B3LYP Study of 3-hydroxynaphthalene-2-carboxanilide para-derivatives

Abstract

A systematic DFT investigation of 3-hydroxy-N-phenylnaphthalene-2-carboxamide and its sixteen para-derivatives is presented. The structural analysis showed that the energetically preferred conformation of all derivatives is practically planar and it is stabilised via intramolecular hydrogen bonds occurring between (C)O ... H(3)O atomic pairs. The quantum chemically evaluated partition coefficients logarithms correlate well with Quantitative Structure-Activity Relationship models as well as with experimentally determined isocratic retention factors logarithm. Theoretical gas-phase proton affinities of amido and hydroxyl group together with selected partial atomic charges reflect the terminal phenyl substitution effect. These quantities are linearly dependent on the in vitro activity against the Mycobacterium Kansasii. Obtained linear correlation functions based on quantum chemically evaluated microscopic properties and selected experimental data may serve as the effective tool in modern drug design for the description of substitution effect.