1
|
Rodrigo MJ, Cardiel MJ, Fraile JM, Mendez-Martinez S, Martinez-Rincon T, Subias M, Polo V, Ruberte J, Ramirez T, Vispe E, Luna C, Mayoral JA, Garcia-Martin E. Brimonidine-LAPONITE® intravitreal formulation has an ocular hypotensive and neuroprotective effect throughout 6 months of follow-up in a glaucoma animal model. Biomater Sci 2020; 8:6246-6260. [PMID: 33016285 DOI: 10.1039/d0bm01013h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Intravitreal administration is widely used in ophthalmological practice to maintain therapeutic drug levels near the neuroretina and because drug delivery systems are necessary to avoid reinjections and sight-threatening side effects. However, currently there is no intravitreal treatment for glaucoma. The brimonidine-LAPONITE® formulation was created with the aim of treating glaucoma for extended periods with a single intravitreal injection. Glaucoma was induced by producing ocular hypertension in two rat cohorts: [BRI-LAP] and [non-bri], with and without treatment, respectively. Eyes treated with brimonidine-LAPONITE® showed lower ocular pressure levels up to week 8 (p < 0.001), functional neuroprotection explored by scotopic and photopic negative response electroretinography (p = 0.042), and structural protection of the retina, retinal nerve fibre layer and ganglion cell layer (p = 0.038), especially on the superior-inferior axis explored by optical coherence tomography, which was corroborated by a higher retinal ganglion cell count (p = 0.040) using immunohistochemistry (Brn3a antibody) up to the end of the study (week 24). Furthermore, delayed neuroprotection was detected in the contralateral eye. Brimonidine was detected in treated rat eyes for up to 6 months. Brimonidine-LAPONITE® seems to be a potential sustained-delivery intravitreal drug for glaucoma treatment.
Collapse
Affiliation(s)
- M J Rodrigo
- Department of Ophthalmology, Miguel Servet University Hospital, Zaragoza, Spain.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
2
|
Abstract
Cyclopropanation reactions in the chain of unsaturated fatty esters is a good strategy for the ready preparation of potential monomers for polymerization.
Collapse
Affiliation(s)
- B. Angulo
- Departamento de Catálisis y Procesos Catalíticos
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- Facultad de Ciencias
- 50009 Zaragoza
| | - J. M. Fraile
- Departamento de Catálisis y Procesos Catalíticos
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- Facultad de Ciencias
- 50009 Zaragoza
| | - C. I. Herrerías
- Departamento de Catálisis y Procesos Catalíticos
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- Facultad de Ciencias
- 50009 Zaragoza
| | - J. A. Mayoral
- Departamento de Catálisis y Procesos Catalíticos
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- Facultad de Ciencias
- 50009 Zaragoza
| |
Collapse
|
3
|
Busetti V, Mayoral JA, Cativiela C, Diaz de Villegas MD, Ajò D. Crystal structure of cyclic dehydroaminoacid derivatives. Z KRIST-CRYST MATER 2015. [DOI: 10.1524/zkri.1989.189.14.65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
4
|
Boudjema S, Vispe E, Choukchou-Braham A, Mayoral JA, Bachir R, Fraile JM. Preparation and characterization of activated montmorillonite clay supported 11-molybdo-vanado-phosphoric acid for cyclohexene oxidation. RSC Adv 2015. [DOI: 10.1039/c4ra13604g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Heterogenization of homogenous catalysts consisting of vanadium substituted polyphosphomolybdate with Keggin structure supported on activated bentonite for epoxidation of cyclohexene.
