6-Substituted 2,4-Diaminopyrido[3,2-<i>d</i>]pyrimidine Analogues of Piritrexim as Inhibitors of Dihydrofolate Reductase from Rat Liver, <i>Pneumocystis carinii</i>, and <i>Toxoplasma gondii </i>and as Antitumor Agents
作者:Aleem Gangjee、Yuanming Zhu、Sherry F. Queener
DOI:10.1021/jm980206z
日期:1998.11.1
had a greater selectivity ratio for tgDHFR compared to trimetrexate (TMQ) or PTX, most notably 2, 4-diamino-6-[(3',4'- dimethoxyphenyl)thio]pyrido[3,2-d]pyrimidine (4), 2,4-diamino-6-[(2'-methoxyphenyl)sulfonyl]pyrido[3, 2-d]pyrimidine (7), and 2,4-diamino-6-(2', 5'-dimethoxyanilino)pyrido[3,2-d]pyrimidine (14) which combined relatively high potency at 10(-7)-10(-8) M along with selectivity ratios of
报道了吡咯特辛(PTX)的21个6-取代的2,4-二氨基吡啶并[3,2-d]嘧啶类似物(4-24)作为二氢叶酸还原酶(DHFR)的抑制剂和抗肿瘤剂的合成和生物活性。来自卡氏肺孢子虫(PC)的重组DHFR和来自弓形虫(tg)的天然DHFR是测试的目标酶。这些生物体是艾滋病患者致命的机会性感染的原因。大鼠肝脏(rl)DHFR用作哺乳动物参考酶,以确定对病原性DHFR的选择性。S9桥联化合物4-6的合成是通过将2,4-二氨基-6-氯吡啶并[3,2-d]嘧啶(27)用硫醇亲核试剂进行芳基置换而实现的。在冰醋酸中用过氧化氢氧化4-6,得到相应的砜类似物7-9。通过其前体3-氨基-6-(芳基氨基)-2-吡啶腈通过与氯甲am盐酸盐的热环化合成N9-桥连的化合物10-24。与S9桥联的化合物不同,N9桥联的类似物的芳基氨基侧链是在形成2,4-二氨基吡啶并[3,2-d]嘧啶核之前引入的。还使用类似于用于化合