Stereochemistry of Complex Marine Natural Products by Quantum Mechanical Calculations of NMR Chemical Shifts: Solvent and Conformational Effects on Okadaic Acid

Autor: Humberto J. Domínguez, Guillermo D. Crespín, Adrián J. Santiago-Benítez, José A. Gavín, Manuel Norte, José J. Fernández, Antonio Hernández Daranas
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Marine Drugs, Vol 12, Iss 1, Pp 176-192 (2014)
Druh dokumentu: article
ISSN: 1660-3397
DOI: 10.3390/md12010176
Popis: Marine organisms are an increasingly important source of novel metabolites, some of which have already inspired or become new drugs. In addition, many of these molecules show a high degree of novelty from a structural and/or pharmacological point of view. Structure determination is generally achieved by the use of a variety of spectroscopic methods, among which NMR (nuclear magnetic resonance) plays a major role and determination of the stereochemical relationships within every new molecule is generally the most challenging part in structural determination. In this communication, we have chosen okadaic acid as a model compound to perform a computational chemistry study to predict 1H and 13C NMR chemical shifts. The effect of two different solvents and conformation on the ability of DFT (density functional theory) calculations to predict the correct stereoisomer has been studied.
Databáze: Directory of Open Access Journals