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Manjunath BN, Panga SR, Hall RG, Shyadligeri A, Shete SA. Synthesis of N–C Fused Bicyclic 1,3,5-Triazinane-2,4-dione Derivatives from Saturated Ring-Fused Urazoles. Synlett 2023. [DOI: 10.1055/s-0042-1751410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
AbstractA synthesis of novel bicyclic 1,3,5-triazinane-2,4-diones has been accomplished through base-promoted fragmentation followed by cyclization. Various saturated ring-fused bicyclic urazoles were prepared by two complementary methods: by the reaction of N,N′-bis(2-chloroethyl)urazoles with various nucleophiles or by using 4-substituted urazoles and dibromoalkanes. Treatment of these symmetrical urazole derivatives with LDA at –78 °C to 25 °C resulted in fragmentation of the N–N bond to form an imine that underwent intramolecular cyclization, resulting in moderate yields of nonsymmetric heterocycle derivatives with an asymmetric (racemic) center and various ring sizes. The utility of these transformations was extended to syntheses of a tricyclic system and bicyclic systems containing additional heteroatoms.
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Affiliation(s)
| | - Subhaskar R. Panga
- Syngenta Biosciences Private Limited
- Department of Chemistry, Mangalore University
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2
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The Structural and Optical Properties of 1,2,4-Triazolo[4,3- a]pyridine-3-amine. Molecules 2022; 27:molecules27030721. [PMID: 35163987 PMCID: PMC8838196 DOI: 10.3390/molecules27030721] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 01/17/2022] [Accepted: 01/18/2022] [Indexed: 11/17/2022] Open
Abstract
The structural and spectroscopic properties of a new triazolopyridine derivative (1,2,4-triazolo[4,3-a]pyridin-3-amine) are described in this paper. Its FTIR spectrum was recorded in the 100–4000 cm−1 range and its FT-Raman spectrum in the range 80–4000 cm−1. The molecular structure and vibrational spectra were analyzed using the B3LYP/6-311G(2d,2p) approach and the GAUSSIAN 16W program. The assignment of the observed bands to the respective normal modes was proposed on the basis of PED calculations. XRD studies revealed that the studied compound crystallizes in the centrosymmetric monoclinic space group P21/n with eight molecules per unit cell. However, the asymmetric unit contains two 1,2,4-triazolo[4,3-a]pyridin-3-amine molecules linked via N–H⋯N hydrogen bonds with a R22(8) graph. The stability of the studied molecule was considered using NBO analysis. Electron absorption and the luminescence spectra were measured and discussed in terms of the calculated singlet, triplet, HOMO and LUMO electron energies. The Stokes shifts derived from the optical spectra were equal to 9410 cm−1 for the triazole ring and 7625 cm−1 for the pyridine ring.
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Singh S, Mandal MK, Masih A, Saha A, Ghosh SK, Bhat HR, Singh UP. 1,3,5-Triazine: A versatile pharmacophore with diverse biological activities. Arch Pharm (Weinheim) 2021; 354:e2000363. [PMID: 33760298 DOI: 10.1002/ardp.202000363] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 02/05/2021] [Accepted: 02/12/2021] [Indexed: 12/14/2022]
Abstract
1,3,5-Triazine and its derivatives have been the epicenter of chemotherapeutic molecules due to their effective biological activities, such as antibacterial, fungicidal, antimalarial, anticancer, antiviral, antimicrobial, anti-inflammatory, antiamoebic, and antitubercular activities. The present review represents a summarized report of the crucial biological activities possessed by substituted 1,3,5-triazine derivatives, with special attention to the most potent compounds.
