6525-53-7Relevant articles and documents
A General Stereocontrolled Synthesis of Opines through Asymmetric Pd-Catalyzed N-Allylation of Amino Acid Esters
Albat, Dominik,Neud?rfl, J?rg-Martin,Schmalz, Hans-Günther
supporting information, p. 2099 - 2102 (2021/07/22)
A stereo-divergent synthesis of natural and unnatural opines in stereochemically pure form is based on the direct palladium-catalyzed N-allylation of α-amino acid esters (up to 97 % ee or 99 : 1 d.r.) using methyl (E)-2-penten-4-yl carbonate in the presence of only 1 mol% of a catalyst, prepared in-situ from the C2-symmetric diphosphine iPr-MediPhos and [Pd(allyl)Cl]2. Selected target compounds (incl. a derivative of the drug enalapril) were efficiently obtained from the N-allylated intermediates by oxidative cleavage (ozonolysis) of the allylic C=C bond under temporary N-Boc-protection.
Exploring the ability of dihydropyrimidine-5-carboxamide and 5-benzyl-2,4-diaminopyrimidine-based analogues for the selective inhibition of L. major dihydrofolate reductase
Bibi, Maria,Qureshi, Naveeda Akhter,Sadiq, Abdul,Farooq, Umar,Hassan, Abbas,Shaheen, Nargis,Asghar, Irfa,Umer, Duaa,Ullah, Azmat,Khan, Farhan A.,Salman, Muhammad,Bibi, Ahtaram,Rashid, Umer
, (2020/11/16)
To tackle leishmaniasis, search for efficient therapeutic drug targets should be pursued. Dihydrofolate reductase (DHFR) is considered as a key target for the treatment of leishmaniasis. In current study, we are interested in the design and synthesis of selective antifolates targeting DHFR from L. major. We focused on the development of new antifolates based on 3,4-dihydropyrimidine-2-one and 5-(3,5-dimethoxybenzyl)pyrimidine-2,4-diamine motif. Structure activity relationship (SAR) studies were performed on 4-phenyl ring of dihydropyrimidine (26–30) template. While for 5-(3,5-dimethoxybenzyl)pyrimidine-2,4-diamine, the impact of different amino acids (valine, tryptophan, phenylalanine, and glutamic acid) and two carbon linkers were explored (52–59). The synthesized compounds were assayed against LmDHFR. Compound 59 with the IC50 value of 0.10 μM appeared as potent inhibitors of L. major. Selectivity for parasite DHFR over human DHFR was also determined. Derivatives 55–59 demonstrated excellent selectivity for LmDHFR. Highest selectivity for LmDHFR was shown by compounds 56 (SI = 84.5) and 58 (SI = 87.5). Compounds Antileishmanial activity against L. major and L. donovani promastigotes was also performed. To explore the interaction pattern of the synthesized compounds with biological macromolecules, the docking studies were carried out against homology modelled LmDHFR and hDHFR targets.
Selenolysine: A New Tool for Traceless Isopeptide Bond Formation
Dardashti, Rebecca Notis,Kumar, Shailesh,Sternisha, Shawn M.,Reddy, Post Sai,Miller, Brian G.,Metanis, Norman
supporting information, p. 4952 - 4957 (2020/04/07)
Despite their biological importance, post-translationally modified proteins are notoriously difficult to produce in a homogeneous fashion by using conventional expression systems. Chemical protein synthesis or semisynthesis offers a solution to this problem; however, traditional strategies often rely on sulfur-based chemistry that is incompatible with the presence of any cysteine residues in the target protein. To overcome these limitations, we present the design and synthesis of γ-selenolysine, a selenol-containing form of the commonly modified proteinogenic amino acid, lysine. The utility of γ-selenolysine is demonstrated with the traceless ligation of the small ubiquitin-like modifier protein, SUMO-1, to a peptide segment of human glucokinase. The resulting polypeptide is poised for native chemical ligation and chemoselective deselenization in the presence of unprotected cysteine residues. Selenolysine's straightforward synthesis and incorporation into synthetic peptides marks it as a universal handle for conjugating any ubiquitin-like modifying protein to its target.
