proceeds stoichiometrically, and the partial incorporation of 18O into β-naphthol when the reaction was performed using 18O2 suggests the existence of two competitive reaction pathways, a genuine monooxygenase mechanism and a radical pathway. However, the more challenging reaction on derivatives of l-/d-tyrosine did not lead to the desired monooxygenase product but only to products of radical oxidation. Complex [Cu2(mXHI)]4+ was also used for the catalytic sulfoxidation of thioanisole in the presence of hydroxylamine as cosubstrate, in a preliminary attempt to model the reaction of external monooxygenases. The reaction proceeds with 25 turnovers, but the enantiomeric excess of sulfoxide was modest.
Preparation method of N(pi)-methyl-L-histidine derivative and application thereof to synthesis of whale carnosine
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Paragraph 0042-0044, (2019/01/08)
The invention relates to a preparation method of an N(pi)-methyl-L-histidine derivative and a method for preparing anserine from the synthesized N(pi)-methyl-L-histidine derivative. By the preparationmethod, raw materials are cheap and easy to obtain, the selectivity is good and the yield is high; the operation is simple and easy to implement, a technology is stable, the control is easy, treatment after a reaction is convenient, the product yield is good, the purity is high, and the preparation method can be economically and conveniently applied to industrial production.