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Maurya MR, Kumar N, Avecilla F. Controlled Modification of Triaminoguanidine-Based μ 3 Ligands in Multinuclear [V IVO]/[V VO 2] Complexes and Their Catalytic Potential in the Synthesis of 2-Amino-3-cyano-4 H-pyrans/4 H-chromenes. Inorg Chem 2024; 63:2505-2524. [PMID: 38243891 DOI: 10.1021/acs.inorgchem.3c03704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2024]
Abstract
Reaction of tris(2-hydroxybenzylidene)-triaminoguanidinium chloride (I·HCl) and tris(5-bromo-2-hydroxybenzylidene)-triaminoguanidinium chloride (II·HCl) with [VIVO(acac)2] (1:1 molar ratio) in refluxing methanol resulted in mononuclear [VIVO] complexes, [VIVO(H2L1')(MeOH)] (1) and [VIVO(H2L2')(MeOH)] (2), respectively, where I and II undergo intramolecular triazole ring formation. Aerial oxidation of 1 and 2 in MeOH in the presence of Cs2CO3 gave corresponding cis-[VVO2] complexes Cs[(VO2)(H2L1')] (3) and Cs[(VO2)(H2L2')] (4). However, reaction of an aerially oxidized methanolic solution of [VIVO(acac)2] with I·HCl and II·HCl in the presence of Cs2CO3 (in 1:1:1 molar ratio) gave mononuclear complexes Cs[(VO2)(H3L1)] (5) and Cs[(VO2)(H3L2)] (6) without intramolecular triazole ring formation. Similar anionic trinuclear complexes Cs2[(VO2)3(L1)] (7) and Cs2[(VO2)3(L2)] (8) were isolable upon increasing the amounts of the vanadium precursor and Cs2CO3 to 3 equiv to the reaction applied for 5 and 6. Keeping the reaction mixture of 1 in MeOH under air gave [VVO(H2L1')(OMe)] (9). Structures of 3, 7, 8, and 9 were confirmed by X-ray crystal structure study. A permanent porosity in the crystalline metal-organic framework of 7 confirmed by single-crystal X-ray investigation was further verified by the BET study. Along with a suitable reaction mechanism, these synthesized compounds were explored as effective catalysts for the synthesis of biomolecules 4H-pyran/4H-chromenes.
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Affiliation(s)
- Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Naveen Kumar
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Fernando Avecilla
- Universidade da Coruña, Grupo NanoToxGen, Centro Interdisciplinar de Química y Biología (CICA), Departamento de Química, Facultade de Ciencias, Campus de A Coruña, 15071A Coruña, Spain
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2
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Chatterjee R, Bhukta S, Dandela R. Ionic
liquid‐assisted
synthesis of
2‐amino‐3‐cyano‐4
H
‐chromenes: A sustainable overview. J Heterocycl Chem 2021. [DOI: 10.1002/jhet.4417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rana Chatterjee
- Department of Industrial and Engineering Chemistry Institute of Chemical Technology‐Indian Oil Odisha Campus Bhubaneswar India
| | - Swadhapriya Bhukta
- Department of Industrial and Engineering Chemistry Institute of Chemical Technology‐Indian Oil Odisha Campus Bhubaneswar India
| | - Rambabu Dandela
- Department of Industrial and Engineering Chemistry Institute of Chemical Technology‐Indian Oil Odisha Campus Bhubaneswar India
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3
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Dalal DS, Patil DR, Tayade YA. β‐Cyclodextrin: A Green and Efficient Supramolecular Catalyst for Organic Transformations. CHEM REC 2018; 18:1560-1582. [DOI: 10.1002/tcr.201800016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/07/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Dipak S. Dalal
- Department of Organic Chemistry, School of Chemical SciencesNorth Maharashtra University Jalgaon – 425 001 (M. S.) India
| | - Dipak R. Patil
- Department of Organic Chemistry, School of Chemical SciencesNorth Maharashtra University Jalgaon – 425 001 (M. S.) India
| | - Yogesh A. Tayade
- Department of Organic Chemistry, School of Chemical SciencesNorth Maharashtra University Jalgaon – 425 001 (M. S.) India
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4
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Brahmachari G, Nurjamal K. Facile and Chemically Sustainable Catalyst-Free Synthesis of Diverse 2-Aryl-4-Alkyl/Aryl-Pyrano[3,2-c]chromen-5(4H)-Ones by One-Pot Multicomponent Reactions at Room Temperature. ChemistrySelect 2017. [DOI: 10.1002/slct.201700687] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Goutam Brahmachari
- Laboratory of Natural Products & Organic Synthesis; Department of Chemistry; Visva-Bharati (a Central University); Santiniketan-731 235, West Bengal India
