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Mazzini S, Princiotto S, Musso L, Passarella D, Beretta GL, Perego P, Dallavalle S. Synthesis and Investigation of the G-Quadruplex Binding Properties of Kynurenic Acid Derivatives with a Dihydroimidazoquinoline-3,5-dione Core. Molecules 2022; 27:2791. [PMID: 35566141 PMCID: PMC9103425 DOI: 10.3390/molecules27092791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 04/21/2022] [Accepted: 04/25/2022] [Indexed: 11/16/2022] Open
Abstract
G-quadruplexes are secondary structures originating from nucleic acid regions rich in guanines, which are well known for their involvement in gene transcription and regulation and DNA damage repair. In recent studies from our group, kynurenic acid (KYNA) derivative 1 was synthesized and found to share the structural features typical of G-quadruplex binders. Herein, structural modifications were conducted on this scaffold in order to assist the binding with a G-quadruplex, by introducing charged hydrophilic groups. The antiproliferative activity of the new analogues was evaluated on an IGROV-1 human ovarian cancer cell line, and the most active compound, compound 9, was analyzed with NMR spectrometry in order to investigate its binding mode with DNA. The results indicated that a weak, non-specific interaction was set with duplex nucleotides; on the other hand, titration in the presence of a G-quadruplex from human telomere d(TTAGGGT)4 showed a stable, although not strong, interaction at the 3'-end of the nucleotidic sequence, efficiently assisted by salt bridges between the quaternary nitrogen and the external phosphate groups. Overall, this work can be considered a platform for the development of a new class of potential G-quadruplex stabilizing molecules, confirming the crucial role of a planar system and the ability of charged nitrogen-containing groups to facilitate the binding to G-quadruplex grooves and loops.
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Affiliation(s)
- Stefania Mazzini
- Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Celoria 2, 20133 Milan, Italy; (S.M.); (L.M.); (S.D.)
| | - Salvatore Princiotto
- Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Celoria 2, 20133 Milan, Italy; (S.M.); (L.M.); (S.D.)
| | - Loana Musso
- Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Celoria 2, 20133 Milan, Italy; (S.M.); (L.M.); (S.D.)
| | | | - Giovanni Luca Beretta
- Molecular Pharmacology Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale Tumori, Via Amadeo 42, 20133 Milan, Italy; (G.L.B.); (P.P.)
| | - Paola Perego
- Molecular Pharmacology Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale Tumori, Via Amadeo 42, 20133 Milan, Italy; (G.L.B.); (P.P.)
| | - Sabrina Dallavalle
- Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Celoria 2, 20133 Milan, Italy; (S.M.); (L.M.); (S.D.)
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Jiang J, Zu G, Shi Y, Liu X, Wang X, Wang X. Synthesis of amphoteric fluorescent copolymers: materials exhibiting multicolor photophysical properties. Methods Appl Fluoresc 2020; 8:035008. [PMID: 32428879 DOI: 10.1088/2050-6120/ab947e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Six emissive amphoteric copolymers were prepared and characterized (1H NMR, DSC, steady-state UV-vis, and emission spectroscopy) in the paper. A system of multi-color emitters, composed of P1 (green and yellow), P2 (green), P3 (red), P4 (blue), P5 (yellow) and P6 (green and yellow), were presented. P5 showed multicolor fluorescence that belonged to the color-specially emissive system at different excitation wavelengths, and P6 exhibited color-correlated emission by efficient energy transfer.
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Affiliation(s)
- Jie Jiang
- College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, People's Republic of China. Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People's Republic of China
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Heravi MM, Zadsirjan V, Hamidi H, Daraie M, Momeni T. Recent applications of the Wittig reaction in alkaloid synthesis. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2020; 84:201-334. [PMID: 32416953 DOI: 10.1016/bs.alkal.2020.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The Wittig reaction is the chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide (the Wittig reagent) to afford an alkene and triphenylphosphine oxide. Noteworthy, this reaction results in the synthesis of alkenes in a selective and predictable fashion. Thus, it became as one of the keystone of synthetic organic chemistry, especially in the total synthesis of natural products, where the selectivity of a reaction is paramount of importance. A literature survey disclosed the existence of vast numbers of related reports and comprehensive reviews on the applications of this important name reaction in the total synthesis of natural products. However, the aim of this chapter is to underscore, the applications of the Wittig reaction in the total synthesis of one the most important and prevalent classes of natural products, the alkaloids, especially those showing important and diverse biological activities.
