1
|
Stindt CN, Crespi S, Feringa BL. Synthesis of Styrylbenzazole Photoswitches and Evaluation of their Photochemical Properties. Chemistry 2024; 30:e202401409. [PMID: 38761405 DOI: 10.1002/chem.202401409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 05/08/2024] [Accepted: 05/10/2024] [Indexed: 05/20/2024]
Abstract
Styrylbenzazoles form a promising yet under-represented class of photoswitches that can perform a light-driven E-Z isomerization of the central alkene double bond without undergoing irreversible photocyclization, typical of the parent stilbene. In this work, we report the synthesis and photochemical study of 23 styrylbenzazole photoswitches. Their thermal stabilities, quantum yields, maximum absorption wavelengths and photostationary state (PSS) distributions can be tuned by changing the benzazole heterocycle and the substitution pattern on the aryl ring. In particular, we found that push-pull systems show large redshifts of the maximum absorption wavelengths and the highest quantum yields, whereas ortho-substituted styrylbenzazole photoswitches exhibit the most favorable PSS ratios. Taking advantage of both design principles, we produced 2,6-dimethyl-4-(dimethylamino)-styrylbenzothiazole, a thermally stable and efficient P-type photoswitch which displays negative photochromism upon irradiation with visible light up to 470 nm to obtain a near-quantitative isomerization with a very high quantum yield of 59 %. Furthermore, 4-hydroxystyrylbenzoxazole was demonstrated to be a pH-sensitive switch which exhibits a 100 nm redshift upon deprotonation. Ortho-methylation of its benzothiazole analogue improved the obtained PSS ratio in its deprotonated state from E : Z=53 : 47 to E : Z=18 : 82. We anticipate that this relatively unexplored class of photoswitches will form a valuable expansion of the current family of photoswitches.
Collapse
Affiliation(s)
- Charlotte N Stindt
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Stefano Crespi
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
- Present address: Ångström Laboratory, Department of Chemistry, Uppsala University, Box 523, 751 20, Uppsala, Sweden
| | - Ben L Feringa
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| |
Collapse
|
2
|
Chisholm TS, Hunter CA. A closer look at amyloid ligands, and what they tell us about protein aggregates. Chem Soc Rev 2024; 53:1354-1374. [PMID: 38116736 DOI: 10.1039/d3cs00518f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The accumulation of amyloid fibrils is characteristic of neurodegenerative diseases such as Alzheimer's disease (AD) and Parkinson's disease. Detecting these fibrils with fluorescent or radiolabelled ligands is one strategy for diagnosing and better understanding these diseases. A vast number of amyloid-binding ligands have been reported in the literature as a result. To obtain a better understanding of how amyloid ligands bind, we have compiled a database of 3457 experimental dissociation constants for 2076 unique amyloid-binding ligands. These ligands target Aβ, tau, or αSyn fibrils, as well as relevant biological samples including AD brain homogenates. From this database significant variation in the reported dissociation constants of ligands was found, possibly due to differences in the morphology of the fibrils being studied. Ligands were also found to bind to Aβ(1-40) and Aβ(1-42) fibrils with similar affinities, whereas a greater difference was found for binding to Aβ and tau or αSyn fibrils. Next, the binding of ligands to fibrils was shown to be largely limited by the hydrophobic effect. Some Aβ ligands do not fit into this hydrophobicity-limited model, suggesting that polar interactions can play an important role when binding to this target. Finally several binding site models were outlined for amyloid fibrils that describe what ligands target what binding sites. These models provide a foundation for interpreting and designing site-specific binding assays.
Collapse
Affiliation(s)
- Timothy S Chisholm
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1 EW, UK.
| | - Christopher A Hunter
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1 EW, UK.
| |
Collapse
|
3
|
da Silva CB, Silva L, Debia NP, Chaves OA, Lüdtke DS, Rodembusch FS. Photoactive glycoconjugates with a very large Stokes shift: synthesis, photophysics, and copper(II) and BSA sensing. Org Biomol Chem 2023; 21:9242-9254. [PMID: 37966045 DOI: 10.1039/d3ob01388j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
This study presents the synthesis of novel glycoconjugates by connecting benzazole and carbohydrate units with a 1,2,3-triazole linker. A simple synthetic route employing a copper(I) catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) was utilized. The synthesized compounds exhibit excited-state intramolecular proton transfer (ESIPT), resulting in longer wavelength emission with a significantly large Stokes shift (∼10 000 cm-1). These compounds show potential as chemical sensors due to their ability to detect Cu2+ ions, causing a decrease in fluorescence emission (turn-off effect). Additionally, they demonstrate strong interaction with proteins, exemplified by their interaction with bovine serum albumin (BSA) as a model protein.
