Effects of 8-phenyl and 8-cycloalkyl substituents on the activity of mono-, di, and trisubstituted alkylxanthines with substitution at the 1-, 3-, and 7-positions
作者:Mah T. Shamim、Dieter Ukena、William L. Padgett、John W. Daly
DOI:10.1021/jm00126a014
日期:1989.6
The effects of 8-phenyl and 8-cycloalkyl substituents on the activity of theophylline, caffeine, 1,3-dipropylxanthine, 1,3-dipropyl-7-methylxanthine, 3-propylxanthine, and 1-propylxanthine at A1 adenosine receptors of rat brain and fat cells and at A2 adenosine receptors of rat pheochromocytoma PC12 cells and human platelets are compared. An 8-phenyl substituent has little effect on the activity of
8-苯基和8-环烷基取代基对大鼠脑A1腺苷受体上茶碱,咖啡因,1,3-二丙基黄嘌呤,1,3-二丙基-7-甲基黄嘌呤,3-丙基黄嘌呤和1-丙基黄嘌呤活性的影响比较了大鼠嗜铬细胞瘤PC12细胞和人血小板的脂肪细胞和A2腺苷受体。8-苯基取代基对咖啡因或1,3-二丙基-7-甲基黄嘌呤在腺苷受体上的活性几乎没有影响,而茶碱,1,3-二丙基黄嘌呤,1-异戊基-3-异丁基黄嘌呤,1-甲基黄嘌呤和3-丙基黄嘌呤。8-苯基-1-丙基黄嘌呤在所有受体上均有效(Ki = 20-70 nM)。对羧基或对磺基取代基,它被引入8-苯环以增加水溶性,在大多数情况下,会降低A1受体的活性和选择性。在8-对-磺基类似物中,只有8-(对-磺基苯基)茶碱和1,3-二丙基-8-(对-磺基苯基)黄嘌呤对A1受体具有选择性。咖啡因,1,3-二丙基-7-甲基黄嘌呤和3-丙基黄嘌呤的8-对-磺基苯基衍生物对A2受体具有一定的选择性。8