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Affiliation(s)
- Majid M Heravi
- Department of Chemistry, School of Science, Alzahra University, Tehran, Iran.
| | - Vahideh Zadsirjan
- Department of Chemistry, School of Science, Alzahra University, Tehran, Iran
| | - Hoda Hamidi
- Department of Chemistry, School of Science, Alzahra University, Tehran, Iran
| | - Mansoureh Daraie
- Department of Chemistry, School of Science, Alzahra University, Tehran, Iran
| | - Tayebeh Momeni
- Department of Chemistry, School of Science, Alzahra University, Tehran, Iran
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4
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Patel DV, Patel NR, Kanhed AM, Patel SP, Sinha A, Kansara DD, Mecwan AR, Patel SB, Upadhyay PN, Patel KB, Shah DB, Prajapati NK, Murumkar PR, Patel KV, Yadav MR. Novel Multitarget Directed Triazinoindole Derivatives as Anti-Alzheimer Agents. ACS Chem Neurosci 2019; 10:3635-3661. [PMID: 31310717 DOI: 10.1021/acschemneuro.9b00226] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The multifaceted nature of Alzheimer's disease (AD) demands treatment with multitarget-directed ligands (MTDLs) to confront the key pathological aberrations. A novel series of triazinoindole derivatives were designed and synthesized. In vitro studies revealed that all the compounds showed moderate to good anticholinesterase activity; the most active compound 23e showed an IC50 value of 0.56 ± 0.02 μM for AChE and an IC50 value of 1.17 ± 0.09 μM for BuChE. These derivatives are also endowed with potent antioxidant activity. To understand the plausible binding mode of the compound 23e, molecular docking studies and molecular dynamics simulation studies were performed, and the results indicated significant interactions of 23e within the active sites of AChE as well as BuChE. Compound 23e successfully diminished H2O2-induced oxidative stress in SH-SY5Y cells and displayed excellent neuroprotective activity against H2O2 as well as Aβ-induced toxicity in SH-SY5Y cells in a concentration dependent manner. Furthermore, it did not show any significant toxicity in neuronal SH-SY5Y cells in the cytotoxicity assay. Compound 23e did not show any acute toxicity in rats at doses up to 2000 mg/kg, and it significantly reversed scopolamine-induced memory deficit in mice model. Additionally, compound 23e showed notable in silico ADMET properties. Taken collectively, these findings project compound 23e as a potential balanced MTDL in the evolution process of novel anti-AD drugs.
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Affiliation(s)
- Dushyant V. Patel
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Nirav R. Patel
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Ashish M. Kanhed
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Sagar P. Patel
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Anshuman Sinha
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Deep D. Kansara
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Annie R. Mecwan
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Sarvangee B. Patel
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Pragnesh N. Upadhyay
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Kishan B. Patel
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Dharti B. Shah
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Navnit K. Prajapati
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Prashant R. Murumkar
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Kirti V. Patel
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
| | - Mange Ram Yadav
- Faculty of Pharmacy, Kalabhavan Campus, The Maharaja Sayajirao University of Baroda, Vadodara-390001 Gujarat, India
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Du BX, Quan ZJ, Da YX, Zhang Z, Wang XC. Chemo-Controlled Cross-Coupling of Di(hetero)aryl Disulfides with Grignard Reagents: CCvs.CS Bond Formation. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201400980] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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6
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Zaręba P, Dudek M, Lustyk K, Siwek A, Starowicz G, Bednarski M, Nowiński L, Raźny K, Sapa J, Malawska B, Kulig K. α-Adrenoceptor antagonistic and hypotensive properties of novel arylpiperazine derivatives of pyrrolidin-2-one. Bioorg Med Chem 2015; 23:2104-11. [PMID: 25813897 DOI: 10.1016/j.bmc.2015.03.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 02/26/2015] [Accepted: 03/02/2015] [Indexed: 11/26/2022]
Abstract
This study focused on a series of pyrrolidin-2-one derivatives connected via two or four methylene units to arylpiperazine fragment. The compounds obtained for α₁- and α₂-adrenoceptors were assessed. The compound with highest affinity for the α₁-adrenoceptors was 1-{4-[4-(2-chloro-phenyl)-piperazin-1-yl]-butyl}-pyrrolidin-2-one (10 h) with pKi=7.30. Compound with pKi (α₁) ⩾6.44 were evaluated in functional bioassays for intrinsic activity at α₁A- and α₁B-adrenoceptors. All compounds tested were antagonists of the α₁B-adrenoceptors. Additionally, compounds 10e and 10h were α₁A-adrenoceptors antagonist. The dual α₁A-/α₁B-adrenoceptors antagonists, compounds 10e and 10h were also tested in vivo for their hypotensive activity in rats. These compounds, when dosed of 1.0 mg/kg iv in normotensive, anesthetized rats, significantly decreased systolic and diastolic pressure and their hypotensive effects lasted for longer than one hour.
