A facile and “Green” synthesis of 2-substituted benzimidazoles
Benzimidazole has been prepared from o-phenylenediamine by the action of chloroform and alcoholic potassium hydroxide 1 and of formic acid, 2 and by the reduction of o-nitroformanilide. 3 Less serviceable methods include the interaction of o-phenylenediamine and dichloromethylformamidine, 4 or diphenylformamidine, 5 or formoacetic anhydride, 6 and the thermal decarboxylation of benzimidazole …... Benzimidazole and o-phenylenediamine were used as scaffolds for the attachment of phenolic hydroxy and basic guanidino groups present in HN, the benzene ring of Phe 15 in HN being comprised in the structures of these support
Benzimidazole or Diamide From a Reaction of Diamines and
AbstractA simple and efficient protocol for preparing benzimidazoles via Fe(NO3)3 · 9H2O-catalyzed aerobic oxidation reaction of imine derivatives with o-phenylenediamine. This process uses air as an economical and green oxidant, tolerates a wide range of substrates, and affords the targeted benzimidazoles in moderate to excellent yields.... o-Phenylenediamine and various carbonyl compounds, in the presence of ammonium chloride as a catalyst. Ammonium chloride is a commercial and environmentally benign catalyst. The yield of all benzimidazole
synthesis of benzimidazole from o-phenylenediamine and
After successfully synthesizing a series of 2-aryl-1H-benzimidazole derivatives in excellent yields in the presence of VB 1 as catalyst, we turned our attention to the synthesis of 2-aryl-1-arylmethyl-1H-benzimidazoles 4 by condensation of o-phenylenediamine 1 …... A review on chemistry and biological... 30 A number of hydrogenated benzimidazoles have been prepared also by chemical methods. Hexahydro-2(3H)-benzimidazolone may be obtained by the reaction between hexahydro-o-phenylenediamine and phosgene in
Benzimidazoles Filtration Crystallization
Hình ảnh cho synthesis of benzimidazole from o-phenylenediamine and formic acid=synthesis of benzimidazole from o-phenylenediamine and formic acid In a 500-cc. round-bottomed flask 54 g. (0.5 mole) of o-phenylenediamine (Note 1) is treated with 32 cc. (34.6 g.) of …... Various catalyzed synthesis of benzimidazole derivatives are known condensation of o-phenylenediamine with ortho esters in the presence of various lewis acid catalyst is also known such as ZrCl 4, SnCl 4, TiCl 4, ZrOCl 2 ·9H 2 O and HFCl 4.
Synthesis Of Benzimidazole From O Phenylenediamine Pdf
Synthesis of Benzimidazoles via Iron-Catalyzed Aerobic
- Synthesis of benzimidazole from o-phenylenediamine
- Synthesis of some benzimidazole benzoxazole and
- BENZIMIDAZOLE STUDIES. I. THE MECHANISM OF BENZIMIDAZOLE
- An expeditious one-pot solvent free synthesis of
Synthesis Of Benzimidazole From O Phenylenediamine Pdf
An improved and greener protocol for the synthesis of benzimidazole derivatives, starting from o-phenylenediamine, with different aldehydes is reported.
- The Synthesis and Chemistry of Certain Anthelmintic Benzimidazoles LB. Townsend and D.S. Wise A basis for interest in the benzimidazole ring system as a nucleus from which to develop potential chemotherapeutic agents was established in the I95Os when it was found that 5,6-dimethyl- I - (a-D-ribofiranosyljbenzimidazole (I) was an integral part ofthe structure of vitamin 6,~ As a result of these
- AbstractA simple and efficient protocol for preparing benzimidazoles via Fe(NO3)3 · 9H2O-catalyzed aerobic oxidation reaction of imine derivatives with o-phenylenediamine. This process uses air as an economical and green oxidant, tolerates a wide range of substrates, and affords the targeted benzimidazoles in moderate to excellent yields.
- o-phenylenediamines react with (a) carboxylic acids and their derivatives, (b) imino-ethers (c) carbonyl compounds and (d) nitriles to yield differently substituted benzimidazoles.
- Supporting information Cyclization of o-Phenylenediamines by CO 2 in the presence of H 2 to the Synthesis of Benzimidazoles Bo Yu, Hongye Zhang, Yanfei Zhao, Sha Chen, Jilei Xu, Changliang Huang, Zhimin Liu*
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