19658-59-4Relevant academic research and scientific papers
Dual role of Rh(III) catalyst enables regioselective halogenation of (electron-rich) heterocycles
Schr?der, Nils,Lied, Fabian,Glorius, Frank
supporting information, p. 1448 - 1451 (2015/02/19)
The Rh(III)-catalyzed selective bromination and iodination of electron-rich heterocycles is reported. Kinetic investigations show that Rh plays a dual role in the bromination, catalyzing the directed halogenation and preventing the inherent halogenation of these substrates. As a result, this method gives highly selective access to valuable halogenated heterocycles with regiochemistry complementary to those obtained using uncatalyzed approaches, which rely on the inherent reactivity of these classes of substrates. Furans, thiophenes, benzothiophenes, pyrazoles, quinolones, and chromones can be applied.
Synthesis of 5-ethyl-8-oxo-5.8-dihydro-1,3-dioxolo [4,5-g] quinolines and related compounds
Pednekar, Suhas,Pandey, Anil Kumar
, p. 357 - 360 (2011/12/16)
Condensation of N-ethyl-3,4-methylenedioxyaniline 1 with diethyl ethoxymethylenemalonate 2 gave the unsaturated ester 3 which on thermal cyclization in refluxing diphenyl oxide gave ester 4. The ester on basic hydrolysis formed free acid 5 which upon treatment with thionyl chloride gave the acid chloride 6. Treatment of 6 with o-phenylenediamine, hydrazine hydrate, ammonia, urea and thiourea gave the amides (7-11). CS2 treatment in presence of KOH on 8 gave 12. 7-12 were prepared by conventional as well as under microwave irradiation. These compounds have been characterized on the basis of elemental analysis, IR, NMR and MS data.
Microwave-assisted synthesis of quinolone derivatives and related compounds
Pednekar, Suhas,Pandey, Anil Kumar
experimental part, p. 1104 - 1108 (2010/11/03)
(Chemical Equation Presented) The Gould-Jacob type of reaction for the synthesis of ethyl 5-ethyl-8-oxo-5,8-dihydro-[1,3]-dioxolo[ 4,5-g]quinoline-7- carboxylate 4 has been carried out conventionally by the condensation between N-ethyl-3,4-methylenedioxyaniline 1 and diethyl ethoxymethylenemalonate 2 gave the unsaturated ester 3 and thermal cyclization in refluxing diphenyl oxide gave quinolone ethyl ester 4 and the results obtained were compared with single step microwave irradiation under solvent free conditions for the synthesis of 4. The esters on basic hydrolysis formed free acid 5, which, upon treatment with thionyl chloride gave the acid chloride 6. Treatment of acid chloride with o-phenylenediamine, hydrazine hydrate, ammonia, urea, and thiourea gave the amides (7-11). CS2 treatment in presence of KOH on 8 gave 12. We prepared 7-12 derivatives by conventional as well as microwave irradiation. These compounds have been characterized on the basis of IR, 1H NMR, MS, and elemental analysis. All the compounds prepared herein were screened for their antibacterial activity. Compounds 4, 5 possess promising antibacterial activity and compound 8 showed significant antibacterial activity.
Synthese et activite biologique de prodrogues de l'acide oxolinique
Loubinoux, B,Colin, JL,Thomas, V
, p. 461 - 467 (2007/10/02)
Synthesis and biological activities of oxolinic acid pro-drugs.Antiseptic phenols, anti-inflammatory acids and polyethyleneglycol moieties have been attached by labile bonds to oxolinic acid giving pro-drugs with anti-bacterial activities.Some of them are more soluble in water, exhibit a more sustained action in the time and give higher plasma and tissue concentrations compared with the free drug.
