Determinación de la configuración absoluta de esteroides mediante espectroscopía de dicroísmo circular vibracional y cálculos DFT: Deshidroepiandrosterona (DHEA)
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2022-07-14
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Jaén: Universidad de Jaén
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[ES] a espectroscopía de dicroísmo circular vibracional, VCD, en combinación con los cálculos químico-cuánticos DFT son una herramienta muy potente para la determinación de la configuración absoluta y conformaciones de moléculas quirales. En el presente estudio se ha diseñado e implementado una estrategia de trabajo que permita corroborar la configuración absoluta de una muestra de deshidroepiandrosterona (DHEA) haciendo uso de las técnicas mencionadas. Para este fin se ha realizado un análisis profundo de las conformaciones posibles de esta molécula estudiando sus fuentes de
flexibilidad y la posibilidad de la existencia de agregados moleculares. A su vez, se ha comprobado la validez y preferencia del empleo de diferentes funcionales DFT y conjuntos de base para la optimización de la estructura y obtención de los espectros vibracionales de la especie. Se concluye que la estrategia propuesta permite alcanzar los objetivos planteados.
[EN] Vibrational circular dichroism spectroscopy, VCD, combined with quantum chemistry calculations is a powerful tool for the elucidation of the absolute configuration and conformations of a chiral molecule. In the present study, a working method involving the aforementioned techniques has been designed and implemented to corroborate the absolute configuration of a sample of dehydroepiandrosterone (DHEA) . For this purpose, an exhaustive analysis of the conformational landscape of this molecule has been carried out, analyzing all possible sources of molecular flexibility and the possible occurrence of H-bonded aggregates. Simultaneously, the reliability of different DFT functionals and basis sets has been tested. It has been concluded that the proposed strategy allows achieving the proposed objectives.
[EN] Vibrational circular dichroism spectroscopy, VCD, combined with quantum chemistry calculations is a powerful tool for the elucidation of the absolute configuration and conformations of a chiral molecule. In the present study, a working method involving the aforementioned techniques has been designed and implemented to corroborate the absolute configuration of a sample of dehydroepiandrosterone (DHEA) . For this purpose, an exhaustive analysis of the conformational landscape of this molecule has been carried out, analyzing all possible sources of molecular flexibility and the possible occurrence of H-bonded aggregates. Simultaneously, the reliability of different DFT functionals and basis sets has been tested. It has been concluded that the proposed strategy allows achieving the proposed objectives.