Ionic liquid mediated synthesis and molecular docking study of novel aromatic embedded Schiff bases as potent cholinesterase inhibitors

Developing a fast and catalyst-free protocol to form C=N double bond with high functional group tolerance

The carbon-nitrogen double bond (C=N) is a fundamentally important functional group in organic chemistry. This is largely due to the fact that C=N acts as electrophilic synthon to give nitrogen-containing compounds. Here, we report the condensation of primary amine or hydrazine with very electron-deficient aldehyde to form C=N bond in the absence of any catalysts (metals and acids). The protocol performs at room temperature and applies water as co-solvent. Two hundred examples are presented here. With its intrinsic advantages of wide substrate scopes, excellent efficiency (high yields and short reaction time), operational simplicity, mild condition (room temperature as reaction temperature, no catalysts, no additions, water as co-solvent and opening to air) and available starting materials, the protocol can be compatible with various drugs, prodrugs, dyes and pharmacophores containing primary amino group. In addition, we also successfully apply this protocol to rapidly synthesize the core scaffolds of bioactive molecules.

Crystal structure of 1-{4-[(5-Chloro-2-hydroxy-benzylidene)amino]phenyl} ethanone O-ethyl-oxime, C17H17ClN2O2

C17H17ClN2O2, monoclinic, Pc (no. 7), a = 17.789(2) Å, b = 7.1127(7) Å, c = 6.2885(6) Å, β = 97.513(10)°, Z = 2, V = 788.83(15) Å3, Rgt(F) = 0.0600, wRref(F2) = 0.1651, T = 290.83(10) K.

Synthesis and crystal structure of 1-{4-[(2-hydroxy-benzylidene)amino]phenyl}ethanone oxime, C15H14N2O2

C15H14N2O2, monoclinic, P21/c (no. 14), a = 13.5809(12) Å, b = 9.7794(14) Å, c = 9.8883(9) Å, β = 97.972(9)°, Z = 4, V = 1300.6(3) Å3, R gt(F) = 0.0635, wR ref(F 2) = 0.1758, T = 291(2) K.

Biological Activity of Ionic Liquids and Their Application in Pharmaceutics and Medicine

Ionic liquids are remarkable chemical compounds, which find applications in many areas of modern science. Because of their highly tunable nature and exceptional properties, ionic liquids have become essential players in the fields of synthesis and catalysis, extraction, electrochemistry, analytics, biotechnology, etc. Apart from physical and chemical features of ionic liquids, their high biological activity has been attracting significant attention from biochemists, ecologists, and medical scientists. This Review is dedicated to biological activities of ionic liquids, with a special emphasis on their potential employment in pharmaceutics and medicine. The accumulated data on the biological activity of ionic liquids, including their antimicrobial and cytotoxic properties, are discussed in view of possible applications in drug synthesis and drug delivery systems. Dedicated attention is given to a novel active pharmaceutical ingredient-ionic liquid (API-IL) concept, which suggests using traditional drugs in the form of ionic liquid species. The main aim of this Review is to attract a broad audience of chemical, biological, and medical scientists to study advantages of ionic liquid pharmaceutics. Overall, the discussed data highlight the importance of the research direction defined as "Ioliomics", studies of ions in liquids in modern chemistry, biology, and medicine.