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Affiliation(s)
- Saumya Singh
- Drug Design and Discovery Laboratory, Department of Pharmaceutical Sciences, Sam Higginbottom University of Agriculture, Technology, and Sciences, Allahabad, Uttar Pradesh, India
| | - Milan K Mandal
- Drug Design and Discovery Laboratory, Department of Pharmaceutical Sciences, Sam Higginbottom University of Agriculture, Technology, and Sciences, Allahabad, Uttar Pradesh, India
| | - Anup Masih
- Drug Design and Discovery Laboratory, Department of Pharmaceutical Sciences, Sam Higginbottom University of Agriculture, Technology, and Sciences, Allahabad, Uttar Pradesh, India
| | - Ashmita Saha
- Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh, Assam, India
| | - Surajit K Ghosh
- Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh, Assam, India
| | - Hans R Bhat
- Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh, Assam, India
| | - Udaya P Singh
- Drug Design and Discovery Laboratory, Department of Pharmaceutical Sciences, Sam Higginbottom University of Agriculture, Technology, and Sciences, Allahabad, Uttar Pradesh, India
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Flefel EM, El-Sofany WI, El-Shahat M, Naqvi A, Assirey E. Synthesis, Molecular Docking and in Vitro Screening of Some Newly Synthesized Triazolopyridine, Pyridotriazine and Pyridine⁻Pyrazole Hybrid Derivatives. Molecules 2018; 23:molecules23102548. [PMID: 30301217 PMCID: PMC6222704 DOI: 10.3390/molecules23102548] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/02/2018] [Accepted: 10/03/2018] [Indexed: 11/16/2022] Open
Abstract
A series of novel pyridine and fused pyridine derivatives have been prepared starting from 6-(3,4-dimethylphenyl)-2-hydrazinyl-4-(thiophen-2-yl)-pyridine-3-carbonitrile 1 which on treatment with appropriate formic acid, acetic acid/acetic anhydride, benzoyl chloride and/or carbon disulfide afforded the corresponding triazolopyridine derivatives 2–5. Also, treatment of hydrazide 1 with diethyloxalate, chloroacetyl chloride, chloroacetic acid and/or 1,2-dichloroethane yielded the corresponding pyridotriazine derivatives 7–10. Further transformation of compound 1 with a different active methylene group, namely acetyl acetone, diethylmalonate, ethyl cyanoacetate, ethyl benzoylacetate and/or ethyl acetoacetate, produced the pyridine–pyrazole hybrid derivatives 11–15. These newly synthesized compounds (1–15) were subjected to in silico molecular docking screenings towards GlcN-6-P synthase as the target protein. The results revealed moderate to good binding energies of the ligands on the target protein. All the newly prepared products exhibited antimicrobial and antioxidant activity.
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Affiliation(s)
- Eman M Flefel
- Department of Chemistry, College of Science, Taibah University, Al-Madinah Al-Monawarah 1343, Saudi Arabia.
- Department of Photochemistry, Chemical Industries Research Division, National Research Centre, 33 EL-Bohouth St., Dokki 12622, Giza, Egypt.
| | - Walaa I El-Sofany
- Department of Photochemistry, Chemical Industries Research Division, National Research Centre, 33 EL-Bohouth St., Dokki 12622, Giza, Egypt.
| | - Mahmoud El-Shahat
- Department of Photochemistry, Chemical Industries Research Division, National Research Centre, 33 EL-Bohouth St., Dokki 12622, Giza, Egypt.
| | - Arshi Naqvi
- Department of Chemistry, College of Science, Taibah University, Al-Madinah Al-Monawarah 1343, Saudi Arabia.
| | - Eman Assirey
- Department of Chemistry, College of Science, Taibah University, Al-Madinah Al-Monawarah 1343, Saudi Arabia.
