Experimental and DFT Studies on Poly[di-μ3-acesulfamato-O,O:O′;O′:O,O-di-μ-acesulfamato-O,O; N-di-μ-aqua-dicalcium(II)] Complex

Structural Investigation and Hirshfeld Surface Analysis of 2-6-Dimethoxy-4-((2-Nitrophenylimin)Methyl) Phenol

INTRODUCTION

The reaction between 4-hydroxy-3,5-dimethoxyenzaldehyde and 2-nitroaniline has been discovered, and the final product has been identified such as 2-6-dimethoxy- 4-((2-nitrophenylimin)methyl)phenol (C1).

MATERIALS AND METHODS

X-ray diffraction examination per-formed on a single crystal provided conclusive evidence regarding the structure. Crystallography reveals that the two molecules A and B that were enclosed within the asymmetric unit are struc-turally distinct from one another. C-H·O, N-H·O, and O-H·O bonding is primarily respon-sible for the crystal packing stability. HO and off-set stacking interactions also contribute to the crystal packing's overall stability.

RESULTS

To do further research into the intermolecular interactions, the Hirshfeld surface analysis technique is utilized. It is possible to determine the partiality of the interatomic contacts to create crystal packing interactions by computing the improvement ratio for those contacts. In addition, computational research is carried out with the B3LYP/6-31G(d,p) model to determine the amount of energy that is required for molecular pairs to interact.

CONCLUSION

The study concluded the roles those different kinds of interaction energy play in maintaining the stability of the molecular pair.

PTK6: An emerging biomarker for prognosis and immunotherapeutic response in clear cell renal carcinoma (KIRC)

Kidney renal clear cell carcinoma (KIRC), one of the most prevalent form of kidney carcinoma, is highly aggressive cancer known for significant immune infiltration and high mortality rates. The absence of sensitivity to traditional therapy has spurred the search for new treatments. Protein Tyrosine Kinase 6 (PTK6) is implicated in promoting cancer growth, spread, and metastasis. Our review of The Cancer Genome Atlas database revealed PTK6 overexpression in KIRC, though its specific role in this cancer type was unclear. We investigated PTK6's cancer-promoting roles in KIRC using the database and confirmed our findings with patient-derived tissues. Our analysis showed that elevated PTK6 expression is linked to worse outcomes and higher levels of immune infiltration. It also correlates positively with neo-antigens (NEO) and DNA ploidy changes in KIRC. This research delves into PTK6's role in KIRC development, suggesting PTK6 as a possible biomarker for prognosis and treatment in KIRC.

Synthesis, crystal structure, spectroscopic characterization, DFT calculations, Hirshfeld surface analysis, molecular docking, and molecular dynamics simulation investigations of novel pyrazolopyranopyrimidine derivatives

A series of new pyrazolopyranopyrimidine derivatives (3-9) were synthesized from 5-amino-2,4-dihydro-3-methyl-4-phenylpyrano-[2,3-c]pyrazole-5-carbonitrile (2) by multicomponent reactions (MCR) involving malononitrile, benzaldehyde, and pyrazolone under refluxing ethanol in the presence of piperidine. Compound (2) was then converted to 2-acetylpyrazolopyranopyrimidine (3) through a reaction with acetic anhydride. The deprotection of 3 using ammonium hydroxide in ethanol, leads to 4. Subsequent chlorination of 4 by phosphorus oxychloride affords 5 which was alkylated using methyl iodide and ethyl bromoacetate in DMF, leading to regioisomers 6-9. The products were characterized by spectroscopic techniques (1H and 13C NMR) and confirmed by single crystal X-ray diffraction (XRD) studies for 2, 5, 6, and 9. Moreover, the geometrical parameters, molecular orbital calculations, and spectral data of 2, 5, 6, and 9 were compared by DFT at the B3LYP/6-311G(d,p) level of theory. There is good agreement between the calculated results and the experimental data. The intermolecular contacts for 2, 5, 6, and 9 were studied by Hirshfeld surface analysis. In addition, the molecular docky study was conducted to investigate the binding patterns of 2, 5, 6, and 9 within the binding site of cyclin-dependent kinase 2 (CDK2) and penicillin-binding protein 1 A. After the docking process, molecular dynamics (MD) simulations for 100 ns were performed on CDK2 and PBP 1 A proteins in the complex with 5.Communicated by Ramaswamy H. Sarma.

Rational synthesis, biological screening of azo derivatives of chloro-phenylcarbonyl diazenyl hydroxy dipyrimidines/thioxotetrahydropyrimidines and their metal complexes

