Elena Zaballos-Garcia
University of Valencia
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Publication
Featured researches published by Elena Zaballos-Garcia.
Tetrahedron | 2003
Luisa Testa; Mohamed Akssira; Elena Zaballos-Garcia; Pau Arroyo; Luis R. Domingo; José Sepúlveda-Arques
The regio and stereoselective transformation of trans 1,2,3-trisubstituted aziridines into trans oxazolidin-2-ones takes place in good yield. However, the cis configuration at C2 and C3 in monocyclic aziridines is a limiting factor for this transformation. Ab initio calculations show that while the ring-opening process assisted by iodide is regioselective, the subsequent ring-closure is responsible for the retention of the configuration at the trans oxazolidin-2-one. The larger energy found for the ring-closure process for the cis aziridines accounts for the non-formation of the cis oxazolidin-2-ones.
Tetrahedron | 1996
José Sepúlveda-Arques; Trinidad Armero‐Alarte; Alberto Acero-Alarcón; Elena Zaballos-Garcia; Belén Yruretagoyena Solesio; Jesús Ezquerra Carrera
N-Alkyl aziridines react stereoselectively with di-tert-butyl diearbonate and sodium iodide in acetone to give oxazolidin-2-ones in excellent yields.
Tetrahedron | 2000
Chakib Hajji; Mª Luisa Testa; Roberto de la Salud-Bea; Elena Zaballos-Garcia; Juan Server-Carrió; José Sepúlveda-Arques
Abstract Enantiomerically pure 4,5-disubstituted 3-methyltetrahydro-1,3-oxazines have been obtained by reaction of 3-methylamino-1,2-diols with dichloromethane by regioselective differentiation of hydroxyl groups.
Tetrahedron | 1997
Elena Zaballos-Garcia; M. Eugenia González-Rosende; J. Miquel Jordá-Gregori; José Sepúlveda-Arques; W. Brian Jennings; Donal O'Leary; Suzanne Twomey
Abstract 2-Formylthiophene and 3-formylindole react with diethyl azodicarboxylate to give simple products derived from reactions on the formyl group whereas 2-formylfuran reacts to give the unexpected bicyclic title compound. 1 H and 13 C NMR studies indicate that this compound undergoes a series of three dynamic conformational changes over the temperature range 50 to −90°C which are ascribed to slow rotation about the exocyclic carbamate bonds and hindered bridge inversion.
RSC Advances | 2016
Julie P. Vanegas; Elena Zaballos-Garcia; María González-Béjar; Pablo Londoño-Larrea; Julia Pérez-Prieto
Reduction of Au3+ in the presence of just adenosine 5′-monophosphate (AMP) and a zwitterionic organic chemical buffering agent, specifically 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES), combined with light exposure, gives rise to luminescent, water-soluble Au+ nanoclusters (Au+ NCs). The photoluminescence of these NCs is considerably enhanced by adding Y3+ or the chemically similar Yb3+ lanthanide that leads to Au+/Y3+ and Au+/Yb3+ NCs, respectively. These NCs are characterised by absorption (steady-state), photoluminescence (steady-state and time-resolved), and X-ray photoelectron spectroscopy.
RSC Advances | 2013
Salvador Pocoví-Martínez; Laura Francés-Soriano; Elena Zaballos-Garcia; J. C. Scaiano; María González-Béjar; Julia Pérez-Prieto
Gold nanoparticles capped with oleylamine can be effectively transferred from an organic solvent to water in the presence of an acetamidine surfactant by CO2 bubbling and then effectively reverted back to the organic phase by N2 bubbling.
Synthetic Communications | 2003
Chakib Hajji; Elena Zaballos-Garcia; José Sepúlveda-Arques
Abstract The chemoselective reaction of (2R, 3R)-3-methylamino-3-phenyl-1,2-propanediol 1 with dimethoxypropane and dichloromethane under different conditions are reported as useful preparative procedures, for the synthesis 1,3-oxazolidines and 1,3-dioxolanes.
Synthetic Communications | 2003
R. Mamouni; Mohamed Akssira; M. Aadil; A. Elhakmaoui; J. Lasri; Elena Zaballos-Garcia
Abstract Pyrido[3,2-d]pyrimidine-2,4-diones derivatives have been synthesized in good yields by two efficient synthetic routes, the first one through an hetero-cyclization on the ureas derivatives 3a–e under alkaline conditions, the second one by condensation of the isocyanate 2 with various arylalkylamines in pyridine.
Tetrahedron-asymmetry | 2001
Ma̱ Luisa Testa; Chakib Hajji; Elena Zaballos-Garcia; Ana Belén Garcı́a-Segovia; José Sepúlveda-Arques
Abstract A ring-opening reaction of N -methylaziridines with Boc 2 O/NaI has been applied to the asymmetric synthesis of pseudoephedrine. 3-Methylamino-3-phenyl-1,2-propanediol 1 , derived from (2 S ,3 S )-3-phenyloxiran-2-ylmethanol, was converted into the oxazolidin-2-one 4 , a precursor of pseudoephedrine. The reaction occurs with a stereospecific interchange of amino and alcohol functions.
Tetrahedron | 2002
Chakib Hajji; Mª Luisa Testa; Elena Zaballos-Garcia; Ramón J. Zaragozá; Juan Server-Carrió; José Sepúlveda-Arques
Abstract The reactivity of (2S,3S)-N1-methyl-2-hydroxy-3-methylamino-3-phenylpropanamide 1 , containing three nucleophilic centres has been studied against dihaloalkanes and aldehydes. Hexahydro-4-pyrimidinones or oxazolidines were obtained chemoselectively. Experimental results were explained by ‘ab initio’ calculations.