Condensation of 4-chloroacetophenone 1 with phenyl hydrazine 2 afforded hydrazone 3. Further reaction of 3 with Vilsmeier reagent yielded the pyrazolaldehyde 4 in excellent yield. A one-pot, three-component reaction between aldehyde 4, triphenylphosphite 5, and appropriate amines in the presence of lithium perchlorate as Lewis acid catalyst gave the corresponding α-amino phosphonates 7-12(a-d) in good yields. The chemical structures of all new compounds were established by IR, 1H NMR, and mass spectroscopy analysis. The anti-proliferative activity of the synthesized compounds against HCT-116, HepG2 and MCF-7 human cancer cells using the MTT assay was evaluated, and revealed higher anticancer activity when compared with reference drug doxorubicin. Among the tested compounds, pyrazole derivatives 4 and 9 exhibited the highest anticancer activity against breast (MCF-7), and colon (HCT-116) cancer cell lines with IC50 = 2.7 and 3.3 μM, respectively.
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We would like to acknowledge financial support of the Menoufia University throughout project No Ib-2013.
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Abdelwahed, R.E., Radhi, A.H., Awad, H.M. et al. Synthesis and Anti-Proliferative Activity of New α-Amino Phosphonate Derivatives Bearing Heterocyclic Moiety. Pharm Chem J 55, 231–239 (2021). https://doi.org/10.1007/s11094-021-02404-1
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DOI: https://doi.org/10.1007/s11094-021-02404-1