- The effect of urea moiety in amino acid binding by β-cyclodextrin derivatives: A 1000-fold increase in efficacy comparing to native β-cyclodextrin
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Water soluble amphiphilic anion receptors based on urea-substituted β-cyclodextrin were synthesized via a copper(I) mediated azide-alkyne coupling reaction. The synthetic route was designed to minimize the number of operations of cyclodextrins. Stable pro
- Stepniak, Pawel,Lainer, Bruno,Chmurski, Kazimierz,Jurczak, Janusz
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- Synthesis and renin inhibitory activity of angiotensinogen analogues having dehydrostatine, Leuψ[CH2S]Val, or Leuψ[CH2SO]Val at the P1-P1' cleavage site
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The synthesis and in vitro renin inhibitory potencies of angiotensinogen (ANG) analogues having amide (CONH) bond replacements at P1-P1', the Leu-Val cleavage site, corresponding to Leuψ[CH2S]Val, Leuψ[CH2SO]Val
- Smith,Saneii,Sawyer,Pals,Scahill,Kamdar,Lawson
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Read Online
- Design, synthesis, and structure-activity relationship studies of L-amino alcohol derivatives as broad-spectrum antifungal agents
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To discover broad spectrum antifungal agents, two strategies were applied, and a novel class of L-amino alcohol derivatives were designed and synthesized. 3-F substituted compounds 14i, 14n, 14s and 14v exhibited excellent antifungal activities with broad antifungal spectra against C. albicans and C. tropicalis, with MIC values in the range of 0.03–0.06 μg/mL, and against A. fumigatus and C. neoformans, with MIC values in the range of 1–2 μg/mL. Notably, Compounds 14i, 14n, 14s and 14v also displayed moderate activities against fluconazole-resistance strains 17# and CaR that were isolated from AIDS patients. Moreover, only compounds in the S-configuration showed antifungal activity. Preliminary mechanistic studies showed that the potent antifungal activity of compound 14v stemmed from inhibition of C. albicans CYP51. Compounds 14n and 14v were almost nontoxic to mammalian A549 cells, and their stability in human plasma was excellent.
- Zhao, Liyu,Tian, Linfeng,Sun, Nannan,Sun, Yin,Chen, Yixuan,Wang, Xinran,Zhao, Shizhen,Su, Xin,Zhao, Dongmei,Cheng, Maosheng
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p. 374 - 385
(2019/06/05)
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- A rapid entry to amino acid derived diverse 3,4-dihydropyrazines and dihydro[1,2,3]triazolo[1,5-a]pyrazines through 1,3-dipolar cycloaddition
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An efficient, general and practical synthesis of diverse 3,4-dihydropyrazines, 6,7-dihydro-[1,2,3]triazolopyrazines and 7,8-dihydro-[1,2,3]triazolodiazepines through intramolecular 1,3-dipolar cycloaddition from amino acid derived common intermediates with high yields is described. Moreover, one-pot access to optically active 3-aryl substituted 6,7-dihydro-[1,2,3]triazolo[1,5-a]pyrazines in the palladium-copper co-catalytic system has also been achieved in this work. The easy substrate availability and operational simplicity make the process suitable for further exploration. This journal is the Partner Organisations 2014.
- Bera, Saurav,Panda, Gautam
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p. 3976 - 3985
(2014/06/09)
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- BENZOIMIDAZOLE-CARBOXYLIC ACID AMIDE DERIVATIVES AS APJ RECEPTOR MODULATORS
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The present invention relates to benzoimidazole-carboxylic acid amide compounds of the formula I, in which R', R", R"', R1, R2, R3, R4, R5, R6 and Z are defined as indicated below. The comp
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Page/Page column 342; 343
(2014/04/04)
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- BENZOIMIDAZOLE-CARBOXYLIC ACID AMIDE DERIVATIVES AS APJ RECEPTOR MODULATORS
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The present invention relates to benzoimidazole-carboxylic acid amide compounds of the formula I, in which R′, R″, R′″, R1, R2, R3, R4, R5, R6 and Z are defined as indicated below. The comp
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Paragraph 1902-1904
(2014/04/17)
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- Syntheis of new chiral 5,6,7,8-tetrahydrotetrazolo[1,5-a]pyrazines from α-amino acid derivatives following "click" chemistry
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An efficient and practical synthesis of new chiral fused tetrazoles have been synthesized following [3+2] cycloaddition reaction starting from α-amino acid derivatives.
- Mohapatra, Debendra K.,Maity, Pradip K.,Ghorpade, Ravindra V.,Gurjar, Mukund K.
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scheme or table
p. 865 - 872
(2010/09/16)
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- Synthesis of new chiral 4,5,6,7-tetrahydro[1,2,3]triazolo[1,5-a]pyrazines from α-amino acid derivatives under mild conditions
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A practical and efficient regioselective synthesis of several new chiral 4,5,6,7-tetrahydro[1,2,3]triazolo[1,5-a]pyrazines is described from α-amino acid derivatives following intramolecular 'click' reaction as the key step. The method obviates product pu
- Mohapatra, Debendra K.,Maity, Pradip K.,Gonnade, Rajesh G.,Chorghade, Mukund S.,Gurjar, Mukund K.
