- Design, synthesis, biological evaluation of substituted benzofurans as DNA gyraseB inhibitors of Mycobacterium tuberculosis
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DNA gyrase of Mycobacterium tuberculosis (MTB) is a type II topoisomerase and is a well-established and validated target for the development of novel therapeutics. By adapting the medium throughput screening approach, we present the discovery and optimization of ethyl 5-(piperazin-1-yl) benzofuran-2- carboxylate series of mycobacterial DNA gyraseB inhibitors, selected from Birla Institute of Technology and Science (BITS) database chemical library of about 3000 molecules. These compounds were tested for their biological activity; the compound 22 emerged as the most active potent lead with an IC50 of 3.2 ± 0.15 μM against Mycobacterium smegmatis DNA gyraseB enzyme and 0.81 ± 0.24 μM in MTB supercoiling activity. Subsequently, the binding of the most active compound to the DNA gyraseB enzyme and its thermal stability was further characterized using differential scanning fluorimetry method.
- Renuka, Janupally,Reddy, Kummetha Indrasena,Srihari, Konduri,Jeankumar, Variam Ullas,Shravan, Morla,Sridevi, Jonnalagadda Padma,Yogeeswari, Perumal,Babu, Kondra Sudhakar,Sriram, Dharmarajan
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- Synthetic method for vilazodone intermediate ethyl 5-(1-piperazinyl)-2-benzofuran-2-carboxylate
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The invention relates to a synthetic method for a vilazodone intermediate, i.e., ethyl 5-(1-piperazinyl)-2-benzofuran-2-carboxylate. The key vilazodone intermediate ethyl 5-(1-piperazinyl)-2-benzofuran-2-carboxylate as shown in a formula I is prepared with 6-nitrocoumarin as a starting raw material through addition, ring opening, intramolecular ring closure, nitro reduction, piperazine ring preparation, etc. The synthetic method is simple in synthetic route, high in the yield of target products and suitable for industrial scale-up production.
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- [...] intermediate synthetic method (by machine translation)
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The invention relates to a [...] intermediate synthesis method, in order to 6 - nitro coumarin as the starting the raw materials, through ring-opening, the ring in the molecule, esterification, reduction, paipai qin link other steps, to obtain key [...] middle style I compound 5 - (1 - piperazinyl) - 2 - benzofuran - 2 - carboxylic acid ethyl ester. The invention synthetic route is simple, the target product yield is relatively high, and is suitable for industrial scale production. (by machine translation)
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- A 5 - (piperazin-1-yl) benzofuran-2-carboxylic acid ethyl ester synthesis method
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The invention discloses a synthesis method of 5-(piperazin-1-yl) benzofuran-2-carboxylic acid ethyl ester. The synthesis method comprises the following steps: (1) under the protection of nitrogen, adding zinc powder and tetrahydrofuran to a reactor, dropwise adding TiCl4, adding 2-hydroxyl-5-(piperazin-1-yl) benzaldehyden and glyoxal, and rectifying to obtain 3-[2-hydroxyl-5-(piperazin-1-yl)] phenyl-2-acrylic aldehyde; (2) adding a sodium hydroxide solution and a copper sulfate solution to the reactor, and adding the 3-[2-hydroxyl-5-(piperazin-1-yl)] phenyl-2-acrylic aldehyde while stirring to obtain 3-[2-hydroxyl-5-(piperazin-1-yl)] phenyl-2-acrylic acid; (3) dissolving the 3-[2-hydroxyl-5-(piperazin-1-yl)] phenyl-2-acrylic acid in absolute ethyl alcohol and adding to the reactor, and adding tetrahydrofuran and anhydrous potassium carbonate to obtain the 5-(piperazin-1-yl) benzofuran-2-carboxylic acid ethyl ester. The synthesis route disclosed by the invention is wide in raw material source, simple to operate and outstanding in advantage.
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- A PROCESS FOR PREPARATION OF 2-BENZOFURANCARBOXAMIDE, 5-[4-[4-(5CYANO-1H-INDOL-3-YL)BUTYL]-1-PIPERAZINYL] FREE BASE AND ITS HYDROCHLORIDE SALT
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The present invention describes an advantageous, economically viable process for preparing 5-[4-[4-(5-Cyanoindole-3-yl)butyl]Piperazine-1-yl]benzofuran-2-carboxamide free base (Formula-I) and its hydrochloride salt. The instant invention also describes process for preparing 2-benzofurancarboxamide, 5-[4-[4-(5cyano-1H-indol-3-yl)butyl]-1- piperazinyl]intermediates.
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Page/Page column 20
(2016/09/22)
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- [...] intermediate and its salt synthesis method
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The invention relates to a synthesis method of a vilazodone intermediate 5-(4-[4-(5-cyano-3-indyl)-butyl]-1-piperazinyl)benzofuran-2-carboxylic acid ethyl ester and a salt thereof, belonging to the technical field of drug synthesis. The synthesis method comprises the following steps of: dissolving 3-(4-chlorobutyl)-5-cyanoindole and a catalyst into an inorganic water solution under the protection of nitrogen gas, carrying out heating reflux, stirring, then, adding 5-(piperazinyl-1-yl)benzofuran-2-carboxylic acid ethyl ester and alkaline, reacting at the temperature of 80-110 DEG C for 4-6h, slowly pouring an aqueous alkaline solution while stirring at room temperature until a solid is separated out, and then, carrying out after-treatment to obtain the 5-(4-[4-(5-cyano-3-indyl)-butyl]-1-piperazinyl)benzofuran-2-carboxylic acid ethyl ester. The synthesis method is low in production cost, environment-friendly, high in operation safety, high in product yield and purity, good in quality and suitable for large-scale industrial production.
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- An efficient synthesis and biological screening of benzofuran and benzo[d]isothiazole derivatives for Mycobacterium tuberculosis DNA GyrB inhibition
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A series of twenty eight molecules of ethyl 5-(piperazin-1-yl)benzofuran-2-carboxylate and 3-(piperazin-1-yl)benzo[d]isothiazole were designed by molecular hybridization of thiazole aminopiperidine core and carbamide side chain in eight steps and were screened for their in vitro Mycobacterium smegmatis (MS) GyrB ATPase assay, Mycobacterium tuberculosis (MTB) DNA gyrase super coiling assay, antitubercular activity, cytotoxicity and protein-inhibitor interaction assay through differential scanning fluorimetry. Also the orientation and the ligand-protein interactions of the top hit molecules with MS DNA gyrase B subunit active site were investigated applying extra precision mode (XP) of Glide. Among the compounds studied, 4-(benzo[d]isothiazol-3-yl)-N-(4-chlorophenyl)piperazine-1-carboxamide (26) was found to be the most promising inhibitor with an MS GyrB IC50 of 1.77 ± 0.23 μM, 0.42 ± 0.23 against MTB DNA gyrase, MTB MIC of 3.64 μM, and was not cytotoxic in eukaryotic cells at 100 μM. Moreover the interaction of protein-ligand complex was stable and showed a positive shift of 3.5 °C in differential scanning fluorimetric evaluations.
- Reddy, Kummetha Indrasena,Srihari, Konduri,Renuka, Janupally,Sree, Komanduri Shruthi,Chuppala, Aruna,Jeankumar, Variam Ullas,Sridevi, Jonnalagadda Padma,Babu, Kondra Sudhakar,Yogeeswari, Perumal,Sriram, Dharmarajan
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p. 6552 - 6563
(2015/02/18)
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