| | - Khondekar Nurjamal
- Laboratory of Natural Products & Organic Synthesis; Department of Chemistry; Visva-Bharati (a Central University); Santiniketan-731 235, West Bengal India
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5
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Peña R, Martín P, Feresin GE, Tapia A, Machín F, Estévez-Braun A. Domino Synthesis of Embelin Derivatives with Antibacterial Activity. JOURNAL OF NATURAL PRODUCTS 2016; 79:970-977. [PMID: 26924672 DOI: 10.1021/acs.jnatprod.5b01038] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A series of dihydropyran embelin derivatives was synthesized through a direct and highly efficient approach based on a domino Knoevenagel intramolecular hetero-Diels-Alder reaction from natural embelin (1), using unsaturated aldehydes in the presence of organocatalysts such as ethylendiamine diacetate or l-proline. The aliphatic aldehydes yielded exclusively trans adducts, while mixtures of trans and cis isomers were found in reactions with aromatic aldehydes, with the cis form always predominating. Some of the compounds obtained were active and selective against Gram-positive bacteria, including multiresistant Staphylococcus aureus clinical isolates.
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Affiliation(s)
- Rosalyn Peña
- Instituto Universitario de Bio-Orgánica Antonio González (CIBICAN), Departamento de Química Orgánica, Universidad de La Laguna , Avenida Astrofísico Francisco Sánchez No. 2, 38206, La Laguna, Tenerife, Spain
| | - Pedro Martín
- Instituto Universitario de Bio-Orgánica Antonio González (CIBICAN), Departamento de Química Orgánica, Universidad de La Laguna , Avenida Astrofísico Francisco Sánchez No. 2, 38206, La Laguna, Tenerife, Spain
| | - Gabriela E Feresin
- Instituto de Biotecnología-Instituto de Ciencias Básicas, Universidad Nacional de San Juan , Avenida Libertador General San Martín 1109 (O), CP 5400, San Juan, Argentina
| | - Alejandro Tapia
- Instituto de Biotecnología-Instituto de Ciencias Básicas, Universidad Nacional de San Juan , Avenida Libertador General San Martín 1109 (O), CP 5400, San Juan, Argentina
| | - Félix Machín
- Unidad de Investigación, Hospital Universitario Nuestra Señora de Candelaria , Carretera del Rosario 145, 38010, Santa Cruz de Tenerife, Spain
| | - Ana Estévez-Braun
- Instituto Universitario de Bio-Orgánica Antonio González (CIBICAN), Departamento de Química Orgánica, Universidad de La Laguna , Avenida Astrofísico Francisco Sánchez No. 2, 38206, La Laguna, Tenerife, Spain
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6
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Brahmachari G. Design of Organic Transformations at Ambient Conditions: Our Sincere Efforts to the Cause of Green Chemistry Practice. CHEM REC 2015; 16:98-123. [DOI: 10.1002/tcr.201500229] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Goutam Brahmachari
- Laboratory of Natural Products & Organic Synthesis, Department of Chemistry, Visva-Bharati (Central University); Santiniketan 731 235 West Bengal India
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7
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Maddila SN, Maddila S, van Zyl WE, Jonnalagadda SB. Ceria-Vanadia/Silica-Catalyzed Cascade for C-C and C-O Bond Activation: Green One-Pot Synthesis of 2-Amino-3-cyano-4H-pyrans. ChemistryOpen 2015; 5:38-42. [PMID: 27308209 PMCID: PMC4906492 DOI: 10.1002/open.201500159] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Indexed: 11/06/2022] Open
Abstract
We designed a ceria-vanadia/silica (Ce-V/SiO2) heterogeneous catalyst and used it for the green and efficient synthesis of 2-amino-3-cyano-4H-pyran derivatives. The green reaction was a multicomponent one-pot condensation of 5,5-dimethylcyclohexane-1,3-dione, aromatic aldehyde, and malononitrile in an eco-compatible solvent (ethanol). The catalyst was synthesized and fully characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis. The reported procedure offers a number of advantages including decreased reaction times, mild conditions, high yields, operational simplicity, and environmentally benign and simple work-up procedures. Furthermore, the catalyst is economical, fully recyclable, and reusable for over five runs while preserving its high activity. The synthesized 2-amino-3-cyano-4H-pyran products can later be used for pharmaceutical purposes.
