Prof. Olga García Mancheño, Organisch-Chemisches Institut/Universität Münster, Germany
Innovative Organocatalysts’ Design for Photoredox & Anion-Binding Catalysis
Aula de Grados, Edificio de Farmacia, UAH. April 19th, 12.00.
Electrochemically driven one-pot oxidative conversion of arylhydrazines into aromatic iodides.
Palabras clave: Environmentally friendly transformation; Aryl iodides; Iodide redox mediator; Arylhydrazines; Anodic oxidation; C-N bond cleavage; Electrografting
Resumen
The efficient metal-free electrosynthesis of 2,4-dinitrophenyl iodide is here reported starting from 2,4-dinitrophenylhydrazine. Surprisingly this dinitrated arylhydrazine minimizes, under the applied experimental conditions, any anodic multilayered film formation. This sustainable iodide-mediated oxidative dehydrazination enables coupling reaction of electrogenerated iodine with aryl radicals from electron-deficient arylhydrazines employing electricity as the driving force and an inexpensive halogen source. A mechanistic proposal explaining the formation of aryl iodides is presented and discussed.
Alberto Ortiz et al.
Clin Kidney J. 2022, 15, 372
DOI: 10.1093/ckj/sfab170
Alberto Ortiz et al.
Nefrología 2022, 42, 65
DOI: 10.1016/j.nefro.2021.09.004
RICORS2040: the need for collaborative research in chronic kidney disease.
Keywords: COVID-19; accelerated ageing; burden of disease; chronic kidney disease; decade of the kidney; kidney failure; kidney transplantation; research funding
Abstract
Chronic kidney disease (CKD) is a silent and poorly known killer. The current concept of CKD is relatively young and uptake by the public, physicians and health authorities is not widespread. Physicians still confuse CKD with chronic kidney insufficiency or failure. For the wider public and health authorities, CKD evokes kidney replacement therapy (KRT). In Spain, the prevalence of KRT is 0.13%. Thus health authorities may consider CKD a non-issue: very few persons eventually need KRT and, for those in whom kidneys fail, the problem is 'solved' by dialysis or kidney transplantation. However, KRT is the tip of the iceberg in the burden of CKD. The main burden of CKD is accelerated ageing and premature death. The cut-off points for kidney function and kidney damage indexes that define CKD also mark an increased risk for all-cause premature death. CKD is the most prevalent risk factor for lethal coronavirus disease 2019 (COVID-19) and the factor that most increases the risk of death in COVID-19, after old age. Men and women undergoing KRT still have an annual mortality that is 10- to 100-fold higher than similar-age peers, and life expectancy is shortened by ~40 years for young persons on dialysis and by 15 years for young persons with a functioning kidney graft. CKD is expected to become the fifth greatest global cause of death by 2040 and the second greatest cause of death in Spain before the end of the century, a time when one in four Spaniards will have CKD. However, by 2022, CKD will become the only top-15 global predicted cause of death that is not supported by a dedicated well-funded Centres for Biomedical Research (CIBER) network structure in Spain. Realizing the underestimation of the CKD burden of disease by health authorities, the Decade of the Kidney initiative for 2020-2030 was launched by the American Association of Kidney Patients and the European Kidney Health Alliance. Leading Spanish kidney researchers grouped in the kidney collaborative research network Red de Investigación Renal have now applied for the Redes de Investigación Cooperativa Orientadas a Resultados en Salud (RICORS) call for collaborative research in Spain with the support of the Spanish Society of Nephrology, Federación Nacional de Asociaciones para la Lucha Contra las Enfermedades del Riñón and ONT: RICORS2040 aims to prevent the dire predictions for the global 2040 burden of CKD from becoming true.
CKD: The burden of disease invisible to research funders.
