Conformationally Restricted Analogues of Trimethoprim: 2,6-Diamino-8-substituted Purines as Potential Dihydrofolate Reductase Inhibitors from <i>Pneumocystis carinii</i> and <i>Toxoplasma gondii</i>
作者:Aleem Gangjee、Anil Vasudevan、Sherry F. Queener
DOI:10.1021/jm970271t
日期:1997.9.1
appropriately substituted benzaldehyde or phenyl acetaldehyde, in acidic methoxyethanol. Analogues 21-23 were synthesized via nucleophilic displacement of 2,6-diamino-8-(chloromethyl)purine with the appropriate anilines or 2-naphthalenethiol. The compounds were evaluated as inhibitors of pcDHFR and tgDHFR with rat liver (rl) DHFR as the mammalian reference enzyme. Compound 11, the 3',4'-dichlorophenyl
合成了22个2,6-二氨基-8-取代的嘌呤(2-23),其中结合了嘧啶环和侧链苯基环的甲氧苄啶(TMP)的两个柔性键周围的旋转受到限制进入嘌呤环,以试图提高TMP对抗来自经常导致艾滋病患者致命性机会感染的生物体中的二氢叶酸还原酶(DHFR)的效力和选择性,例如卡氏肺孢子虫(pc)和弓形虫(tg)。类似物2-20的合成是通过2,4,5,6-四氨基嘧啶与适当取代的苯甲醛或苯基乙醛在酸性甲氧基乙醇中的一锅反应实现的。通过将2,6-二氨基-8-(氯甲基)嘌呤与适当的苯胺或2-萘硫醇进行亲核取代来合成类似物21-23。用大鼠肝脏(rI)DHFR作为哺乳动物参考酶,评价了这些化合物作为pcDHFR和tgDHFR的抑制剂。化合物11 3',4'-二氯苯基类似物的效价与TMP相同,对pcDHFR的选择性为13,这使其成为迄今已知的pcDHFR三种选择性最强的抑制剂(与rhDHFR相比)之一。它还显示出tg