- Synthesis, crystal structure and antibacterial activity of new highly functionalized ionic compounds based on the imidazole nucleus
-
Several new highly functionalized imidazolium derivatives were synthesized, via appropriate synthetic routes, using imidazole, 1-methylimidazole and 2-phenyl-1-methylimidazole as key intermediates. The antibacterial activity of the prepared compounds was evaluated against: Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella thipymurium using disk-diffusion and MIC methods. Crystal X-ray structures are reported for six compounds.
- Bahnous, Mebarek,Bouraiou, Abdelmalek,Chelghoum, Meryem,Bouacida, Sofiane,Roisnel, Thierry,Smati, Farida,Bentchouala, Chafia,Gros, Philippe C.,Belfaitah, Ali
-
p. 1274 - 1278
(2013/03/14)
-
- External preparation for skin diseases containing nitroimidazole
-
An external preparation for skin disease which comprises a nitroimidazole derivative represented by the following formula (I): wherein R1, R3 and R4 may be the same or different and represent a hydrogen atom, a nitro group, a lower alkyl group, a substituted lower alkyl group, a lower alkenyl group, or a substituted lower alkenyl group; and R2 represents a hydrogen atom, a lower alkyl group, a substituted lower alkyl group and a lower alkenyl group or a substituted lower alkenyl group, provided that any one of R1, R3 and R4 is a nitro group.
- -
-
-
- Oxidative decarbonylation of β-arylpyruvic acids using sodium perborate
-
Oxidation of β-aryl- and β-heteroarylpyruvic acids using sodium perborate tetrahydrate (SPB) in aqueous solution at ambient temperature gives the corresponding arylacetic acids in good yield (68-86%). The mild conditions are convenient for the preparation of thermally unstable acids. In particular the method has been applied to the preparation of an unstable 5- nitroimidazol-2-yl ethanoic acid which could not be obtained using other reagents apparently due to enolisation of the pyruvic acid precursor. Attempts to achieve decarbonylation using calcium hypochlorite or SPB in acidic solution lead to the 2 chloromethyl derivatives. The novel 5- nitroimidazol-2-yl ethanoic acid, which was required as a precursor of molecules of biological interest, has been fully characterised and converted to a known amide. Reaction of this acid with Vilsmeier's reagent gave an enamine derivative and not the expected vinamidinium salt. This novel mode of reaction is attributable to intramolecular hydrogen-bonding and favourable conjugation.
- Morrow, Nicholas,Ramsden, Christopher A.,Sargent, Bruce J.,Wallett, Christiaan D.
-
p. 9603 - 9612
(2007/10/03)
-
- A novel decarbonylation of heterocyclic pyruvic acid derivatives using sodium perborate
-
Decarbonylation of imidazo-2-yl and pyrid-2-ylpyruvic acids giving the corresponding acetic acids has been achieved using aqueous sodium perborate at room temperature. It is proposed that intramolecular hydrogen bonding, which inhibits conventional decarbonylation, facilitates epoxidation and subsequent decarboxylation of the enol tautomers.
- Ramsden, Christopher A.,Sargent, Bruce J.,Walle, Christiaan D.
-
p. 1901 - 1904
(2007/10/03)
-
- Reduction of Substituted Nitro Compounds with Tri-n-butyltin Hydride
-
α-Substituted nitro compounds have been reduced with tri-n-butyltin hydride to give replacement of the α-substituent by hydrogen (2-bromo, 2-chloro- and 2-nitro-2-phenylsulphonylpropane to 2-nitropropane; p-nitrobenzyl chloride, bromide, iodide and thiocyanate to p-nitrotoluene; 5-nitrofurfuryl nitrate to 2-methyl-5-nitrofuran and 2-hydroxymethyl-5-nitrofuran; 2-(bromomethyl)-1-methyl-5-nitroimidazole to 1,2-dimethylimidazole). 2-Bromo-2-nitrohept-6-ene and 1-bromo-1-nitrohex-5-ene were reduced to 2-nitrohept-6-ene and 1-nitrohex-5-ene,5-bromo- and 5-phenylsulphonyl-5-nitro-6-phenyl-norborn-6-ene to 5-nitro-6-phenylnorborn-6-ene and 2-iodo-2-nitro-3-(endo-norborn-2-en-5-yl)propane to 2-nitro-3-(endo-norborn-2-en-5-yl)propane without cyclisation of the intermediate alkenyl α-nitroalkyl radicals. 2-Bromo-2-nitrohex-5-ene and 1-bromo-1-nitropent-4-ene were reduced to the respective nitroalkenes at high but at lower cyclisation to 1-methyl-1-nitrocyclopentane and 1-nitrocyclopentane took place.Inhibition studies of the reductions of 2-bromo-2-nitrohex-5-ene and p-nitrobenzyl bromide showed a radical chain mechanism.In some of the reductions at low , radical rearrangement of the intermediate α-nitroalkyl radicals gave the respective ketones.Mechanisms involving (a) addition/elimination and (b) dissociation of intermediate radical anions, are proposed.
- Bowman, W. Russell,Crosby, David,Westlake, Paul J.
-
-
- Process for formulating a synthetic drug for use in animal feed, and resulting formulation
-
A method of formulating a synthetic drug for use in animal feed, for the purpose of reducing carry-over of the synthetic drug to subsequent lots of animal feed in the feed mill.
- -
-
-
- Production of 1-alkyl-5-nitroimidazoles
-
1-Alkyl-5-nitroimidazoles are prepared by reacting a 5-nitroimidazole with an alkylating agent in the presence of an aliphatic carboxylic acid. The products are intermediates for the production of dyes, textiles auxiliaries and insecticides.
- -
-
-
- Method for promoting growth of poultry with 3-(5-nitro-2-imidazolyl)pyrazoles
-
There are disclosed novel 3-(5-nitro-2-imidazolyl)-pyrazoles exhibiting utility as antibacterial, antiprotozoal, and antifungal agents, making the compounds useful particularly in veterinary medicine, especially in controlling bacterial and protozoal infections of cattle, swine, and poultry. The compounds are also active as growth promoters in chickens.
- -
-
-