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Sari S, Önder S, Akkaya D, Sabuncuoğlu S, Zengin M, Barut B, Karakurt A. Azole derivatives inhibit wildtype butyrylcholinesterase and its common mutants. Drug Dev Res 2023; 84:1018-1028. [PMID: 37154110 DOI: 10.1002/ddr.22071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 04/20/2023] [Accepted: 04/22/2023] [Indexed: 05/10/2023]
Abstract
Azoles, which have been used for antifungal chemotherapy for decades, have recently been of interest for their efficacy against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE). There is little known about the potential of azoles against BChE, however there is none regarding their inhibitory effects against mutants of BChE. In the current study, an azole library of 1-aryl-2-(1H-imidazol-1-yl)ethanol/ethanone oxime esters were tested against AChE and BChE, which yielded derivates more potent than the positive control, galantamine, against both isoforms. Kinetic analyses were performed for wildtype and mutant (A328F and A328Y) inhibition for the two most potent BChE inhibitors, pivalic and 3-bezoylpropanoic acid esters of 2-(1H-imidazol-1-yl)-1-(2-naphthyl)ethanol, which were found to have great affinity to the wildtype and mutant BChE types with Ki values as low as 0.173 ± 0.012 µM. The compounds were identified to show linear competitive or mixed type inhibition. Molecular modeling confirmed these kinetic data and provided further insights regarding molecular basis of BChE inhibition by the active derivatives. Thus, current study suggests new azole derivatives with promising cholinesterase inhibitory effects and reveals the first set of information to promote our understanding for the inhibitory behavior of this class against the mutant BChE forms.
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Affiliation(s)
- Suat Sari
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Seda Önder
- Department of Biochemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Didem Akkaya
- Department of Biochemistry, Faculty of Pharmacy, Karadeniz Technical University, Trabzon, Turkey
| | - Suna Sabuncuoğlu
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Merve Zengin
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Burak Barut
- Department of Biochemistry, Faculty of Pharmacy, Karadeniz Technical University, Trabzon, Turkey
| | - Arzu Karakurt
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inönü University, Malatya, Turkey
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Boukharsa Y, Karrouchi K, Anouar EH, Albalwi H, Jarbi I, Ramli Y, Faouzi MEA, Ansar M. Synthesis, α-Glucosidase and β-Galactosidase Inhibitory Potentials and Molecular Docking of Some Novel Benzofuran-Pyridazine Derivatives. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2149561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Youness Boukharsa
- Laboratory of Medicinal Chemistry, Faculty of Medicine and Pharmacy, Mohammed V University of Rabat, Rabat, Morocco
| | - Khalid Karrouchi
- Laboratory of Analytical Chemistry and Bromatology, Team of Formulation and Quality Control of Health Products, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - El Hassane Anouar
- Department of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Hanan Albalwi
- Department of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Ibtissam Jarbi
- Laboratory of Pharmacology and Toxicology, Biopharmaceutical and Toxicological Analysis Research Team, Faculty of Medicine and Pharmacy, Mohammed V University of Rabat, Rabat, Morocco
| | - Youssef Ramli
- Laboratory of Medicinal Chemistry, Faculty of Medicine and Pharmacy, Mohammed V University of Rabat, Rabat, Morocco
| | - My El Abbes Faouzi
- Laboratory of Pharmacology and Toxicology, Biopharmaceutical and Toxicological Analysis Research Team, Faculty of Medicine and Pharmacy, Mohammed V University of Rabat, Rabat, Morocco
| | - M’hammed Ansar
- Laboratory of Medicinal Chemistry, Faculty of Medicine and Pharmacy, Mohammed V University of Rabat, Rabat, Morocco
