21685-47-2Relevant articles and documents
N-Pyrazinoyl substituted amino acids as potential antimycobacterial agents-the synthesis and biological evaluation of enantiomers
Bárta, Pavel,Dole?al, Martin,Horá?ek, Ond?ej,Jand'Ourek, Ond?ej,Janou?ek, Ji?í,Juhás, Martin,Kone?ná, Klára,Ku?era, Radim,Ku?erová, Lucie,Kubí?ek, Vladimír,Kune?, Ji?í,Paterová, Pavla,Zitko, Jan
, (2020/04/09)
Tuberculosis is an infectious disease caused by Mycobacterium tuberculosis (Mtb), each year causing millions of deaths. In this article, we present the synthesis and biological evaluations of new potential antimycobacterial compounds containing a fragment of the first-line antitubercular drug pyrazinamide (PZA), coupled with methyl or ethyl esters of selected amino acids. The antimicrobial activity was evaluated on a variety of (myco)bacterial strains, including Mtb H37Ra, M. smegmatis, M. aurum, Staphylococcus aureus, Pseudomonas aeruginosa, and fungal strains, including Candida albicans and Aspergillus flavus. Emphasis was placed on the comparison of enantiomer activities. None of the synthesized compounds showed any significant activity against fungal strains, and their antibacterial activities were also low, the best minimum inhibitory concentration (MIC) value was 31.25 μM. However, several compounds presented high activity against Mtb. Overall, higher activity was seen in derivatives containing l-amino acids. Similarly, the activity seems tied to the more lipophilic compounds. The most active derivative contained phenylglycine moiety (PC-d/l-Pgl-Me, MIC 1.95 μg/mL). All active compounds possessed low cytotoxicity and good selectivity towards Mtb. To the best of our knowledge, this is the first study comparing the activities of the d- and l-amino acid derivatives of pyrazinamide as potential antimycobacterial compounds.
Method for preparing amino ether compounds
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Paragraph 0061; 0064; 0065, (2017/08/26)
The invention belongs to the technical field of organic synthesis and relates to a method for preparing amino ether compounds. The method comprises the following steps: by taking amino alcohol as a raw material, protecting amino in the amino alcohol so as to obtain Schiff base; carrying out an etherification reaction on the hydroxyl group in the Schiff base; and finally, performing amino deprotection, thereby obtaining corresponding amino ethers. The method disclosed by the invention has high regio-selectivity, the substrates of higher than 99.9% are subjected to etherification reaction, the reaction conversion ratio of each step is higher than 99.8%, and the total yield is higher than 95%; when amino alcohol is chiral, the amino ethers with retention of configuration can be obtained; and moreover, each step of the method is a conventional operation, the process cost is low, and three wastes are few, the energy consumption is low, an environment-friendly effect is achieved, and large-scale industrial production is easily realized.
In situ deprotection and incorporation of unnatural amino acids during cell-free protein synthesis
Arthur, Isaac N.,Hennessy, James E.,Padmakshan, Dharshana,Stigers, Dannon J.,Lesturgez, Stéphanie,Fraser, Samuel A.,Liutkus, Mantas,Otting, Gottfried,Oakeshott, John G.,Easton, Christopher J.
supporting information, p. 6824 - 6830 (2013/06/26)
The S30 extract from E. coli BL21 Star (DE3) used for cell-free protein synthesis removes a wide range of α-amino acid protecting groups by cleaving α-carboxyl hydrazides; methyl, benzyl, tert-butyl, and adamantyl esters; tert-butyl and adamantyl carboxamides; α-amino form-, acet-, trifluoroacet-, and benzamides and sidechain hydrazides and esters. The free amino acids are produced and incorporated into a protein under standard conditions. This approach allows the deprotection of amino acids to be carried out in situ to avoid separate processing steps. The advantages of this approach are demonstrated by the efficient incorporation of the chemically intractable (S)-4-fluoroleucine, (S)-4,5- dehydroleucine, and (2S,3R)-4-chlorovaline into a protein through the direct use of their respective precursors, namely, (S)-4-fluoroleucine hydrazide, (S)-4,5-dehydroleucine hydrazide, and (2S,3R)-4-chlorovaline methyl ester. These results also show that the fluoroand dehydroleucine and the chlorovaline are incorporated into a protein by the normal biosynthetic machinery as substitutes for leucine and isoleucine, respectively. Copyright
