Theoretical study via DFT for prediction of 13C and 1H NMR data of two diterpenoids derived from the root of Salvia grandifolia (Short communication)

Renato Araújo da Costa, Sebastião Gomes Silva, Silvana de Oliveira Silva, Jorddy Neves Cruz, Wanessa Almeida da Costa, Luciane do Socorro Nunes dos Santos Brasil, Rai Campos Silva, Cleydson Breno Rodrigues Santos, Cláudio Nahum Alves, Davi do Socorro Barros Brasil


The DFT method has become a promising alternative in the support of traditional NMR experimental techniques, comparing experimental data with theoretical data, thereby achieving accurate and satisfactory results. In the present study, the experimental data of two diterpenes were compared to the theoretical data obtained by the GIAO method, applying DFT at the B3LYP/cc-pVDZ and B3PW91/DGDZVP levels to verify the degree of correlation, significance and predictability of the models obtained with the purpose of proving which of the computational methods is the most efficient for this class of substances. The theoretical NMR values obtained at B3LYP/cc-pVDZ were the more satisfactory, showing better linear correlations, presenting greater degrees of adjustments, sig­nificance and predictability compared to the B3PW91/DGDZVP method. Thus, these values were used to define Hα and Hβ 1, 2, 3, 6 and 7 for diterpene 1 and 1, 2, 3, 6 and 7 for diterpene 2, which was not possible using experimental data. This showed that the quantum method used could help in the structural elucid­ation of natural products.


statistical analysis; B3LYP/cc-pVDZ; linear regression


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