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Merde İB, Önel GT, Türkmenoğlu B, Gürsoy Ş, Dilek E, Özçelik AB, Uysal M. Synthesis of (
p‐
tolyl)‐3(2
H
)pyridazinone Derivatives as Novel Acetylcholinesterase Inhibitors. ChemistrySelect 2022. [DOI: 10.1002/slct.202201606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- İrem Bozbey Merde
- Department of Pharmaceutical Chemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Yalnızbağ 24002 Erzincan Turkey
| | - Gülce Taşkor Önel
- Department of Analytical Chemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Yalnızbağ 24002 Erzincan Turkey
| | - Burçin Türkmenoğlu
- Department of Analytical Chemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Yalnızbağ 24002 Erzincan Turkey
| | - Şule Gürsoy
- Department of Biochemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Yalnızbağ 24002 Erzincan Turkey
| | - Esra Dilek
- Department of Biochemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Yalnızbağ 24002 Erzincan Turkey
| | - Azime Berna Özçelik
- Department of Pharmaceutical Chemistry Faculty of Pharmacy Gazi University 06330 Ankara Turkey
| | - Mehtap Uysal
- Department of Pharmaceutical Chemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Yalnızbağ 24002 Erzincan Turkey
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Alagöz MA, Oh JM, Zenni YN, Özdemir Z, Abdelgawad MA, Naguib IA, Ghoneim MM, Gambacorta N, Nicolotti O, Kim H, Mathew B. Development of a Novel Class of Pyridazinone Derivatives as Selective MAO-B Inhibitors. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27123801. [PMID: 35744926 PMCID: PMC9230784 DOI: 10.3390/molecules27123801] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 06/01/2022] [Accepted: 06/08/2022] [Indexed: 01/15/2023]
Abstract
Sixteen compounds (TR1-TR16) were synthesized and evaluated for their inhibitory activities against monoamine oxidase A and B (MAOs). Most of the derivatives showed potent and highly selective MAO-B inhibition. Compound TR16 was the most potent inhibitor against MAO-B with an IC50 value of 0.17 μM, followed by TR2 (IC50 = 0.27 μM). TR2 and TR16 selectivity index (SI) values for MAO-B versus MAO-A were 84.96 and higher than 235.29, respectively. Compared to the basic structures, the para-chloro substituent in TR2 and TR16 increased the inhibitory activity of MAO-B. TR2 and TR16 were reversible MAO-B inhibitors that were competitive, with Ki values of 0.230 ± 0.004 and 0.149 ± 0.016 µM, respectively. The PAMPA method indicated that compounds TR2 and TR16 had the tendency to traverse the blood-brain barrier. Docking investigations revealed that lead compounds were beneficial for MAO-B inhibition via association with key as well as selective E84 or Y326 residues, but not for MAO-A inhibition via interaction primarily driven by hydrophobic contacts. In conclusion, TR2 and TR16 are therapeutic prospects for the management of multiple neurodegenerative diseases.
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Affiliation(s)
- Mehmet Abdullah Alagöz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, 44280 Malatya, Turkey; (M.A.A.); (Y.N.Z.); (Z.Ö.)
| | - Jong Min Oh
- Department of Pharmacy, and Research Institute of Life Pharmaceutical Sciences, Sunchon National University, Suncheon 57922, Korea;
| | - Yaren Nur Zenni
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, 44280 Malatya, Turkey; (M.A.A.); (Y.N.Z.); (Z.Ö.)
| | - Zeynep Özdemir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, 44280 Malatya, Turkey; (M.A.A.); (Y.N.Z.); (Z.Ö.)
| | - Mohamed A. Abdelgawad
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jouf University, Sakaka, Al Jouf 72341, Saudi Arabia;
| | - Ibrahim A. Naguib
- Department of Pharmaceutical Chemistry, College of Pharmacy, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
| | - Mohammed M. Ghoneim
- Department of Pharmacy Practice, Faculty of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia;
| | - Nicola Gambacorta
- Dipartimento di Farmacia—Scienze del Farmaco, Università degli Studi di Bari “Aldo Moro”, Via E. Orabona, 4, 70125 Bari, Italy; (N.G.); (O.N.)
