1 research outputs found
Structure-Based Design and Synthesis of 3‑Amino-1,5-dihydro‑4<i>H</i>‑pyrazolopyridin-4-one Derivatives as Tyrosine Kinase 2 Inhibitors
We report herein the discovery and
optimization of 3-amino-1,5-dihydro-4<i>H</i>-pyrazolopyridin-4-one
TYK2 inhibitors. High-throughput
screening against TYK2 and JAK1–3 provided aminoindazole derivative <b>1</b> as a hit compound. Scaffold hopping of the aminoindazole
core led to the discovery of 3-amino-1,5-dihydro-4<i>H</i>-pyrazolopyridin-4-one derivative <b>3</b> as a novel chemotype
of TYK2 inhibitors. Interestingly, initial SAR study suggested that
this scaffold could have a vertically flipped binding mode, which
prompted us to introduce a substituent at the 7-position as a moiety
directed toward the solvent-exposed region. Introduction of a 1-methyl-3-pyrazolyl
moiety at the 7-position resulted in a dramatic increase in TYK2 inhibitory
activity, and further optimization led to the discovery of <b>20</b>. Compound <b>20</b> inhibited IL-23-induced IL-22 production
in a rat PD assay, as well as inhibited IL-23 signaling in human PBMC.
Furthermore, <b>20</b> showed selectivity for IL-23 signaling
inhibition against GM-CSF, demonstrating the unique cytokine selectivity
of the novel TYK2 inhibitor