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Affiliation(s)
- Surya Narayana Maddila
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
| | - Suresh Maddila
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
| | - Werner E van Zyl
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
| | - Sreekantha B Jonnalagadda
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
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8
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Rana S, Maddila S, Yalagala K, Maddila S, Jonnalagadda SB. Covalent Modification of Organo-Functionalized Graphene Oxide and its Scope as Catalyst for One-Pot Pyrazolo-Pyranopyrimidine Derivatives. ChemistryOpen 2015; 4:703-7. [PMID: 27308195 PMCID: PMC4906497 DOI: 10.1002/open.201500121] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Indexed: 11/11/2022] Open
Abstract
The surface of graphene oxide (GO) was modified using [3‐(2‐aminoethylamino)propyl]trimethoxysilane (diamine), which exhibited excellent catalytic activity for one‐pot multicomponent reactions. The newly synthesized material was fully characterized by various instrumental techniques including Fourier‐transfer infrared (FTIR) and Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The instrumental analysis confirmed the successful grafting of organic amine functional groups onto the graphene oxide surface. The diamine‐functionalized GO proved to be an excellent catalyst for the synthesis of pyrazolo‐pyranopyrimidine derivatives with 93 % yield and high selectivity. The catalytic activity almost remained unaltered up to three cycles. The newly synthesized pyrazolo‐pyranopyrimidine derivatives have potential use as scaffolds in designing new pharmaceutical products.
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Affiliation(s)
- Surjyakanta Rana
- School of Chemistry & Physics University of KwaZulu-Natal University Rd Durban 4000 South Africa
| | - Suresh Maddila
- School of Chemistry & Physics University of KwaZulu-Natal University Rd Durban 4000 South Africa
| | - Kotaiah Yalagala
- School of Chemistry & Physics University of KwaZulu-Natal University Rd Durban 4000 South Africa
| | - Suryanarayana Maddila
- School of Chemistry & Physics University of KwaZulu-Natal University Rd Durban 4000 South Africa
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9
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Ramesh R, Lalitha A. Synthesis of pyran annulated heterocyclic scaffolds: a highly convenient protocol using dimethylamine. RESEARCH ON CHEMICAL INTERMEDIATES 2014. [DOI: 10.1007/s11164-014-1873-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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First I2–K2CO3-promoted sequential C–N and C–O bond forming approach for one-pot synthesis of 1,4-benzoxazines. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.10.092] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Khelili S, Kihal N, Yekhlef M, de Tullio P, Lebrun P, Pirotte B. Synthesis and pharmacological activity of N-(2,2-dimethyl-3,4-dihydro-2H-1-benzopyran-4-yl)-4H-1,2,4-benzothiadiazine-3-carboxamides 1,1-dioxides on rat uterus, rat aorta and rat pancreatic β-cells. Eur J Med Chem 2012; 54:873-8. [PMID: 22647221 DOI: 10.1016/j.ejmech.2012.05.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 05/03/2012] [Accepted: 05/03/2012] [Indexed: 10/28/2022]
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12