| | - Orazio Nicolotti
- Dipartimento di Farmacia—Scienze del Farmaco, Università degli Studi di Bari “Aldo Moro”, Via E. Orabona, 4, 70125 Bari, Italy; (N.G.); (O.N.)
| | - Hoon Kim
- Department of Pharmacy, and Research Institute of Life Pharmaceutical Sciences, Sunchon National University, Suncheon 57922, Korea;
- Correspondence: (H.K.); or (B.M.)
| | - Bijo Mathew
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, Amrita Vishwa Vidyapeetham, AIMS Health Sciences Campus, Kochi 682 041, India
- Correspondence: (H.K.); or (B.M.)
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Özdemir Z, Karakurt A, Taşlidere E, Vardi N, Alagöz MA, Parlakpinar H, Uslu H, Bağ HG. Histological assessment of liver and stomach damage caused by pyridazinone derivative antidepressant agents. Biotech Histochem 2021; 97:355-362. [PMID: 34842474 DOI: 10.1080/10520295.2021.1999499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Depression is a serious psychological disorder that affects a significant population. We investigated the antidepressant activities of four pyridazinone derivatives that contain the hydrazide moiety using the forced swimming test (FST). The compounds tested exhibited good antidepressant activity compared to duloxetine. The most promising compound was compound 2, which reduced the duration of immobility during FST. The toxic effects of the four compounds on the histomorphology of the liver and stomach tissue also was evaluated.
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Affiliation(s)
- Zeynep Özdemir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, Malatya, Turkey
| | - Arzu Karakurt
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, Malatya, Turkey
| | - Elif Taşlidere
- Department of Embryology and Histology, Faculty of Medicine, Inonu University, Malatya, Turkey
| | - Nigar Vardi
- Department of Embryology and Histology, Faculty of Medicine, Inonu University, Malatya, Turkey
| | - Mehmet Abdullah Alagöz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, Malatya, Turkey
| | - Hakan Parlakpinar
- Department of Medical Pharmacology, Faculty of Medicine, Inonu University, Malatya, Turkey
| | - Harun Uslu
- Department of Anesthesiology, Vocational School of Health Services, Fırat University, Elazığ, Turkey
| | - Harika Gözükara Bağ
- Department of Biostatistics, Faculty of Medicine, Inonu University, Malatya, Turkey
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Synthesis, Cytotoxicity and Anti-Proliferative Activity Against AGS Cells of New 3(2 H)-Pyridazinone Derivatives Endowed with a Piperazinyl Linker. Pharmaceuticals (Basel) 2021; 14:ph14030183. [PMID: 33668893 PMCID: PMC7996573 DOI: 10.3390/ph14030183] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/16/2021] [Accepted: 02/22/2021] [Indexed: 02/07/2023] Open
Abstract
Novel twenty-three 3(2H)-pyridazinone derivatives were designed and synthesized based on the chemical requirements related to the anti-proliferative effects previously demonstrated within this scaffold. The introduction of a piperazinyl linker between the pyridazinone nucleus and the additional (un)substituted phenyl group led to some compounds endowed with a limited cytotoxicity against human gingival fibroblasts (HGFs) and good anti-proliferative effects against gastric adenocarcinoma cells (AGS) as evaluated by MTT and LDH assays, using doxorubicin as a positive control. Successive analyses revealed that the two most promising representative compounds (12 and 22) could exert their effects by inducing oxidative stress as demonstrated by the hydrogen peroxide release and the morphological changes (cell blebbing) revealed by light microscopy analysis after the haematoxylin-eosin staining. Moreover, to further assess the apoptotic process induced by compounds 12 and 22, Bax expression was measured by flow cytometry. These findings enlarged our knowledge of the structural requirements in this scaffold to display valuable biological effects against cancerous cell lines.
