- Method for preparing carboxylic acid by one-pot method
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The invention discloses a method for preparing carboxylic acid by a one-pot method, which comprises the steps of carrying out a Corey-Fuchs process on 1,1-dibromo olefin under the action of n-butyllithium, reacting with isopropanol pinacol borate, quenching with hydrogen chloride, oxidizing with an oxidant, separating and purifying to obtain carboxylic acid. The method disclosed by the invention is a one-pot preparation method, is simple and convenient to operate, does not need to use metal catalysis, uses cheap and easily available reagents for reaction, is green and environment-friendly, hasmild reaction conditions and wide substrate applicability, and provides a new way for rapidly preparing a series of carboxylic acids containing different functional groups.
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Paragraph 0041-0045
(2021/01/29)
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- Synthetic method of benzofuranone
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The invention provides a synthetic method of benzofuranone. According to the method, o-cresol which is relatively easy to obtain is used as an initial raw material, and the target product benzofuranone is prepared through four-step reaction; and the whole preparation process is mild in condition, high in yield, easy to operate, small in environmental pollution and suitable for large-scale industrial production.
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- Methoxyphenylacetic acid, intermediate thereof, and preparation method of salt thereof
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The invention discloses methoxyphenylacetic acid, an intermediate thereof, and a preparation method of a salt thereof. The invention provides a preparation method of hydroxyl phenylacetate, wherein the method may be a method (1) or a method (2). The method has high yield, high purity, simple operation process, mild reaction conditions, short reaction time and low demand on equipment. A catalyst in the method is recyclable, so that the method has simple post-treatment. The method is environment-friendly, is low in production cost and is suitable for industrial production.
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Paragraph 0162; 0163
(2017/08/28)
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- Bimane: A Visible Light Induced Fluorescent Photoremovable Protecting Group for the Single and Dual Release of Carboxylic and Amino Acids
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A series of ester conjugates of carboxylic and amino acids were synthesized based on bimane fluorescent photoremovable protecting group (FPRPG). The photorelease of single and dual (same as well as different) carboxylic and amino acids is demonstrated from a single bimane molecule on irradiation with visible light (λ ≥ 410 nm). The detailed mechanistic study of photorelease revealed that the release of two caged acids is simultaneous but in a stepwise pathway.
- Chaudhuri, Amrita,Venkatesh, Yarra,Behara, Krishna Kalyani,Singh, N. D. Pradeep
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supporting information
p. 1598 - 1601
(2017/04/13)
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- Photocaging of Single and Dual (Similar or Different) Carboxylic and Amino Acids by Acetyl Carbazole and its Application as Dual Drug Delivery in Cancer Therapy
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A new fluorescent photoremovable protecting group (FPRPG) based on acetylcarbazole framework has been explored for the first time release of single and dual (similar or different) substrates from single chromophore. Mechanistic studies of the photorelease process revealed that photorelease of two (similar or different) substrates from acetyl carbazole proceeds via a stepwise pathway. Further, we constructed photoresponsive dual drug delivery system (DDS) to release two different anticancer drugs (caffeic acid and chlorambucil, 1 equiv each). In vitro study reveals that our DDS exhibit excellent properties like biocompatibility, cellular uptake, and photoregulated dual drug release.
- Venkatesh, Yarra,Rajesh,Karthik,Chetan,Mandal, Mahitosh,Jana, Avijit,Singh, N.D. Pradeep
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supporting information
p. 11168 - 11175
(2016/11/28)
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- Nickel-Catalyzed Carboxylation of Benzylic C-N Bonds with CO2
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A user-friendly Ni-catalyzed reductive carboxylation of benzylic C-N bonds with CO2 is described. This procedure outperforms state-of-the-art techniques for the carboxylation of benzyl electrophiles by avoiding commonly observed parasitic pathways, such as homodimerization or β-hydride elimination, thus leading to new knowledge in cross-electrophile reactions.
- Moragas, Toni,Gaydou, Morgane,Martin, Ruben
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supporting information
p. 5053 - 5057
(2016/04/26)
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- Metal-free, catalytic regioselective oxidative conversion of vinylarenes: A mild approach to phenylacetic acid derivatives
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A new synthetic approach towards the synthesis of phenylacetic acids from aromatic alkenes has been developed for the first time under mild conditions by employing non-toxic reagents such as molecular iodine and oxone. This metal-free catalytic regioselective oxygenation of vinylarenes proceeds via tandem iodofunctionalization/de-iodination induced rearrangement.