Collapse
Affiliation(s)
- Cláudia Brito da Silva
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada. Instituto de Química (UFRGS), Av. Bento Gonçalves, 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
| | - Luana Silva
- Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil.
| | - Natalí Pires Debia
- Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil.
| | - Otávio Augusto Chaves
- CQC-IMS, Departamento de Química, Universidade de Coimbra, Rua Larga, 3004-535 Coimbra, Portugal
- Laboratório de Imunofarmacologia, Centro de Pesquisa, Inovação e Vigilância em COVID-19 e Emergências Sanitárias (CPIV), Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (Fiocruz), Av. Brasil 4036 - Bloco 2, 21040-361 Rio de Janeiro - RJ, Brazil
| | - Diogo Seibert Lüdtke
- Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil.
| | - Fabiano Severo Rodembusch
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada. Instituto de Química (UFRGS), Av. Bento Gonçalves, 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
| |
Collapse
|
4
|
Benzothiazoles from Condensation of o-Aminothiophenoles with Carboxylic Acids and Their Derivatives: A Review. Molecules 2021; 26:molecules26216518. [PMID: 34770926 PMCID: PMC8587170 DOI: 10.3390/molecules26216518] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/14/2021] [Accepted: 10/21/2021] [Indexed: 01/27/2023] Open
Abstract
Nowadays, organic chemists are interested in the field of heterocyclic chemistry due to its use in the synthesis of a great variety of biologically active compounds. Heterocyclic compounds are widely found in nature and are essential for life. Among these, some natural nitrogen containing heterocyclic compounds have been used as chemotherapeutic agents. Their attachment to sugar molecules either as thioglycosides or as nucleosides analogues plays an important role in vital biological processes as well as in synthetic organic chemistry. Molecules containing benzothiazole (BT) nuclei are of this interesting class of compounds because some of them have been found to have a wide variety of biological activities. In this sense, we selected this topic to review and to then summarize the procedures related to the condensation reactions of o-aminothiophenoles (ATPs) as well as their disulfides with carboxylic acids, esters, orthoesters, acyl chlorides, amides, and nitriles. The condensation reactions with carbon dioxide (CO2) are included. Conventional methods with the use of acid and metal catalysts as well as recent green techniques, such as microwave irradiation, the use of ionic liquids, and ultrasound (US) chemistry, which have proven to have many advantages, were found in the review.
Collapse
|
5
|
Alpha-Synuclein PET Tracer Development-An Overview about Current Efforts. Pharmaceuticals (Basel) 2021; 14:ph14090847. [PMID: 34577548 PMCID: PMC8466155 DOI: 10.3390/ph14090847] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/16/2021] [Accepted: 08/17/2021] [Indexed: 12/18/2022] Open
Abstract
Neurodegenerative diseases such as Parkinson’s disease (PD) are manifested by inclusion bodies of alpha-synuclein (α-syn) also called α-synucleinopathies. Detection of these inclusions is thus far only possible by histological examination of postmortem brain tissue. The possibility of non-invasively detecting α-syn will therefore provide valuable insights into the disease progression of α-synucleinopathies. In particular, α-syn imaging can quantify changes in monomeric, oligomeric, and fibrillic α-syn over time and improve early diagnosis of various α-synucleinopathies or monitor treatment progress. Positron emission tomography (PET) is a non-invasive in vivo imaging technique that can quantify target expression and drug occupancies when a suitable tracer exists. As such, novel α-syn PET tracers are highly sought after. The development of an α-syn PET tracer faces several challenges. For example, the low abundance of α-syn within the brain necessitates the development of a high-affinity ligand. Moreover, α-syn depositions are, in contrast to amyloid proteins, predominantly localized intracellularly, limiting their accessibility. Furthermore, another challenge is the ligand selectivity over structurally similar amyloids such as amyloid-beta or tau, which are often co-localized with α-syn pathology. The lack of a defined crystal structure of α-syn has also hindered rational drug and tracer design efforts. Our objective for this review is to provide a comprehensive overview of current efforts in the development of selective α-syn PET tracers.