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Affiliation(s)
- Paula Zaręba
- Department of Physicochemical Drug Analysis, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Kraków, Poland
| | - Magdalena Dudek
- Department of Pharmacodynamics, Jagiellonian University, Collegium Medicum, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Klaudia Lustyk
- Department of Pharmacological Screening, Jagiellonian University, Medical College, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Agata Siwek
- Department of Pharmacobiology, Jagiellonian University, Collegium Medicum, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Gabriela Starowicz
- Department of Pharmacobiology, Jagiellonian University, Collegium Medicum, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Marek Bednarski
- Department of Pharmacological Screening, Jagiellonian University, Medical College, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Leszek Nowiński
- Department of Pharmacodynamics, Jagiellonian University, Collegium Medicum, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Katarzyna Raźny
- Department of Pharmacological Screening, Jagiellonian University, Medical College, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Jacek Sapa
- Department of Pharmacological Screening, Jagiellonian University, Medical College, 9, Medyczna Street, PL 30-688 Kraków, Poland
| | - Barbara Malawska
- Department of Physicochemical Drug Analysis, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Kraków, Poland
| | - Katarzyna Kulig
- Department of Physicochemical Drug Analysis, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Kraków, Poland.
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Wang YL, Li Z, Luo J, Liu ZL. One-pot Synthesis of Tetrahydrobenzo[b]pyrans Catalyzed by PEG-1000 Bridged Primary Amine Functionalized Dicationic Ionic Liquid in Water. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300285] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Ignasik M, Bajda M, Guzior N, Prinz M, Holzgrabe U, Malawska B. Design, synthesis and evaluation of novel 2-(aminoalkyl)-isoindoline-1,3-dione derivatives as dual-binding site acetylcholinesterase inhibitors. Arch Pharm (Weinheim) 2012; 345:509-16. [PMID: 22467516 DOI: 10.1002/ardp.201100423] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 01/23/2012] [Accepted: 02/16/2012] [Indexed: 12/20/2022]
Abstract
A new series of 2-(diethylaminoalkyl)-isoindoline-1,3-dione derivatives intended as dual binding site cholinesterase inhibitors were designed using molecular modeling and evaluated as inhibitors of acetylcholinesterase (AChE), butyrylcholinesterase (BuChE), and the formation of the β-amyloid (Aβ) plaques. For AChE inhibitory activity, the spectrophotometric method of Ellman and the electrophoretically mediated microanalysis assay were used, giving good results. Most of the synthesized compounds had AChE inhibitory activity with IC(50) values ranging from IC(50) = 0.9 to 19.5 µM and weak Aβ anti-aggregation inhibitory activity. These results support the outcome of docking studies which tested compounds targeting both the catalytic active site (CAS) and the peripheral anionic site (PAS) of AChE. The most promising selective AChE inhibitors are compounds 10 (IC(50) = 1.2 µM) and 11 (IC(50) = 1.1 µM), with 6-7 methylene chains, which also inhibit Aβ fibril formation.
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Affiliation(s)
- Michalina Ignasik
- Department of Physicochemical Drug Analysis, Jagiellonian University Medical College, Kraków, Poland
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10
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Kaschula CH, Hunter R, Stellenboom N, Caira MR, Winks S, Ogunleye T, Richards P, Cotton J, Zilbeyaz K, Wang Y, Siyo V, Ngarande E, Parker MI. Structure-activity studies on the anti-proliferation activity of ajoene analogues in WHCO1 oesophageal cancer cells. Eur J Med Chem 2012; 50:236-54. [PMID: 22381354 DOI: 10.1016/j.ejmech.2012.01.058] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 01/20/2012] [Accepted: 01/30/2012] [Indexed: 11/18/2022]
Abstract
The organosulfur compound ajoene derived from the rearrangement of allicin found in crushed garlic can inhibit the proliferation of tumour cells by inducing G(2)/M cell cycle arrest and apoptosis. We report on the application of a concise four-step synthesis (Hunter et al., 2008 [1]) that allows access to ajoene analogues with the end allyl groups substituted. A library of twelve such derivatives tested for their anti-proliferation activity against WHCO1 oesophageal cancer cells has identified a derivative containing p-methoxybenzyl (PMB)-substituted end groups that is twelve times more active than Z-ajoene, with an IC(50) of 2.1μM (Kaschula et al., 2011 [2]). Structure-activity studies involving modification of the sulfoxide and vinyl disulfide groups of this lead have revealed that the disulfide is the ajoene pharmacophore responsible for inhibiting WHCO1 cell growth, inducing G(2)/M cell cycle arrest and apoptosis by caspase-3 activation, and that the vinyl group serves to enhance the anti-proliferation activity a further eightfold. Reaction of the lead with cysteine in refluxing THF as a model reaction for ajoene's mechanism of action based on a thiol/disulfide exchange reveals that the allylic sulfur of the vinyl disulfide is the site of thiol attack in the exchange.
