- Preparation method 2 - (4 -hydroxy -2 - oxo -1 - pyrrolidinyl) acetamide (by machine translation)
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The invention relates to the field, organic synthesis and medicine technology. In particular, the invention provides a method for preparing 2 - (4 -hydroxy -2 - oxo -1 - pyrrolidinyl) acetamide, which uses methyl 4 - chloroacetoacetate as a starting material, condenses, crystallizes and crystallizes after carbonyl reduction to obtain a target product, and the total yield is approximately unitz 90% is left and right. The method optimizes the reaction steps by improving the synthesis route, namely the 2 - (4 - hydroxyl -2 - oxo -1 - pyrrolidinyl) acetamide, and shortens the production cycle, and shortens the production cycle. The production cost, as well as the emission. The method is cheap and easy to obtain, simple and convenient to operate, low in impurities, high in yield, and particularly suitable for industrial production. (by machine translation)
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Paragraph 0030; 0032; 0033; 0037; 0039; 0040
(2019/07/29)
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- A heterogenized cobaltate catalyst on a bis-imidazolium-based covalent triazine framework for hydroesterification of epoxides
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An imidazolium-cobaltate-based heterogeneous catalyst exhibits advantages over its homogeneous counterpart in the synthesis of β-hydroxyesters from epoxides. However, leaching of cobaltate from the catalytic support decreases the selectivity and recyclability of the catalyst. To overcome such drawbacks, a bis-imidazolium-based covalent triazine framework (CTF) is employed as a catalytic support for the hydroesterification catalyst to reduce cobaltate leaching by the intramolecular anion stabilization effect of the multi-imidazolium moiety, resulting in an excellent selectivity for the β-hydroxyester and unprecedented recyclability.
- Rajendiran, Senkuttuvan,Gunasekar, Gunniya Hariyanandam,Yoon, Sungho
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supporting information
p. 12256 - 12262
(2018/07/24)
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- Reduction processes biocatalyzed by Vigna unguiculata
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Whole cells from the Brazilian beans feijao de corda (Vigna unguiculata) have been employed as biocatalysts in different bioreduction processes. Good to excellent selectivities can be obtained in the reduction of aromatic and aliphatic ketones, as well as β-ketoesters, depending on the conversions and the chemoselectivity on the substrate structure. This biocatalyst was also able to reduce the nitro moiety of different aromatic nitro compounds, showing as well enoate reductase activity, and chemoselectively catalyzing the double bond reduction of 4-phenyl-3-buten-2-one with moderate conversion.
- Bizerra, Ayla M.C.,Gonzalo, Gonzalo de,Lavandera, Ivan,Gotor-Fernandez, Vicente,de Mattos, Marcos Carlos,de Oliveira, Maria da Conceicao F.,Lemos, Telma L.G.,Gotor, Vicente
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experimental part
p. 566 - 570
(2010/08/06)
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- Biocatalytic cascade for the synthesis of enantiopure β-azidoalcohols and β-hydroxynitriles
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A three-step, two-enzyme, one-pot reaction sequence starting from prochiral a-chloroketones leading to enantiopure (3- azidoalcohols and (3-hydroxynitriles is described. Asymmetric bioreduction of a-chloroketones by hydrogen transfer catalysed by an alcohol dehydrogenase (ADH) established the stereogenic centre in the first step to furnish enantiopure chlorohydrin intermediates. Subsequent biocatalysed ring closure to the epoxide and nucleophilic ring opening with azide, N3-, or cyanide, CN-, both catalysed by a nonselective halohydrin dehalogenase (Hhe) proceeded with full retention of configuration to give enantiopure (-azidoalcohols and (3-hydroxynitriles, respectively. Both enantiomers of various optically pure (-azidoalcohols and (-hydroxynitriles were synthesised.
