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Synthesis, X-ray crystallographic analysis, DFT studies and biological evaluation of triazolopyrimidines and 2-anilinopyrimidines

Journal Article


Abstract


  • Inspired by the reported antiviral activity of pyrimidines and triazolopyrimidines, two series of 2-anilinopyrimidines (5a-e) and 1-aryl-[1,2,4]triazolo[4,3-a]pyrimidines (14a-k) were designed and synthesized as potential antiviral agents. X-ray crystallographic study of compounds (14d) and (14k) confirmed the structure of the desired isomer and revealed the coplanarity of the fused [1,2,4]triazolo[4,3-a]pyrimidine rings with the aryl side group. DFT studies revealed insights into the mechanism of the micro-reversible cyclisation step using DFT [B3LYP-D3(BJ)/6���31++G(d,p)]. The pharmacokinetic properties and calculation of drug likeness scores (DLS) of (5a-e) and (14a-k) suggested good traditional drug-like properties and led to the synthesis of derivatives (14a-k) which were evaluated for their anti-viral activity with the most potent derivatives subjected to cytotoxicity screening. Compounds (14a), (14c), (14e), (14f) and (14k) showed moderate to strong antiviral activity with EC50 values 38 - 186 ��M. Compound (14e) (DLS = 0.29) showed the best anti-CHIKV activity (EC50 = 38 ��M) and lowest cytotoxicity (CC50 > 300 ��g/ml) against breast cancer cell lines, MCF-7 and MD-AMB-231 and normal cell line EA.hy926. Simplification of [1,2,4]triazolo[4,3-a]pyrimidine ring, led to series (5a-e) (DLS = 0.03 - 0.77). Derivatives (5a-d) showed fair anti-CHIKV activity (EC50 > 200 ��M), while (5e) emerged as the most active antiviral agent, however the most cytotoxic.

Publication Date


  • 2022

Citation


  • Fares, M., Canfield, P., Alsherbiny, M. A., Lewis, W., Willis, A. C., Guang Li, C., . . . Keller, P. A. (2022). Synthesis, X-ray crystallographic analysis, DFT studies and biological evaluation of triazolopyrimidines and 2-anilinopyrimidines. Journal of Molecular Structure, 1252. doi:10.1016/j.molstruc.2021.132092

Scopus Eid


  • 2-s2.0-85121302223

Web Of Science Accession Number


Volume


  • 1252

Issue


Place Of Publication


Abstract


  • Inspired by the reported antiviral activity of pyrimidines and triazolopyrimidines, two series of 2-anilinopyrimidines (5a-e) and 1-aryl-[1,2,4]triazolo[4,3-a]pyrimidines (14a-k) were designed and synthesized as potential antiviral agents. X-ray crystallographic study of compounds (14d) and (14k) confirmed the structure of the desired isomer and revealed the coplanarity of the fused [1,2,4]triazolo[4,3-a]pyrimidine rings with the aryl side group. DFT studies revealed insights into the mechanism of the micro-reversible cyclisation step using DFT [B3LYP-D3(BJ)/6���31++G(d,p)]. The pharmacokinetic properties and calculation of drug likeness scores (DLS) of (5a-e) and (14a-k) suggested good traditional drug-like properties and led to the synthesis of derivatives (14a-k) which were evaluated for their anti-viral activity with the most potent derivatives subjected to cytotoxicity screening. Compounds (14a), (14c), (14e), (14f) and (14k) showed moderate to strong antiviral activity with EC50 values 38 - 186 ��M. Compound (14e) (DLS = 0.29) showed the best anti-CHIKV activity (EC50 = 38 ��M) and lowest cytotoxicity (CC50 > 300 ��g/ml) against breast cancer cell lines, MCF-7 and MD-AMB-231 and normal cell line EA.hy926. Simplification of [1,2,4]triazolo[4,3-a]pyrimidine ring, led to series (5a-e) (DLS = 0.03 - 0.77). Derivatives (5a-d) showed fair anti-CHIKV activity (EC50 > 200 ��M), while (5e) emerged as the most active antiviral agent, however the most cytotoxic.

Publication Date


  • 2022

Citation


  • Fares, M., Canfield, P., Alsherbiny, M. A., Lewis, W., Willis, A. C., Guang Li, C., . . . Keller, P. A. (2022). Synthesis, X-ray crystallographic analysis, DFT studies and biological evaluation of triazolopyrimidines and 2-anilinopyrimidines. Journal of Molecular Structure, 1252. doi:10.1016/j.molstruc.2021.132092

Scopus Eid


  • 2-s2.0-85121302223

Web Of Science Accession Number


Volume


  • 1252

Issue


Place Of Publication