Keywords: Accelerated aging; Burden of disease; COVID-19; Chronic kidney disease; Decade of the kidney; Kidney failure; Kidney transplantation; Research funding
Abstract
The uptake of the current concept of chronic kidney disease (CKD) by the public, physicians and health authorities is low. Physicians still mix up CKD with chronic kidney insufficiency or failure. In a recent manuscript, only 23% of participants in a cohort of persons with CKD had been diagnosed by their physicians as having CKD while 29% has a diagnosis of cancer and 82% had a diagnosis of hypertension. For the wider public and health authorities, CKD evokes kidney replacement therapy (KRT). In Spain, the prevalence of KRT is 0.13%. A prevalent view is that for those in whom kidneys fail, the problem is "solved" by dialysis or kidney transplantation. However, the main burden of CKD is accelerated aging and all-cause and cardiovascular premature death. CKD is the most prevalent risk factor for lethal COVID-19 and the factor that most increases the risk of death in COVID-19, after old age. Moreover, men and women undergoing KRT still have an annual mortality which is 10-100-fold higher than similar age peers, and life expectancy is shortened by around 40 years for young persons on dialysis and by 15 years for young persons with a functioning kidney graft. CKD is expected to become the fifth global cause of death by 2040 and the second cause of death in Spain before the end of the century, a time when 1 in 4 Spaniards will have CKD. However, by 2022, CKD will become the only top-15 global predicted cause of death that is not supported by a dedicated well-funded CIBER network research structure in Spain. Leading Spanish kidney researchers grouped in the kidney collaborative research network REDINREN have now applied for the RICORS call of collaborative research in Spain with the support of the Spanish Society of Nephrology, ALCER and ONT: RICORS2040 aims to prevent the dire predictions for the global 2040 burden of CKD from becoming true. However, only the highest level of research funding through the CIBER will allow to adequately address the issue before it is too late.
Noemi Salardón, Guillermo Otárola, Clara Mañas, Estíbaliz Merino, Belen Batanero*
J. Environ. Chem. Eng. 2022, in press, Open access
DOI: 10.1016/j.jece.2022.107486
| The efficient metal-free electrosynthesis of 2,4-dinitrophenyl iodide is here reported starting from 2,4-dinitrophenylhydrazine. Surprisingly this dinitrated arylhydrazine minimizes, under the applied experimental conditions, any anodic multilayered film formation. This sustainable iodide-mediated oxidative dehydrazination enables coupling reaction of electrogenerated iodine with aryl radicals from electron-deficient arylhydrazines employing electricity as the driving force and an inexpensive halogen source. A mechanistic proposal explaining the formation of aryl iodides is presented and discussed. |
Senior Research Fellow
Pyridazino-pyrrolo-quinoxalinium salts as highly potent and selective leishmanicidal agents targeting trypanothione reductase.
1. Departamento de Biología de Sistemas, Universidad de Alcalá, E-28805, Alcalá de Henares, Madrid, Spain. Electronic address:. 2. Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805, Alcalá de Henares, Madrid, Spain. 3. Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra, Colmenar Viejo, km. 9100, 28034, Madrid, Spain. 4. Instituto de Investigación Química Andrés Manuel del Río (IQAR), Universidad de Alcalá, 28805, Alcalá de Henares, Madrid, Spain. Electronic address:. 5. Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805, Alcalá de Henares, Madrid, Spain. Electronic address:. 6. Área de Farmacología, Departamento de Ciencias Biomédicas, Unidad Asociada al IQM-CSIC, Universidad de Alcalá, E-28805, Alcalá de Henares, Madrid, Spain. Electronic address:.
a. hector.lucio@edu.uah.es b. javier.garciamarin@uah.es c. sanchezalonsopatricia@gmail.com d. jcarlos.garcias@uah.es e. migueltoro83@gmail.com f. juanjose.vaquero@uah.es g. federico.gago@uah.es h. ramon.alajarin@uah.es i. antonio.jimenez@uah.es
Keywords: Enzyme inhibitor; Leishmania; Pyridazino%@5B2,3-a%@5Dpyrrolo%@5B2,1-c%@5Dquinoxalinium; Trypanothione disulfide reductase
Abstract
Fifteen pyridazino-pyrrolo-quinoxalinium salts were synthesized and tested for their antiprotozoal activity against Leishmania infantum amastigotes. Eleven of them turned out to be leishmanicidal, with EC(50) values in the nanomolar range, and displayed low toxicity against the human THP-1 cell line. Selectivity indices for these compounds range from 10 to more than 1000. Compounds 3b and 3f behave as potent inhibitors of the oxidoreductase activity of the essential enzyme trypanothione disulfide reductase (TryR). Interestingly, binding of 3f is not affected by high trypanothione concentrations, as revealed by the noncompetitive pattern of inhibition observed when tested in the presence of increasing concentrations of this substrate. Furthermore, when analyzed at varying NADPH concentrations, the characteristic pattern of hyperbolic uncompetitive inhibition supports the view that binding of NADPH to TryR is a prerequisite for inhibitor-protein association. Similar to other TryR uncompetitive inhibitors for NADPH, 3f is responsible for TryR-dependent reduction of cytochrome c in a reaction that is typically inhibited by superoxide dismutase.
orcid.org/0000-0003-0156-9082
