1155-62-0Relevant articles and documents
Effect of freezing on the enzymatic coupling of specific amino acid-containing peptide fragments
Wehofsky, Nicole,Haensler, Marion,Kirbach, Sebastian W.,Wissmann, Johannes-Dieter,Bordusa, Frank
, p. 2421 - 2428 (2000)
The effect of freezing on the enzymatic coupling of highly specific amino acid-containing peptide fragments was investigated using trypsin, α-chymotrypsin, and Bacillus licheniformis Glu-specific endopeptidase as biocatalysts. Comparison with reactions at normal temperature indicates that freezing efficiently represses the cleavage of specific peptide bonds independent of their individual localisation and specificity achieving irreversible and efficient peptide bond formation without proteolytic side reactions. Copyright (C) 2000 Elsevier Science Ltd.
Preparation method of (S)-1 - (benzyloxycarbonyl) -5 -oxo-pyrrolidine -2 - formic acid
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Paragraph 0014; 0018; 0022; 0026; 0030; 0034, (2021/09/01)
The invention discloses a preparation method of (S)-1 - (benzyloxycarbonyl) -5 -oxo-pyrrolidine -2 - formic acid, which mainly solves the complexity in the original process, and is long in period and high in cost. The method specifically comprises first steps of preparing L - benzyloxycarbonyl N - glutamic acid from - L - glutamic acid and a benzyloxycarbonyl donor, second steps of intramolecular condensation cyclization N - benzyloxycarbonyl - L - glutamic acid to obtain the N -benzyloxycarbonyl - L - glutamic acid crude product. The third The crude N - benzyloxycarbonyl - L - glutamic acid crude product and the organic amine base are mixed, and the organic amine salt form is prepared by the solubility of the product in a solvent, fourth (N -) - L - (benzyloxycarbonyl) S oxopyrrolidine -1 - formic acid is prepared by desalinating -5 - benzyloxycarbonyl -2 - glutamic acid. To the method, the high-purity product is prepared, and the yield and the quality are greatly improved.
PROCESSES FOR PREPARATION OF (S)-TERT-BUTYL 4,5-DIAMINO-5-OXOPENTANOATE
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Paragraph 00316; 00321, (2019/03/12)
Provided are processes for the preparation of (S)-tert-butyl 4,5-diamino-5-oxopentanoate, or a salt, solvate, hydrate, enantiomer, mixture of enantiomers, or isotopologue thereof. Also provided are solid forms of various intermediates and products obtained from the processes.
A method for the preparation of amine to that (by machine translation)
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Paragraph 0035; 0041; 0042; 0055; 0056; 0069; 0070, (2018/07/30)
The invention discloses a method for the preparation of amine to that, the specific step includes: to 2 - methyl - 3 - nitro benzoic acid as the raw material, to obtain 2 - bromomethyl - 3 - nitro-benzoic acid methyl ester; L - glutamic acid as the raw material to make the N - CBZ - L - glutamic acid; to N - CBZ - L - glutamic acid as the raw material to make the 3 - amino - 2, 6 - piperidine dione hydrochloride; to 2 - methyl - 3 - nitro-benzoic acid methyl ester with 3 - amino - 2, 6 - piperidine dione hydrochloride as the raw material to make the 3 - (4 - nitro - 1, 3 dihydro - 1 - oxo - 2 hydrogen - isoindol - 2 - yl) piperidine - 2, 6 - dione; to 3 - (4 - nitro - 1, 3 dihydro - 1 - oxo - 2 hydrogen - isoindol - 2 - yl) piperidine - 2, 6 - dione as raw materials to that amine. The method of the invention has simple technological process, raw material economic, few by-products, and purification is simple, high yield, environment-friendly and the like, after treatment is simple, has better practicability and application value, has great industrial prospects. (by machine translation)
Synthesis of fully protected (2R,3R,4S)-4-amino-7-guanidino-2,3-dihydroxy heptanoic acid
Yoshino, Ryo,Tokairin, Yoshinori,Konno, Hiroyuki
supporting information, p. 1604 - 1606 (2017/04/03)
(2R,3R,4S)-4-Amino-7-guanidino-2,3-dihydroxyheptanoic acid (AGDHE), a common constituent of biologically active marine peptides, callipeltin A (1) and neamphamide A, was synthesized as its orthogonally protected derivative from L-glutamic acid in 15 steps. Guanidination by the Mitsunobu condition and osmium-catalyzed dihydroxylation of the corresponding Z-olefin were employed as the key steps.
