Molecules 2015, 20(9), 15643-15665; https://doi.org/10.3390/molecules200915643
Fluorination Effects on NOS Inhibitory Activity of Pyrazoles Related to Curcumin
Carla I. Nieto 1, María Pilar Cabildo 1, María Pilar Cornago 1, Dionisia Sanz 1, Rosa M. Claramunt 1, María Carmen Torralba 2,*
, María Rosario Torres 2, José Elguero 3, José A. García 4, Ana López 4 and Darío Acuña-Castroviejo 4,*
1
Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, Paseo Senda del Rey, 9, Madrid 28040, Spain
2
Departamento de Química Inorgánica I and CAI de Difracción de Rayos-X, Facultad de Ciencias Químicas, Universidad Complutense de Madrid (UCM), Madrid 28040, Spain
3
Instituto de Química Médica, Centro de Química Orgánica “Manuel Lora-Tamayo”, CSIC, Juan de la Cierva, 3, Madrid 28006, Spain
4
Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Avda. del Conocimiento s/n, Armilla, 18100 Granada, Spain
*
Authors to whom correspondence should be addressed.
Academic Editor: Wim Dehaen
Received: 6 July 2015 / Revised: 15 August 2015 / Accepted: 17 August 2015 / Published: 28 August 2015
(This article belongs to the Collection Heterocyclic Compounds)
Abstract
A series of new (E)-3(5)-[β-(aryl)-ethenyl]-5(3)-phenyl-1H-pyrazoles bearing fluorine atoms at different positions of the aryl group have been synthesized starting from the corresponding β-diketones. All compounds have been characterized by elemental analysis, DSC as well as NMR (1H, 13C, 19F and 15N) spectroscopy in solution and in solid state. Three structures have been solved by X-ray diffraction analysis, confirming the tautomeric forms detected by solid state NMR. The in vitro study of their inhibitory potency and selectivity on the activity of nNOS and eNOS (calcium-calmodulin dependent) as well as iNOS (calcium-calmodulin independent) isoenzymes is presented. A qualitative structure–activity analysis allowed the establishment of a correlation between the presence/ absence of different substituents with the inhibition data proving that fluorine groups enhance the biological activity. (E)-3(5)-[β-(3-Fluoro-4-hydroxyphenyl)-ethenyl]-5(3)-phenyl-1H-pyrazole (13), is the best inhibitor of iNOS, being also more selective towards the other two isoforms. View Full-TextKeywords:
NOS inhibitors; pyrazoles; tautomerism; fluorine derivatives; curcumin; crystallography; multinuclear NMR
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Nieto, C.I.; Cabildo, M.P.; Cornago, M.P.; Sanz, D.; Claramunt, R.M.; Torralba, M.C.; Torres, M.R.; Elguero, J.; García, J.A.; López, A.; Acuña-Castroviejo, D. Fluorination Effects on NOS Inhibitory Activity of Pyrazoles Related to Curcumin. Molecules 2015, 20, 15643-15665.
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