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Boominathan M, Nagaraj M, Muthusubramanian S, Krishnakumar RV. Efficient atom economical one-pot multicomponent synthesis of densely functionalized 4H-chromene derivatives. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.06.021] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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A new efficient method for the synthesis of 3,4-dihydro-2H-1,4-benzoxazines via iodocyclization. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.08.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Erb BÉNÉD, Akue R, Rigo B, Pirotte B, Couturier D. Synthesis of 2-aminoquinazolinc-4(3H)-one derivatives as potential potassium channel openers. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.5570370206] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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The synthesis and biological evaluation of a range of novel functionalised benzopyrans as potential potassium channel activators. Bioorg Med Chem Lett 2008; 18:1237-40. [DOI: 10.1016/j.bmcl.2007.11.135] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Revised: 11/22/2007] [Accepted: 11/26/2007] [Indexed: 11/22/2022]
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16
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Mizar P, Myrboh B. Synthesis of substituted 4-(3-alkyl-1,2,4-oxadiazol-5-ylmethyl)-3,4-dihydro-2H-1,4-benzoxazines and 4-(1H-benzimidazol-2-ylmethyl)-3,4-dihydro-2H-1,4-benzoxazines. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.08.029] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Khelili S, Lebrun P, de Tullio P, Pirotte B. Synthesis and pharmacological evaluation of some N-arylsulfonyl-N-methyl-N′-(2,2-dimethyl-2H-1-benzopyran-4-yl)ureas structurally related to cromakalim. Bioorg Med Chem 2006; 14:3530-4. [PMID: 16455262 DOI: 10.1016/j.bmc.2006.01.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2005] [Revised: 12/22/2005] [Accepted: 01/06/2006] [Indexed: 11/18/2022]
Abstract
Some N-arylsulfonyl-N-methyl-N'-(2,2-dimethyl-2H-1-benzopyran-4-yl)ureas were prepared and evaluated as putative potassium channel openers on the vascular and uterine smooth muscle tissue (myorelaxant effect), as well as on insulin-secreting pancreatic islets (inhibition of insulin release). The pharmacological results indicated that these compounds exhibited a marked biological activity on these three tissues.
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Affiliation(s)
- Smail Khelili
- Laboratoire de Chimie Pharmaceutique, de Pharmacologie et d'Ecotoxicologie, Faculté des Sciences, Université de Jijel, B.P. 98 Ouled Aissa, 18000 Jijel, Algeria
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18
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Carosati E, Lemoine H, Spogli R, Grittner D, Mannhold R, Tabarrini O, Sabatini S, Cecchetti V. Binding studies and GRIND/ALMOND-based 3D QSAR analysis of benzothiazine type K(ATP)-channel openers. Bioorg Med Chem 2005; 13:5581-91. [PMID: 16002299 DOI: 10.1016/j.bmc.2005.06.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2005] [Revised: 05/27/2005] [Accepted: 06/03/2005] [Indexed: 11/28/2022]
Abstract
For seventeen 1,4-benzothiazine potassium channel openers, we performed binding studies in rat aortic smooth muscle cells and cardiomyocytes, compared their binding affinities with published relaxation data, and derived 3D-QSAR models using GRIND/ALMOND descriptors. Binding affinities in smooth muscle cells range from a pK(D) of 4.76 for compound 3e to 9.10 for compound 4c. Comparison of data for smooth muscle relaxation and binding shows preferentially higher pEC(50)s for the former. In cardiomyocytes, pK(D) values range from 4.21 for 3e to 8.16 for 4c. 3D-QSAR analysis resulted in PLS models of two latent variables for all three activities with determination coefficients of 0.97 (smooth muscle relaxation) and 0.94 (smooth muscle cells- and cardiomyocytes-binding). Internal validation yielded q(2) values of 0.69, 0.66, and 0.64. The carbonyl on the N-4 substituent, the hydrogen bond acceptor at C-6, the five-membered ring at N-4, and the gem-dimethyls mainly guide strong binding and strong smooth muscle relaxation.