Collapse
Affiliation(s)
- S. Boudjema
- Laboratoire de Catalyse et Synthèse en Chimie Organique
- Faculté des Sciences
- Université de Tlemcen
- Algeria
| | - E. Vispe
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea
- Facultad de Ciencias
- Universidad de Zaragoza-CSIC
- E-50009 Zaragoza
| | - A. Choukchou-Braham
- Laboratoire de Catalyse et Synthèse en Chimie Organique
- Faculté des Sciences
- Université de Tlemcen
- Algeria
| | - J. A. Mayoral
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea
- Facultad de Ciencias
- Universidad de Zaragoza-CSIC
- E-50009 Zaragoza
| | - R. Bachir
- Laboratoire de Catalyse et Synthèse en Chimie Organique
- Faculté des Sciences
- Université de Tlemcen
- Algeria
| | - J. M. Fraile
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea
- Facultad de Ciencias
- Universidad de Zaragoza-CSIC
- E-50009 Zaragoza
| |
Collapse
|
5
|
Boudjema S, Vispe E, Choukchou-Braham A, Mayoral JA, Bachir R, Fraile JM. Correction: Preparation and characterization of activated montmorillonite clay supported 11-molybdo-vanado-phosphoric acid for cyclohexene oxidation. RSC Adv 2015. [DOI: 10.1039/c5ra90001h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘Preparation and characterization of activated montmorillonite clay supported 11-molybdo-vanado-phosphoric acid for cyclohexene oxidation’ by S. Boudjema et al., RSC Adv., 2015, 5, 6853–6863.
Collapse
Affiliation(s)
- S. Boudjema
- Laboratoire de Catalyse et Synthèse en Chimie Organique
- Faculté des Sciences
- Université de Tlemcen
- Algeria
| | - E. Vispe
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea
- Facultad de Ciencias
- Universidad de Zaragoza-CSIC
- E-50009 Zaragoza
| | - A. Choukchou-Braham
- Laboratoire de Catalyse et Synthèse en Chimie Organique
- Faculté des Sciences
- Université de Tlemcen
- Algeria
| | - J. A. Mayoral
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea
- Facultad de Ciencias
- Universidad de Zaragoza-CSIC
- E-50009 Zaragoza
| | - R. Bachir
- Laboratoire de Catalyse et Synthèse en Chimie Organique
- Faculté des Sciences
- Université de Tlemcen
- Algeria
| | - J. M. Fraile
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea
- Facultad de Ciencias
- Universidad de Zaragoza-CSIC
- E-50009 Zaragoza
| |
Collapse
|
6
|
De Torres M, Jiménez-Osés G, Mayoral JA, Pires E. Fatty acid derivatives and their use as CFPP additives in biodiesel. Bioresour Technol 2011; 102:2590-2594. [PMID: 21035329 DOI: 10.1016/j.biortech.2010.10.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 09/29/2010] [Accepted: 10/02/2010] [Indexed: 05/30/2023]
Abstract
One of the main drawbacks of the use of biodiesel is its bad behavior at low temperatures. In this work, we show that it is possible to take profit of the presence of free fatty acids in the starting materials used for biodiesel production (i.e. reused oils) by synthesizing additives able to improve cold flow properties. The synthesis of fatty acid derivatives have been successfully carried out by esterification of stearic, oleic and linoleic acids with bulky linear and cyclic alcohols and by epoxidation of methyl oleate and subsequent ring-opening reaction with the same alcohols. The study of crystallization patterns of pure derivatives by DSC and optical microscopy revealed the improvement of cold properties of biodiesel. Blends of biodiesel with up to 5% of some of these compounds allowed a decrease of CFPP (Cold Filter Pour Point). Both observations reveal the utility of these compounds as cheap and renewable additives.
