Further Studies on 2,4-Diamino-5-(2‘,5‘-disubstituted benzyl)pyrimidines as Potent and Selective Inhibitors of Dihydrofolate Reductases from Three Major Opportunistic Pathogens of AIDS
作者:Andre Rosowsky、Ronald A. Forsch、Sherry F. Queener
DOI:10.1021/jm020466n
日期:2003.4.1
with one less carbon than 3 in the side chain, had a selectivity index of 910 against Ma DHFR and was 43 times more potent than TMP. 2,4-Diamino-5-[5'-(5-carboxypentyl)-2'-methoxybenzyl]pyrimidine (6) had a selectivity index of 490 against Tg DHFR and was 320 times more potent than TMP. 2,4-Diamino-5-[5'-(6-carboxy-1-hexynyl)-2'-methoxybenzyl]pyrimidine (4), with one more carbon than 3, was less potent
通过比较每种化合物对寄生虫酶的效力及其对大鼠肝脏DHFR的效力来评估DHFR抑制的选择性指数。2,4-二氨基-5- [5'-(5-羧基-1-戊炔基)-2'-甲氧基苄基]嘧啶(3)抑制Pc DHFR,选择性指数为79,效力比TMP强430倍。2,4-二氨基-5- [5'-(4-羧基-1-丁炔基)-2'-甲氧基苄基]嘧啶(2),侧链碳原子比3少1,对二甲醚的选择性指数为910 Ma DHFR,效力是TMP的43倍。2,4-二氨基-5- [5'-(5-羧基戊基)-2'-甲氧基苄基]嘧啶(6)对Tg DHFR的选择性指数为490,效力是TMP的320倍。2,4-二氨基-5- [5'-(6-羧基-1-己炔基)-2'-甲氧基苄基]嘧啶(4),且碳原子比3多一个,对所有三种寄生虫酶的效力均低于3或6,并且对Pc酶的选择性指数也低于3。但是,4是该系列中唯一的一个,其对Tg和Ma DHFR的选择性指数均大