Synthesis, Biological Evaluation, And Molecular Modeling of Chalcone Derivatives As Potent Inhibitors of Mycobacterium tuberculosis Protein Tyrosine Phosphatases (PtpA and PtpB)
Tuberculosis (TB) is a major infectious disease caused by Mycobacterium tuberculosis (Mtb). According to the World Health Organization (WHO), about 1.8 million people die from TB and 10 million new cases are recorded each year. Recently, a new series of naphthylchalcones has been identified as inhibitors of Mtb protein tyrosine phosphatases (PTPs). In this work, 100 chalcones were designed, synthesized, and investigated for their inhibitory properties against MtbPtps. Structure-activity relationships (SAR) were developed, leading to the discovery of new potent inhibitors with IC50 values in the low-micromolar range. Kinetic studies revealed competitive inhibition and high selectivity toward the Mtb enzymes. Molecular modeling investigations were carried out with the aim of revealing the most relevant structural requirements underlying the binding affinity and selectivity of this series of inhibitors as potential anti-TB drugs.
Efficient Synthesis and Neuroprotective Effect of Substituted 1,3-Diphenyl-2-propen-1-ones
An efficient synthesis involving a key aldol reaction and biological properties of 1,3-diphenyl-2-propen-1-ones 8-20 is described. The in vitro activity for 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging of 10 and 11 was 2 times higher than that for resveratrol. Compounds 9 and 11 were the strongest in suppression of in vitro nitric oxide (NO) generation and antiexcitotoxicity. Molecular modeling proposes an electron-donating group at the para position of acetophenones that leads to a dramatic increase in the suppression of NO production.
Discovery of efficient stimulators for adult hippocampal neurogenesis based on scaffolds in dragon's blood
discovered to efficiently stimulate adult rats' neurogenesis. In-depth structure-activity relationship studies proved the necessity of a stilbene scaffold that is absent in highly cytotoxic analogs such as chalcones and heteroaryl rings and inactive analogs such as diphenyl acetylene and diphenyl ethane, and validated the importance of an NH in the carboxamide and a methylenedioxy substituent on the
Syntheses of 2-methoxyestradiol (1) and eugenol (6) template based conformationally flexible and rigid diarylpropenes, 14(a–l) and 20(a–e), as nonsteroidal anticancer agents have been performed. The synthesized compounds were evaluated for their anticancer activity in in vitro using a panel of human cancer cell lines viz. MCF-7, A549, DU 145, KB and MDA-MB-231by SRB assay. Compounds 14i, 14k and 15a showed significant anticancer activity at IC50 between 10.27 μM to 27.91 μM in different cancer cell lines. The most active molecule, 14k, inhibited proliferation of cells by inducing apoptosis and arresting the cell cycle at the G2/M phase. In vitro toxicity of these compounds (14i, 14k and 15a) in healthy hepatic monocyte (THP-1) cells showed high selectivity of compounds towards cancerous vs. healthy cells.