Collapse
Affiliation(s)
- M De Torres
- Departamento de Química Orgánica, Universidad de Zaragoza and IUCH, Universidad de Zaragoza, Zaragoza, Spain
| | | | | | | |
Collapse
|
7
|
Cativiela C, Diaz De Villegas MD, García JI, Mayoral JA, Melendez E. Determination of the Enantiomeric Purity by 1h NMR with Eu(tfc)3 of β-Hetarylalanine Derivatives. Correlation Of the Enantiomeric Shift Difference with Absolute Configuration. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19840930609] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
8
|
Burguete MI, Cornejo A, García-Verdugo E, Gil MJ, Luis SV, Mayoral JA, Martínez-Merino V, Sokolova M. Pybox Monolithic Miniflow Reactors for Continuous Asymmetric Cyclopropanation Reaction under Conventional and Supercritical Conditions. J Org Chem 2007; 72:4344-50. [PMID: 17500566 DOI: 10.1021/jo070119r] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Supported catalysts having pybox chiral moieties were prepared as macroporous monolithic miniflow systems. These catalysts are based on styrene-divinylbenzene polymeric backbones having different compositions and pybox chiral moieties. Their corresponding ruthenium complexes were tested for the continuous flow cyclopropanation reaction between styrene and ethyldiazoacetate (EDA) under conventional conditions and in supercritical carbon dioxide (scCO2). Ru-Pybox monolithic miniflow reactors not only provided a highly efficient and robust heterogeneous chiral catalyst but also allowed us to develop more environmental reaction conditions without sacrificing the global efficiency of the process.
Collapse
Affiliation(s)
- M I Burguete
- Department of Inorganic and Organic Chemistry, A.U. for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Burguete MI, Fraile JM, García-Verdugo E, Luis SV, Martínez-Merino V, Mayoral JA. Polymer-Supported Bis(oxazolines) and Related Systems: Toward New Heterogeneous Enantioselective Catalysts. Ind Eng Chem Res 2005. [DOI: 10.1021/ie0488288] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. I. Burguete
- Department of Inorganic and Organic Chemistry, AU for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain, Department of Organic and Physical Chemistry, ICMA, University of Zaragoza/CSIC, Zaragoza, Spain, and Department of Chemistry, UP of Navarra, Pamplona (Navarra), Spain
| | - J. M. Fraile
- Department of Inorganic and Organic Chemistry, AU for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain, Department of Organic and Physical Chemistry, ICMA, University of Zaragoza/CSIC, Zaragoza, Spain, and Department of Chemistry, UP of Navarra, Pamplona (Navarra), Spain
| | - E. García-Verdugo
- Department of Inorganic and Organic Chemistry, AU for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain, Department of Organic and Physical Chemistry, ICMA, University of Zaragoza/CSIC, Zaragoza, Spain, and Department of Chemistry, UP of Navarra, Pamplona (Navarra), Spain
| | - S. V. Luis
- Department of Inorganic and Organic Chemistry, AU for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain, Department of Organic and Physical Chemistry, ICMA, University of Zaragoza/CSIC, Zaragoza, Spain, and Department of Chemistry, UP of Navarra, Pamplona (Navarra), Spain
| | - V. Martínez-Merino
- Department of Inorganic and Organic Chemistry, AU for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain, Department of Organic and Physical Chemistry, ICMA, University of Zaragoza/CSIC, Zaragoza, Spain, and Department of Chemistry, UP of Navarra, Pamplona (Navarra), Spain
| | - J. A. Mayoral
- Department of Inorganic and Organic Chemistry, AU for Advanced Organic Materials, University Jaume I/CSIC, E-12071 Castellón, Spain, Department of Organic and Physical Chemistry, ICMA, University of Zaragoza/CSIC, Zaragoza, Spain, and Department of Chemistry, UP of Navarra, Pamplona (Navarra), Spain
| |
Collapse
|
10
|
García JI, Pires E, Cornejo A, Fraile JM, Gil MJ, Martínez-Merino V, Mayoral JA, Villalba I. An Efficient and General One-Pot Method for the Synthesis of Chiral Bis(oxazoline) and Pyridine Bis(oxazoline) Ligands. Synlett 2005. [DOI: 10.1055/s-2005-872672] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
11
|
Fraile JM, García JI, Lafuente G, Mayoral JA, Salvatella L. Bis(oxazoline)-copper complexes, immobilized by electrostatic interactions, as catalysts for enantioselective aziridination. ARKIVOC 2003. [DOI: 10.3998/ark.5550190.0005.409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
12
|
Burguete MI, Díez-Barra E, Fraile JM, García JI, García-Verdugo E, González R, Herrerías CI, Luis SV, Mayoral JA, Sanchez-Verdú P. Improvement of ligand economy controlled by polymer morphology: the case of polymer-supported bis(oxazoline) catalysts. Bioorg Med Chem Lett 2002; 12:1821-4. [PMID: 12086825 DOI: 10.1016/s0960-894x(02)00259-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A functionalized chiral bis(oxazoline) is used as a chiral monomer in polymerization reactions leading to homo- and copolymers of different morphology. Polymers with a high content of chiral monomer lead to enantioselectivities that are higher than those obtained with the soluble ligand, but the chiral ligand is not used in an optimal way. A hyperbranched polymer, obtained by using a hexavinyldendrimer as the cross-linker, leads to the same enantioselectivities with a more efficient use of the chiral ligand.
