• Radoslaw Laufer, Sze-Wan Li, Yong Liu, Grace Ng, Yunhui Lang, Miklos Feher, Richard Brokx, Irina Beletskaya, Richard Hodgson, Guodong Mao, Olga Plotnikova, Donald E Awrey, Jacqueline M Mason, Xin Wei, Dan Chi-Chia Lin, Yi Che, Reza Kiarash, Brian Madeira, Graham C Fletcher, Tak W Mak, Mark R Bray, and Henry W Pauls.
• Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada. Electronic address: Radek.Laufer@oicr.on.ca.
• Bioorg. Med. Chem. Lett. 2016 Aug 1; 26 (15): 3562-6.

AbstractTTK/Mps1 is a key kinase controlling progression of cell division via participation in the mitotic spindle assembly checkpoint and is overexpressed in a number of human cancers. Herein we report the discovery of 4-(4-aminopyrazolo[1,5-a][1,3,5]triazin-8-yl)benzamides as a potent, novel class of TTK inhibitors. The series was identified by means of bioisosteric replacement of the related imidazopyrazine and imidazopyridazine scaffolds. Optimization led to the identification of compounds with excellent potency (Ki=0.8nM) and exceptional kinase selectivity. The SAR indicates a strong dependence of activity on the presence of the N-cyclopropyl-2-methylbenzamide moiety delineating the geometry for 1½ type kinase inhibitor. Molecular modeling indicates the extensive and optimal contacts, mediated through H-bonds and hydrophobic interactions, are responsible for the selectivity and potency of the inhibitors. The compounds demonstrate a strong anti-proliferative activity in a panel of human cancer cell lines (HCT116 GI50<15nM) and good rodent pharmacokinetics (oral %F 97%).Copyright © 2016 Elsevier Ltd. All rights reserved.

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