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Title: Synthesis of pyrazolo[1,5-a][1,3,5]triazine derivatives as inhibitors of thymidine phosphorylase
Authors: Sun, L.
Bera, H.
Chui, W.K. 
Keywords: Enzyme inhibitor
Thymidine phosphorylase
Issue Date: 2013
Citation: Sun, L., Bera, H., Chui, W.K. (2013). Synthesis of pyrazolo[1,5-a][1,3,5]triazine derivatives as inhibitors of thymidine phosphorylase. European Journal of Medicinal Chemistry 65 : 1-11. ScholarBank@NUS Repository.
Abstract: Thymidine phosphorylase (TP) is an enzyme that promotes tumor growth and metastasis and therefore is an attractive druggable target. Using a reported TP inhibitor, 7-deazaxanthine (7DX), as the lead compound; this study was set up to evaluate whether pyrazolo[1,5-a][1,3,5]triazin-2,4-diones and pyrazolo[ 1,5- a][1,3,5]triazin-2-thioxo-4-ones would exhibit TP inhibitory activity. The pyrazolo[1,5-a][1,3,5] triazine nucleus was constructed using a reaction that annulated the 1,3,5-triazine ring onto a pyrazole scaffold. Among the 52 compounds synthesized and tested, it was found that 1,3-dihydro-pyrazolo[1,5-a] [1,3,5]triazin-2-thioxo-4-ones exhibited various extent of inhibitory activity against TP. The best compound 17p, which bears a para-substituted pentafluorosulfur group, showed an IC50 value of 0.04 μM, which was around 800 times more potent than the 7DX (IC50 = 32 μM) under the same bioassay conditions. The results of the study suggested that a substituent with +σ and +π properties inserted at position 4 of a phenyl ring that is attached to position 8 of the pyrazolo[1,5-a][1,3,5]triazin- 2-thioxo-4-one scaffold would give excellent TP inhibitory action. In addition, 17p was found to be a non-competitive inhibitor thus suggested that it might interact with TP at a position different from the substrate binding site. © 2013 Elsevier Masson SAS. All rights reserved.
Source Title: European Journal of Medicinal Chemistry
ISSN: 02235234
DOI: 10.1016/j.ejmech.2013.03.063
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