Discovery of 4-{4-[(3<i>R</i>)-3-Methylmorpholin-4-yl]-6-[1-(methylsulfonyl)cyclopropyl]pyrimidin-2-yl}-1<i>H</i>-indole (AZ20): A Potent and Selective Inhibitor of ATR Protein Kinase with Monotherapy in Vivo Antitumor Activity
作者:Kevin M. Foote、Kevin Blades、Anna Cronin、Shaun Fillery、Sylvie S. Guichard、Lorraine Hassall、Ian Hickson、Xavier Jacq、Philip J. Jewsbury、Thomas M. McGuire、J. Willem M. Nissink、Rajesh Odedra、Ken Page、Paula Perkins、Abid Suleman、Kin Tam、Pia Thommes、Rebecca Broadhurst、Christine Wood
DOI:10.1021/jm301859s
日期:2013.3.14
ATR is an attractive new anticancer drug target whose inhibitors have potential as chemo- or radiation sensitizers or as monotherapy in tumors addicted to particular DNA-repair pathways. We describe the discovery and synthesis of a series of sulfonylmorpholinopyrimidines that show potent and selective ATR inhibition. Optimization from a high quality screening hit within tight SAR space led to compound 6 (AZ20) which inhibits ATR immunoprecipitated from HeLa nuclear extracts with an IC50 of 5 nM and ATR mediated phosphorylation of Chk1 in HT29 colorectal adenocarcinoma tumor cells with an IC50 of 50 nM. Compound 6 potently inhibits the growth of LoVo colorectal adenocarcinoma tumor cells in vitro and has high free exposure in mouse following moderate oral doses. At well tolerated doses 6 leads to significant growth inhibition of LoVo xenografts grown in nude mice. Compound 6 is a useful compound to explore ATR pharmacology in vivo.