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Mekky AEM, Sanad SMH. Synthesis and in vitro study of new coumarin derivatives linked to nicotinonitrile moieties as potential acetylcholinesterase inhibitors. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4134] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ahmed E. M. Mekky
- Chemistry Department, Faculty of Science Cairo University Giza Egypt
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Özdemir Z, Alagöz MA, Uslu H, Karakurt A, Erikci A, Ucar G, Uysal M. Synthesis, molecular modelling and biological activity of some pyridazinone derivatives as selective human monoamine oxidase-B inhibitors. Pharmacol Rep 2020; 72:692-704. [PMID: 32144745 DOI: 10.1007/s43440-020-00070-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/03/2020] [Accepted: 01/08/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND Since brain neurotransmitter levels are associated with the pathology of various neurodegenerative diseases like Parkinson and Alzheimer, monoamineoxidase (MAO) plays a critical role in balancing these neurotransmitters in the brain. MAO isoforms appear as promising drug targets for the development of central nervous system agents. Pyridazinones have a broad array of biological activities. Here, six pyridazinone derivatives were synthesized and their human monoamine oxidase inhibitory activities were evaluated by molecular docking studies, in silico ADME prediction and in vitro biological screening tests. METHODS The compounds were synthesized by the reaction of different piperazine derivatives with 3 (2H)-pyridazinone ring and MAO-inhibitory effects were investigated. Docking studies were conducted with Maestro11.8 software. RESULTS Most of the synthesized compounds inhibited hMAO-B selectively except compound 4f. Compounds 4a-4e inhibited hMAO-B selectively and reversibly in a competitive mode. Compound 4b was found as the most potent (ki = 0.022 ± 0.001 µM) and selective (SI (Ki hMAO-A/hMAO-B) = 206.82) hMAO-B inhibitor in this series. The results of docking studies were found to be consistent with the results of the in vivo activity studies. Compounds 4a-4e were found to be non-toxic to HepG2 cells at 25 μM concentration. In silico calculations of ADME properties indicated that the compounds have good pharmacokinetic profiles. CONCLUSION It was concluded that 4b is possibly recommended as a promising nominee for the design and development of new pyridazinones which can be used in the treatment of neurological diseases.
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Affiliation(s)
- Zeynep Özdemir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, 44280, Malatya, Turkey.
| | - Mehmet Abdullah Alagöz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, 44280, Malatya, Turkey
| | - Harun Uslu
- Department of Anesthesiology, Vocational School of Health Services, Fırat University, 23119, Elazığ, Turkey
| | - Arzu Karakurt
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, 44280, Malatya, Turkey
| | - Acelya Erikci
- Department of Biochemistry, Faculty of Pharmacy, Lokman Hekim University, 06510, Ankara, Turkey
| | - Gulberk Ucar
- Department of Biochemistry, Faculty of Pharmacy, Lokman Hekim University, 06510, Ankara, Turkey
| | - Mehtap Uysal
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Gazi University, 06100, Ankara, Turkey
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Design, synthesis, and bioevaluation of novel oxoindolin-2-one derivatives incorporating 1-benzyl-1H-1,2,3-triazole. Med Chem Res 2019. [DOI: 10.1007/s00044-019-02488-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Design, synthesis, and in vitro evaluation of novel 1,3,4-oxadiazolecarbamothioate derivatives of Rivastigmine as selective inhibitors of BuChE. Med Chem Res 2019. [DOI: 10.1007/s00044-019-02475-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Özçelik AB, Özdemir Z, Sari S, Utku S, Uysal M. A new series of pyridazinone derivatives as cholinesterases inhibitors: Synthesis, in vitro activity and molecular modeling studies. Pharmacol Rep 2019; 71:1253-1263. [DOI: 10.1016/j.pharep.2019.07.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 07/08/2019] [Accepted: 07/19/2019] [Indexed: 11/26/2022]
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12
