Synthesis and Biological Activities of Conformationally Restricted, Tricyclic Nonclassical Antifolates as Inhibitors of Dihydrofolate Reductases
作者:Aleem Gangjee、Jufang Shi、Sherry F. Queener
DOI:10.1021/jm960693n
日期:1997.6.1
semirigid orientations were achieved by bridging the C5 and N10 of compound 12 with a N-ethyl bridge and by variation of the position of double bonds in rings B and C as well as substitution at the 2',6'-positions of the phenyl ring. The synthesis of compounds 5-11 were accomplished by cyclocondensation of the appropriate keto ester (as the biselectrophile) with 2,4,6-triaminopyrimidine to afford the
合成了七个新颖的三环嘧啶并[4,5-c] [2,7]萘啶酮5-8和相应的萘啶9-11作为二氢叶酸还原酶(DHFR)的构象受限抑制剂和抗肿瘤药和/或抗感染药。设计类似物以使侧链三甲氧基苯基基团在不同的构象确定的位置上取向,以研究侧链取向对来自各种物种的DHFR的结合亲和力和选择性的影响。通过将化合物12的C5和N10与N-乙基桥桥联以及通过改变环B和C中双键的位置以及在苯基的2',6'-位置上的取代来实现半刚性取向戒指。化合物5-11的合成是通过适当的酮酯(作为双亲电子试剂)与2,4,6-三氨基嘧啶的环缩合反应得到内酰胺5。脱氢内酰胺6和7通过空气氧化和PtO2催化的脱氢反应制得。分别为7。通过将内酰胺5和/或6在POCl 3或POCl 3 / PCl 5的混合物中回流获得二氯脱氢内酰胺8。化合物9-11是通过两种方法获得的,直接硼烷还原内酰胺5或6,或将二磺化内酰胺15硫杂iation