Synthesis and in vitro pharmacological evaluation of indolyl carboxylic amide analogues as D3 dopamine receptor selective ligands
作者:Zhude Tu、Shihong Li、Aixiao Li、Michelle Taylor、David Ho、Maninder Malik、Robert R. Luedtke、Robert H. Mach
DOI:10.1039/c3md00098b
日期:——
A series of substituted 1H-indolyl carboxylic acid amides that contain a N-(2-methoxyphenyl)piperazine or N-(2-fluoroethoxy)piperazine group were synthesized and their affinities for human dopamine D2, D3, and D4 receptors were determined. Two of these compounds, 14a and 14b, displayed high binding affinity at D3 (Ki = 0.18 and 0.4 nM, respectively), and selectivity for D3vs. D2 receptors (87-fold and 60-fold, respectively). These two compounds had low binding affinity at D4 receptors and σ receptor sites. The intrinsic activity of these compounds at D2 and D3 receptors was determined using a forskolin-dependent adenylyl cyclase inhibition assay; both 14a and 14b were found to be partial agonists. Furthermore, for compound 14a, the log D value of 2.85 suggested it has suitable lipophilicity for crossing the blood–brain-barrier.
合成了一系列取代的1H-吲哚羧酸酰胺,这些化合物包含N-(2-甲氧基苯基)哌嗪或N-(2-氟乙氧基)哌嗪基团,并确定了它们对人类多巴胺D2、D3和D4受体的亲和力。其中两个化合物,14a和14b,在D3受体上显示出高结合亲和力(Ki分别为0.18和0.4 nM),并且在D3与D2受体之间具有选择性(分别为87倍和60倍)。这两个化合物在D4受体和σ受体位点的结合亲和力较低。通过使用依赖于福斯可林的腺苷酸酰化酶抑制测定,确定了这些化合物在D2和D3受体上的内在活性;发现14a和14b都是部分激动剂。此外,对于化合物14a,其log D值为2.85,表明其具有适合穿越血脑屏障的脂溶性。