Studies on molecular properties prediction and histamine H3 receptor affinities of novel ligands with uracil-based motifs
作者:Luca Lipani、Dalibor Odadzic、Lilia Weizel、Johannes-Stephan Schwed、Bassem Sadek、Holger Stark
DOI:10.1016/j.ejmech.2014.09.011
日期:2014.10
The histamine H-3 receptor (H3R) plays a role in cognitive and memory processes and is involved in different neurological disorders, including Alzheimer's disease, schizophrenia, and narcolepsy. Therefore, several hH(3)R antagonists/inverse agonists entered clinical phases for a broad spectrum of mainly centrally occurring diseases. However, many other promising candidates failed due to their pharmacokinetic profile, mostly because of their strong lipophilicity accompanied with low solubility. Analysis of previous potential H3R selective antagonists/inverse agonists, e.g. pitolisant, revealed promising results concerning physicochemical properties and drug-likeness. Herein, a series of new hH(3)R ligands 8-20 consisting of piperidin-1-yl or piperidin-1-yl-propoxyphenyl coupled to different uracil, thymine, and 5,6-dimethyluracil related moieties, were synthesized, evaluated on their binding properties at the hH(3)R and the estimation of different physicochemical and drug-likeness properties. Due to the coupling to various positions at pyrimidine-2,4-(1H,3H)-dione, affinity at hH(3)Rs and drug-likeness parameters have been improved. For instance, compound 9 showed in addition to high affinity at the hH(3)R (pK(i) (hH(3)R) = 8.14) clog S, clog P, LE, LipE, and drug-likeness score values of -4.36, 3.47, 0.34, 4.63, and 1.54, respectively. Also, the methyl substituted analog 17 (pK(i); (hH(3)R) = 8.15) revealed LE, LipE and drug-likeness score values of -3.29, 2.47, 0.49, 5.52, and 1.76, respectively. (C) 2014 Elsevier Masson SAS. All rights reserved.