摘要
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 conti- nuum model（CPCM）], and the basis set effect were tested. A comparison between the theoretical and experimental pKa 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 pKa values of the substituted 1-phenyl-4-propylpiperazine. For the investigated compounds, a reasonable agreement between the experimental and calculated oKo values was also observed.
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 conti- nuum model（CPCM）], and the basis set effect were tested. A comparison between the theoretical and experimental pKa 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 pKa values of the substituted 1-phenyl-4-propylpiperazine. For the investigated compounds, a reasonable agreement between the experimental and calculated oKo values was also observed.
基金
Supported by the National Natural Science Foundation of China（Nos.21173151, J1103315） and the National Basic Research Program of China（No.2011CB201202）.
