2,4-Diaminothieno[2,3-<i>d</i>]pyrimidine Lipophilic Antifolates as Inhibitors of <i>Pneumocystis carinii</i> and <i>Toxoplasma gondii</i> Dihydrofolate Reductase
作者:Andre Rosowsky、Andrew T. Papoulis、Sherry F. Queener
DOI:10.1021/jm970399a
日期:1997.10.1
2,4-diaminothieno[2,3-d]pyrimidine lipophilic dihydrofolate reductase inhibitors were synthesized as potential inhibitors of Pneumocystis carinii and Toxoplasma gondii dihydrofolate reductase. Pivaloylation of 2,4-diamino-5-methylthieno[2,3-d]pyrimidine followed by dibromination with N-bromosuccinimide in the presence of benzoyl peroxide gave 2,4-bis(pivaloylamino)-6-bromo-5-(bromomethyl)thieno[2,3-d]pyrimid
合成了十种以前未报道的2,4-二氨基噻吩并[2,3-d]嘧啶亲脂性二氢叶酸还原酶抑制剂,作为卡氏肺孢子虫和弓形体二氢叶酸还原酶的潜在抑制剂。2,4-二氨基-5-甲基噻吩并[2,3-d]嘧啶的苯甲酰化反应,然后在过氧化苯甲酰的存在下,用N-溴琥珀酰亚胺二溴化,得到2,4-双(新戊酰氨基)-6-溴-5-(溴甲基) )噻吩并[2,3-d]嘧啶胺,在与取代苯胺或N-甲基苯胺缩合并与碱脱保护后,生成2,4-二氨基-6-溴-5-[(取代苯胺基)甲基]噻吩并[2, 3-d]嘧啶。用硼氢化钠和氯化钯除去6-溴取代基。反应产率通常良好至优异。测试了该产品作为P.的二氢叶酸还原酶(DHFR)抑制剂的能力。卡里尼氏菌,弓形虫和大鼠肝脏。尽管由于6-未取代的化合物极差的溶解度而无法达到IC50,但是5种6-溴衍生物中的3种具有足够的溶解度,因此可以确定针对所有3种酶的IC50。2,4-二氨基-5- [3,5-二氯-4-(1-吡咯并苯胺基)甲基]