- Kodumuri, Srujana,Peraka, Swamy,Mameda, Naresh,Chevella, Durgaiah,Banothu, Rammurthy,Nama, Narender
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p. 6719 - 6723
(2016/02/03)
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- Photogenerated α,n-didehydrotoluenes from chlorophenylacetic acids at physiological pH
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Aromatic diradicals are recognized as promising intermediates for DNA cleavage, but their formation has thus far been limited to the Bergman and Myers-Saito cycloaromatizations. We report here the phototriggered generation of all isomers of the potential DNA-cleaving α,n-didehydrotoluene diradicals at physiological pH, accomplished by the irradiation of chlorophenylacetic acids under mild conditions. The desired diradicals were formed upon photolysis of the chosen aromatic in aqueous phosphate buffer solution (pH = 7.3), with the consecutive elimination of biologically compatible chloride ion and carbon dioxide. Theoretical simulations reveal that the efficient decarboxylation of the primarily generated phenyl cations involves a previously not known diradical structure.
- Ravelli, Davide,Protti, Stefano,Fagnoni, Maurizio
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supporting information
p. 852 - 858
(2015/03/05)
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- Controlled anion migrations with a mixed metal Li/K-TMP amide: General application to benzylic metalations
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A general method is described for benzylic metalation of o-, m-, and p-substituted toluenes using a mixed metal amide base generated from BuLi/KOtBu/TMP at -78 °C in THF. The excellent selectivity achieved can be rationalized by the ability of the mixed metal amide base to facilitate an anion migration from the kinetic (o-aryl) to the benzylic metalation site. Remarkably, this controlled anion migration is achievable with catalytic amounts of TMP at -78 °C.
- Fleming, Patricia,Oshea, Donal F.
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supporting information; experimental part
p. 1698 - 1701
(2011/04/17)
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- An efficient method for one-carbon elongation of aryl aldehydes via their dibromoalkene derivatives
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Various aryl aldehydes were efficiently converted into one-carbon extended aryl acetamides or aryl acetic acids through the reaction of their dibromoalkene derivatives with pyrrolidine in the presence of water under very mild conditions.
- Huh, Dal Ho,Jeong, Ji Sang,Lee, Hee Bong,Ryu, Hoejin,Kim, Young Gyu
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p. 9925 - 9932
(2007/10/03)
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- The effect of an alkoxy group on the kinetic and thermodynamic acidity of benzene and toluene
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2-, 3- and 4-Methoxytoluene can be selectively metalated at an O-adjacent ortho position when butyllithium or tert-butyllithium in the presence of sodium (potassium) tert-butoxide or N,N,N',N'',N''-pentamethyldiethylenetriamine are employed as reagents. In contrast, lithium diisopropylamide or lithium 2,2,6,6-tetramethylpiperidide deprotonate the benzylic α-position of 2- and 3-methoxytoaluene exclusively and of 4-methoxytoluene preferentially. These relative reactivities can be rationalized by an interplay of transition state stabilizing and destabilizing forces (dipole matching and metal coordination vs. lone pair repulsion).
- Schlosser, Manfred,Maccaroni, Paola,Marzi, Elena
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p. 2763 - 2770
(2007/10/03)
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- A novel chromium trioxide catalyzed oxidation of primary alcohols to the carboxylic acids
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A novel CrO3 catalyzed oxidation of primary alcohols to the carboxylic acids is reported. The oxidation proceeds smoothly with only 1-2 mol % of CrO3 and 2.5 equivalents of H3IO6 in wet MeCN to give the carboxylic acids in excellent yield. No significant racemization is observed for alcohols with adjacent chiral centers. Secondary alcohols are cleanly oxidized to ketones.
- Zhao, Mangzhu,Li, Jing,Song, Zhiguo,Desmond, Richard,Tschaen, David M.,Grabowski, Edward J. J.,Reider, Paul J.
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p. 5323 - 5326
(2007/10/03)
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- Process for the preparation of substituted phenylacetic acid derivatives and novel intermediates
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The invention relates to novel processes for the preparation of phenyl acetic acid derivatives of the formula (I) some of which are known STR1 in which R1, R2 and R3 independently of each other each represent hydrogen, alkyl or alkoxy by ozonolysis of compounds of the formula (II) STR2 in which R4 represents hydrogen or methyl and oxidation of the reaction products obtained therefrom. The invention further relates to novel intermediates and a process for the preparation thereof.