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Affiliation(s)
- Catherine H Kaschula
- Department of Medical Biochemistry, University of Cape Town, Anzio Rd, Observatory, 7925 Cape Town, South Africa
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Jarończyk M, Wołosewicz K, Gabrielsen M, Nowak G, Kufareva I, Mazurek AP, Ravna AW, Abagyan R, Bojarski AJ, Sylte I, Chilmonczyk Z. Synthesis, in vitro binding studies and docking of long-chain arylpiperazine nitroquipazine analogues, as potential serotonin transporter inhibitors. Eur J Med Chem 2012; 49:200-10. [PMID: 22309909 DOI: 10.1016/j.ejmech.2012.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 01/05/2012] [Accepted: 01/06/2012] [Indexed: 11/28/2022]
Abstract
It is well known that 6-nitroquipazine exhibits about 150-fold higher affinity for the serotonin transporter (SERT) than quipazine and recently we showed quipazine buspirone analogues with high to moderate SERT affinity. Now we have designed and synthesized several 6-nitroquipazine buspirone derivatives. Unexpectedly, their SERT binding affinities were moderate, and much lower than that of the previously studied quipazine buspirone analogues. To explain these findings, docking studies of both groups of compounds into two different homology models of human SERT was performed using a flexible target-ligand docking approach (4D docking). The crystal structures of leucine transporter from Aquifex aeolicus in complex with leucine and with tryptophan were used as templates for the SERT models in closed and outward-facing conformations, respectively. We found that the latter conformation represents the most reliable model for binding of buspirone analogues. Docking into that model showed that the nitrated compounds acquire a rod like shape in the binding pocket with polar groups (nitro- and imido-) at the ends of the rod. 6-Nitro substituents gave steric clashes with amino acids located at the extracellular loop 4, which may explain their lower affinity than corresponding quipazine buspirone analogues. The results from the present study may suggest chemical design strategies to improve the SERT modulators.
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Ovat A, Li ZZ, Hampton CY, Asress SA, Fernández FM, Glass JD, Powers JC. Peptidyl alpha-ketoamides with nucleobases, methylpiperazine, and dimethylaminoalkyl substituents as calpain inhibitors. J Med Chem 2010; 53:6326-36. [PMID: 20690647 DOI: 10.1021/jm901221v] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of peptidyl alpha-ketoamides with the general structure Cbz-L-Leu-D,L-AA-CONH-R were synthesized and evaluated as inhibitors for the cysteine proteases calpain I, calpain II, and cathepsin B. Nucleobases, methylpiperazine, and dimethylaminoalkyl groups were incorporated into the primed region of the inhibitors to generate compounds that potentially cross the blood-brain barrier. Two of these compounds (Cbz-Leu-D,L-Abu-CONH-(CH(2))(3)-adenin-9-yl and Cbz-Leu-D,L-Abu-CONH-(CH(2))(3)-(4-methylpiperazin-1-yl) have been shown to have useful concentrations in the brain in animals. The best inhibitor for calpain I was Cbz-Leu-D,L-Abu-CONH-(CH(2))(3)-2-methoxyadenin-9-yl (K(i) = 23 nM), and the best inhibitor for calpain II was Cbz-Leu-D,L-Phe-CONH-(CH(2))(3)-adenin-9-yl (K(i) = 68 nM). On the basis of the crystal structure obtained with heterocyclic peptidyl alpha-ketoamides, we have improved inhibitor potency by introducing a small hydrophobic group on the adenine ring. These inhibitors have good potential to be used in the treatment of neurodegenerative diseases.
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Affiliation(s)
- Asli Ovat
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, Georgia 30332, USA
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Regioselective synthesis of azetidines or pyrrolidines by selenium-induced cyclization of secondary homoallylic amines. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.06.087] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Liu SW, Hsu HC, Chang CH, Tsai HHG, Hou DR. Asymmetric Synthesis of (-)-Lentiginosine by Double Aza-Michael Reaction. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000691] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2004. Coord Chem Rev 2006. [DOI: 10.1016/j.ccr.2005.10.020] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Short enantioselective synthesis of sedridines, ethylnorlobelols and coniine via reagent-based differentiation. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.05.032] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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