4-Amino-pyrrolopyridine-5-carboxamide: A Novel Scaffold for JAK1-Selective Inhibitors
作者:Heerim Shin、Mi Kyoung Kim、Youhoon Chong
DOI:10.1248/cpb.c13-00807
日期:——
Despite a high level of interest in selective Janus kinase 1 (JAK1) inhibitors and their potential for the treatment of inflammatory diseases such as rheumatoid arthritis (RA), only a few such inhibitors have been reported to date. In this study, a novel 4-amino-1H-pyrrolo[2,3-b]pyridine-5-carboxamide scaffold was designed through structural modification of the potent JAK1-selective inhibitor, C2-methyl imidazopyrrolopyridine. Among the series studied, the 4-(2-aminoethyl)amino-pyrrolopyridine derivative, 2j, exhibited a significant 24.7-fold JAK1/JAK2 selectivity along with reasonable inhibitory activity against JAK1 (IC50=2.2 µM). The noticeable JAK1-selectivity of 2j was then tackled through a molecular docking study, which showed that the aminoethyl functionality of 2j is well positioned to discriminate the subtle but significant difference in the size of the ligand binding sites between JAK1 and JAK2.
尽管对选择性Janus激酶1(JAK1)抑制剂及其在治疗炎症性疾病(如类风湿关节炎(RA))中的潜力充满高度兴趣,但迄今为止仅有少数此类抑制剂被报告。在本研究中,通过对强效JAK1选择性抑制剂C2-甲基咪唑并吡啶的结构改造,设计了一种新的4-氨基-1H-吡咯并[2,3-b]吡啶-5-羧酰胺支架。在研究的系列中,4-(2-氨基乙基)氨基吡咯并吡啶衍生物2j表现出显著的24.7倍JAK1/JAK2选择性,同时对JAK1具有合理的抑制活性(IC50=2.2 μM)。2j的显著JAK1选择性随后通过分子对接研究进行了解释,该研究表明,2j的氨基乙基功能在识别JAK1和JAK2之间配体结合位点尺寸细微但重要的差异方面定位良好。