摘要：Since nucleic acids(DNA and RNA) play very important roles in cells,they are molecular targets of many clinically used drugs,such as anticancer drugs and *** of clinical demands for treating various deadly cancers and drug-resistant strains of pathogens,there are urgent needs to develop novel therapeutic *** nucleic acids hasn’t been the mainstream of drug discovery in the past,and the lack of 3D structural information for designing and developing drug specificity is one of the main ***,many important structures of nucleic acids and their protein complexes have been determined over the past decade,which provide novel platforms for future drug design and *** this review,we describe some useful nucleic acid structures,particularly their interactions with the ligands and therapeutic candidates or even *** summarize important information for designing novel potent drugs and for targeting nucleic acids and protein-nucleic acid complexes to treat cancers and overcome the drug-resistant problems.

摘要：Starting from 4,6-dimethyl-2-oxo-(1H)-3-pyridinecarbonitrile 1 and 3-aminopyrazolopyridine 4, a series of cyanopyri- dine derivatives 3a-i, Schiff bases 5a-f, urea and thiourea derivatives 6a-b, amide derivatives 7a-h, pyridopyra- zolopy-rimidine 8a-b and pyridopyrazolotriazine 10a-b were synthesized. Activities of eleven representative compounds were evaluated against A-549 (lung), HEPG2 (liver) and HCT-116 (colon) cancer cell lines. The findings revealed that some of the synthesized compounds showed remarkable anticancer activities, especially 8b which displayed the highest activity among the tested compounds with IC50 equal to 2.9, 2.6 and 2.3 μmol. In addition to synthesis and biological activities, we present discussion about the rationale of the design and activity of the potent compound 8b using struc- ture-based modeling tools.