NOVEL PYRROLO-LACTONE AND PYRROLE COMPOUNDS INDUCING CELLULAR GLUTATHIONE RECOVERY EFFECT AGAINST REACTIVE OXYGEN SPECIES, AND METHOD FOR PREPARING THE SAME
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Paragraph 0102-0106; 0124; 0128; 0153; 0157, (2019/05/10)
The present invention provides: a novel pyrrolo-lactone compound, which can be used as an improved pain therapeutic agent containing various substituents by using glucose and ribose as reducing sugars and conducting a reaction with various kinds of natural and unnatural amino acids; and novel pyrrolo compounds produced during a process of manufacturing the same. The novel pyrrolo-lactone and pyrrole compounds are substances which can be used as improved pain therapeutic agent by having increased restoration ability of glutathione in living cells against reactive oxygen species.COPYRIGHT KIPO 2019
Method for synthesizing glutamic acid-1-methyl ester-5-tert-butyl ester
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Paragraph 0021; 0022, (2019/04/13)
The invention discloses a method for synthesizing glutamic acid-1-methyl ester-5-tert-butyl ester. The method comprises the following steps: generating dimethyl glutamate by using glutamic acid as aninitial raw material in methyl alcohol under the effect of thionyl chloride; reacting the dimethyl glutamate with triphenylchloromethane to generate dimethyl glutamate with triphenylmethyl protected amino; taking off methyl ester on the 5 position of the dimethyl glutamate with triphenylmethyl protected amino under the effect of sodium hydroxide to generate triphenylmethyl-glutamic acid-1-methyl ester; reacting the triphenylmethyl-glutamic acid-1-methyl ester-5-tert-butyl ester with trichloroacetic imine tert-butyl ester to generate triphenylmethyl-glutamic acid-1-methyl ester-5-tert-butyl ester, adding a small amount of triisopropylsilane into the triphenylmethyl-glutamic acid-1-methyl ester-5-tert-butyl ester in a low-concentration dichloromethane trifluoroacetate solution to take off triphenylmethyl to generate the glutamic acid-1-methyl ester-5-tert-butyl ester. The method is simple in operation, has few byproduct which can be extremely easy to treat and high product yield, and cansolve the problem of large operation difficulty in an existing synthesizing method.
Synthetic process of anti-hyperglycemic drug intermediate R-3-amino-piperidine dihydrochloride
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Paragraph 0052-0055, (2019/11/12)
The invention relates to a synthetic process of an anti-hyperglycemic drug intermediate R-3-amino-piperidine dihydrochloride. The synthetic process comprises the steps: using inexpensive L-glutamic acid as a starting material, and performing esterification, amino protection, reduction, hydroxyl protection, substitution, cyclization and removal of protecting groups for amino groups so as to obtainthe R-3-amino-piperidine dihydrochloride. Compared with the prior art, the synthetic process has cheap and easily available raw materials, good selectivity, good atomic economy, high total yield and mild reaction conditions, and is suitable for industrial production.
4-Iminooxazolidin-2-one as a Bioisostere of the Cyanohydrin Moiety: Inhibitors of Enterovirus 71 3C Protease
Ma, Yuying,Shang, Chengyou,Yang, Peng,Li, Linfeng,Zhai, Yangyang,Yin, Zheng,Wang, Binghe,Shang, Luqing
supporting information, p. 10333 - 10339 (2018/12/11)
A recently reported potent inhibitor of enterovirus 71 3C protease, (R)-1, was found to have stability and potential toxicity issues due to the presence of a cyanohydrin moiety. Modifying the labile cyanohydrin moiety, by serendipity, led to the discovery of 4-iminooxazolidin-2-one-based inhibitors 4e and 4g with potent inhibitory activity and significantly improved stability. In vivo pharmacokinetic studies of 4e also demonstrated high plasma exposure and moderate half-life. These compounds have shown potential of becoming anti-EV71 drug candidates.