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5
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Cao G, Chen Z, Song J, Xu J, Miao M, Ren H. Oxidant-Mediated Nitrogenation and Recyclization of Imidazo[1,2-a
]pyridines with Sodium Azide: Synthesis of 4H
-Pyrido[1,2-a
][1,3,5]triazin-4-ones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701480] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Gangjian Cao
- Department of Chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 People's Republic of China
| | - Zhengkai Chen
- Department of Chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 People's Republic of China
| | - Jinyu Song
- Department of Chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 People's Republic of China
| | - Jianfeng Xu
- Department of Chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 People's Republic of China
| | - Maozhong Miao
- Department of Chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 People's Republic of China
| | - Hongjun Ren
- Department of Chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 People's Republic of China
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Shimizu T, Shimizu S, Wada N, Takai S, Shimizu N, Higashi Y, Kadekawa K, Majima T, Saito M, Yoshimura N. Brain serotoninergic nervous system is involved in bombesin-induced frequent urination through brain 5-HT 7 receptors in rats. Br J Pharmacol 2017; 174:3072-3080. [PMID: 28675470 DOI: 10.1111/bph.13941] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 06/23/2017] [Accepted: 06/26/2017] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Psychological stress exacerbates symptoms of urinary bladder dysfunction; however, the underlying brain mechanisms are unclear. We have demonstrated that centrally administered bombesin, a stress-related neuropeptide, facilitates the rat micturition reflex. Brain bombesin-like peptides modulate the serotoninergic nervous system activity under stress conditions; therefore, we examined whether brain 5-HT is involved in the bombesin-induced increased frequency of urination in urethane-anaesthetised male Sprague-Dawley rats. EXPERIMENTAL APPROACH Evaluation of intercontraction intervals (ICI) and maximal voiding pressure (MVP) during cystometrograms were started 1 h before i.c.v. administration of bombesin or i.c.v. pretreatment with the 5-HT receptor antagonists. KEY RESULTS Bombesin (0.03 nmol per animal, i.c.v.) significantly reduced ICI without affecting MVP. The bombesin-induced response was significantly suppressed by acute depletion of brain 5-HT, which was induced by pretreatment with p-chlorophenylalanine, a 5-HT synthesis inhibitor. Bombesin at a lower dose (0.01 nmol per animal, i.c.v.) showed no significant effect on ICI, while it significantly reduced ICI in the presence of WAY-100635 (5-HT1A receptor antagonist, 0.1 or 0.3 μg per animal, i.c.v.), which can block the negative feedback control of 5-HT release. Bombesin (0.03 nmol per animal)-induced ICI reduction was significantly attenuated by SB269970 (5-HT7 receptor antagonist, 0.1 or 0.3 μg per animal, i.c.v.) but not by ritanserin (5-HT2 receptor antagonist, 0.3 or 1 μg per animal, i.c.v.). CONCLUSIONS AND IMPLICATIONS The brain serotoninergic nervous system is involved in the facilitation of the rat micturition reflex induced by bombesin-like peptides at least in part through brain 5-HT7 receptors.
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Affiliation(s)
- Takahiro Shimizu
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan.,Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shogo Shimizu
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Naoki Wada
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shun Takai
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Nobutaka Shimizu
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Youichirou Higashi
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Katsumi Kadekawa
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Tsuyoshi Majima
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Motoaki Saito
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Naoki Yoshimura
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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7
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On the reactivity of pyrido[3′,2′:4,5]furo(thieno)[3,2-d]pyrimidin-7(8)-ones with some alkyl mono- and di-halides: synthesis of new heterocyclic systems containing thiazolo[3,2-a]pyrimidine and pyrimido[2,1-b]thiazine moiety. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.07.069] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Martinez-Ariza G, Ayaz M, Medda F, Hulme C. Synthesis of diverse nitrogen-enriched heterocyclic scaffolds using a suite of tunable one-pot multicomponent reactions. J Org Chem 2014; 79:5153-62. [PMID: 24788091 PMCID: PMC4059217 DOI: 10.1021/jo500723d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Indexed: 01/22/2023]
Abstract
Five elegant and switchable three-component reactions which enable access to a new series of nitrogen-containing heterocycles are reported. A novel one-step addition of an isocyanide to a hydrazine derived Schiff base affords unique six-membered pyridotriazine scaffolds (A and E). With slight modification of reaction conditions and replacement of the nucleophilic isocyanide moiety with different electrophiles (i.e., isocyanates, isothiocyanates, cyclic anhydrides, and acyl chlorides) five-membered triazolopyridine scaffolds (B, D, F, G) are generated in a single step. Furthermore, the use of phenyl hydrazine enables access to dihydroindazole-carboxamides, devoid of a bridge-head nitrogen (C). All protocols are robust and tolerate a diverse collection of reactants, and as such, it is expected that the new scaffolds and associated chemistry will garner high interest from medicinal chemists involved in either file enhancement or specific target-related drug discovery campaigns.