Collapse
Affiliation(s)
- M I Burguete
- Dep. Química Inorgánica y Orgánica, E.S.T.C.E., Universidad Jaume I, E-12080 Castellón, Spain
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Ruiz-Lopez MF, Assfeld X, Garcia JI, Mayoral JA, Salvatella L. Solvent effects on the mechanism and selectivities of asymmetric Diels-Alder reactions. J Am Chem Soc 2002. [DOI: 10.1021/ja00072a035] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
14
|
Burguete MI, Fraile JM, García JI, García-Verdugo E, Herrerías CI, Luis SV, Mayoral JA. Bis(oxazoline)copper complexes covalently bonded to insoluble support as catalysts in cyclopropanation reactions. J Org Chem 2001; 66:8893-901. [PMID: 11749620 DOI: 10.1021/jo0159338] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chiral bis(oxazolines) are readily dialkylated in the methylene bridge, opening the way to immobilization at that position, keeping the C(2) symmetry of the chiral ligand. Bis(oxazolines) functionalized with two allyl or vinylbenzyl groups are easily grafted onto mercaptopropylsilica. Another approach to immobilization is the polymerization of the ligands bearing vinylbenzyl groups to yield insoluble polymers. The Cu(OTf)(2) complexes of the immobilized ligands promote the enantioselective cyclopropanation reaction between styrene and ethyl diazoacetate. The results depend on the nature of the support and the method of immobilization. With regard to the type of solid, the best results, which are similar to or even better than those obtained with the corresponding dibenzylated homogeneous catalysts, are obtained with homopolymers. With regard to the bis(oxazoline), that bearing indan groups leads to good results both onto silica and polymers, whereas with the ligand bearing tert-butyl groups good enantioselectivities are only obtained with homopolymeric catalysts. Some of the heterogeneous catalysts can be easily recovered and reused, as much as five times, with the same yield and stereoselectivities.
Collapse
Affiliation(s)
- M I Burguete
- Departamento de Química Inorgánica y Orgánica, ESTCE, Universidad Jaume I, E-12080 Castellón, Spain
| | | | | | | | | | | | | |
Collapse
|
15
|
Fraile JM, García JI, Martínez-Merino V, Mayoral JA, Salvatella L. Theoretical (DFT) insights into the mechanism of copper-catalyzed cyclopropanation reactions. Implications for enantioselective catalysis. J Am Chem Soc 2001; 123:7616-25. [PMID: 11480983 DOI: 10.1021/ja003695c] [Citation(s) in RCA: 164] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mechanism of the copper(I)-catalyzed cyclopropanation reaction has been extensively investigated for a medium-size reaction model by means of B3LYP/6-31G(d) calculations. The starting ethylene complex of the N,N'-dimethylmalonaldiimine--copper (I) catalyst undergoes a ligand exchange with methyl diazoacetate to yield a reaction intermediate, which subsequently undergoes nitrogen extrusion to generate a copper--carbene complex. The cyclopropanation step takes place through a direct carbene insertion of the metal--carbene species to yield a catalyst--product complex, which can finally regenerate the starting complex. The stereochemical predictions of a more realistic model (by considering a chiral bis(oxazoline)--copper (I) catalyst) have been rationalized in terms of steric repulsions, showing good agreement with experimental data.
