Design, Synthesis, and Antifungal Activity of New α-Aminophosphonates

Theoretical exploration on structures, bonding aspects and molecular docking of α-aminophosphonate ligated copper complexes against SARS-CoV-2 proteases

Recent years have witnessed a growing interest in the biological activity of metal complexes of α-aminophosphonates. Here for the first time, a detailed DFT study on five α-aminophosphonate ligated mononuclear/dinuclear CuII complexes is reported using the dispersion corrected density functional (B3LYP-D2) method. The electronic structures spin densities, FMO analysis, energetic description of spin states, and theoretical reactivity behaviour using molecular electrostatic potential (MEP) maps of all five species are reported. All possible spin states of the dinuclear species were computed and their ground state S values were determined along with the computation of their magnetic coupling constants. NBO analysis was also performed to provide details on stabilization energies. A molecular docking study was performed for the five complexes against two SARS-CoV-2 coronavirus protein targets (PDB ID: 6LU7 and 7T9K). The docking results indicated that the mononuclear species had a higher binding affinity for the targets compared to the dinuclear species. Among the species investigated, species I showed the highest binding affinity with the SARS-CoV-2 Omicron protease. NPA charge analysis showed that the heteroatoms of model species III had a more nucleophilic nature. A comparative study was performed to observe any variations and/or correlations in properties among all species.

Design, Synthesis, and Spectroscopic Studies of Some New α-Aminophosphonate Analogues Derived from 4-Hydroxybenzaldehyde with Special Reference to Anticancer Activity

Introduction

As biological activity components, α-aminophosphonates and their moieties play important roles in medicinal chemistry. Alpha-phosphonic acids are significant α-amino acid counterparts. Due to its strong biological activity, this class of molecule has recently been discovered to have numerous medical applications.

Results and Discussion

A new class of α-aminophosphonates and arylidene derivatives was synthesized. Various spectroscopic and elemental analyses were used to confirm the prepared products. The produced materials were tested as anticancer against breast carcinoma cells and normal human cells (PBMC). Besides the analysis results, it was found that (7b, 4c, 5k, 6, 5a, 7c, 5f, 5b, and 5g) against MCF-7 line cells. As a reference anticancer drug, 5-fluorouracil was used. The anticancer activities showed that the compounds 7b, 4c, containing α-aminophosphonate and Schiff base groups, respectively, showed high inhibition activity against the MCF-7 cell line, with 94.32% and 92.45% inhibition compared to the inhibition by 5-FU with 96.02% inhibition. The results showed that the compounds 5k, 7b, 6, and 5a, respectively, had very low activity against normal human cells PBMC, with 12.77%, 13%, 13.13%, and 17.88% inhibition compared to the inhibition by 5-FU with 12.50% inhibition. The binding energy for non-bonding interactions between the ligand (studied compounds) and receptor, thymidylate synthase, was determined using molecular docking (pdb code: 1AN5).

Conclusion

α-aminophosphonate derivatives, arylidines, and disphosphonate derivatives derived from 4-hydroxybenzaldehyde were synthesized, purified, elucidated by spectroscopic analysis, and finally tested against carcinoma breast cancer to give high to moderate to low activity.

Relationship between Structure and Antibacterial Activity of α-Aminophosphonate Derivatives Obtained via Lipase-Catalyzed Kabachnik-Fields Reaction

We reported a new method dealing with the synthesis of novel pharmacologically relevant α-aminophosphonate derivatives via a lipase-catalyzed Kabachnik−Fields reaction with yields of up to 93%. The advantages of this protocol are excellent yields, mild reaction conditions, low costs, and sustainability. The developed protocol is applicable to a range of H-phosphites and organic amines, providing a wide substrate scope. A new class of α-aminophosphonate analogues possessing P-chiral centers was also synthesized. The synthesized compounds were characterized on the basis of their antimicrobial activities against E. coli. The impact of the various alkoxy groups on antimicrobial activity was demonstrated. The crucial role of the substituents, located at the aromatic rings in the phenylethyloxy and benzyloxy groups, on the inhibitory action against selected pathogenic E. coli strains was revealed. The observed results are especially important because of increasing resistance of bacteria to various drugs and antibiotics.

Synthesis, in silico studies and antibacterial assessment of α-amino phosphonates derivatives

The widespread of multi-resistant strains due to the lack of specific treatment and the propagation of infectious diseases requires all resources to remedy this scourge. This study is therefore aimed to assess the antibacterial activity of four synthetic α-Aminophosphonate 4(a-d). Methods: Firstly, α-Aminophosphonate has been synthesized and characterized, then molecular docking of these compounds 4(a-d) into the active binding site of Escherichia coli MurB enzyme (PDB Id: 1MBT) was performed to gain a comprehensive understanding of their biological activity. These compounds have been subjected to in vitro antibacterial screening against three multi-resistant strains E. coli, S. aureus, and L. monocytogenes. These compounds showed crucial antibacterial behavior against all studied strains. Thus, their docking estimation supported the in vitro results and showed that the 4c derivative has considerable binding energy towards the active site of Escherichia coli MurB. These findings provide critical information for the exploration of α-amino phosphonates as novel antibacterial agents.