Collapse
|
6
|
Debia NP, Rodríguez JJ, da Silveira CH, Chaves OA, Iglesias BA, Rodembusch FS, Lüdtke DS. Synthesis and photophysics of benzazole based triazoles with amino acid-derived pendant units. Multiparametric optical sensors for BSA and CT-DNA in solution. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113092] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
7
|
|
8
|
Liu H, Chen L, Zhou F, Zhang YX, Xu J, Xu M, Bai SP. Anti-oligomerization sheet molecules: Design, synthesis and evaluation of inhibitory activities against α-synuclein aggregation. Bioorg Med Chem 2019; 27:3089-3096. [PMID: 31196755 DOI: 10.1016/j.bmc.2019.05.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 05/20/2019] [Indexed: 12/20/2022]
Abstract
Aggregation of α-synuclein (α-Syn) play a key role in the development of Parkinson Disease (PD). One of the effective approaches is to stabilize the native, monomeric protein with suitable molecule ligands. We have designed and synthesized a series of sheet-like conjugated compounds which possess different skeletons and various heteroatoms in the two blocks located at both ends of linker, which have good π-electron delocalization and high ability of hydrogen-bond formation. They have shown anti-aggregation activities in vitro towards α-Syn with IC50 down to 1.09 μM. The molecule is found binding in parallel to the NACore within NAC domain of α-Syn, interfering aggregation of NAC region within different α-Syn monomer, and further inhibiting or slowing down the formation of α-Syn oligomer nuclei at lag phase. The potential inhibitor obtained by our strategy is considered to be highly efficient to inhibit α-Syn aggregation.
Collapse
Affiliation(s)
- Hao Liu
- College of Chemistry and Molecular Engineering, Zhengzhou University, Daxue Road 75, 450052 Zhengzhou, China
| | - Li Chen
- College of Chemistry and Molecular Engineering, Zhengzhou University, Daxue Road 75, 450052 Zhengzhou, China
| | - Fei Zhou
- College of Chemistry and Molecular Engineering, Zhengzhou University, Daxue Road 75, 450052 Zhengzhou, China
| | - Yun-Xiao Zhang
- College of Chemistry and Molecular Engineering, Zhengzhou University, Daxue Road 75, 450052 Zhengzhou, China.
| | - Ji Xu
- School of Basic Medical Science, Neuroscience Research Institute, Academy of Medical Sciences, Zhengzhou University, Kexue Road 100, 450001 Zhengzhou, China.
| | - Meng Xu
- Department of Information of the First Affiliated Hospital, Zhengzhou University, Jianshe Road 1, 450052 Zhengzhou, China
| | - Su-Ping Bai
- College of Pharmacy, Xinxiang Medical University, Jinsui Road 601, 453003 Xinxiang, China.
| |
Collapse
|
9
|
Luo B, Li D, Zhang AL, Gao JM. Synthesis, Antifungal Activities and Molecular Docking Studies of Benzoxazole and Benzothiazole Derivatives. Molecules 2018; 23:molecules23102457. [PMID: 30257495 PMCID: PMC6222379 DOI: 10.3390/molecules23102457] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 09/14/2018] [Accepted: 09/19/2018] [Indexed: 11/16/2022] Open
Abstract
Based on benzoxazole and benzothiazole scaffold as an important pharmacophore, two series of 2-(aryloxymethyl) benzoxazole and benzothiazole derivatives were synthesized and their antifungal effects against eight phytopathogenic fungi were evaluated. Compounds 5a, 5b, 5h, and 5i exhibited significant antifungal activities against most of the pathogens tested. Especially 5a, 5b, 5h, 5i, 5j, and 6h inhibited the growth of F. solani with IC50 of 4.34⁻17.61 μg/mL, which were stronger than that of the positive control, hymexazol (IC50 of 38.92 μg/mL). 5h was the most potent inhibitor (IC50 of 4.34 μg/mL) against F. Solani, which was about nine times more potent than hymexazol. Most of the test compounds displayed significant antifungal effects against B. cinerea (IC50 of 19.92⁻77.41 μg/mL), among them, 5a was the best one (IC50 of 19.92 μg/mL). The structure-activity relationships (SARs) were compared and analyzed. The result indicates that the electron-drawing ability and position of the substituents have a significant impact on biological activities. Furthermore, docking studies were carried out on the lipid transfer protein sec14p from S. cerevisiae, and preliminarily verified the antifungal activities. Taken together, these results provide 2-(phenoxymethyl)benzo[d]oxazole as an encouraging framework that could lead to the development of potent novel antifungal agents.