Collapse
Affiliation(s)
- J M Fraile
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
| | | | | | | | | |
Collapse
|
16
|
Abstract
A revision of the most typical examples used to illustrate the existence of secondary orbital interactions (SOI) has been achieved. However, our analysis indicates that no conclusive evidence can be obtained from these cases. All five examples proposed by Woodward and Hoffmann in The Conservation of Orbital Symmetry have been revisited. A combination of well-known mechanisms (such as solvent effects, steric interactions, hydrogen bonds, electrostatic forces, and others) can be invoked instead to justify the endo/exo selectivity of Diels-Alder reactions.
Collapse
Affiliation(s)
- J I García
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
| | | | | |
Collapse
|
17
|
Altava B, Burguete MI, Fraile JM, García JI, Luis SV, Mayoral JA, Vicent MJ. How Important is the Inert Matrix of Supported Enantiomeric Catalysts? Reversal of Topicity with Two Polystyrene Backbones We would like to warmly thank Prof. J. M. J. Fréchet and Dr. F. Svec for technical advice. Financial support for this work was provided by the Spanish C.I.C.Y.T. (Project MAT96-1053) and Fundació Caixa Castelló-Bancaixa (P1B97-10). Angew Chem Int Ed Engl 2000; 39:1503-1506. [PMID: 10777656 DOI: 10.1002/(sici)1521-3773(20000417)39:8<1503::aid-anie1503>3.0.co;2-b] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- B Altava
- Departamento de Química Inorgánica y Orgánica E.S.T.C.E., Universitat Jaume I P.O. Box 224, 12080 Castellón (Spain)
| | | | | | | | | | | | | |
Collapse
|
18
|
Adrián F, Burguete MI, Fraile JM, García JI, García J, García-España E, Luis SV, Mayoral JA, Royo AJ, Sánchez MC. Homogeneous and Supported Copper Complexes of Cyclic and Open-Chain Polynitrogenated Ligands as Catalysts of Cyclopropanation Reactions. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199912)1999:12<2347::aid-ejic2347>3.0.co;2-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
19
|
Notario R, Abboud JLM, Cativiela C, García JI, Herreros M, Homan H, Mayoral JA, Salvatella L. Dramatic Medium Effects on Reactivity. The Ionization Sites of Pyrrole and Indole Carboxylic Acids. J Am Chem Soc 1998. [DOI: 10.1021/ja982424n] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- R. Notario
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - J.-L. M. Abboud
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - C. Cativiela
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - J. I. García
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - M. Herreros
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - H. Homan
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - J. A. Mayoral
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| | - L. Salvatella
- Contribution from the Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, E-28006 Madrid, Spain, Instituto de Ciencia de los Materiales de Aragón, CSIC, and Departamento de Química Orgánica, Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Laboratoire de Chimie Théorique, Unité Mixte de Recherche CNRS-UHP 7565, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy, France
| |
Collapse
|
20
|
Abstract
Intake of soyfoods containing isoflavonoids is related to positive effects on heart and kidney diseases. Urinary equol, a potent inhibitor of Na+-K+-2Cl- cotransport, originates from the metabolism of daidzein by intestinal bacteria. Loop diuretics (eg, furosemide), acting through inhibition of Na+-K+-2Cl- cotransport, are used to maintain adequate blood volume. In the present work, we compare isoflavonoids' inhibition of cotransport and effects on the function and hemodynamics of isolated perfused rat kidneys with those of furosemide. Equol [IC50 (half-maximal inhibitory concentration): 23.6 +/- 3.6 micromol/L], genistein (IC50: 34.8 +/- 2.6 micromol/L), and daidzein (IC50: 140.0 +/- 24 micromol/L) inhibited bumetanide-sensitive rubidium uptake in LLC-PK1 cells. The IC50 of equol and genistein was close to that of furosemide (IC50: 10.3 +/- 2.7 micromol/L). Furosemide, equol, and genistein stimulated water, sodium, and potassium excretion by isolated rat kidneys in the same temporal pattern. None of the isoflavonoids significantly increased the glomerular filtration rate, but genistein induced significant vasorelaxation. We conclude that isoflavonoids exhibit biological activities of furosemide in vitro, at concentrations similar to those reported for other in vitro effects. More research is needed to evaluate the participation of cotransport inhibition by isoflavonoids in the healthful effects claimed for soy intake.