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Bozbey İ, Özdemir Z, Uslu H, Özçelik AB, Şenol FS, Orhan İE, Uysal M. A Series of New Hydrazone Derivatives: Synthesis, Molecular Docking and Anticholinesterase Activity Studies. Mini Rev Med Chem 2019; 20:1042-1060. [PMID: 31660824 DOI: 10.2174/1389557519666191010154444] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 11/01/2018] [Accepted: 09/12/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) are known to be serine hydrolase enzymes responsible for the hydrolysis of acetylcholine (ACh), which is a significant neurotransmitter for regulation of cognition in animals. Inhibition of cholinesterases is an effective method to curb Alzheimer's disease, a progressive and fatal neurological disorder. OBJECTIVE In this study, 30 new hydrazone derivatives were synthesized. Then we evaluated their anticholinesterase activity of compounds. We also tried to get insights into binding interactions of the synthesized compounds in the active site of both enzymes by using molecular docking approach. METHODS The compounds were synthesized by the reaction of various substituted/nonsubstituted benzaldehydes with 6-(substitute/nonsubstituephenyl)-3(2H)-pyridazinone-2-yl propiyohydrazide. Anticholinesterase activity of the compounds was determined using Ellman's method. Molecular docking studies were done by using the ADT package version 1.5.6rc3 and showed by Maestro. RMSD values were obtained using Lamarckian Genetic Algorithm and scoring function of AutoDock 4.2 release 4.2.5.1 software. RESULTS The activities of the compounds were compared with galantamine as cholinesterase enzyme inhibitor, where some of the compounds showed higher BChE inhibitory activity than galantamine. Compound F111 was shown to be the best BChE inhibitor effective in 50 μM dose, providing 89.43% inhibition of BChE (IC50=4.27±0.36 μM). CONCLUSION This study supports that novel hydrazone derivates may be used for the development of new BChE inhibitory agents.
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Affiliation(s)
- İrem Bozbey
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Erzincan Binali Yıldırım University, Erzincan 24100, Turkey
| | - Zeynep Özdemir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Inonu University, Malatya 44280, Turkey
| | - Harun Uslu
- Department of Medical Services and Techniques, Vocational School of Health Services, Firat University, Elazıg 23040, Turkey
| | - Azime Berna Özçelik
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Gazi University, Ankara 06100, Turkey
| | - Fatma Sezer Şenol
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Ankara 06100, Turkey
| | - İlkay Erdoğan Orhan
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Ankara 06100, Turkey
| | - Mehtap Uysal
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Erzincan Binali Yıldırım University, Erzincan 24100, Turkey.,Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Gazi University, Ankara 06100, Turkey
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El-Badry YAM, Sallam MS, El-Hashash MAA. Efficient 1,3,4-Thiadiazole-4,5-dihydropyridazin-3(2H)-ones as Antimicrobial Agents. Chem Pharm Bull (Tokyo) 2018; 66:427-433. [PMID: 29607908 DOI: 10.1248/cpb.c17-00918] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A set of novel series of 1,3,4-thiadiazolyl-sulfanyl-4,5-dihydropyridazin-3(2H)-ones with anticipated antimicrobial activity has been synthesized. The synthetic protocol of the targeted compounds was accomplished by treating β-aroylacrylic acid 1 with 5-amino-1,3,4-thiadiazole-2-thiol (2) to afford the thia-Michael adduct 3. Afterwards, the obtained thia-Michael adduct 3 was cyclized to 4,5-dihydropyridazin-3(2H)-ones 4a-d and the non-cyclized product hydrazone 5 by using different hydrazines. Moreover, adduct 3 was reacted with esters like diethyl malonate and ethyl acetoacetate affording 1,3,4-thiadiazolobutanamides 6a, b. Furthermore, the concurrent reaction of later butamides 6a, b with the hydrazine derivatives furnished thiadiazolopyridazin-3(2H)-ones 7a-d, 8, and butanoic acid 9.
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Affiliation(s)
- Yaser Abdel-Moemen El-Badry
- Organic Chemistry Lab., Faculty of Specific Education, Ain Shams University.,Organic Chemistry Dep., Faculty of Science, Taif University
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