Collapse
Affiliation(s)
- Bo Luo
- College of Life Sciences, Xinyang Normal University, Tea Plant Biology Key Laboratory of Henan Province, Xinyang 464000, China.
- Shaanxi Key Labotory of Natural Products & Chemical Biology, Shaanxi Engineering Center of Bioresource Chemistry & Sustainable Utilization, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - Ding Li
- Shaanxi Key Labotory of Natural Products & Chemical Biology, Shaanxi Engineering Center of Bioresource Chemistry & Sustainable Utilization, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - An-Ling Zhang
- Shaanxi Key Labotory of Natural Products & Chemical Biology, Shaanxi Engineering Center of Bioresource Chemistry & Sustainable Utilization, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - Jin-Ming Gao
- Shaanxi Key Labotory of Natural Products & Chemical Biology, Shaanxi Engineering Center of Bioresource Chemistry & Sustainable Utilization, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| |
Collapse
|
10
|
Verdurand M, Levigoureux E, Zeinyeh W, Berthier L, Mendjel-Herda M, Cadarossanesaib F, Bouillot C, Iecker T, Terreux R, Lancelot S, Chauveau F, Billard T, Zimmer L. In Silico, in Vitro, and in Vivo Evaluation of New Candidates for α-Synuclein PET Imaging. Mol Pharm 2018; 15:3153-3166. [DOI: 10.1021/acs.molpharmaceut.8b00229] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Mathieu Verdurand
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
| | - Elise Levigoureux
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
- Hospices Civils de Lyon, Lyon 69361, France
| | - Wael Zeinyeh
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
| | - Laurent Berthier
- Université de Lyon, Université Claude Bernard Lyon 1, Institute of Biology and Chemistry of Proteins, CNRS UMR5305, Lyon 69361, France
| | - Meriem Mendjel-Herda
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
| | | | | | | | - Raphaël Terreux
- Université de Lyon, Université Claude Bernard Lyon 1, Institute of Biology and Chemistry of Proteins, CNRS UMR5305, Lyon 69361, France
| | - Sophie Lancelot
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
- Hospices Civils de Lyon, Lyon 69361, France
| | - Fabien Chauveau
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
| | - Thierry Billard
- CERMEP-Imaging Platform, Bron 69677, France
- Université de Lyon, Université Claude Bernard Lyon 1, Institute of Chemistry and Biochemistry, CNRS UMR5246, Villeurbanne 69100, France
| | - Luc Zimmer
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon 69361, France
- Hospices Civils de Lyon, Lyon 69361, France
- CERMEP-Imaging Platform, Bron 69677, France
| |
Collapse
|
11
|
Watanabe H, Ariyoshi T, Ozaki A, Ihara M, Ono M, Saji H. Synthesis and biological evaluation of novel radioiodinated benzimidazole derivatives for imaging α-synuclein aggregates. Bioorg Med Chem 2017; 25:6398-6403. [DOI: 10.1016/j.bmc.2017.10.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 10/10/2017] [Accepted: 10/13/2017] [Indexed: 12/20/2022]
|
12
|
Watanabe H, Ono M, Ariyoshi T, Katayanagi R, Saji H. Novel Benzothiazole Derivatives as Fluorescent Probes for Detection of β-Amyloid and α-Synuclein Aggregates. ACS Chem Neurosci 2017; 8:1656-1662. [PMID: 28467708 DOI: 10.1021/acschemneuro.6b00450] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Deposits of β-amyloid (Aβ) and α-synuclein (α-syn) are the hallmark of Alzheimer's disease (AD) and Parkinson's disease (PD), respectively. The detection of these protein aggregates with fluorescent probes is particularly of interest for preclinical studies using fluorescence microscopy on human brain tissue. In this study, we newly designed and synthesized three push-pull benzothiazole (PP-BTA) derivatives as fluorescent probes for detection of Aβ and α-syn aggregates. Fluorescence intensity of all PP-BTA derivatives significantly increased upon binding to Aβ(1-42) and α-syn aggregates in solution. In in vitro saturation binding assays, PP-BTA derivatives demonstrated affinity for both Aβ(1-42) (Kd = 40-148 nM) and α-syn (Kd = 48-353 nM) aggregates. In particular, PP-BTA-4 clearly stained senile plaques composed of Aβ aggregates in the AD brain section. Moreover, it also labeled Lewy bodies composed of α-syn aggregates in the PD brain section. These results suggest that PP-BTA-4 may serve as a promising fluorescent probe for the detection of Aβ and α-syn aggregates.