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MESH Headings
- Adenosine Triphosphate/physiology
- Animals
- Aorta/cytology
- Aorta/drug effects
- Aorta/physiology
- Binding, Competitive/drug effects
- Binding, Competitive/physiology
- Computer Simulation
- Dose-Response Relationship, Drug
- Male
- Models, Molecular
- Molecular Conformation
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/physiology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/physiology
- Potassium Channels/drug effects
- Potassium Channels/physiology
- Quantitative Structure-Activity Relationship
- Radioligand Assay
- Rats
- Rats, Wistar
- Structure-Activity Relationship
- Thiazines/chemical synthesis
- Thiazines/chemistry
- Thiazines/pharmacology
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Affiliation(s)
- Emanuele Carosati
- Laboratorio di Chemiometria e Chemioinformatica, Dipartimento di Chimica, Università di Perugia, Via Elce di Sotto 10, I-06123 Perugia, Italy
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19
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Mannhold R. KATP channel openers: structure-activity relationships and therapeutic potential. Med Res Rev 2004; 24:213-66. [PMID: 14705169 DOI: 10.1002/med.10060] [Citation(s) in RCA: 132] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
ATP-sensitive potassium channels (K(ATP) channels) are heteromeric complexes of pore-forming inwardly rectifying potassium channel subunits and regulatory sulfonylurea receptor subunits. K(ATP) channels were identified in a variety of tissues including muscle cells, pancreatic beta-cells, and various neurons. They are regulated by the intracellular ATP/ADP ratio; ATP induces channel inhibition and MgADP induces channel opening. Functionally, K(ATP) channels provide a means of linking the electrical activity of a cell to its metabolic state. Shortening of the cardiac action potential, smooth muscle relaxation, inhibition of both insulin secretion, and neurotransmitter release are mediated via K(ATP) channels. Given their many physiological functions, K(ATP) channels represent promising drug targets. Sulfonylureas like glibenclamide block K(ATP) channels; they are used in the therapy of type 2 diabetes. Openers of K(ATP) channels (KCOs), for example, relax smooth muscle and induce hypotension. KCOs are chemically heterogeneous and include as different classes as the benzopyrans, cyanoguanidines, thioformamides, thiadiazines, and pyridyl nitrates. Examples for new chemical entities more recently developed as KCOs include cyclobutenediones, dihydropyridine related structures, and tertiary carbinols.
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Affiliation(s)
- Raimund Mannhold
- Department of Laser Medicine, Molecular Drug Research Group, Heinrich-Heine-Universität, Universitätsstrasse 1, 40225 Düsseldorf, Germany.
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20
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Lin MS, Hsin LW, Cheng CY. Synthesis of 3-[4-Acyl-2-(1-methoxy-1-methylethyl)morpholin-3-yl]-benzonitriles as Novel Potassium Channel Openers. J CHIN CHEM SOC-TAIP 2004. [DOI: 10.1002/jccs.200400024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Chiu I, Lin YC, Cheng CY, Tsai MC, Yu HC. N-Acyl-1,2,3,4a,5,10b-hexahydro-[1]benzopyrano-[3,4-b][1,4]oxazine-9-carbonitriles as bladder-selective potassium channel openers. Bioorg Med Chem 2001; 9:383-93. [PMID: 11249131 DOI: 10.1016/s0968-0896(00)00260-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Optically active N-acyl-5,5-dimethyl-1,2,3,4a,5,10b-hexahydro-[1]benzopyrano[3,4-b][1,4]oxazine-9-carbonitriles 2-22 were synthesized as rigid analogues of cromakalim. The (4aR, 10bR)-N-benzoyl derivative (-)-11 was identified as a bladder-selective KCO (IC50, bladder = 8.2 microM, C50, portal vein = 34.5 microM). Among the analogues of 11 with substitution on the benzoyl moiety, the 3-methyl analogue (-)-14 showed highly potent and selective activity at portal vein (IC50, bladder = 279 microM, IC50, portal vein = 0.54 microM). The 4-bromo analogue (-)-19 (IC50, bladder = 2.0 microM, IC50, portal vein = 8.1 microM) and the 4-hydroxy analogue (-)-21 (IC50, bladder = 3.8 microM, IC50, portal vein = 75 microM) showed enhanced activity at the bladder, while maintaining unprecedented bladder selectivity in vitro. The N-benzenesulfonyl analogue (-)-22, a bioisoster of (-)-11, showed similar activity at the bladder with enhanced selectivity (IC50, bladder = 11.6 microM, IC50, portal vein = 120 microM).
