Catalytic response and molecular simulation studies in the development of synthetic routes in trimeric triaryl pyridinium type ionic liquids

Under conventional and silica-supported Muffle furnace methods, water-soluble substituted trimeric triaryl pyridinium cations with various inorganic counter anions are synthesized. The solvent-free synthesis method is superior to the conventional method in terms of non-toxicity, quicker reaction times, ease of workup, and higher yields. Trimeric substituted pyridinium salts acted as excellent catalytic responses for the preparation of Gem-bisamide derivatives compared with available literature. To evaluate the molecular docking, benzyl/4-nitrobenzyl substituted triaryl pyridinium salt compounds with VEGFR-2 kinase were used with H-bonds, π-π stacking, salt bridges, and hydrophobic contacts. The results showed that the VEGFR-2 kinase protein had the most potent inhibitory activity. Intriguingly, the compound [NBTAPy]PF₆^- had a strongly binds to VEGFR-2 kinase and controlled its activity in cancer treatment and prevention.

Aminomethyl Transfer (Mannich) Reactions Between an O-Triethylsilylated Hemiaminal and Anilines, Rn C6 H5-n NH2 Leading to New Diamines, Triamines, Imines, or 1,3,5-Triazines Dependent upon Substituent R

The reactions of the Mannich reagent Et₃ SiOCH₂ NMe₂ (1) with a variety of anilines (mono-substituted RC₆ H₄ NH₂ , R=H, 4-CN, 4-NO₂ , 4-Ph, 4-Me, 4-MeO, 4-Me₂ N; di-substituted R₂ C₆ H₃ NH₂ , R₂ =3,5-(CH₃ )₂ , 3,5-(CF₃ )₂ ; tri-substituted R₃ C₆ H₂ NH₂ , R₃ =3,5-Me₂ -4-Br and a "super bulky" aniline (Ar*NH₂ ) [Ar*=2,6-bis(diphenylmethyl)-4-tert-butylphenyl]) led to the formation of a range of products dependent upon the substituent. With electron-withdrawing substituents, previously unknown diamines, RC₆ H₄ NH(CH₂ NMe₂ ) [R=CN (2 a), NO₂ (2 b)] and R₂ C₆ H₃ NH(CH₂ NMe₂ ) [R₂ =3,5-(CF₃ )₂ (2 c)] were formed. Further reaction of 2 a, b, c with 1 yielded the corresponding triamines RC₆ H₄ N(CH₂ NMe₂ )₂ (R=CN (3 a), NO₂ (3 b) and R₂ C₆ H₃ N(CH₂ NMe₂ )₂ , R₂ =3,5-(CF₃ )₂ (3 c). The new polyamines were characterized by NMR spectroscopy, and for 2 a, 2 c_, and 3 c, by single crystal XRD. In the case of electron-donating groups, R=4-OMe, 4-NMe₂ , 4-Me, 3,5-Me₂ , 3,5-Me₂ -4-Br, and for R=4-Ph, the reactions with 1 immediately led to the formation of the related 1,3,5-triazines, R=4-MeO (5 a), 4-Me₂ N (5 b), 4-Me (5 c), 3,5-Me₂ (5 d), 3,5-Me₂ -4-Br (5 e), 4-Ph (5 f), 4-Cl (5 g). The "super bulky" aniline rapidly produced a single product, namely the corresponding imine Ar*N=CH₂ (4) which was also characterized by single crystal XRD. Imine 4 is both thermally and oxidatively stable. All reactions are very fast, thus based upon the presence of Si we are tempted to denote the reactions of 1 as examples of "Silick" chemistry.