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- Protecting Groups that can be Removed through Photochemical Electron Transfer: Mechanistic and Product Studies on Photosensitized Release of Carboxylates from Phenacyl Esters
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Photolysis of electron-donating photosensitizers in the presence of various phenacyl esters (PhCOCH2-OCOR) results in C-O bond scission leading to the formation of acetophenone (PhCOCH3) and the corresponding carboxylic acid (RCO2H). Preparative experiments showed that the carboxylic acids are generated in high or quantitative isolated yields. It is argued that this reaction is initiated by a photoinduced electron transfer from the excited state sensitizer to the phenacyl ester. The latter process forms the anion radical of the phenacyl ester which in turn undergoes rapid C-O bond scission leading to the phenacyl radical and the corresponding carboxylate anion. This mechanism is supported by the following observations. (1) The phenacyl esters quench fluorescence from the sensitizers. (2) Analysis of the redox potentials of the sensitizer excited states and the substrates shows that the proposed electron transfer step is exergonic by 15-20 kcal/mol. (3) The byproducts are indicative of the proposed ion radical intermediates. In particular N-methylaniline is detected when N4Y-dimethylaniline is used as a sensitizer. (4) Competing processes are observed in phenacyl esters whose acid components are themselves labile to single-electron transfer. For example, phenacyl 4-bromophenylacetate showed bromide elimination in competition with deprotection.
- Banerjee, Anamitro,Falvey, Daniel E.
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p. 6245 - 6251
(2007/10/03)
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- N-acyl sulfamic acid esters (or thioesters), N-acyl sulfonamides, and N-sulfonyl carbamic acid esters (or thioesters) as hypercholesterolemic agents
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The present invention is directed to compounds useful for the regulation of cholesterol of Formula I, methods for using them and pharmaceutical compositions thereof, STR1 wherein X and Y are oxygen, sulfur, or (CR'R")n wherein n is 1 to 4; R is hydrogen, alkyl, or benzyl; R1 and R2 are phenyl, substituted phenyl, naphthyl, substituted naphthyl, an aralkyl group, an alkyl chain, adamantyl, or a cycloalkyl group.
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- A Practical O2-Oxidation of Functionalized Alcohols Producing Carboxylic Acids Catalyzed by the Pd-C/Pb(OAc)2 System
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The Pd-C/Pb(OAc)2 system catalyzes selective O2-oxidation of ArCH(R)CH2OH to ArCH(R)COOH (useful intermediates for drug synthesis) in high yields without contamination of ArCOOH.The turnover number (substrate/Pd) is improved to 85 and > 1800 by recycling the catalyst and using a special reactor, respectively.Alkanols are also efficiently oxidized to alkanoic acids by the title catalyst system.
- Akada, Mitsuo,Nakano, Shinji,Sugiyama, Toshiyuki,Ichitoh, Kazumoto,Nakao, Hiroki,et al.
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p. 1511 - 1515
(2007/10/02)
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- STUDIES ON OXYGEN HETEROCYCLES PART-1 : ACID CATALYSED AND PHOTOCHEMICAL REACTIONS OF SOME ARYLDIAZOKETONES
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Trifluoroacetic acid catalysed reaction of 2-methoxyphenyldiazomethylketone (4a), 2-acetoxyphenyldiazomethylketone (4b) and 3-(2-anisyl)-α-diazo-2-propanone (11) leads to the formation of coumaranone (6) and 3-chromanone (12), while 4-(2-anisyl)-α-diazo-2-butanone (16) affords benzo-1-oxepan-3-one (17) and 5-methoxy-2-tetralone (18) in moderate yield.The photochemical decomposition of the said diazoketones (4a, 11 and 16) gave products depending on the length of the side chain present in the substrates.
- Ghosh, Somnath,Datta, Indira,Chakraborty, Rupak,Das, Tapas Kumar,Sengupta, Judhajit,Sarkar, Dipak Chandra
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p. 1441 - 1446
(2007/10/02)
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- Esters of α-Arylalkanoic Acids from 'Masked' α-Halogenoalkyl Aryl Ketones and Silver Salts: Synthetic, Kinetic, and Mechanistic Aspects
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A method for the synthesis of alkyl esters of α-arylalkanoic acids is given based on silver-ion-assisted (AgBF4, AgOSO2CF3, AgSbF6, AgNO3) solvolysis of alkyl acetals of primary and secondary α-halogenoalkyl aryl ketones (Hal = I, Br, Cl) in an alcoholic medium (methanol, ethanol).The reaction is quite selective and alkyl esters are the only reaction products; ethers, which are possible substitution products, are not found.The importance of masking the carbonyl as the acetal is emphasised.The reaction is found to be first-order in AgBF4 and in the primary α-halogeno acetal.A three-point Hammett correlation (ρ = -3.29) between ?+ and the rate constants suggests a large cationic contribution as well as strong aryl participation in the transition state.The role payed by the oxygen of the acetal group in the specificity of the reaction is discussed in comparison with the reactivity of analogous compounds with saturated skeletons and of α-halogenoalkyl aryl ketones.
- Giordano, Claudio,Castaldi, Graziano,Casagrande, Francesco,Belli, Aldo
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p. 2575 - 2582
(2007/10/02)
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