22146-59-4Relevant academic research and scientific papers
Remote Amino Acid Recognition Enables Effective Hydrogen Peroxide Activation at a Manganese Oxidation Catalyst
Costas, Miquel,Olivo, Giorgio,Vicens, Laia
supporting information, (2021/12/27)
Precise delivery of a proton plays a key role in O2 activation at iron oxygenases, enabling the crucial O?O cleavage step that generates the oxidizing high-valent metal–oxo species. Such a proton is delivered by acidic residues that may either
Direct monitoring of biocatalytic deacetylation of amino acid substrates by1H NMR reveals fine details of substrate specificity
De Cesare, Silvia,McKenna, Catherine A.,Mulholland, Nicholas,Murray, Lorna,Bella, Juraj,Campopiano, Dominic J.
supporting information, p. 4904 - 4909 (2021/06/16)
Amino acids are key synthetic building blocks that can be prepared in an enantiopure form by biocatalytic methods. We show that thel-selective ornithine deacetylase ArgE catalyses hydrolysis of a wide-range ofN-acyl-amino acid substrates. This activity was revealed by1H NMR spectroscopy that monitored the appearance of the well resolved signal of the acetate product. Furthermore, the assay was used to probe the subtle structural selectivity of the biocatalyst using a substrate that could adopt different rotameric conformations.
Ligand-Enabled Catalytic C-H Arylation of Aliphatic Amines by a Four-Membered-Ring Cyclopalladation Pathway
He, Chuan,Gaunt, Matthew J.
supporting information, p. 15840 - 15844 (2016/01/29)
A palladium-catalyzed C-H arylation of aliphatic amines with arylboronic esters is described, proceeding through a four-membered-ring cyclopalladation pathway. Crucial to the successful outcome of this reaction is the action of an amino-acid-derived ligand. A range of hindered secondary amines and arylboronic esters are compatible with this process and the products of the arylation can be advanced to complex polycyclic molecules by sequential C-H activation reactions. Four corners: A palladium-catalyzed C-H arylation of aliphatic amines with arylboronic esters is described to proceed by a four-membered-ring cyclopalladation pathway. Crucial to the successful outcome of this reaction is the action of an amino-acid-derived ligand. A range of hindered secondary amines and arylboronic esters are compatible with this process and the products of the arylation can be advanced to complex polycyclic molecules by sequential C-H activation reactions.
Enzyme-assisted Preparation of D-tert.-Leucine
Laumen, Kurt,Ghisalba, Oreste,Auer, Kurt
, p. 1977 - 1980 (2007/10/03)
Optically pure D-tert.-leucine was obtained by the enzymatic hydrolysis of (±)-N-acetyl-tert. leucine chloroethyl ester after about 50% conversion, this being catalyzed by a protease from Bacillus licheniformis (Alcalase), and subsequent acidic saponification of the recovered ester. Among the methyl, ethyl, octyl, chloroethyl and trichloroethyl esters, the chloroethyl ester exhibited the highest rate of hydrolysis.
Facile asymmetric synthesis of α-amino acids employing chiral ligand-mediated asymmetric addition reactions of phenyllithium with imines
Hasegawa, Masayoshi,Taniyama, Daisuke,Tomioka, Kiyoshi
, p. 10153 - 10158 (2007/10/03)
A three-step methodology involving an external chiral ligand-mediated asymmetric addition of phenyllithium to an anisidine imine, oxidative removal of N-PMP group, and finally oxidative conversion of the phenyl group to a carboxyl group provides a facile synthesis of optically pure α-amino acid derivatives beating a bulky α-substituent. (C) 2000 Elsevier Science Ltd.
