Synthesis and Structure−Activity Relationship of Pyrazolo[3,4-<i>d</i>]pyrimidines: Potent and Selective Adenosine A<sub>1</sub> Receptor Antagonists
作者:Sally-Ann Poulsen、Ronald J. Quinn
DOI:10.1021/jm960052s
日期:1996.1.1
structural differences between the A1 and A2a receptors with respect to the binding of pyrazolo[3,4-d]pyrimidines. This study resulted in prediction that increased A1 affinity could be achieved by incorporation of NH-alkyl substituents at C-4. This was confirmed by synthesis of alpha-[[4-(methylamino)-1-phenylpyrazolo[3,4-d]pyrimidin-6-yl]thiol] hexanamide (15) which was found to have an A1 Ki of 0.745 nM
合成一系列12个取代的1-苯基吡唑并[3,4-d]嘧啶并评估其对大鼠脑腺苷A1和A2a受体的结合亲和力。为了在受体亚型的分子识别方面定义这些区域,改变了C-4和C-6处的取代基。在C-4处,评估了巯基,甲硫基和氨基取代基的作用,而在C-6处,研究了具有从α-碳延伸的烷基的酰胺。这项研究确定了有效和选择性的腺苷A1受体拮抗剂。在这12种化合物中,最有效的化合物是α-[(4-氨基-1-苯基吡唑并[3,4-d]嘧啶-6-基)硫基]己酰胺(14);该化合物的A1 Ki为0.939 nM,A2a Ki为88.3 nM,是A1选择性的94倍。在这12种化合物中,选择性最高的是α-[[4-(甲硫基)-1-苯基吡唑并[3,4-d]嘧啶-6-基]硫代]己酰胺(10); 如果A1 Ki为6.81 nM,A2a Ki> 40 000 nM,则该化合物对A1的选择性是> 5900倍。完整系列的结构-活性关系已确定在吡唑并[3