European Journal of Medicinal Chemistry p. 282 - 291 (2018)
Update date:2022-08-10
Topics:
Ashraf, Adnan
Ejaz, Syeda Abida
Rahman, Shafiq Ur
Siddiqui, Waseeq Ahmad
Arshad, Muhammad Nadeem
Lecka, Joanna
Sévigny, Jean
Zayed, Mohie E. Moustafa
Asiri, Abdullah M.
Iqbal, Jamshed
Hartinger, Christian G.
Hanif, Muhammad
Chalcones and 1,2-benzothiazines are two important classes of bioactive compounds, each scaffold endowed with diverse pharmacological activities. Combining both of these pharmacophores in a single molecule was aimed to yield multi-modal agents. Herein, we report a series of hybrid compounds 3a–3o derived from chalcones and 1,2-benzothiazine cores. They were synthesized from commercially available sodium saccharin, and the resulting 1,2-benzothiazine-derived ketone was then condensed with aromatic aldehydes in an aldol condensation to obtain the respective chalcones. The compounds were characterized using different analytical techniques including FT-IR, NMR spectroscopy, mass spectrometry and X-ray crystallography. Some synthesized chalcones revealed potent and/or selective inhibitory properties towards alkaline phosphatase isozymes transiently expressed in COS-7 cells. A detailed structure-activity and selectivity study was carried out with regard to the effect of different substituents at ortho-, meta- and para-positions of the phenyl residue. Compound 3c was the most effective human intestinal alkaline phosphatase (h-IAP) inhibitor (IC50 value of 1.04 μM), while it was not active against human tissue non-specific alkaline phosphatase (h-TNAP) isozyme. In contrast, 3i was a selective inhibitor of h-TNAP with IC50 values of 0.25 ± 0.01 μM. The possible binding interactions of the most effective inhibitors of h-TNAP and h-IAP were obtained from molecular docking studies.
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