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Synthesis, Cytostatic and Antiviral Evaluations of the New C-5 Substituted Pyrimidine and Furo[2, 3-d]pyrimidine 4, 5-Didehydro-L-ascorbic Acid Derivatives

Some pyrimidine and purine derivatives of 4, 5-didehydro-5, 6-dideoxy-L-ascorbic acid exerted pronounced cytostatic and antiviral activities.1 The novel C-5 alkynyl substituted pyrimidine (1-11) and furo[2, 3-d]pyrimidine derivatives (12-22) of L-ascorbic acid (Figure) were synthesized by coupling of 5-iodouracil-4, 5-didehydro-5, 6-dideoxy-L-ascorbic acid with terminal alkynes by using Sonogashira cross-coupling reaction conditions. The new compounds were evaluated for their cytostatic and antiviral activities. Among all evaluated compounds the octynyl-substituted uracil derivative of L-ascorbic acid (3) exhibited the most pronounced cytostatic activities against all examined tumor cell lines (IC50: 2-12 μ M). Pyrimidine derivatives of L-ascorbic acid containing p-substituted phenylacetylene groups (8-11) displayed also a rather pronounced (IC50: 3-37 μ M) inhibitory effect towards all tumor cell lines. From the bicyclic series of compounds, 6-butylfuro[2, 3-d]pyrimidine derivative (12) and 6-p-bromophenylfuro[2, 3-d]pyrimidine derivative (19) showed the highest cytostatic activity (IC50: 4.5-20 μ M), particularly against malignant leukemia (L1210) and T-lymphocyte (Molt4/C8 and CEM) cells. Compounds 8 and 9 also showed some activity against cytomegalovirus (CMV, Davis strain, EC50: 1.5 μ M) at a 10-fold lower concentration than that required for cytotoxicity. Thus, the compounds reported here are worth considering for further development as potential leads for cytostatic and/or antiviral agents. 1. Raić-Malić, S. et al, J. Med. Chem. 1999 (42) 2673 ; Raić-Malić, S. et al. J. Med. Chem. 2000 (43) 4806 ; Gazivoda, T. et al, Bioorg. Med. Chem., 2005 (13) 131 ; Gazivoda, T. et al. Bioorg. Med. Chem. 2007 (15) 749.

C-5 substituted pyrimidine and furo[2; 3-d]pyrimidine derivatives; L-ascorbic acid; cytostatic evaluations

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