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Affiliation(s)
- Guillermo Martinez-Ariza
- Department
of Pharmacology and Toxicology, College of Pharmacy BIO5 Oro Valley, The University of Arizona, 1580 East Hanley Boulevard, Oro Valley, Arizona 85737, United States
| | - Muhammad Ayaz
- Department
of Pharmacology and Toxicology, College of Pharmacy BIO5 Oro Valley, The University of Arizona, 1580 East Hanley Boulevard, Oro Valley, Arizona 85737, United States
| | - Federico Medda
- Department
of Pharmacology and Toxicology, College of Pharmacy BIO5 Oro Valley, The University of Arizona, 1580 East Hanley Boulevard, Oro Valley, Arizona 85737, United States
| | - Christopher Hulme
- Department
of Pharmacology and Toxicology, College of Pharmacy BIO5 Oro Valley, The University of Arizona, 1580 East Hanley Boulevard, Oro Valley, Arizona 85737, United States
- Department
of Chemistry and Biochemistry, The University
of Arizona, Tucson, Arizona 85721, United
States
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9
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Mannich reaction in the synthesis of N,S-containing heterocycles. 16.*Synthesis of derivatives of tetra-hydropyrido[1,2-a][1,3,5]triazine and 5,6,12,13-tetra-hydro-1H,8H-dipyrido[1,2-a:1',2'-e][1,3,5,7]tetrazocine. Chem Heterocycl Compd (N Y) 2013. [DOI: 10.1007/s10593-013-1339-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Chang MY, Wu TC, Lin ST. BF3-OEt2-Mediated Rearrangement of (4-Phenylpiperidin-4-Yl)-Arylmethanols. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200800070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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11
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Abstract
A series of novel [1,2,4]-triazolo piperidine (8), [1,2,4]-triazolo piperazine (9a-c), [1,2,4]-triazolo phenylether (10a-e), and [1,2,4]-triazolo aniline (11a-c) derivatives have been synthesized. The chemical structures of the newly synthesized compounds were characterized by IR,1H NMR,13C NMR, and LCMS. The newly synthesized compounds were screened for antimicrobial activity. Among all the compounds tested,11b(R4=4-MeO–) showed the highest activity againstStaphylococcus aureusandEscherichia coli, and9a(R1andR2=Cl) showed the highest activity againstPseudomonas aeruginosa.
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13
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Wu Q, Wang G, Huang S, Lin L, Yang G. Synthesis and biological activity of novel phenyltriazolinone derivatives. Molecules 2010; 15:9024-34. [PMID: 21150822 PMCID: PMC6259168 DOI: 10.3390/molecules15129024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Revised: 11/18/2010] [Accepted: 11/22/2010] [Indexed: 11/16/2022] Open
Abstract
Phenyltriazolinones are one of the most important classes of herbicides targeting the protoporphyrinogen oxidase enzyme. A series of triazolinone derivatives containing a strobilurin pharmacophore were designed and synthesized with the aim of discovering new phenyltriazolinone analogues with high activity. The herbicidal activity of the synthesized compounds was assayed and some of the test compounds displayed moderate herbicidal activity at 150 g ai/ha.
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Affiliation(s)
- Qiongyou Wu
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, Hubei, China.
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Zefirova ON, Zefirov NS. Physiologically active compounds interacting with serotonin (5-hydroxytryptamine) receptors. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc2001v070n04abeh000654] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Dotsenko VV, Krivokolysko SG, Rusanov EB, Gutov AV, Litvinov VP. The Mannich reaction in the synthesis of N,S-containing heterocycles 3. Unexpected direction of the aminomethylation reaction of N-methylmorpholinium 1-amino-2,4-dicyano-4-ethoxycarbonyl-1,3-butadienethiolate. One stage cascade synthesis of new derivatives of pyrido[1,2-a][1,3,5]triazine. Chem Heterocycl Compd (N Y) 2007. [DOI: 10.1007/s10593-007-0143-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Mittapalli GK, Reddy KR, Xiong H, Munoz O, Han B, De Riccardis F, Krishnamurthy R, Eschenmoser A. Mapping the Landscape of Potentially Primordial Informational Oligomers: Oligodipeptides and Oligodipeptoids Tagged with Triazines as Recognition Elements. Angew Chem Int Ed Engl 2007; 46:2470-7. [PMID: 17111452 DOI: 10.1002/anie.200603207] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Gopi Kumar Mittapalli