- Schrittwieser, Joerg H.,Lavandera, Ivan,Seisser, Birgit,Mautner, Barbara,Kroutil, Wolfgang
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supporting information; experimental part
p. 2293 - 2298
(2009/08/17)
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- Carbonylative ring opening of terminal epoxides at atmospheric pressure
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(Chemical Equation Presented) The carbonylative opening of terminal epoxides under mild conditions has been developed using Co2-(CO) 8 as the catalyst. Under 1 atm of carbon monoxide and at room temperature in methanol, propylene oxide is converted to methyl 3-hydroxybutanoate in up to 89% yield. This transformation is general for many terminal epoxides bearing alkyl, alkenyl, aryl, alkoxy, chloromethyl, phthalimido, and acetal functional groups. The opening takes place without epimerization at the secondary stereocenter.
- Denmark, Scott E.,Ahmad, Moballigh
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p. 9630 - 9634
(2008/03/17)
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- Sequential kinetic resolution catalyzed by halohydrin dehalogenase
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(Chemical Equation Presented) A sequential kinetic resolution catalyzed by halohydrin dehalogenase was employed for the synthesis of two valuable enantiopure building blocks. Resolution of methyl 4-chloro-3-hydroxybutanoate methylester ((R,S)-2) with use of a Trp249Phe mutant of halohydrin dehalogenase yielded methyl 4-cyano-3-hydroxybutanoate methylester ((S)-4) with 96.8% ee (40% yield) and (S)-2 with 95.2% ee (41% yield). This reaction is carried out in aqueous solution under mild conditions and provides access to a useful statin side-chain building block.
- Elenkov, Maja Majeric,Tang, Lixia,Hauer, Bernhard,Janssen, Dick B.
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p. 4227 - 4229
(2007/10/03)
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- Process for preparing malonate derivatives or beta -keto esters from epoxide derivatives
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A process for preparing a malonic acid monoester or β-ketoester from an epoxide includes the steps of reacting an epoxide with carbon monoxide and an alcohol in the presence of a catalytic amount of a cobalt compound and at least one promoter to produce a β-hydroxyester, separating the β-hydroxyester from the cobalt compound and the promoter, and oxidizing the β-hydroxyester to produce a malonic acid monoester or β-ketoester.
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- Process for preparing 1,3-alkanediol from epoxide derivative
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A process for preparing an 1,3-alkanediol through carbonylation of an epoxide derivative includes the steps of (a) reacting an epoxide derivative with alcohol and carbon monoxide in a solvent at a temperature from about 30 to about 150° C. and at a pressure from about 50 to about 3000 psig in the presence of a catalyst system including an effective amount of a cobalt catalyst and an effective amount of a promoter to afford a reaction mixture including a 3-hydroxyester or derivative thereof in an amount of from 2 to about 95% by weight, (b) separating the reaction product and solvent from the catalyst and promoter, (c) reacting said reaction product and solvent with hydrogen at a temperature from about 30 to about 350° C. and at a pressure from about 50 to about 5000 psig in the presence of a catalyst system for hydrogenation to prepare a hydrogenation product mixture including a 1,3-alkanediol, and (d) recovering the 1,3-alkanediol from the hydrogenation product mixture. Catalyst systems for carrying out the inventive processes are also provided.
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Page column 9
(2008/06/13)
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- A NEW CHIRAL HOST COMPOUND 10,10'-DIHYDROXY-9,9'-BIPHENANTHRYL. OPTICAL RESOLUTION OF PROPIONIC ACID DERIVATIVES, BUTYRIC ACID DERIVATIVES, AND 4-HYDROXYCYCLOPENT-2-EN-1-ONE DERIVATIVES BY COMPLEXATION
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Optically active 10,10'-dihydroxy-9,9'-biphenanthryl was designed as a new chiral host compound for optical resolution of guest compounds, and was found to be wery effective for resolution of the title guest compounds.
- Toda, Fumio,Tanaka, Koichi
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p. 1807 - 1810
(2007/10/02)
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