Derivatives of 4-Amino-6-hydroxy-2-mercaptopyrimidine as Novel, Potent, and Selective A<sub>3</sub> Adenosine Receptor Antagonists
作者:Barbara Cosimelli、Giovanni Greco、Marina Ehlardo、Ettore Novellino、Federico Da Settimo、Sabrina Taliani、Concettina La Motta、Marusca Bellandi、Tiziano Tuccinardi、Adriano Martinelli、Osele Ciampi、Maria Letizia Trincavelli、Claudia Martini
DOI:10.1021/jm701159t
日期:2008.3.1
A number of derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine (5) were synthesized and biologically evaluated as A(3) adenosine receptor (A(3) AR) antagonists. The new compounds were designed as open chain analogues of a triazolopyrimidinone derivative displaying submicromolar affinity for the A3 AR, which had been previously identified using a 3D database search. Substituents R, R', and R" attached to the parent compound 5 were chosen according to factorial design and stepwise lead optimization approaches, taking into account the essentially hydrophobic nature of the A3 AR binding site. As a result, 5m (R = n-C3H7, R' = 4-ClC6H4CH2, R" = CH3) was identified among the pyrimidine derivatives as the ligand featuring the best combination of potency and selectivity for the target receptor. This compound binds to the A3 AR with a K-i of 3.5 nM and is devoid of appreciable affinity for the A(1), A(2A), and A(2B) ARs.