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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18
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Mittapalli G, Reddy K, Xiong H, Munoz O, Han B, De Riccardis F, Krishnamurthy R, Eschenmoser A. Mapping the Landscape of Potentially Primordial Informational Oligomers: Oligodipeptides and Oligodipeptoids Tagged with Triazines as Recognition Elements. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200603207] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Wang YF, Liu WM, Zhu YQ, Zou XM, Hu FZ, Yang HZ. Design, synthesis and biological evaluation of novel 6,7,8,9-tetrahydro-2-(2-aryloxypyrimidin-4-yl)-2H-[1,2,4]triazolo[4,3-a]azepin-3(5H)-ones. J Heterocycl Chem 2006. [DOI: 10.1002/jhet.5570430520] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Mannich reaction in the synthesis of N,S-containing heterocycles. 2. Convenient one-pot synthesis of 3,5,7,11-tetraazatricyclo[7.3.1.02,7]tridec-2-ene derivatives. Russ Chem Bull 2005. [DOI: 10.1007/s11172-006-0177-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Orallo F, Garcia-Ferreiro T, Enguix MJ, Tristan H, Masaguer C, Ravina E, Cadavid I, Loza MI. In vivo and in vitro pharmacological studies of a new hypotensive compound (QF0301B) in rat: comparison with prazosin, a known alpha1-adrenoceptor antagonist. Vascul Pharmacol 2003; 40:97-108. [PMID: 12646398 DOI: 10.1016/s1537-1891(02)00337-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we studied the in vivo and in vitro pharmacological effects of the novel compound QF0301B (2-[2-(N-4-o-methoxyphenyl-N-1-piperazinyl)ethyl]-1-tetralone) and compared with those of prazosin. In anaesthetized normotensive rats, both QF0301B and prazosin (0.1-0.2 mg/kg iv) caused a pronounced and prolonged fall in mean arterial blood pressure accompanied by bradycardia. Neither QF0301B nor prazosin (0.2 mg/kg iv) significantly modified the cardiovascular effects of either 5-hydroxytryptamine (serotonin, 5-HT, 75 microg/kg iv) or the selective alpha(2)-adrenoceptor agonist B-HT 920 (0.2 mg/kg iv), but both markedly inhibited the hypertensive effect of noradrenaline (5 microg/kg iv), a nonselective alpha-adrenergic receptor agonist. In isolated rubbed rat aorta rings, QF0301B and prazosin showed marked alpha(1)-adrenoceptor blocking activity, with pA(2) values of 9.00+/-0.12 and 9.75+/-0.14, respectively. In addition, QF0301B reversed and competitively antagonized the inhibitory action produced by clonidine in electrically stimulated rat vas deferens and inhibited the force and rate of contraction in rat isolated atria (pA(2)=5.91+/-0.43), competitively antagonized the contractile effect of 5-HT in rat aorta (pA(2)=6.75+/-0.06) and in rat stomach fundus (pA(2)=7.13+/-0.48) and the contractions induced by histamine in isolated guinea pig longitudinal ileal muscle (pA(2)=7.40+/-0.40). QF0301B showed noncompetitive low action in 5-HT(3), muscarinic and nicotinic receptors, or as Ca(2+) antagonist. These results indicate that a alpha(1)-adrenoceptor blocking lead has been obtained with a new chemical structure and interesting pharmacological properties, which only alpha(1)-adrenoceptor blocking activity seems to be responsible for its cardiovascular effects.
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Affiliation(s)
- Francisco Orallo
- Department of Pharmacology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Universitario Sur, Spain
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23
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Jones G. The chemistry of the triazolopyridines: an update. ADVANCES IN HETEROCYCLIC CHEMISTRY 2002. [DOI: 10.1016/s0065-2725(02)83003-3] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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24
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Talaga P, Matagne A, Klitgaard H. Pharmacological evaluation of a diarylmethylene-piperidine derivative: a new potent atypical antipsychotic? Bioorg Med Chem Lett 2001; 11:1313-6. [PMID: 11392544 DOI: 10.1016/s0960-894x(01)00200-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new diaryl-methylene piperidine derivative, 2, displayed an atypical antipsychotic profile both in vitro and in vivo. The main pharmacological characteristics of this compound appears to reside in a more potent antagonism of the 5-HT2 serotonergic receptor than of the D2 dopaminergic receptor. This confirms that molecules displaying a D2/5-HT2 binding ratio < 1 possess clozapine-like antipsychotic activity.
