Discovery of a Potent, Orally Bioavailable PI4KIIIβ Inhibitor (UCB9608) Able To Significantly Prolong Allogeneic Organ Engraftment <i>in Vivo</i>
作者:James Reuberson、Helen Horsley、Richard J. Franklin、Daniel Ford、Judi Neuss、Daniel Brookings、Qiuya Huang、Bart Vanderhoydonck、Ling-Jie Gao、Mi-Yeon Jang、Piet Herdewijn、Anant Ghawalkar、Farnaz Fallah-Arani、Adnan R. Khan、Jamie Henshall、Mark Jairaj、Sarah Malcolm、Eleanor Ward、Lindsay Shuttleworth、Yuan Lin、Shengqiao Li、Thierry Louat、Mark Waer、Jean Herman、Andrew Payne、Tom Ceska、Carl Doyle、Will Pitt、Mark Calmiano、Martin Augustin、Stefan Steinbacher、Alfred Lammens、Rodger Allen
DOI:10.1021/acs.jmedchem.8b00521
日期:2018.8.9
The primary target of a novel series of immunosuppressive 7-piperazin-1-ylthiazolo[5,4-d]pyrimidin-5-amines was identified as the lipid kinase, PI4KIII beta. Evaluation of the series highlighted their poor solubility and unwanted off-target activities. A medicinal chemistry strategy was put in place to optimize physicochemical properties within the series, while maintaining potency and improving selectivity over other lipid kinases. Compound 22 was initially identified and profiled in vivo, before further modifications led to the discovery of 44 (UCB9608), a vastly more soluble, selective compound with improved metabolic stability and excellent pharmacokinetic profile. A co-crystal structure of 44 with PI4KIII beta was solved, confirming the binding mode of this class of inhibitor. The much-improved in vivo profile of 44 positions it as an ideal tool compound to further establish the link between PI4KIII beta inhibition and prolonged allogeneic organ engraftment, and suppression of immune responses in vivo.