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p. 1893 - 1896
(2008/03/13)
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- Stereoselective synthesis of 2-alkenylaziridines and 2-alkenylazetidines by palladium-catalyzed intramolecular amination of α- and β-amino allenes
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Whereas palladium-catalyzed reaction of N-arylsulfonyl-α-amino allenes with an aryl iodide (4 equiv) in the presence of potassium carbonate (4 equiv) in DMF at around 70 °C affords the corresponding 3-pyrroline derivatives, the reaction in refluxing 1,4-dioxane under otherwise identical conditions yields exclusively or most predominantly the corresponding 2-alkenylaziridines bearing an aryl group on the double bond. Similarly, N-arylsulfonyl-β-amino allenes can be also cyclized into the corresponding alkenylazetidines bearing a 2,4-cis-configuration under palladium-catalyzed cyclization conditions in DMF.
- Ohno,Anzai,Toda,Ohishi,Fujii,Tanaka,Takemoto,Ibuka
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p. 4904 - 4914
(2007/10/03)
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- New chiral auxiliaries for the construction of quaternary stereocenters by copper-catalyzed Michael reactions
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The construction of quaternary stereocenters with 95-99% ee at ambient temperatures can be achieved by a copper-catalyzed Michael reaction with the application of α-amino acid amides as chiral auxiliaries [Eq. (1)]. These amides can be obtained in a few steps from the α-amino acids with standard transformations and, after the Michael reaction, they can be quantitatively recovered. Exclusion of water and oxygen is not necessary.
- Christoffers, Jens,Mann, Alexander
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p. 2752 - 2754
(2007/10/03)
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- Chemoenzymatic synthesis of 4-amino-2-hydroxy acids: A comparison of mutant and wild-type oxidoreductases
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We describe a new chemoenzymatic synthesis of enantiopure 4-amino-2-hydroxy acids using two biotransformations in a single-pot process in aqueous medium. These compounds are valuable as γ-turn mimics for investigations into the secondary structure of peptides. The enzyme substrates are a series of carbobenzyloxy (CBZ)-protected 4-amino-2-keto esters, prepared efficiently from the L-amino acids, alanine, leucine, phenylalanine, and valine. First, the α-amino acids were converted to the corresponding β-amino acids in a simple five-step procedure. A further one-carbon homologation via ozonolysis of the corresponding β-keto cyanophosphoranes gave the required α-keto esters in good yield. The enzyme catalyzed hydrolyses of all the α-keto esters to the corresponding α-keto acids proceeded smoothly with the lipase from Candida rugosa. Using the same reaction pot, it was found that wild-type lactate dehydrogenases from either Bacillus stearothermophilus CBS-LDH) or Staphylococcus epidermidis (SE-LDH) could be used to specifically reduce the ketone of the alanine-derived α-keto acid 2, giving the (S)- and CR)-2-hydroxy acids, respectively, in good yields. However, the more bulky α-keto acids 3, 4, and 5 (derived from valine, leucine, and phenylalanine) were not substrates for these enzymes. In contrast, the genetically engineered H205Q mutant of D-hydroxyisocaproate dehydrogenase proved to be an ideal catalyst for the reduction of all the α-keto acids 2-5, giving excellent yields of the CBZ-protected (2R,4S)-4-amino2-hydroxy acids as single diastereomers. This genetically engineered oxidoreductase has great potential value in synthesis due to its broad substrate specificity and high catalytic activity. For example, reduction of 1 mmol of N-protected (S)-4-amino-2-oxopentanoic acid 2 took just 4 h with the H205Q mutant giving, after esterification, the CR)-2-alcohol 25 in 85% yield, whereas with SE-LDH the reaction required 4 days to give a 67% yield of 25.
- Sutherland, Andrew,Willis, Christine L.
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p. 7764 - 7769
(2007/10/03)
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- Potent and systemically active aminopeptidase N inhibitors designed from active-site investigation
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Derivatives of amino acids bearing various zinc-coordinating moieties (SH, COOH, CONHOH, and PO3H2) were synthesized and tested for their ability to inhibit aminopeptidase N (APN). Among them, β-amino thiols were found to be the most
- Fournie-Zaluski,Coric,Turcaud,Bruetschy,Lucas,Noble,Roques
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p. 1259 - 1266
(2007/10/02)
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- Synthesis of Enkephalin Analog with Leucinthiol at C-terminus as Probe for Thiol Group In Opiate Receptors
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Enkephalin analog with thiol group at C-terminus, 2,Leu(CH2SH)5>enkephalin, was synthesized as possible probe for the essential thiol group in opiate receptors.In order to protect the free SH group of leucinthiol, oxidized Boc-
- Kondo, Michio,Uchida, Hiroaki,Kodama, Hiroaki,Kitajima, Hiroshi,Shimohigashi, Yasuyuki
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p. 997 - 1000
(2007/10/02)
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- INHIBITORS OF HUMAN LEUCOCYTE ELASTASE. PEPTIDES INCORPORATING AN &α-AZANORVALINE RESIDUE OR A THIOMETHYLENE LINKAGE IN PLACE OF A PEPTIDE BOND
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Peptides containing an α-azanorvaline residue at the C-terminus and N- group at the N-terminus have been made as inhibitors of human leucocyte elastase.A number of analogues with an amide bond replaced by a thiomethylene group have also been prepared.The analogues were tested against leucocyte elastase using MeO-Suc-Ala-Ala-Pro-Val-p-nitroanilide as a substrate and the results were obtained as IC50 values.Both types of analogues inhibited the leucocyte elastase; the most potent of these was N--L-valyl-L-prolyl-α-azanorvaline phenyl ester ( 2 ) ( IC50 0.28 μM, Ki 0.02 μM ).
- Dutta, Anand S.,Giles, Michael, B.,Gormley, James J.,Williams, Joseph C.,Kusner, Edward J.
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p. 111 - 120
(2007/10/02)
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