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Affiliation(s)
- P Talaga
- UCB SA, Pharma Sector, Chemin du Foriest, Braine-l'Alleud, Belgium.
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25
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Samnick S, Remy N, Ametamey S, Bader JB, Brandau W, Kirsch CM. 123I-MSP and F[11C]MSP: new selective 5-HT2A receptor radiopharmaceuticals for in vivo studies of neuronal 5-HT2 serotonin receptors. Synthesis, in vitro binding study with unlabelled analogues and preliminary in vivo evaluation in mice. Life Sci 1998; 63:2001-13. [PMID: 9839544 DOI: 10.1016/s0024-3205(98)00478-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In vitro binding study on bovine brain membranes using [3H]SCH23390, [3H]spiperone, [3H]prazosin and [3H]RP62203 as radioligands (for D1, D2, alpha1 and 5-HT2A receptors respectively) indicate that the new butyrophenones 8-[3-(4-fluorobenzoyl)propyl]-1-methyl-1,3,8-triazaspiro[4,5]de can-4-one (FMSP) and 8-[3-(4-iodobenzoyl)propyl]-1-methyl-1,3,8-triazaspiro[4,5]deca n-4-one (IMSP) exhibit a significantly higher selectivity for the 5-HT2A over D1, D2 and alpha1 receptors. Consequently, the radiolabelled analogues F[11C]MSP and 123I-MSP were prepared in attempt to obtain potential radiopharmaceuticals for in vivo imaging of neuronal 5-HT2A receptors with positron emission tomography (PET) and single photon emission tomography (SPET). F[11C]MSP was synthesized by reaction of [11C]CH3I with 8-[3-(4-fluorobenzoyl)propyl]-1,3,8-triazaspiro[4,5]decan-4- one (DMSP) in 12 +/- 3% radiochemical yield, whereas 123I-MSP was obtained in 82 +/- 8% radiochemical yield by a no-carrier-added Cu(I)-assisted [123I]iododebromination of 8-[3-(4-bromo-benzoyl)propyl]-1-methyl-1,3,8-triazaspiro[4,5]de can-4-ene (BrMSP). In vivo pharmacokinetic and brain binding characterization of 123I-MSP assessed in mice following intravenous injection, showed a fast clearance of 123I-MSP from blood and relatively high initial uptakes in the liver, kidneys and in the lung. Significant uptake and long retention were observed in the brain (up to 1.64% i.d., 60 min p.i.), with a regional accumulation of radioactivity consistent with the reported 5-HT2A receptors distribution in the brain. Frontal cortex to cerebellum ratio of 3.5 was calculated at 60 min p.i. Furthermore, the initial brain uptake was significantly reduced after pretreatment of the animals with ritanserin, a selective 5-HT2 antagonist, and by preinjection of the non-radiolabelled analog IMSP, thus indicating the specificity of the brain uptake. These data suggest that 123I-MSP may be a promising compound for studying the serotoninergic 5-HT2 receptors with SPET. Due to the low specific activity of F[11C]MSP currently obtained by the [11C]methylation reaction, systematic in vivo investigation of F[11C]MSP are as yet not feasable.
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Affiliation(s)
- S Samnick
- Department of Nuclear Medicine, University Medical School, Homburg/Saar.
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Claudi F, Scoccia L, Giorgioni G, Marucci G, Stefano AD, Gessi S, Siniscalchi A, Borea PA. Simplified analogues of ritanserin and their affinity at 5-HT2A, 5-HT2B and 5-HT2C serotonin receptors. Eur J Med Chem 1998. [DOI: 10.1016/s0223-5234(98)80029-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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A novel synthesis of 2-substituted pyrido[1,2-a]-1,3,5-triazin-4-ones by the reaction of N-fluoropyridinium salts with cyanate ion and carbonitriles: Evidence in support of a carbene intermediate. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)76512-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Watanabe Y, Yoshiwara H, Kanao M. Syntheses of 4-(benzo[b]furan-2 or 3-yl)- and 4-(benzo[b]-thiophen-3-yl)piperidines with 5-HT2antagonist activity. J Heterocycl Chem 1993. [DOI: 10.1002/jhet.5570300228] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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