Collapse
Affiliation(s)
- Hiroyuki Watanabe
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masahiro Ono
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Taisuke Ariyoshi
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Rikako Katayanagi
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideo Saji
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| |
Collapse
|
13
|
Patil PC, Luzzio FA. Synthesis of extended oxazoles II: Reaction manifold of 2-(halomethyl)-4,5-diaryloxazoles. Tetrahedron Lett 2016; 57:757-759. [PMID: 26989270 PMCID: PMC4790446 DOI: 10.1016/j.tetlet.2016.01.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
2-(Halomethyl)-4,5-diphenyloxazoles are effective, reactive scaffolds which can be utilized for synthetic elaboration at the 2-position. Through substitution reactions, the chloromethyl analogue is used to prepare a number of 2-alkylamino-, 2-alkylthio- and 2-alkoxy-(methyl) oxazoles. The 2-bromomethyl analogue offers a more reactive alternative to the chloromethyl compounds and is useful in the C-alkylation of a stabilized (malonate) carbanion as exemplified by a concise synthesis of Oxaprozin.
Collapse
Affiliation(s)
- Pravin C. Patil
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky, 40292 USA
| | - Frederick A. Luzzio
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky, 40292 USA
| |
Collapse
|
14
|
Morais GR, Palma E, Marques F, Gano L, Oliveira MC, Abrunhosa A, Miranda HV, Outeiro TF, Santos I, Paulo A. Synthesis and Biological Evaluation of Novel 2-Aryl Benzimidazoles as Chemotherapeutic Agents. J Heterocycl Chem 2015. [DOI: 10.1002/jhet.2575] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Goreti Ribeiro Morais
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
| | - Elisa Palma
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
- Centro de Química Estrutural, Instituto Superior Técnico; Universidade de Lisboa; Avenida Rovisco Pais 1 1049-001 Lisboa Portugal
| | - Fernanda Marques
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
| | - Lurdes Gano
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
| | - Maria Cristina Oliveira
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
| | - Antero Abrunhosa
- ICNAS, Instituto de Ciências Nucleares Aplicadas à Saúde; Universidade Coimbra; Coimbra Portugal
| | - Hugo Vicente Miranda
- Instituto de Medicina Molecular; Lisboa Portugal
- CEDOC, Faculdade de Ciências Médicas; Universidade Nova de Lisboa; Lisboa Portugal
| | - Tiago F. Outeiro
- Instituto de Medicina Molecular; Lisboa Portugal
- CEDOC, Faculdade de Ciências Médicas; Universidade Nova de Lisboa; Lisboa Portugal
- Instituto de Fisiologia; Faculdade de Medicina da Universidade de Lisboa; Lisboa Portugal
- Department of Neurodegeneration and Restorative Research; University Medical Center Göttingen; Göttingen Germany
| | - Isabel Santos
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
| | - Antonio Paulo
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico; Universidade de Lisboa; Bobadela Portugal
| |
Collapse
|
15
|
Abstract
BACKGROUND Dementia with Lewy body (DLB) is considered to be the second most common form of neurodegenerative disorders after Alzheimer's disease (AD), affecting as many as 100,000 people in the UK and up to 1.3 million in the USA. However, nearly half of patients with DLB remain undiagnosed thus depriving many of them from an early and adequate treatment of their distressing symptoms. Accurate and early diagnosis of DLB is important for both patients and their caregivers, since the neuropsychiatric symptoms require specific management. METHODS In the current study, we review the most recent developments in the field of molecular nuclear imaging to diagnose DLB. RESULTS The review addresses, the neurotransmitter based (dopaminergic, cholinergic, and glutamatergic) nuclear imaging techniques, role of the autonomic dysfunction and its visualization in DLB with myocardial sympathetic imaging and vesicular catecholamine uptake, as well as the use of amyloid polypeptides and glial markers as molecular imaging probes in the clinical diagnosis of DLB. CONCLUSIONS Most of the above nuclear imaging methods are restricted to highly specialized clinical centers, and thus not applicable to a large number of patients requiring dementia (e.g. DLB) diagnosis in routine clinical setting. Validating them against more readily accessible peripheral biomarkers, e.g. CSF and blood biomarkers linked to the DLB process, may facilitate their use in wider clinical settings.
