Fragment-based lead discovery of indazole-based compounds as AXL kinase inhibitors was written by Ng, Pearly Shuyi;Foo, Klement;Sim, Sandra;Wang, Gang;Huang, Chuhui;Tan, Li Hong;Poulsen, Anders;Liu, Boping;Tee, Doris Hui Ying;Ahmad, Nur Huda Binte;Wang, Sifang;Ke, Zhiyuan;Lee, May Ann;Kwek, Zekui P.;Joy, Joma;Anantharajan, Jothi;Baburajendran, Nithya;Pendharkar, Vishal;Manoharan, Vithya;Vuddagiri, Susmitha;Sangthongpitag, Kanda;Hill, Jeffrey;Keller, Thomas H.;Hung, Alvin W.. And the article was included in Bioorganic & Medicinal Chemistry in 2021.Reference of 90721-35-0 This article mentions the following:
AXL is a member of the TAM (TYRO3, AXL, MER) subfamily of receptor tyrosine kinases. It is upregulated in a variety of cancers and its overexpression is associated with poor disease prognosis and acquired drug resistance. Utilizing a fragment-based lead discovery approach, a new indazole-based AXL inhibitor was obtained. The indazole fragment hit 11, identified through a high concentration biochem. screen, was expeditiously improved to fragment 24 by screening our inhouse expanded library of fragments (ELF) collection. Subsequent fragment optimization guided by docking studies provided potent inhibitor 54 with moderate exposure levels in mice. X-ray crystal structure of analog 50 complexed with the I650M mutated kinase domain of Mer revealed the key binding interactions for the scaffold. The good potency coupled with reasonable kinase selectivity, moderate in vivo exposure levels, and availability of structural information for the series makes it a suitable starting point for further optimization efforts. In the experiment, the researchers used many compounds, for example, 5-Bromoisoquinolin-8-amine (cas: 90721-35-0Reference of 90721-35-0).
5-Bromoisoquinolin-8-amine (cas: 90721-35-0) belongs to isoquinoline derivatives. Although isoquinoline derivatives can be synthesized by several methods, relatively few direct methods deliver the unsubstituted isoquinoline. Isoquinoline-type alkaloids show biological activities similar to those of morphinane-, protoberberine-, and benzophenanthridine-type alkaloids.Reference of 90721-35-0
Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem