Theoretical calculations of the pK _a values of 1-aryl-4-propylpiperazine drugs in aqueous solution

Abstract

Theoretical calculations were carried out to predict the aqueous-phase acidities of a series of drug 1-phenyl-4-propylpiperazine and its derivatives. The performances of the density functional theory(DFT) methods B3LYP and B3P86, solvation models[the polarized continuum model(PCM) and the conductor-like polarized continuum model(CPCM)], and the basis set effect were tested. A comparison between the theoretical and experimental pK _a values for para-substituted 1-phenyl-4-propylpiperazines reveals that the accuracy of B3LYP is better than that of B3P86, and the basis set 6-31++G(d,p) and the CPCM model are suitable for calculating pK _a values of the substituted 1-phenyl-4-propylpiperazine. For the investigated compounds, a reasonable agreement between the experimental and calculated pK _a values was also observed.

Keywords

1-Arylpiperazine / Aqueous pK _a / B3LYP / B3P86 / Conductor-like polarized continuum model(CPCM)

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