Herein, a new series of azo ligands HL-1 (5-(2-chloro-6-(phenylcarbonyl)phenyl)diazenyl)-6-hydroxydihydropyrimidines-2,4dione), HL-2 (5-(2-chloro-6-(phenylcarbonyl)phenyl)diazenyl)-6-hydroxy-2-thioxottetrahydropyrimidin-4one), HL-3 (5-(2,4-dichloro-6-(phenylcarbonyl)phenyl) diazenyl)-6-hydroxydihydropyrimidines-2,4dione), HL-4 (5-(2,4-dichloro-6-(phenylcarbonyl) phenyl)diazenyl)-6-hydroxy-2-thioxotetrahydropyrimidin-4one) and their metal complexes with Cu(II) & Ni(II) were synthesized successfully having excellent yield, in reproducible conditions and for structure elucidation different advance spectroscopic techniques (FTIR, ¹H NMR, ¹³C NMR and Mass Spectrometry) were applied. In FTIR analysis, the absence of peak at 3450-3550 cm ^-1 due to -NH₂ and presence of a new peak of N=N at 1390-1520 cm^-1 confirmed synthesis of the ligands. The ¹H NMR spectra of azo ligands showed singlet peak at 11.5-13.5 ppm (Ar-OH) for hydroxyl group and -NH₂ signals disappearance of anilines at 4-5 ppm also gives strong indication for the synthesis of azo compounds. On complexation two most important peaks (M-O, M-N) appeared in all the metal chelates in the range of 400-600 cm^-1 which were not present in any of the ligands, confirmed the formation of complexes. Molecular ion peaks in mass spectra at 273, 388, 407 and 423 m/z value for ligands as well as for complexes at 803, 835, 871 and 904 m/z also give strong indication that proposed ligands and their metal complexes are produced successfully. Biological screening of the synthesized compounds were also carried out against different bacterial strains (E.coli, S.typhi, and B.subtilis), antifungal (C.albicans, A.niger, and C.glabrata) strains and antioxidant activity. From results it was observed that HL-4 and Cu complexes exhibited maximum inhibition against all bacterial and fungal strains as compared to other ligands and standard drug.

Structural and IR-spectroscopic characterization of pyridinium acesulfamate, a monoclinic twin

The crystal structure of pyridinium 6-methyl-1,2,3,-oxathiazine-4(3H)-one-2,2-dioxide [(C5NH6)(C4H4NO4S)], for short, pyH(ace), was determined by X-ray diffraction methods. It crystallizes as a twin in the monoclinic space groupP21/cwitha=6.9878(9),b=7.2211(7),c=21.740(2) Å,β=91.67(1)° andZ=4 molecules per unit cell. The structure was determined employing 1599 reflections withI>2σ(I) from one of the twin domains and refined employing 2092 reflections from both crystal domains to an agreement R1 factor of 0.0466. Besides electrostatic attractions, intermolecular pyH···O=C(ace) hydrogen bonds stabilize the acesulfamate anion and the pyridinium cation into planar discrete units parallel to the (100) crystal plane. The units form stacks of alternating ace−and pyH+ions along theaaxis that favors inter-ring π–π interactions. The Fourier transform-infrared (FT-IR) spectrum of the compound was recorded and is briefly discussed. Some comparisons with related pyridinium saccharinate salts are also made.

Crystal structure of strontium and barium acesulafame (6-methyl-4-oxo-4H-1,2,3-oxa-thia-zin-3-ide 2,2-dioxide)

Both strontium and barium acesulfames, namely poly[aqua-bis-(μ3-6-methyl-2,2-dioxo-1,2λ6,3-oxa-thia-zin-4-olato)strontium(II)], [Sr(C4H4NO4S)2(H2O)] n , and the barium(II) analogue, [Ba(C4H4NO4S)2(H2O)] n , crystallize in nearly identical isotypic forms, with barium-oxygen inter-atomic distances being longer due to the larger ionic radius of the barium(II) ion. The coordination number of the metal ion is 9; the coordination polyhedra can be described as distorted capped square anti-prisms [Johnson solid J10; Johnson (1966). Can. J. Math.18, 169-200]. The conformation of the acesulafame ions is a distorted envelope with an out-of-plane S atom. Metal and acesulfame ions are assembled into infinitive chains along the [100] axis. These chains are connected via hydrogen bonds into a three-dimensional network.

Structural and IR-spectroscopic characterization of cadmium and lead(II) acesulfamates

Cadmium and lead(II) acesulfamate, Cd(C4H4NO4S)2·2H2O and Pb(C4H4NO4S)2, were prepared by the reaction of acesulfamic acid and the respective metal carbonates in aqueous solution, and characterized by elemental analysis. Their crystal structures were determined by single crystal X-ray diffraction methods. The Cd(II) compound crystallizes in the monoclinic space group P21/c with Z=4 and the corresponding Pb(II) salt in the triclinic space group P1̅ with Z=2. In both salts, acesulfamate acts both as a bi-dentate ligand through its nitrogen and carbonyl oxygen atoms and also as a mono-dentate ligand through this same oxygen atom, giving rise to polymeric structures; in the Pb(II) salt the ligand also binds the cation through its sulfoxido oxygen atoms. The FTIR spectra of the compounds were recorded and are briefly discussed. Some comparisons with other related acesulfamate and saccharinate complexes are made.

Structural and IR-spectroscopic characterization of magnesium acesulfamate

Magnesium acesulfamate, Mg(C4H4NO4S)2·6H2O, was prepared by the reaction of acesulfamic acid and magnesium carbonate in aqueous solution, and characterized by elemental analysis. Its crystal structure was determined by single crystal X-ray diffraction methods. The substance crystallizes in the triclinic space group P1̅ with one molecule per unit cell. The FTIR spectrum of the compound was also recorded and is briefly discussed. Some comparisons with other simple acesulfamate and saccharinate salts are also made.

Chiral calcium iodide for asymmetric Mannich-type reactions of malonates with imines providing β-aminocarbonyl compounds

Out of the pybox: We have developed a novel chiral calcium iodide catalyst from CaI2 and a pybox that is stable under moisture and oxygen. This catalyst was applied to catalytic asymmetric Mannich-type reactions of malonates with both N-Boc-protected aromatic and aliphatic imines, and resulted in moderate to high yields with high enantioselectivities. To the best of our knowledge, this is the first example of highly enantioselective metal-catalyzed asymmetric Mannich-type reactions of malonates with N-Boc-protected aliphatic imines. The Mannich adduct was successfully converted into the α-hydroxy β-amino acid derivative. We have also shown the unique structure of the chiral Ca complexes with malonates.