<i>Pneumocystis c</i><i>arinii</i> and <i>Toxoplasma </i><i>g</i><i>ondii</i> Dihydrofolate Reductase Inhibitors and Antitumor Agents: Synthesis and Biological Activities of 2,4-Diamino-5-methyl-6-[(monosubstituted anilino)methyl]- pyrido[2,3-<i>d</i>]pyrimidines
作者:Aleem Gangjee、Ona Adair、Sherry F. Queener
DOI:10.1021/jm990079m
日期:1999.7.1
achieved by reductive methylation. In contrast to previous reports of trimethoprim, the removal of methoxy and chloro groups from the phenyl ring in the 2, 4-diamino-5-methyl-6-[(substituted anilino)methyl]pyrido[2, 3-d]pyrimidine series generally did not decrease DHFR inhibitory activity. The monosubstituted phenyl analogues 5-12 were as potent against pcDHFR and tgDHFR as the previously reported disubstituted
合成了13个2,4-二氨基-5-甲基-6-[(单取代的苯胺基)甲基]吡啶并[2,3-d]嘧啶5-17作为潜在的卡氏肺孢子虫(pc)和弓形虫(tg)二氢叶酸还原酶( DHFR)抑制剂和抗肿瘤剂。设计化合物5-17以研究苯环中单甲氧基和单卤化物取代以及C9-N10桥的N10-甲基化的结构-活性关系。化合物5-12的合成路线涉及将常见的中间体2,4-二氨基-5-甲基吡啶并[2,3-d]嘧啶-6-腈(18)与适当的苯胺还原胺化。N10-甲基化通过还原甲基化来实现。与甲氧苄啶的先前报道相反,在2,4-二氨基-5-甲基-6-[(取代的苯胺基)甲基]吡啶基[2,3-d]嘧啶系列通常不降低DHFR抑制活性。单取代的苯基类似物5-12对pcDHFR和tgDHFR的作用与先前报道的二取代的苯基类似物相同。N10-甲基化通常会导致针对pcDHFR和tgDHFR的效力略有增加。评价了化合物5、7和9,并显示其在纳