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.
Concerted nucleophilic aromatic substitution with 19F− and 18F−
作者:Constanze N. Neumann、Jacob M. Hooker、Tobias Ritter
DOI:10.1038/nature17667
日期:2016.6.16
unusual concerted nucleophilicaromaticsubstitutionreaction (CSNAr) that is not limited to electron-poor arenes, because it does not proceed via a Meisenheimer intermediate. We show a phenol deoxyfluorination reaction for which CSNAr is favored over a stepwise displacement. Mechanistic insights enabled us to develop a functional group–tolerant 18F-deoxyfluorination reaction of phenols, which can be used