CALPAIN MODULATORS AND METHODS OF PRODUCTION AND USE THEREOF
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Paragraph 00444, (2017/09/27)
The present technology relates to compounds, kits, compositions, and methods useful for the treatment of fibrotic disease. In some aspects, the present technology provides for treatment of various diseases or disorders associated or mediated, at least in part, by calpains, such as CAPN1, CAPN2, and/or CAPN9. The present technology is generally applicable to compounds which inhibit myofibroblast differentiation.
Synthesis and photodynamic activity of unsymmetrical A3B tetraarylporphyrins functionalized with l-glutamate and their Zn(II) and Cu(II) metal complex derivatives
Arredondo-Espinoza, Eder U.,López-Cortina, Susana T.,Ramírez-Cabrera, Mónica A.,Balderas-Rentería, Isaías
, p. 327 - 336 (2016/06/01)
Four novel unsymmetrical A3B porphyrins 1, 2, 3 and 4 were synthesized following Lindsey procedure. Porphyrins 3 and 4 include one and three l-glutamate groups, respectively, and all porphyrins were metallated with Zn(II) (1a-4a) or Cu(II) (1b-4b). Porphyrins and metalloporphyrins presented values of singlet oxygen quantum yields (ΦD) ranging from 0.21 to 0.67. The tetraaryl derivatives in this study showed phototoxicity in SiHa cells with IC50 values ranging from 50 value. Comparing the phototoxic activity between all porphyrins, functionalization of porphyrins with glutamate increased 100 times phototoxic activity (1 (IC50 4.81 ± 0.34 μM) vs. 3 (IC50 0.04 ± 0.02 μM) and 2 (IC50 5.19 ± 0.42 μM) vs. 4 (IC50 0.05 ± 0.01 μM)). This increased activity could be attributed to reduced hydrophobicity and increased Φδ, given by functionalization with l-glutamate. Metalloporphyrins 3a (IC50 0.04 ± 0.01 μM) and 4a (IC50 0.01 μM) presented the best values of phototoxic activity. Therefore, functionalization and zinc metalation increased the phototoxic activity. SiHa cells treated with porphyrins 3, 4, 3a and 4a at a final concentration of 10 μM, showed increased activity of caspase-3 enzyme compared to the negative control; indicating the induction of apoptosis. Differential gene expression pattern in SiHa cells was determined; treatments with metalloporphyrins 4a and 4b were performed, respectively, comparing the expression with untreated control. Treatments in both cases showed similar gene expression pattern in upregulated genes, since they share about 25 biological pathways and a large number of genes. According to the new photophysical properties related to the structural improvement and phototoxic activity, these molecules may have the potential application as photosensitizers in the photodynamic therapy.
Expeditious synthesis of enantiopure, orthogonally protected bis-α-amino acids (OPBAAs) and their use in a study of Nod1 stimulation
Chen, Po-Ting,Lin, Cheng-Kun,Tsai, Chih-Ju,Huang, Duen-Yi,Nien, Fu-Yao,Lin, Wan-Wan,Cheng, Wei-Chieh
supporting information, p. 474 - 482 (2015/01/30)
A convenient approach towards the synthesis of orthogonally protected chiral bis-a-amino acids (OPBAAs) is described. The key transformations include: (1) a highly stereoselective conjugation (alkylation) of the Sch?llkopf bislactim ethers and oxazolidinyl alkyl halides to build a backbone skeleton; and (2) our orthogonal protection strategy. A series of enantiopure OPBAAs bearing a variety of alkyl chain as a spacer; two stereogenic centers; and three protecting groups were prepared as examples. These versatile molecules were applied to the synthesis of biologically interesting di- or tri-peptide analogues, including chiral iE-meso-DAP and A-iE-meso-DAP, for the study of Nod1 activation in the innate immune response.