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Affiliation(s)
- I Chiu
- Institute of Pharmaceutical Sciences, College of Medicine, National Taiwan University, Taipei
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22
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Arranz E, Díaz JA, Vega S, Campos-Toimil M, Orallo F, Cardelús I, Llenas J, Fernández AG. Synthesis and pharmacological evaluation of 2, 3-dihydro-3-oxo-4H-thieno[3,4-e][1,2,4]thiadiazine 1,1-dioxides as voltage-dependent calcium channel blockers. Eur J Med Chem 2000; 35:751-9. [PMID: 10960192 DOI: 10.1016/s0223-5234(00)00188-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The synthesis of a novel series of 2,3-dihydro-3-oxo-4H-thieno[3, 4-e][1,2,4]thiadiazine 1,1-dioxides and their pharmacological evaluation as drugs with effects on the rat cardiovascular system are described. The compounds under study were synthesized via Curtius rearrangement of appropriate sulfamoylacylazides which, in turn, were prepared from known starting materials. In isolated rat portal vein, these thienothiadiazines, like verapamil and diazoxide, inhibited the spontaneous motility produced by KCl (20 mM). In addition, the new compounds, like verapamil and unlike diazoxide, also exhibited inhibitory effects in the same preparation when the cell membrane was depolarized by an increased extracellular KCl concentration (80 mM) and, consequently, the membrane potential approached a level close to the K(+) equilibrium potential. Further characterization of this inhibitory activity led to the identification of a selective inhibitory effect of the new compounds on KCl (80 mM)-induced 45Ca(2+) uptake in the same vascular tissue. When tested in vivo (anaesthetized normotensive rats), acute administration of verapamil, diazoxide and some of the most in vitro potent compounds in 45Ca(2+) uptake experiments produced a gradual, dose-dependent and sustained decrease in diastolic arterial blood pressure, devoid of cardiac effects. These results suggest that, like verapamil, the cardiovascular effects produced by the new thienothiadiazines seem to be due, at least in part, to a blockade of transmembrane voltage-dependent calcium channels present in vascular smooth muscle cells and not to an activation of ATP-sensitive K(+) channels. Compounds 5b, 5e and 5i have been selected for further studies as antihypertensive agents.
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Affiliation(s)
- E Arranz
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, 28006, Madrid, Spain
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23
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Cheng CY, Chiu HI, Chang MJ, Lin YC, Tsai MC, Yu HC. Synthesis of 2,3,4a,11b-tetrahydro-oxazino[2,3-c]benzopyran-9-carbonitriles as ATP-sensitive potassium channel openers. Bioorg Med Chem Lett 1998; 8:463-8. [PMID: 9871599 DOI: 10.1016/s0960-894x(98)00046-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A series of optically active tetrahydro-oxazino[2,3-c]benzopyran derivatives have been synthesized and evaluated for potassium channel opening activity. (4aR,11bR)-1-Benzoyl- 5,5-dimethyl-2,3,4a,11b-tetrahydro-oxazino[2,3-c]benzopyran-9-carb onitrile ((-)-11e) was identified as a bladder-selective potassium channel opener (IC50, bladder = 8.15 microM, IC50, portal vein = 34.5 microM).
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Affiliation(s)
- C Y Cheng
- Institute of Pharmaceutical Sciences, College of Medicine, National Taiwan University, Taipei, Taiwan
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Martínez A, Castro A, Cardelús I, Llenas J, Palacios JM. Arylimino-1,2,4-thiadiazolidinones: a new family of potassium channel openers. Bioorg Med Chem 1997; 5:1275-83. [PMID: 9377087 DOI: 10.1016/s0968-0896(97)00077-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A series of arylimino-1,2,4-thiadiazolidines were prepared using an efficient synthesis starting from thiadiazolopyridinium chlorides. All the compounds showed smooth muscular relaxant properties in rat portal veins. The different behaviour under highly depolarized conditions and the reduction of the biological effect by glyburide suggests that the arylimino-1,2,4-thiadiazolidin-3-ones may act, at least in part, via K+-induced hyperpolarization of vascular smooth cells.
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Affiliation(s)
- A Martínez
- Instituto de Química Médica (CSIC), Madrid, Spain
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Schostarez HJ, O'Sullivan TJ, Groppi VE, Cipkus-Dubray LA. Cyanoguanidine bioisosteres in potassium channel openers: Evaluation of 3,4-disubstituted-1,2,5-thiadiazole-1-oxides. Bioorg Med Chem Lett 1996. [DOI: 10.1016/0960-894x(96)00397-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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