像亲脂性一样,pKa已被研究了多年,具有坚实的研究基础和高质量的测量数据,数据库资源可提供多种已知化合物的pKa实验数据。在此基础上,研究者可以通过软件准确地预测化合物的pKa值。ACD/Percepta软件包含了约16000个化合物的pKa实验数据,超过3万个pKa实验值供用户查询,如图10所示。图10 ACD/Percepta软件的pKa数据库 ACD/Percepta的pKa预测功能提供了Classic和GALAS两种算法,都可提供分子中每个电离中心的pKa值、结构归属以及图表动态可视化界面,如图11、12所示。图11 ACD/Percepta pKa Classic算法界面 图12 ACD/Percepta pKa GALAS算法界面 ACD/Percepta的pKa预测准确性也是得到了业界的一致认可。Wyeth公司研究院在药物发现过程中合成了98个不同结构的化合物,实测了它们的pKa值,并采用ACD/pKa软件(Percepta早期版本)进行了预测。两者相关性的R2为0.9022,这在软件预测中是非常好的结果。 图13 GLpKa技术测得的pKa与ACD/pKa软件计算结果相关性分析 参考文献1. Martin,A.(1993). Physical pharmacy (4th ed). Philadelphia: Lea & Febiger.2. Wei, Z-Y.,et al.(2000).N,N-Diethyl-4-(phenylpiperidin-4-ylidenemethylbenzamide: A novel,exceptionally selective,potent d-opioid receptoragonist with oral bioavailability and its analogues.Journal of Medicinal Chemisry.43.3895-3905.3. Miller, G.H, ,et al.(1972). Sulfonamide structure-activity relation in a cell-freesystem. Correlation of inhibition of folate synthesis with antibacterial activity and physicochemical parameters. Journal of Medicinal Chemistry, 15, 700-706.4. Clark.D.E.(2003).In silico prediction of bood-brain barrier permeation.Drug Discovery Tday.8.927-933. 5. Roda,A.,et al.(1996).Synthesis andphysicochemical, biological,and pharmacological properties of new bile acids amidated with cyclic amino acids.Journal of Medicinal Chemisry, 39.2270-2276.6. Chen,P.,et al.(2004).ImidazoquinoxalineSre-family kinase p56LCK inhibitors: SAR,QSAR,and the discovery of (S)-N-(2-Chloro-6-methylphenyl)-2-(3-methyl-1-piperazinylimidazo-[1.5-alpyrido[3.2-e]pyrazin-6-amine(BMS-279700)as a potent and orally active inhibitor with excellent in vivo antinflammatory activity. Journal of Medicinal Chemistry,47, 4517-4529.7. Wohnsland.F.& Fler.B.(2001).High-throughput permeability pH profile and high-throughput alkane/waterlog P with artificial membranes.Journal of Medicinal Chemisry,44,923-930.8. Avdeef,A.(2001). Physicochemical profling(solubility. permeability and charge state). Current Topics in Medicinal Chemisiry.1,27-351.9. 类药性质:概念、结构设计与方法 从ADME到安全性优化,2008,钟大放等译.10. Drug-Like Properties:Concepts, Structure Design and Methods from ADME to Toxicity Optimization. Second Edition,2016.Li Di and Edward H. Kernsn.