Effect of Modifications of the Alkylpiperazine Moiety of Trazodone on 5HT2A and α1 Receptor Binding Affinity
摘要:
A series of triazolopyridine derivatives (compounds 2a-I) were synthesized in order to-explore the effect of modifications of the alkylpiperazine moiety of trazodone (fragment A) on binding affinity for 5HT(2A) and alpha(1) receptors. All of the synthesized compounds show a decrease of affinity for both 5HT(2A) and alpha(1) receptors, as compared to trazodone, with the exception of compounds 2b,c which bear a methyl group in an alpha position to the aliphatic nitrogen atom N-1. These compounds showed a decrease of affinity only for the alpha(1) receptor. The stereochemical influence of the piperazine moiety of compound 2c was also evaluated. Enantiomer (S)-2c showed the most significant differences between 5HT(2A) and alpha(1) receptor affinity (IC50 values) and among the corresponding functional properties (pA(2) values). Since (S)-2c cannot generate the metabolite 4-(3-chlorophenyl)piperazine this product was selected for further pharmacological studies.
药物降解产物是一种会影响药物安全性的药物杂质。曲唑酮(TZD)是一种抗抑郁药,按照ICH嵌入式指南中的预测药物降解产物的规定,会被迫降解。它在酸性水解,过氧化物诱导的氧化中以及在暴露于日光下会发生降解,并导致形成十种降解产物(DPs)。开发了UHPLC方法,使用Acquity UPLC CSH C 18色谱柱的固定相(100×2.1 mm,1.7μm)和溶剂-A的流动相(10 mM醋酸铵,pH 8.5)分离TZD及其DP。溶剂B(甲醇)的流速为0.25 mL min -1在梯度洗脱中。将该方法转移到四极杆飞行时间串联质谱仪(QTOF-MS / MS)上以鉴定DP。非常有趣的是,在光解降解条件下发现了四个二聚体DP,并且发现它们是异构体。使用制备型HPLC分离主要异构体(DP-10),并使用质子和碳NMR鉴定其结构。三N还观察到氧化DPs,并通过大气压化学电离质谱法(APCI-MS)鉴定了N