Design, Synthesis, and Biological Evaluation of C<sup>9</sup>- and C<sup>2</sup>-Substituted Pyrazolo[4,3-<i>e</i>]-1,2,4-triazolo[1,5-<i>c</i>]pyrimidines as New A<sub>2A</sub> and A<sub>3</sub> Adenosine Receptors Antagonists
作者:Pier Giovanni Baraldi、Francesca Fruttarolo、Mojgan Aghazadeh Tabrizi、Delia Preti、Romeo Romagnoli、Hussein El-Kashef、Allan Moorman、Katia Varani、Stefania Gessi、Stefania Merighi、Pier Andrea Borea
DOI:10.1021/jm021023m
日期:2003.3.1
C(2)-substituted pyrazolo[4,3-e]-1,2,4-triazolo[1,5-c]pyrimidines to represent an extension of structure-activity relationship work on this class of tricyclic compounds. The introduction of a substituent at 9 position of the tricyclic antagonistic structure led to retention of receptor affinity but a loss of selectivity in respect to the lead compounds b, N(8)-substituted-pirazolo[4,3-e]-1,2,4-triazolo[1,5-c]pyrimidines-N(5)-urea
在过去的几年中,我们小组一直致力于A(2A)和A(3)腺苷受体拮抗剂的开发,从而导致了SCH58261(5-氨基-7-(2-苯乙基)-2-( 2-furyl)pyrazolo [4,3-e] -1,2,4-triazolo [1,5-c] pyrimi dine,61),对A(2A)受体亚型和N(8 )-取代的吡唑并[4,3-e] -1,2,4-三唑并[1,5-c]嘧啶-N(5)-脲或酰胺(MRE系列,b),对人A的选择性很高(3)腺苷受体亚型。我们现在描述一系列由C(9)-和C(2)取代的吡唑并[4,3-e] -1,2,4-三唑并[1,5-c]嘧啶,以代表结构的扩展-这类三环化合物之间存在活性关系。在三环拮抗结构的9位上引入取代基导致保留受体亲和力,但相对于先导化合物b,N(8)-取代的吡唑并[4,3-e] -1,失去了选择性, 2,4-三唑并[1,5-c]嘧啶-N(5)-脲或-酰胺。受