Introduction of a Methyl Group Curbs Metabolism of Pyrido[3,4- d]pyrimidine Monopolar Spindle 1 (MPS1) Inhibitors and Enables the Discovery of the Phase 1 Clinical Candidate N(2)-(2-Ethoxy-4-(4-methyl-4 H-1,2,4-triazol-3-yl)phenyl)-6-methyl- N(8)-neopentylpyrido[3,4- d]pyrimidine-2,8-diamine (BOS172722).

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Citation

Woodward HL, Innocenti P, Cheung KJ, Hayes A, Roberts J, Henley AT, Faisal A, Mak GW, Box G, Westwood IM, Cronin N, Carter M, Valenti M, De Haven Brandon A, O'Fee L, Saville H, Schmitt J, Burke R, Broccatelli F, van Montfort RLM, Raynaud FI, Eccles SA, Linardopoulos S, Blagg J, Hoelder S

Introduction of a Methyl Group Curbs Metabolism of Pyrido[3,4- d]pyrimidine Monopolar Spindle 1 (MPS1) Inhibitors and Enables the Discovery of the Phase 1 Clinical Candidate N(2)-(2-Ethoxy-4-(4-methyl-4 H-1,2,4-triazol-3-yl)phenyl)-6-methyl- N(8)-neopentylpyrido[3,4- d]pyrimidine-2,8-diamine (BOS172722).

J Med Chem. 2018 Sep 27;61(18):8226-8240. doi: 10.1021/acs.jmedchem.8b00690. Epub 2018 Sep 10.

PubMed ID
30199249 [ View in PubMed
]
Abstract

Monopolar spindle 1 (MPS1) occupies a central role in mitosis and is one of the main components of the spindle assembly checkpoint. The MPS1 kinase is an attractive cancer target, and herein, we report the discovery of the clinical candidate BOS172722. The starting point for our work was a series of pyrido[3,4- d]pyrimidine inhibitors that demonstrated excellent potency and kinase selectivity but suffered from rapid turnover in human liver microsomes (HLM). Optimizing HLM stability proved challenging since it was not possible to identify a consistent site of metabolism and lowering lipophilicity proved unsuccessful. Key to overcoming this problem was the finding that introduction of a methyl group at the 6-position of the pyrido[3,4- d]pyrimidine core significantly improved HLM stability. Met ID studies suggested that the methyl group suppressed metabolism at the distant aniline portion of the molecule, likely by blocking the preferred pharmacophore through which P450 recognized the compound. This work ultimately led to the discovery of BOS172722 as a Phase 1 clinical candidate.

DrugBank Data that Cites this Article

Drugs
Drug Targets
DrugTargetKindOrganismPharmacological ActionActions
BOS172722Dual specificity protein kinase TTKProteinHumans
Yes
Inhibitor
Details