2264-12-2Relevant articles and documents
Computational studies of 1,2-disubstituted benzimidazole derivatives
Jayabharathi,Thanikachalam,Jayamoorthy,Venkatesh Perumal
, p. 131 - 136 (2012)
Some 1,2-disubstituted benzimidazole derivatives (1-6) have been synthesized and characterized by mass, 1H, 13C NMR and elemental analysis. XRD analysis was carried out for 1-(4-methylbenzyl)-2-p- tolyl-1H-benzo[d]imidazole. Calculat
Synthesis, spectral studies and solvatochromism of some novel benzimidazole derivatives-ESIPT process
Jayabharathi,Thanikachalam,Jayamoorthy,Srinivasan
, p. 223 - 228 (2013)
Some novel benzimidazole derivatives were synthesized and characterized by 1H, 13C NMR mass and elemental analysis. XRD analysis was carried out for 1-(4-methylbenzyl)-2-p-tolyl-1H-benzo[d]imidazole. The solvent effect on the absorpt
A facile and highly chemoselective synthesis of 1,2-disubstituted benzimidazoles using hierarchical nanoporous material
Senthilkumar, Samuthirarajan,Kumarraja, Mayilvasagam
, p. 1971 - 1974 (2014)
A highly ordered nanoporous aluminosilicate (MMZY) is prepared and employed as a catalyst for the synthesis of benzimidazoles from 1,2-diaminobenzene and aromatic aldehydes. In all the cases, the reactions are highly chemoselective and afford 1,2-disubstituted benzimidazoles in excellent yield. The catalyst was characterized by electron microscopy and X-ray methods and its other advantages like functional tolerance, mildness of the reaction conditions, easy separation, and reusability are also highlighted.
Effective fluorescent chemosensors for the detection of Zn2+ metal ion
Jayabharathi,Thanikachalam,Jayamoorthy
, p. 143 - 147 (2012)
Benzimidazole derivatives synthesized from three components assembling condensation reaction behaves as a selective fluorescent sensor for Zn 2+ metal ion. These benzimidazole derivatives were characterized by 1H, 13C NMR,
An efficient facile and one-pot synthesis of benzodiazepines and chemoselective 1,2-disubstituted benzimidazoles using a magnetically retrievable Fe3O4 nanocatalyst under solvent free conditions
Jamatia, Ramen,Saha, Mithu,Pal, Amarta Kumar
, p. 12826 - 12833 (2014)
Benzodiazepine and chemoselective 1,2-disubstituted benzimidazole derivatives were synthesized by the condensation reaction of o-phenylenediamine with ketones and aryl aldehydes using Fe3O4 nanoparticles as a recyclable catalyst unde
Water extract of onion catalyst: An economical green route for the synthesis of 2-substituted and 1,2-disubstituted benzimidazole derivatives with high selectivity
Kaliyan, Prabakaran,Selvaraj, Loganathan,Muthu, Seenivasa Perumal
supporting information, p. 340 - 349 (2020/12/01)
An efficient, environmental friendly and substrate controlled method of synthesis of 2-substituted benzimidazole derivatives 3 and 1,2-disubstituted benzimidazole derivatives 4 with high selectivity has been achieved from the reaction of o-phenylenediamine 1 and aldehydes 2 in the presence of water extract of onion and selecting suitable reaction medium. This method is widely applicable for variety of aldehydes such as aromatic/aliphatic/heterocyclic aldehydes and 1,2-diamines to afford 2-substituted benzimidazole derivatives 3 and 1,2-disubstituted benzimidazole derivatives 4 in good to excellent yields (up to 96%). The developed method of water extract of onion catalysis produced 2-substituted benzimidazoles 3 from aromatic aldehydes having electron-withdrawing groups, whereas aromatic aldehydes bearing electron donating groups selectively furnished 1,2-disubstituted benzimidazole 4 derivatives. The process described here has several advantages of cheap, low energy consumption, commercially available starting materials, operational simplicity and nontoxic catalyst. The use of water extract of onion makes this present methodology green and giving a useful contribution to the existing methods available for the preparation of benzimidazole derivatives. In addition, Hammett correlation of substituent constant (σ) vs percentage (%) yield has been established.
Nickel catalyzed sustainable synthesis of benzazoles and purines: Via acceptorless dehydrogenative coupling and borrowing hydrogen approach
Chakraborty, Gargi,Guin, Amit Kumar,Mondal, Rakesh,Paul, Nanda
, p. 7217 - 7233 (2021/08/30)
Herein we report nickel-catalyzed sustainable synthesis of a few chosen five-membered fused nitrogen heterocycles such as benzimidazole, purine, benzothiazole, and benzoxazole via acceptorless dehydrogenative functionalization of alcohols. Using a bench stable, easy to prepare, and inexpensive Ni(ii)-catalyst, [Ni(MeTAA)] (1a), featuring a tetraaza macrocyclic ligand (tetramethyltetraaza[14]annulene (MeTAA)), a wide variety of polysubstituted benzimidazole, purine, benzothiazole, and benzoxazole derivatives were prepared via dehydrogenative coupling of alcohols with 1,2-diaminobenzene, 4,5-diaminopyrimidine, 2-aminothiphenol, and 2-aminophenol, respectively. A wide array of benzimidazoles were also prepared via a borrowing hydrogen approach involving alcohols as hydrogen donors and 2-nitroanilines as hydrogen acceptors. A few control experiments were performed to understand the reaction mechanism.
Natural dolomitic limestone-catalyzed synthesis of benzimidazoles, dihydropyrimidinones, and highly substituted pyridines under ultrasound irradiation
Godugu, Kumar,Gundala, Trivikram Reddy,Mohinuddin Pinjari, Mohammad Khaja,Reddy Nallagondu, Chinna Gangi,Sanapareddy, Lakshmi Reddy,Sri Yadala, Venkata Divya
supporting information, p. 1881 - 1900 (2020/10/02)
Natural dolomitic limestone (NDL) is employed as a heterogeneous green catalyst for the synthesis of medicinally valuable benzimidazoles, dihydropyrimidinones, and highly functionalized pyridines via C–N, C–C, and C–S bond formations in a mixture of ethan