We have investigated the SAR of a series of pyrimidinone-containing Cdc7 kinase inhibitors. A wide range of amine substitutions give potent compounds with activities (K-i) less than 1 nM. Kinase selectivity is reasonable and cytotoxicity corresponds to inhibition of MCM2 phosphorylation. (c) 2012 Elsevier Ltd. All rights reserved.
A pyrimidone derivative represented by formula (I) or a salts thereof: wherein R1 represents an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aryl group and the like; R2 represents a hydrogen atom, hydroxyl group, an alkyl group, an alkenyl group and the like, R3 represents a pyridyl group, and a medicament comprising said derivative or a salt thereof as an active ingredient which is used for preventive and/or therapeutic treatment of a disease caused by tau protein kinase l hyperactivity such as Alzheimer disease.