Molecularly Imprinted Polymer and Computational Study of (E)-4-(2- cyano-3-(dimethylamino)acryloyl)benzoic Acid from Poly(ethylene terephthalate) Plastic Waste

Antimicrobial, anticancer activities, molecular docking, and DFT/B3LYP/LANL2DZ analysis of heterocyclic cellulose derivative and their Cu-complexes

In this study, novel Cu-complexes of heterocyclic cellulose which were synthesized via the reaction of carboxymethyl cellulose (CMC) from bagasse pulp with NH2NH2 to give hydrazide cellulose which easily reacted with CS2 to form salt and then cyclized in the presence of HCl to afford cellulose oxadiazole, or with hydrazine hydrate to give cellulose triazole. Furthermore, the cellulose oxadiazole and triazole moieties acting as chelating agents with metal ion Cu (II), and all synthesized compounds were examined for their spectral analysis to show the adsorption of Cu (II) on the surface of cellulose through intramolecular hydrogen bonding. Results illustrated that cellulose oxadiazole and Cu- cellulose oxadiazole exhibited antimicrobial activities more than triazole and Cu- cellulose triazole. Furthermore, anticancer results showed that both cellulose oxadiazole and triazole exhibited activity higher than Cu-cellulose oxadiazole and Cu-cellulose triazole, where the cellulose triazole showed the highest activity (IC50 = 58.7 μg/μL). Additionally, the docking simulation of the synthesized cellulose complexes with different proteins such as PDBID:3t88, PDBID:4ynt, PDBID:1tgh, PDBID:2wje, and PDBID:4hdq and shortage bond length to confirm the experimental results. Optimization of metal complexes utilized the DFT/B3LYP/LANL2DZ basis set to confirm the stability of these metals theoretically and their physical descriptors and FMO analysis.

The Use of Computational Methods for the Development of Molecularly Imprinted Polymers

Recent years have witnessed a dramatic increase in the use of theoretical and computational approaches in the study and development of molecular imprinting systems. These tools are being used to either improve understanding of the mechanisms underlying the function of molecular imprinting systems or for the design of new systems. Here, we present an overview of the literature describing the application of theoretical and computational techniques to the different stages of the molecular imprinting process (pre-polymerization mixture, polymerization process and ligand-molecularly imprinted polymer rebinding), along with an analysis of trends within and the current status of this aspect of the molecular imprinting field.

Synthesis, Antitumor Activity, Molecular Docking and DFT Study of Novel Pyrimidiopyrazole Derivatives

BACKGROUND

In this investigation, 2-cyano-N-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl) acetamide (3) reacts with dimethylformamide dimethyl acetal (DMF-DMA) to afford the corresponding (E)- 2-cyano-3-(dimethylamino)-N-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)acrylam-ide (4) utilizing microwave irradiation. The condensation reactions of acrylamide derivative 4 with hydrazine derivatives obtain pyrazole derivatives 6a and 6b; respectively. The synthesized compounds demonstrate in vitro antitumor activity against liver tumor cell line HepG2. Furthermore, additional studies were carried out on the most effective compound 6b to evaluate the potential interaction against 4hdq synthase complex with ΔE= -4.5Kcal/mol and with short distance = 1.727Å and 2.027Å, respectively. The comprehensive theoretical studies of compounds 6a and 6b is based on bond length, bond angles and energy gap HOMO-LUMO. In addition, the vibrational frequencies of optimized compounds 6a and 6b were examined through DFT/B3LYP/6+31G(d) basis set.

METHODS

In this research, synthesis of novel pyrimidiopyrazole derivatives calculated the computational studies to find suitable drug-receptor interactions and biological activity.

RESULTS AND DISCUSSION

The synthesized pyrimidiopyrazole derivative 6b exhibited high antitumor activity IC50 =12.6 μg/ml and interacted it with 4hdq synthase complex with ΔE=-4.5Kcal/mol and with short distance = 1.727Å and 2.027Å. Furthermore, the optimized compounds utilize Gaussian 09W.