Collapse
Affiliation(s)
- R M Martínez
- Department of Pharmacology and Physiology, Faculty of Medicine, University of Zaragoza, Spain
| | | | | | | | | |
Collapse
|
21
|
García JI, Martínez-Merino V, Mayoral JA. Quantum Chemical Insights into the Mechanism of the TADDOL−TiCl2 Catalyzed Diels−Alder Reactions. J Org Chem 1998. [DOI: 10.1021/jo972174d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. I. García
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, Universidad de Zaragoza-C.S.I.C., E−50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E−31006 Pamplona, Spain
| | - V. Martínez-Merino
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, Universidad de Zaragoza-C.S.I.C., E−50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E−31006 Pamplona, Spain
| | - J. A. Mayoral
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, Universidad de Zaragoza-C.S.I.C., E−50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E−31006 Pamplona, Spain
| |
Collapse
|
22
|
Abe T, Abboud JLM, Belio F, Bosch E, Garcia JI, Mayoral JA, Notario R, Ortega J, Ros�s M. Empirical treatment of solvent-solute interactions: medium effects on the electronic absorption spectrum of ?-carotene. J PHYS ORG CHEM 1998. [DOI: 10.1002/(sici)1099-1395(199803)11:3<193::aid-poc989>3.0.co;2-u] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
23
|
García JI, Martínez-Merino V, Mayoral JA, Salvatella L. Density Functional Theory Study of a Lewis Acid Catalyzed Diels−Alder Reaction. The Butadiene + Acrolein Paradigm. J Am Chem Soc 1998. [DOI: 10.1021/ja9722279] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. I. García
- Contribution from the Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, C.S.I.C.-Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E-31006 Pamplona, Spain
| | - V. Martínez-Merino
- Contribution from the Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, C.S.I.C.-Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E-31006 Pamplona, Spain
| | - J. A. Mayoral
- Contribution from the Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, C.S.I.C.-Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E-31006 Pamplona, Spain
| | - L. Salvatella
- Contribution from the Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, C.S.I.C.-Universidad de Zaragoza, E-50009 Zaragoza, Spain, and Departamento de Química Aplicada, Universidad Pública de Navarra, E-31006 Pamplona, Spain
| |
Collapse
|
24
|
Abstract
The urinary isoflavonoid genistein inhibits membrane Na-K-Cl cotransporters at similar concentrations as furosemide, but the significance of this action is unknown. Genistein was therefore investigated in rats for its potential salidiuretic actions. In the isolated, perfused rat kidney, genistein induced a maximal salidiuretic action similar to that of furosemide but was 3 to 5 times less potent than furosemide in terms of active doses (natriuresis EC50, 237+/-92 versus 56+/-20 micromol/L for genistein and furosemide, respectively). Genistein and furosemide had no additive salidiuretic actions. Genistein had no significant effect on glomerular filtration rate but was able to significantly reduce renal vascular resistance with respect to vehicle isolated perfused kidney. Indomethacin (10 micromol/L), a blocker of prostaglandin biosynthesis, reduced salidiuresis and renal vasorelaxation by genistein. Subcutaneous genistein (15 mg/kg) induced a statistically significant increase in diuresis and natriuresis with respect to vehicle during the first 6 hours of administration in rats. In conclusion, genistein compares well with furosemide in vitro for its salidiuretic profile and potency in the isolated perfused rat kidney and is also natriuretic by the subcutaneous route in the rat. Further studies are required to investigate potential natriuretic and perhaps hypotensive actions of dietary genistein.
