Nanographenes have been attracting increasing attention owing to their widespread applications in organic electronics. Polycyclic aromatic hydrocarbons are popular research subjects due to their high stability, planar structure and optical spectra.

In the present study, a series of 2,3-dihydro-1,5-benzothiazepine derivatives 1B – 14B has been synthesized sand characterized by various spectroscopic techniques. The enzyme inhibitory activities of the target analogues were assessed using in vitro and in vivo mechanism-based assays. The tested compounds 1B – 14B exhibited in vitro inhibitory potential against α-glucosidase with IC 50 = 2.62 ± 0.16 to 10.11 ± 0.32 μM as compared to the standard drug acarbose (IC 50 = 37.38 ± 1.37 μM). Kinetic studies of the most active derivatives 2B and 3B illustrated competitive inhibitions. Based on the α-glucosidase inhibitory effect, the compounds 2B , 3B , 6B , 7B , 12B , 13B , and 14B were chosen in vivo for further evaluation of antidiabetic activity in streptozotocin-induced diabetic Wistar rats. All these evaluated compounds demonstrated significant antidiabetic activity and were found to be nontoxic in nature. Moreover, the molecular docking study was performed to elucidate the binding interactions of most active analogues with the various sites of the α-glucosidase enzyme (PDB ID 3AJ7 ). Additionally, quantitative structure–activity relationship (QSAR) studies were performed based on the α-glucosidase inhibitory assay. The value of correlation coefficient ( r ) 0.9553 shows that there was a good correlation between the 1B – 14B structures and selected properties. There is a correlation between the experimental and theoretical results. Thus, these novel compounds could serve as potential candidates to become leads for the development of new drugs provoking an anti-hyperglycemic effect.

The single-wing extension of the bowl-shaped tribenzotriquinacene (TBTQ) framework with polycondensed aromatic hydrocarbon units has been reported. In the course of a Scholl reaction, one of the three-dimensional bays of the TBTQ core has been bridged by a PAH unit to generate a seven-membered ring within the merged TBTQ-(hexa-peri-hexabenzocoronene) scaffold.

No abstract

No abstract

The synthesis of tribenzotriquinacenes (TBTQs) that bear three phenylethynyl groups at the peripheral positions of the bowl-shaped molecular scaffold has been achieved by use of different strategies. Although the C 1 -and C 3 -symmetrical triformyl, triethynyl and triiodo derivatives were inseparable by chromatography, the corresponding C 1 -and C 3 -symmetrical tris(phenylethynyl)tribenzotriquinacenes were obtained

This study reports the synthesis of sulfonamide‐derived Schiff bases as ligands L1 and L2 as well as their transition metal complexes [VO(IV), Fe(II), Co(II), Ni(II), Cu(II), and Zn(II)]. The Schiff bases (4‐{E‐[(2‐hydroxy‐3‐methoxyphenyl)methylidene]amino}benzene‐1‐sulfonamide (L1) and 4‐{[(2‐hydroxy‐3‐methoxyphenyl)methylidene]amino}‐N‐(5‐methyl‐1,2‐oxazol‐3‐yl)benzene‐1‐sulfonamide (L2) were synthesized by the condensation reaction of 4‐aminobenzene‐1‐sulfonamide and 4‐amino‐N‐(3‐methyl‐2,3‐dihydro‐1,2‐oxazol‐5‐yl)benzene‐1‐sulfonamide with 2‐hydroxy‐3‐methoxybenzaldehyde in an equimolar ratio. Sulfonamide core ligands behaved as bidentate ligands and coordinated with transition metals via nitrogen of azomethine and the oxygen of the hydroxyl group. Ligand L1 was recovered in its crystalline form and was analyzed by single‐crystal X‐ray diffraction technique which held monoclinic crystal system with space group (P21/c). The structures of the ligands L1and L2 and their transition metal complexes were established by their physical (melting point, color, yields, solubility, magnetic susceptibility, and conductance measurements), spectral (UV–visible [UV–Vis], Fourier transform infrared spectroscopy, 1H NMR, 13C NMR, and mass analysis), and analytical (CHN analysis) techniques. Furthermore, computational analysis (vibrational bands, frontier molecular orbitals (FMOs), and natural bonding orbitals [NBOs]) were performed for ligands through density functional theory utilizing B3LYP/6‐311+G(d,p) level and UV–Vis analysis was carried out by time‐dependent density functional theory. Theoretical spectroscopic data were in line with the experimental spectroscopic data. NBO analysis confirmed the extraordinary stability of the ligands in their conjugative interactions. Global reactivity parameters computed from the FMO energies indicated the ligands were bioactive by nature. These procedures ensured the charge transfer phenomenon for the ligands and reasonable relevance was established with experimental results. The synthesized compounds were screened for antimicrobial activities against bacterial (Streptococcus aureus, Bacillus subtilis, Eshcheria coli, and Klebsiella pneomoniae) species and fungal (Aspergillus niger and Aspergillus flavous) strains. A further assay was designed for screening of their antioxidant activities (2,2‐diphenyl‐1‐picrylhydrazine radical scavenging activity, total phenolic contents, and total iron reducing power) and enzyme inhibition properties (amylase, protease, acetylcholinesterase, and butyrylcholinesterase). The substantial results of these activities proved the ligands and their transition metal complexes to be bioactive in their nature.

Aurones are the plant secondary metabolites belonging to the flavonoid’s family. The bioactivities of aurones are very promising, thus these heterocyclic compounds can be considered as an alluring scaffold for drug design and development.