Synthesis of new 2,4-Diaminopyrido[2,3-d]pyrimidine and 2,4-Diaminopyrrolo[2,3-d]pyrimidine inhibitors of Pneumocystis carinii, Toxoplasma gondii, and Mycobacterium avium dihydrofolate reductase
作者:Andre Rosowsky、Han Chen、Hongning Fu、Sherry F. Queener
DOI:10.1016/s0968-0896(02)00325-5
日期:2003.1
groups with base. Also prepared via a scheme based on the Taylor ring expansion/ring annulation synthesis were three heretofore undescribed 2,4-diamino-5-(substituted benzyl)-7H-pyrrolo[2,3-d]pyrimidines (3b-c). Standard spectrophotometric assays were used to compare the ability of 2a-e and 3b-c to inhibit dihydrofolate reductase (DHFR) from Pneumocystis carinii, Toxoplasma gondii, and Mycobacterium
开发了一条简洁的新路线,可轻松获得五个以前未报告的2,4-二氨基-6-(取代的苄基)吡啶并[2,3-d]嘧啶(2a-e),涉及2,4-二戊酰氨基-5的缩合。催化量的[1,1'-双(二苯基膦基)二茂铁]二氯钯(II).CH(2)Cl(2)存在下,将溴化吡啶并[2,3-d]嘧啶(6)与有机锌卤化物,然后用碱除去新戊酰基。还通过基于泰勒环膨胀/环环合成的方案制备了三个迄今为止未描述的2,4-二氨基-5-(取代的苄基)-7H-吡咯并[2,3-d]嘧啶(3b-c)。使用标准分光光度法比较了2a-e和3b-c抑制卡氏肺孢子虫,弓形虫和鸟分枝杆菌的二氢叶酸还原酶(DHFR)的能力,艾滋病患者由于免疫功能低下而极易受到机会病原体侵害的三个例子。为了进行比较,还评估了13种先前未经测试的2,4-二氨基-6-(取代的苄基)喹唑啉(17a-m)作为这些酶以及大鼠肝脏酶的抑制剂。测试的喹唑啉或吡啶嘧啶类化合物对卡