Inhibitors of dihydrofolate reductase as antitumor agents: design, synthesis and biological evaluation of a series of novel nonclassical 6-substituted pyrido[3,2-d]pyrimidines with a three- to five-carbon bridge
作者:Hao Li、Fang Fang、Yunqi Liu、Liangmin Xue、Meng Wang、Ying Guo、Xiaowei Wang、Chao Tian、Junyi Liu、Zhili Zhang
DOI:10.1016/j.bmc.2018.04.035
日期:2018.5
(rhDHFR). Analogue 3.5, which has a three-carbon bridge, inhibited the proliferation of HL-60 and HCT116 cells to a greater extent than the other analogues. Compound 3.5 was also the most potent inhibitor of rhDHFR (IC50 = 0.06 μM), and was approximately 38-fold more potent than the two-carbon-bridged lead compound. Docking studies revealed that both the length and flexibility of the saturated carbon
先前报道的非经典两碳桥联抗叶酸,2,4-二氨基-6-苯乙基吡啶并[3,2-d]嘧啶(wm-5a)的桥同源性提供了三碳桥,四碳桥和五碳桥抗叶酸类似物3.1-3.5、4.1-4.2和5.1-5.5。通过醛醇缩合或Wittig反应有效地合成并在碳桥的不同位置具有取代基的目标化合物。二碳桥到三,四或五碳桥的延伸,以及碳桥的饱和,为化合物提供了对重组人DHFR(rhDHFR)的良好抑制活性。具有三碳桥的类似物3.5比其他类似物更大程度地抑制HL-60和HCT116细胞的增殖。化合物3.5也是rhDHFR的最有效抑制剂(IC50 = 0。06μM),且效力比两碳桥联的铅化合物高约38倍。对接研究表明,3.5中的饱和碳桥的长度和柔韧性对于高效能都很重要。流式细胞术研究表明,化合物3.5在S期阻滞了HL-60细胞并诱导了细胞凋亡。用3.5处理的HL-60细胞的蛋白质印迹分析显示DHFR蛋白水平呈剂量依赖性上调。