One-step synthesis of novel 2,4-diaminopyrimidine antifolates from bridged alicyclic ketones and cyanoguanidine
作者:Andre Rosowsky、Andrew T. Papoulis、Sherry F. Queener
DOI:10.1002/jhet.5570360324
日期:1999.5
heterocyclic ring systems whose synthesis from sterically hindered ketones by other methods would have required multiple steps with an even lower overall yield. The products were tested as inhibitors of dihydrofolate reductases from Pneumocystis carinii, Toxoplasma gondii, and rat liver with a view to examining the effect of a space-filling bridge on binding. The most potent and selective compound in the
与氰基胍的便利的一步反应被用于将脂环族酮转化为先前未描述的在碳环中具有一个,两个或三个碳桥的2,4-二氨基-5,6,7,8-四氢喹唑啉。尽管所需产物的收率不高,但这一一步法的主要优势在于,它可轻松获得各种新颖的桥接杂环体系,这些体系通过其他方法由位阻酮合成需要经过多个步骤才能完成。甚至更低的总产量。产品经测试可作为卡氏肺孢子虫,弓形虫的二氢叶酸还原酶抑制剂,以及大鼠肝脏,以研究填充桥对结合的影响。该组中最有力和选择性的化合物是4,6-二氨基-3,5-二氮杂三环[7.2.1.0 2,7 ] dodeca-2,4,6-三烯(13),其效价和选择性接近甲氧苄啶。 ,一种通常用于治疗卡氏疟原虫和刚地弓形虫感染的药物。3,5-二氨基-4,6-二氮杂三环[6.2.1.0 2,7 ] -undeca-2,4,6-三烯(14),类似的13具有一个碳桥而不是两个碳桥对刚地弓形虫酶的效价和选择性相似,但它是卡