Discovery of pyrrolo[1,2-b]pyridazine-3-carboxamides as Janus kinase (JAK) inhibitors
作者:James J.-W. Duan、Zhonghui Lu、Bin Jiang、Bingwei V. Yang、Lidia M. Doweyko、David S. Nirschl、Lauren E. Haque、Shuqun Lin、Gregory Brown、John Hynes、John S. Tokarski、John S. Sack、Javed Khan、Jonathan S. Lippy、Rosemary F. Zhang、Sidney Pitt、Guoxiang Shen、William J. Pitts、Percy H. Carter、Joel C. Barrish、Steven G. Nadler、Luisa M. Salter-Cid、Murray McKinnon、Aberra Fura、Gary L. Schieven、Stephen T. Wrobleski
DOI:10.1016/j.bmcl.2014.10.061
日期:2014.12
A new class of Janus kinase (JAK) inhibitors was discovered using a rationally designed pyrrolo[1,2-b]pyridazine-3-carboxamide scaffold. Preliminary studies identified (R)-(2,2-dimethylcyclopentyl)amine as a preferred C4 substituent on the pyrrolopyridazine core (3b). Incorporation of amino group to 3-position of the cyclopentane ring resulted in a series of JAK3 inhibitors (4g–4j) that potently inhibited
使用合理设计的吡咯并[1,2-b]哒嗪-3-羧酰胺支架,发现了一类新的Janus激酶(JAK)抑制剂。初步研究确定(R)-(2,2-二甲基环戊基)胺是吡咯并哒嗪核芯(3b)上优选的C4取代基。将氨基结合到环戊烷环的3位上产生了一系列JAK3抑制剂(4g – 4j),该抑制剂在IL2诱导的全血测定中有效抑制IFNγ的产生,并且相对于JAK2表现出对JAK3–JAK1途径的高功能选择性。进一步的修饰导致发现口服生物可利用的(2-氟-2-甲基环戊基)氨基类似物5g 它是JAK3和TYK2的纳摩尔抑制剂,对JAK3–JAK1途径相对于JAK2具有功能选择性,并且在人全血测定中具有活性。