Collapse
|
16
|
Macedo D, Tavares L, McDougall GJ, Vicente Miranda H, Stewart D, Ferreira RB, Tenreiro S, Outeiro TF, Santos CN. (Poly)phenols protect from α-synuclein toxicity by reducing oxidative stress and promoting autophagy. Hum Mol Genet 2014; 24:1717-32. [DOI: 10.1093/hmg/ddu585] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
|
17
|
Fluorescence Investigation of Interactions Between Novel Benzanthrone Dyes and Lysozyme Amyloid Fibrils. J Fluoresc 2013; 24:493-504. [DOI: 10.1007/s10895-013-1318-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 11/07/2013] [Indexed: 10/25/2022]
|
18
|
Ribeiro Morais G, Gano L, Kniess T, Bergmann R, Abrunhosa A, Santos I, Paulo A. Radiosynthesis and in vivo evaluation of a ¹⁸F-labelled styryl-benzoxazole derivative for β-amyloid targeting. Appl Radiat Isot 2013; 82:100-4. [PMID: 23974304 DOI: 10.1016/j.apradiso.2013.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 04/15/2013] [Accepted: 07/01/2013] [Indexed: 11/28/2022]
Abstract
The formation of β-amyloid deposits is considered a histopathological feature of Alzheimer's disease (AD). In vivo molecular imaging by means of amyloid-avid radiotracers will allow for an early and conclusive diagnostic of AD. Herein, we describe the radiosynthesis of the radiofluorinated styryl benzoxazole derivative [¹⁸F]-[2-[N-methyl-N-(2'-fluoroethyl)-4'-aminostyryl]benzoxazole] ([¹⁸F]-1) and its pre-clinical evaluation, including metabolic and biodistribution studies in male Wistar rats. The in vivo biological evaluation of [¹⁸F]-1 showed that this new radiotracer has a moderate brain uptake with a slow brain washout and a poor in vivo stability.
Collapse
Affiliation(s)
- G Ribeiro Morais
- Radiopharmaceutical Sciences Group, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, EN 10, 2686-953 Sacavem, Portugal
| | | | | | | | | | | | | |
Collapse
|
19
|
Hayashi K, Tachibana A, Tazawa S, Mizukawa Y, Osaki K, Morimoto Y, Zochi R, Kurahashi M, Aki H, Takahashi K. Preparation and stability of ethanol-free solution of [18F]florbetapir ([18F]AV-45) for positron emission tomography amyloid imaging. J Labelled Comp Radiopharm 2013; 56:295-300. [DOI: 10.1002/jlcr.3021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 11/01/2012] [Accepted: 12/17/2012] [Indexed: 11/10/2022]
Affiliation(s)
| | - Akiko Tachibana
- Molecular Imaging Integration Unit; RIKEN Center for Molecular Imaging Science (CMIS); 6-7-3 Minatojima Minami-machi, Chuo-ku; Kobe-city; Hyogo; 650-0047; Japan
| | - Shusaku Tazawa
- Molecular Imaging Integration Unit; RIKEN Center for Molecular Imaging Science (CMIS); 6-7-3 Minatojima Minami-machi, Chuo-ku; Kobe-city; Hyogo; 650-0047; Japan
| | - Yosuke Mizukawa
- JFE Technos Co., Ltd; 2-1 Suehiro-cho, Tsurumi-ku; Yokohama-city; Kanagawa; 230-0045; Japan
| | - Katsuhiko Osaki
- JFE Technos Co., Ltd; 2-1 Suehiro-cho, Tsurumi-ku; Yokohama-city; Kanagawa; 230-0045; Japan
| | - Yoko Morimoto
- Molecular Imaging Integration Unit; RIKEN Center for Molecular Imaging Science (CMIS); 6-7-3 Minatojima Minami-machi, Chuo-ku; Kobe-city; Hyogo; 650-0047; Japan
| | - Riyo Zochi
- Molecular Imaging Integration Unit; RIKEN Center for Molecular Imaging Science (CMIS); 6-7-3 Minatojima Minami-machi, Chuo-ku; Kobe-city; Hyogo; 650-0047; Japan
| | - Masahiro Kurahashi
- Molecular Imaging Labeling Chemistry Laboratory; RIKEN Center for Molecular Imaging Science (CMIS); 6-7-3 Minatojima Minamimachi, Chuo-ku; Kobe-city; Hyogo; 650-0047; Japan
| | - Hatsumi Aki
- Department of Pharmaceuticals, Faculty of Pharmaceutical Sciences; Fukuoka University; 8-19-1 Nanakuma, Jonan-ku; Fukuoka-city; Fukuoka; 814-80; Japan
| | - Kazuhiro Takahashi
- Molecular Imaging Integration Unit; RIKEN Center for Molecular Imaging Science (CMIS); 6-7-3 Minatojima Minami-machi, Chuo-ku; Kobe-city; Hyogo; 650-0047; Japan
