Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (3): 455-460.doi: 10.1007/s40242-014-4012-3

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Theoretical Calculations of the pKa Values of 1-Aryl-4-propylpiperazine Drugs in Aqueous Solution

FAN Linlin1, YANG Xin1, TIAN Zhiyue1, ZHAO Xuekun1, LI Ruixiang1, XUE Ying1,2   

  1. 1. Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
    2. State Key Laboratory of Biotherapy, Sichuan University, Chengdu 610041, P. R. China
  • Received:2014-01-09 Revised:2014-04-03 Online:2014-06-01 Published:2014-04-14
  • Contact: XUE Ying E-mail:yxue@scu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21173151, J1103315) and the National Basic Research Program of China(No.2011CB201202).

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 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 pKa values was also observed.

Key words: 1-Arylpiperazine, Aqueous pKa, B3LYP, B3P86, Conductor-like polarized continuum model(CPCM)