CONCLUSION

In the optimized pyrimidiopyrazole derivatives, 6b showed better antitumor activity HeG-2 against 5-flurouracil due to its energy and confirmed more potent of hydrogen bond interaction with protein pocket.

Synthesis, antimicrobial, anti-proliferative activities, molecular docking and DFT studies of novel pyrazolo[5,1-c][1, 2, 4]triazine-3-carboxamide derivatives

In this investigation, we studied the reactivity of 5-aminouracil (1) with ethyl cyanoacetate (2) utilizing microwave irradiation to afford the corresponding 2-cyano-N-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)acetamide (3) in excellent yield. The electrophilic azo-coupling reaction of acetamide 3 with aromatic diazonium salts afforded the corresponding hydrazone derivatives 4a-d. The Michael addition cyclization of hydrazone in pyridine to give pyrazolo[5,1-c][1, 2, 4]triazine-3-carboxamide 5a-d derivatives. The obtained compounds were elucidated against antimicrobial activity and antitumor activity breast cancer cells (MCF-7) and liver cancer cells (HepG2) utilized MTT assay. Compounds 5b, 5c and 5d revealed more inhibitory influence on MCF7 and HepG2 growth than the reference drug doxorubicin (Dox) after 48 h incubation. Furthermore, molecular docking studies were carried out on one of the most effective compound 4-amino-N-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-7-(4-fluorophenyl) pyrazole [5,1-c][1, 2, 4]triazine-3-carboxamide (5c) (TFC) with (PDB: 3t88), (PDB: 2wje) , (PDB: 4ynt), (PDB: 1tgh), (PDB: 4hdq) and (PDB: 3pxe) which attached with different proteins with different energies and shortage bond distance. Also; the comprehensive theoretical and experimental mechanical studies of compound TFC and TMC were compatible with FTIR and ¹H NMR spectral data. The optimized molecular structure of TFC with FTIR was examined via DFT/ B3LYP/6-31G (d) level.Communicated by Ramaswamy H. Sarma.

Synthesis, antimicrobial activities, docking studies and computational calculations of new bis-1,4-phenylene -1H-1,2,3-triazole derivatives utilized ultrasonic energy

In this elucidation, we studied the utility of condensation reaction between 1,4-phenylenediamine (1) with acetyl acetone (2) with hydrazine hydrate utilized ultrasonic energy in one step reaction to afford the corresponding 1,1'-(1,4-phenylenebis (5-methyl-1H-1,2,3-triazole-1,4-diyl))bis(ethan-1-one) (4) in excellent yield. The ethanol solution of bis triazole (4) and different aldehyde derivatives were sonicated at 75 °C for 2 h to afford chalcone derivatives 5a-d which were confirmed via spectral data such as FTIR, ¹HNMR, ¹³CNMR and mass spectra. Moreover, the intermolecular cyclization of chalcone (5a) with NH₂NH₂ in sodium hydroxide solution to give the corresponding 4,5-dihydro-1H-pyrazol-5-yl)-1H-indole (6) using ultrasonic energy for 4 h, while the Michael addition of chalcones (5a) and (5 b) with thiourea in basic condition to afford the corresponding pyrimidine-2-thiol derivatives (7) and (9). Treatment of compound (7) with NH₂NH₂ to afford 1,4-bis(4-(2-hydrazineyl-6-(1H-indol-3-yl)pyrimidin-4-yl) derivatives (8). The synthesized compounds were screened against various microbial strains and displayed excellent antimicrobial potential. Additionally, the docking studies of these nine compounds were carried out with (PDB ID:3t88), (PDB ID:2wje), (PDB ID:4ynt) and (PDB ID:1tgh) which were attached with different amino acids with shortage bond length, and it was noticed that PMTS₁, PMTS₂ and PMTS₃ were the most stable compounds with the lowest energy affinity which is compatible with biological study. Furthermore, the theoretical investigation of bis-triazole compounds were optimized via DFT/B3LYP/6-31G(d) level which showed the hyperconjugation of nitrogen atoms and elucidated their physical parameters and NBO charges and confirmed their stability and biological activity.Communicated by Ramaswamy H. Sarma.