| |
Collapse
|
20
|
Extracellular alpha-synuclein oligomers modulate synaptic transmission and impair LTP via NMDA-receptor activation. J Neurosci 2012; 32:11750-62. [PMID: 22915117 DOI: 10.1523/jneurosci.0234-12.2012] [Citation(s) in RCA: 205] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Parkinson's disease (PD) is the most common representative of a group of disorders known as synucleinopathies, in which misfolding and aggregation of α-synuclein (a-syn) in various brain regions is the major pathological hallmark. Indeed, the motor symptoms in PD are caused by a heterogeneous degeneration of brain neurons not only in substantia nigra pars compacta but also in other extrastriatal areas of the brain. In addition to the well known motor dysfunction in PD patients, cognitive deficits and memory impairment are also an important part of the disorder, probably due to disruption of synaptic transmission and plasticity in extrastriatal areas, including the hippocampus. Here, we investigated the impact of a-syn aggregation on AMPA and NMDA receptor-mediated rat hippocampal (CA3-CA1) synaptic transmission and long-term potentiation (LTP), the neurophysiological basis for learning and memory. Our data show that prolonged exposure to a-syn oligomers, but not monomers or fibrils, increases basal synaptic transmission through NMDA receptor activation, triggering enhanced contribution of calcium-permeable AMPA receptors. Slices treated with a-syn oligomers were unable to respond with further potentiation to theta-burst stimulation, leading to impaired LTP. Prior delivery of a low-frequency train reinstated the ability to express LTP, implying that exposure to a-syn oligomers drives the increase of glutamatergic synaptic transmission, preventing further potentiation by physiological stimuli. Our novel findings provide mechanistic insight on how a-syn oligomers may trigger neuronal dysfunction and toxicity in PD and other synucleinopathies.
Collapse
|
21
|
Design, synthesis, and evaluation of resveratrol derivatives as Aß(₁-₄₂) aggregation inhibitors, antioxidants, and neuroprotective agents. Bioorg Med Chem Lett 2012; 22:7683-7. [PMID: 23127891 DOI: 10.1016/j.bmcl.2012.09.105] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 09/06/2012] [Accepted: 09/28/2012] [Indexed: 10/27/2022]
Abstract
A series of novel resveratrol derivatives were designed, synthesised and evaluated as potential therapeutic agents for the treatment of Alzheimer's disease. Among these compounds, compound 7l, (E)-5-(4-(isopropylamino)styryl)benzene-1,3-diol, exhibited potent ß-amyloid aggregation inhibition activity, which was confirmed by a ThT fluorescence assay (71.65% at 20 μM) and transmission electron microscopy (TEM). Compound 7l also exhibited good antioxidant activity (4.12 Trolox equivalents in an oxygen radical absorbance capacity assay and a 37% reduction in reactive oxygen species in cells at 10 μM). The cytotoxicity analysis of compounds 7f, 7i, 7j and 7l indicated that these compounds have lower toxicities than resveratrol at 60 μM.
Collapse
|
22
|
Ribeiro Morais G, Paulo A, Santos I. A Synthetic Overview of Radiolabeled Compounds for β‐Amyloid Targeting. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101449] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Goreti Ribeiro Morais
- Group of Radiopharmaceutical Sciences, Institute Tecnologic and Nuclear, Estrada Nacional 10, 2686‐953 Sacavém, Portugal
| | - António Paulo
- Group of Radiopharmaceutical Sciences, Institute Tecnologic and Nuclear, Estrada Nacional 10, 2686‐953 Sacavém, Portugal
| | - Isabel Santos
- Group of Radiopharmaceutical Sciences, Institute Tecnologic and Nuclear, Estrada Nacional 10, 2686‐953 Sacavém, Portugal
| |
Collapse
|