Collapse
Affiliation(s)
- I Giménez
- Physiology and Pharmacology, School of Medicine, University of Zaragoza, Spain
| | | | | | | | | | | |
Collapse
|
25
|
Abstract
BACKGROUND The urinary isoflavonoid equol inhibits membrane Na-K-Cl cotransporters at similar concentrations to those at which furosemide inhibits them, but the significance of this action is not known. OBJECTIVE To investigate the potential salidiuretic and vascular actions of equol in the rat. METHODS Renal functioning was assessed in vitro in the isolated perfused kidney and in vivo in conscious rats. The vascular contractility of isolated aorta was assessed. RESULTS In the isolated perfused kidney equol was concentrated 50- to 70-fold in the urinary fluid, it was 3-4 times less potent than furosemide at increasing diuresis, natriuresis and kaliuresis (the difference was due to its higher protein-binding affinity), and it induced a modest but significant increase in glomerular filtration rate. In vivo, orally administered equol was a modest natriuretic agent, about 8-fold less potent than orally administered furosemide (in molar terms). In isolated aortic rings precontracted by administration of phenylephrine, administration of equol relaxed the contracted aorta at 10-fold lower concentrations (concentration for half-maximal activity 58.9 +/- 16 micromol/l, n = 3) than did furosemide (concentration for half-maximal activity 633 +/- 145 micromol/l, n = 3). CONCLUSIONS Equol is a modest natriuretic and vasorelaxant agent in the rat. Further studies are required in order to investigate the potential natriuretic and perhaps hypotensive actions of dietary equol precursors (daidzein).
Collapse
Affiliation(s)
- I Gimenez
- Department of Physiology and Pharmacology, Faculty of Medicine, Zaragoza, Spain
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Alda JO, Mayoral JA, Lou M, Gimenez I, Martinez RM, Garay RP. Purification and chemical characterization of a potent inhibitor of the Na-K-Cl cotransport system in rat urine. Biochem Biophys Res Commun 1996; 221:279-85. [PMID: 8619846 DOI: 10.1006/bbrc.1996.0586] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A potent inhibitor of the Na-K-Cl cotransport system was purified from urines of salt-loaded rats. Mass spectroscopy revealed a molecular mass of 242 Da. Nuclear magnetic resonance showed a spectrum identical to that of 3,4-dihydro-3-(4-hydroxyphenyl)-2H-1-benzopyran-7-ol (an "estrogen-like" isoflavonoid: equol). This compound inhibited cotransport fluxes at similar concentrations (IC50=16-24 microM) as furosemide (IC50 approximately 10 microM). Cotransport inhibitory activity of urines from rats drinking tap water was fully explained by urinary equol concentrations (approximately 27 microM, measured by high-performance liquid chromatography). Slat-loading increased urinary equol excretion, but not sufficiently high to fully explain the very important increase in cotransport inhibitory potency. We conclude that: (i) under basal conditions urinary equol can regulate Na-K-Cl cotransport activity in the kidney and (ii) salt-loading should evoke the appearance of other cotransport inhibitors.
