Fragment-based approach to the design of 5-chlorouracil-linked-pyrazolo[1,5-a][1,3,5]triazines as thymidine phosphorylase inhibitors
作者:Lingyi Sun、Jiarong Li、Hriday Bera、Anton V. Dolzhenko、Gigi N.C. Chiu、Wai Keung Chui
DOI:10.1016/j.ejmech.2013.10.022
日期:2013.12
were devised to generate the target compounds. The intermediate 5-chloro-6-chloromethyluracil was synthesized by a 4-step reaction. A series of the second bicyclic intermediates, namely pyrazolo[1,5-a][1,3,5]triazin-2-thioxo-4-one, was obtained from various substituted 3-aminopyrazoles. These two intermediates were coupled finally in the presence of sodium ethoxide and methanol to yield the desirable target
基于基于片段的药物设计方法,将5-氯尿嘧啶连接的吡唑并[1,5- a ] [1,3,5]三嗪设计为新型胸苷磷酸化酶抑制剂。设计了多步收敛合成方案以生成目标化合物。中间体5-氯-6-氯甲基尿嘧啶通过4步反应合成。一系列第二双环中间体,即吡唑并[1,5- a从各种取代的3-氨基吡唑获得] [1,3,5]三嗪-2-硫代-4-酮。最后将这两种中间体在乙醇钠和甲醇的存在下偶联,得到所需的目标化合物。发现甲硫基偶联间隔基适合于使两个片段在酶的活性位点和变构位点相互作用。最佳偶联化合物(9q)抑制了胸苷磷酸化酶,IC 50值低至0.36±0.1μM。另外,9q表现出混合型的酶抑制动力学,因此表明它可能确实可能在酶的两个不同位点结合。