Preliminary in vitro studies on two potent, water-soluble trimethoprim analogues with exceptional species selectivity against dihydrofolate reductase from Pneumocystis carinii and Mycobacterium avium
作者:Ronald A. Forsch、Sherry F. Queener、Andre Rosowsky
DOI:10.1016/j.bmcl.2003.12.103
日期:2004.4
from Pneumocystis carinii (Pc), Toxoplasma gondii (Tg), Mycobacterium avium (Ma), and rat in comparison with the widely used antibacterial agent 2,4-diamino-5-(3',4',5'-trimethoxybenzyl)pyrimidine (trimethoprim, TMP). The selectivity index (SI) for each compound was calculated by dividing its 50% inhibitory concentration (IC(50)) against rat DHFR by its IC(50) against Pc, Tg, or Ma DHFR. The IC(50) of
2,4-二氨基-5- [3',4'-二甲氧基-5'-(5-羧基-1-戊炔基)]嘧啶(6)和2,4-二氨基-5- [3',4'-通过2,4-二氨基-5-(5'-碘-3',4'-二甲氧基苄基)嘧啶(9)经Sonogashira反应与适当的炔属化合物合成二甲氧基-5'-(4-羧基苯基乙炔基)苄基嘧啶(7)酯随后进行皂化,并与广泛使用的抗菌剂2,4-二氨基进行了比较,测试它们是卡氏肺孢子虫(Pc),弓形虫(Tg),鸟分枝杆菌(Ma)和大鼠的二氢叶酸还原酶(DHFR)抑制剂-5-(3′,4′,5′-三甲氧基苄基)嘧啶(甲氧苄啶,TMP)。通过将每种化合物对大鼠DHFR的50%抑制浓度(IC(50))除以对Pc,Tg或Ma DHFR的IC(50),计算出每种化合物的选择性指数(SI)。相对于Pc DHFR的IC(50)为1.0 nM,SI为5000。化合物7对Ma DHFR的IC(50)为8.2 nM,SI为11000。