Synthesis and adenosine receptor affinity of a series of pyrazolo[3,4-d]pyrimidine analogs of 1-methylisoguanosine
作者:Fiona A. Harden、Ronald J. Quinn、Peter J. Scammells
DOI:10.1021/jm00113a031
日期:1991.9
Pyrazolo[3,4-d]pyrimidines are pyrazolo analogues of purines. They have been shown to be a general class of compounds which exhibit A1 adenosine receptor affinity. Two series of pyrazolo[3,4-d]pyrimidine analogues of 1-methylisoguanosine have been synthesized. The first involved substitution of the N1-position while the second involved substitution of the N5-position. Both alkyl and aryl substituents
吡唑并[3,4-d]嘧啶是嘌呤的吡唑并类似物。它们已被证明是一类具有A1腺苷受体亲和力的化合物。已经合成了两个系列的1-甲基异鸟苷的吡唑并[3,4-d]嘧啶类似物。第一个涉及N1位置的取代,而第二个涉及N5位置的取代。检查了烷基和芳基取代基。通过使用(R)-[3H] -N6-(苯基异丙基)腺苷结合测定法测试所有化合物的A1腺苷受体亲和力。3-氯苯基在N1位上显示最大活性,而丁基在N5位上显示最大活性。在这些位置的每一个中最好的取代基的组合增强了整体活性。最有效的化合物是4-氨基-5-N-丁基-1-(3-氯苯基)-1H-吡唑并[3,4-d]嘧啶-6(5H)-,IC50为6.4 x 10(- 6)M.通过用[3H] CGS 21680进行A2腺苷受体亲和力测定,检查了在受体亚类上的选择性。这一系列化合物对A2受体的效力稍弱。4-氨基-5-N-丁基-1-(3-氯苯基-1H-吡唑并[3,4-d]嘧