Inhibition of <i>Pneumocystis carinii</i>, <i>Toxoplasma </i><i>gondii</i>, and <i>Mycobacterium avium</i> Dihydrofolate Reductases by 2,4-Diamino-5-[2-methoxy-5-(ω-carboxyalkyloxy)benzyl]pyrimidines: Marked Improvement in Potency Relative to Trimethoprim and Species Selectivity Relative to Piritrexim
作者:Andre Rosowsky、Ronald A. Forsch、Sherry F. Queener
DOI:10.1021/jm010407u
日期:2002.1.1
A series of previously undescribed 2,4-diamino-5-[2-methoxy-5-alkoxybenzyl]pyrimidines (3a-e) and 2,4-diamino-5-[2-methoxy-5-(omega-carboxyalkyloxy)benzyl]pyrimidines (3f-k) with up to eight CH2 groups in the alkoxy or omega-carboxyalkyloxy side chain were synthesized and tested for the ability to inhibit partially purified dihydrofolate reductase (DHFR) from Pneumocystis carinii (Pc), Toxoplasma gondii
一系列先前未描述的2,4-二氨基-5- [2-甲氧基-5-烷氧基苄基]嘧啶(3a-e)和2,4-二氨基-5- [2-甲氧基-5-(ω-羧基烷氧基)苄基合成了在烷氧基或ω-羧烷基氧基侧链中具有最多八个CH2基的]嘧啶(3f-k),并测试了其抑制卡氏肺孢子虫(Pc),弓形虫(Tg)的部分纯化的二氢叶酸还原酶(DHFR)的能力。 ,鸟分枝杆菌(Ma)和大鼠肝脏,并与两种标准抑制剂甲氧苄氨嘧啶(1)和派瑞特辛(2)进行比较。已知后一种药物非常有效,但对结合哺乳动物DHFR表现出明显的偏爱,而前一种药物对寄生虫酶的选择性很高,但抑制作用却弱得多。合成化合物3a-k的基本策略是,同时具有1和2某些特征的杂化结构可能比任何一种母体药物都具有更有利的效价和选择性组合。选择类似物3f-k是基于这样的想法,即相对于哺乳动物DHFR的活性位点,酸性ω-羧基可能优先与任何寄生虫物种的DHFR的活性位点的碱性中心相