Collapse
Affiliation(s)
- J O Alda
- Physiology and Pharmacology, School of Medicine, University of Zaragoza, Spain
| | | | | | | | | | | |
Collapse
|
27
|
Fraile JM, García JI, Mayoral JA. Cyclopropanation reactions catalysed by copper(II)-exchanged clays and zeolites. Influence of the catalyst on the selectivity. Chem Commun (Camb) 1996. [DOI: 10.1039/cc9960001319] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
28
|
|
29
|
Garc�a JI, Mayoral JA, Pires E, Brown DR, Massam J. Comparison of AlEt2Cl and ZnCl2 supported on silica gel as catalysts of Diels-Alder reactions. Influence of the nature of the dienophile. Catal Letters 1996. [DOI: 10.1007/bf00807764] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
30
|
Fraile JM, García JI, Mayoral JA, Tarnai T, Alonso PJ. Calcined and silylated K10 montmorillonites as catalysts of pericyclic reactions of trans-anethole. Chem Commun (Camb) 1996. [DOI: 10.1039/cc9960001981] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
31
|
|
32
|
Assfeld X, Ruiz-López MF, García JI, Mayoral JA, Salvatella L. Importance of electronic and nuclear polarization energy on diastereofacial selectivity of Diels–Alder reactions in aqueous solution. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/c39950001371] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
33
|
Cativiela C, Garcia JI, Mayoral JA, Royo AJ, Salvatella L, Assfeld X, Ruiz-Lopez MF. Experimental and theoretical study of the influence of the solvent on asymmetric diels?alder reactions. J PHYS ORG CHEM 1992. [DOI: 10.1002/poc.610050503] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
34
|
|
35
|
Curcuruto O, Favrctto D, Traldi P, Ajo D, Cativiela C, Mayoral JA, Lorez MP, Fraile JM, Garcia JI. Mass spectrometry in stereochemical problems. 6 — The case of mono and di-substituted norbornanes. ACTA ACUST UNITED AC 1991. [DOI: 10.1002/oms.1210261112] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
36
|
Cativiela C, Garcia JI, Mayoral JA, Avenoza A, Peregrina JM, Roy MA. Development of a model to explain the influence of the solvent on the rate and selectivity of diels-alder reactions. J PHYS ORG CHEM 1991. [DOI: 10.1002/poc.610040108] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
37
|
Cativiela C, Fraile JM, Mayoral JA. Ethyl 2-(Diphenylmethyleneamino)acrylate as a Dienophile in the Synthesis of Alicyclic α-Amino Acids. BCSJ 1990. [DOI: 10.1246/bcsj.63.2456] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
38
|
Curcuruto O, Traldi P, Cativiela C, De Villegas MDD, Garcia JI, Mayoral JA, Ajò D. Electron impact mass spectrometry and collisional spectroscopy in the structural characterization of 4-benzylidene and 4-phenylethylidene-2-phenyl-5(4H)-oxazolones. J Heterocycl Chem 1990. [DOI: 10.1002/jhet.5570270558] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
39
|
Cativiela C, Mayoral JA, Avenoza A, Gonzalez M, Roy MA. 5(4H)-Oxazolones as Dienophiles in the Synthesis of 2-Amino-2-bicycloalkanecarboxylic Acids. SYNTHESIS-STUTTGART 1990. [DOI: 10.1055/s-1990-27106] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
40
|
Mayoral JA, Cativiela C, Lopez MP, Aj� D, Zuane F. Synthesis and UV photoelectron investigation of the ?peptide units? of ?,?-dehydroamino acids. ACTA ACUST UNITED AC 1989. [DOI: 10.1007/bf01160881] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
41
|
|
42
|
Bueno MP, Cativiela C, Finol C, Mayoral JA, Jaime C. Diels–Alder reactions of methyl-N-acyl-α,β-dehydroalaninates with cyclopentadiene. CAN J CHEM 1987. [DOI: 10.1139/v87-365] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A study has been made of the Diels–Alder reaction of methyl-N-acetyl (and benzoyl)-α,β-dehydroalaninates with cyclopentadiene. In the reaction of methyl-N-acetyl-α,β-dehydroalaninate total conversion is obtained under several conditions, while the N-benzoyl derivative shows a lower reactivity. The stereoselectivity of the reaction is determined by 1H nuclear magnetic resonance spectroscopy. Perturbation MO calculations, using wave functions generated by the MNDO method, are used to rationalize the relative reactivity of the dienophiles and the stereoselectivity observed.
Collapse
|
43
|
Cativiela C, Diaz De Villegas MD, Mayoral JA, Melendez E. Synthesis and Stereospecific Ring Opening of the (Z/E)-Isomers of 2-Methyl(Phenyl)-4-(thienylmethylene)-5(4H)-oxazolones. SYNTHESIS-STUTTGART 1983. [DOI: 10.1055/s-1983-30556] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
44
|
Cativiela C, Mayoral JA, Melendez E, Usón R, Oro LA, Pinillos MT. Asymmetric hydrogenation of tryptophan precursors catalyzed by rhodium-DIOP complexes. ACTA ACUST UNITED AC 1982. [DOI: 10.1007/bf02064794] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|