Novel Method for the Syntheses of 2-Substituted Benzimidazoles Using Ti(IV) Isopropoxide and Cumene Hydroperoxide
作者:Freddy H. Havaldar、Ganesh Mule、Bhushan Dabholkar
DOI:10.1080/00397911.2011.571803
日期:2011.8
Abstract Various 2-substituted benzimidazoles were prepared in one pot by condensation of o-phenylenediamine with an appropriate aldehyde in good to excellent yields using a mixture of Ti(IV) isopropoxide and cumene hydroperoxide.
In this study the green, one-pot, solvent-free and selective synthesis of benzimidazole derivatives is reported. The reactions were catalyzed by ZnO/MgO containing ZnO nanoparticles as a highly effective, non-toxic and environmentally friendly catalyst. The structure of synthesized benzimidazoles was characterized using spectroscopic technics (FT-IR, (HNMR)-H-1, (CNMR)-C-13). Synthesized compounds were evaluated for their alpha-glucosidase inhibitory potential. Compounds 3c, 3e, 3l and 4n were potent inhibitors with IC50 values ranging from 60.7 to 168.4 mu M. In silica studies were performed to explore the binding modes and interactions between enzyme and synthesized benzimidazoles. Developed linear QSAR model based on density and molecular weight could predict bioactivity of newly synthesized compounds well. Molecular docking studies revealed the availability of some hydrophobic interactions. In addition, the bioactivity of most potent compounds had good correlation with estimated free energy of binding (Delta G(binding)) which was calculated according to docked best conformations. (C) 2016 Elsevier B.V. All rights reserved.
Mild and Efficient Synthesis of Benzimidazole Using Lead Peroxide Under Solvent-Free Conditions
作者:Vishvanath D. Patil、Jaymala Patil、Priyanka Rege、Ganesh Dere
DOI:10.1080/00397910903531789
日期:2010.12.21
Benzimidazole derivatives have been synthesized using a catalytic amount of lead peroxide (PbO2) at room temperature with excellent yields. The remarkable selectivities under mild, neutral and solvent-free conditions and use of a commercially available, inexpensive catalyst are attractive features of this method.