Synthesis and Kinetic Characterisation of Water-Soluble Fluorogenic Acyl Donors for Transglutaminase 2
Wodtke, Robert,Schramm, Georg,Pietzsch, Jens,Pietsch, Markus,L?ser, Reik
, p. 1263 - 1281 (2016/10/19)
Small glutamate-containing peptides bearing coumarin derivatives as fluorescent leaving groups attached to the γ-carboxylic acid group of the Glu residue were synthesised and investigated with regard to their potential to act as substrates for transglutam
Synthesis and physicochemical characterization of the impurities of pemetrexed disodium, an anticancer drug
Michalak, Olga,Gruza, Mariusz M.,Witkowska, Anna,Bujak, Iwona,Cmoch, Piotr
, p. 10004 - 10031 (2015/08/06)
A physicochemical characterization of the process-related impurities associated with the synthesis of pemetrexed disodium was performed. The possibility of pemetrexed impurities forming has been mentioned in literature, but no study on their structure has been published yet. This paper describes the development of the synthesis methods for these compounds and discusses their structure elucidation on the basis of two-dimensional NMR experiments and MS data. The identification of these impurities should be useful for the quality control during the production of the pemetrexed disodium salt.
Total synthesis of (-)-platensimycin by advancing oxocarbenium- and iminium-mediated catalytic methods
Eey, Stanley T.-C.,Lear, Martin J.
, p. 11556 - 11573 (2015/01/16)
(-)-Platensimycin is a potent inhibitor of fatty acid synthase that holds promise in the treatment of metabolic disorders (e.g., diabetes and "fatty liver") and pathogenic infections (e.g., those caused by drug-resistant bacteria). Herein, we describe its total synthesis through a four-step preparation of the aromatic amine fragment and an improved stereocontrolled assembly of the ketolide fragment, (-)-platensic acid. Key synthetic advances include 1) a modified Lieben haloform reaction to directly convert an aryl methyl ketone into its methyl ester within 30 seconds, 2) an experimentally improved dialkylation protocol to form platensic acid, 3) a sterically controlled chemo- and diastereoselective organocatalytic conjugate reduction of a spiro-cyclized cyclohexadienone by using the trifluoroacetic acid salt of α-amino di-tert-butyl malonate, 4) a tetrabutylammonium fluoride promoted spiro-alkylative para dearomatization of a free phenol to assemble the cagelike ketolide core with the moderate leaving-group ability of an early tosylate intermediate, and 5) a bismuth(III)-catalyzed Friedel-Crafts cyclization of a free lactol, with LiClO4 as an additive to liberate a more active oxocarbenium perchlorate species and suppress the Lewis basicity of the sulfonyloxy group. The longest linear sequence is 21 steps with an overall yield of 3.8% from commercially available eugenol. Relay tactics: The stereocontrolled assembly of the potent antibiotic (-)-platensimycin in 21 steps and 3.8% yield from eugenol is described (see scheme; TBAF: tetrabutylammonium fluoride; Ts: toluene-4-sulfonyl). Highlights are 1) a rapid oxidative esterification of an acyl aromatic, 2) a reliable dialkylation protocol to form platensic acid, 3) a π-facial conjugate reduction of a dienone, 4) a TBAF-promoted alkylative dearomatization of a free phenol, and 5) a Friedel-Crafts closure of a free lactol.
Synthesis and anticonvulsant activity of (R)- and (S)-3-(Carbobenzyloxy- amino-1-glutarimidooxy)esters
Lee, Do-Hun
, p. 8125 - 8127 (2013/09/23)
A series of (R)- and (S)-3-carbobenzyloxy-amino-1-glutarimidooxy-esters (5a-e) ((R)-and (S)-methyl-1-(3-carbobenzyloxy-amino-I glutarimidooxy)acetate (5a), (R)-and (S)-ethyl-1-(3-carbobenzyloxy-amino-glutarimidooxy)acetate (5b), (R)- and (S)-ethyl-1-(3-carbo-benzyloxy-amino-glutarimidooxy)propionate (5c), (R)- and (S)-methyl-2-(3-carbobenzyloxy-amino-glutarimidooxy)butyrate (5d), (R)- and (S)-ethyl-2-(3-carbobenzyloxy-amino-glutarimidooxy)butyrate (5e) were synthesized and investigated their anticonvulsant activities.
Synthesis and relaxometric characterization of a MRI Gd-based probe responsive to glutamic acid decarboxylase enzymatic activity
Napolitano, Roberta,Pariani, Giorgio,Fedeli, Franco,Baranyai, Zsolt,Aswendt, Markus,Aime, Silvio,Gianolio, Eliana
, p. 2466 - 2477 (2013/05/08)
Novel contrast agent based systems, which selectively visualize specific cells, e.g., neurons in the brain, would be of substantial importance for the fast developing field of molecular magnetic resonance imaging (MRI). We report here the synthesis and in vitro validation of a Gd(III)-based contrast agent designed to act as an MRI responsive probe for imaging the activity of the enzyme glutamic acid decarboxylase (GAD) present in neurons. Upon the action of the enzyme, the Gd(III) complex increases its hydration sphere and takes on a residual positive charge that promotes its binding to endogenous macromolecules. Both effects contribute in a synergic way to generate a marked relaxation enhancement, which directly reports enzyme activity and will allow activity detection of GAD positive cells in vitro and in vivo selectively.