cas 34523-34-7, 4-[1-(hydroxyamino)ethylidene]cyclohexa-2,5-dien-1-one

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An oxime-carbapalladacycle complex covalently anchored to silica as an active and reusable heterogeneous catalyst for Suzuki cross-coupling in water
A preformed oxime-carbapalladacycle complex covalently anchored onto mercaptopropyl modified silica is highly active (> 99%) for the Suzuki reaction of p-chloroacetophenone and phenylboronic acid in water; no leaching occurs and the same catalyst sample was reused eight times without decreased activity.
Baleizao, Carlos,Corma, Avelino,Garcia, Hermenegildo,Leyva, Antonio
p. 606 - 607
(2003)
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Beckmann rearrangement of ketoximes promoted by cyanuric chloride and dimethyl sulfoxide under a mild condition
Synthesis of amides via Beckmann rearrangement of ketoximes promoted by cyanuric chloride (TCT)/DMSO under mild conditions has been reported. Conditions of the Beckmann rearrangement, e.g., solvents, the ratios of TCT/DMSO, and the temperature, were investigated using diphenylmethanone oxime as a substrate. The optimized conditions were adopted to afford fourteen amides with yields ranging from 20% to 99%. A plausible mechanism involving an active dimethyl alkoxysulfonium intermediate was proposed according to the mass spectrometry analysis. To our best knowledge, this is the first case of study on Beckmann rearrangement of ketoximes promoted by TCT/DMSO under a mild condition to afford amides efficiently.
Ma, Ruonan,Chen, Xueyuan,Xiao, Zhiyin,Natarajan, Mookan,Lu, Chunxin,Jiang, Xiujuan,Zhong, Wei,Liu, Xiaoming
supporting information

(2021/01/06)

Trifluoroacetic Acid Hydroxylamine System as Organocatalyst Reagent in a One-Pot Salt Free Process for the Synthesis of Caprolactam and Amides of Industrial Interest
In this work we studied the reactivity of the Trifluoroacetic acid hydroxylamine system in the one step salt free synthesis of amides from ketones. A particular regards was paid to the caprolactam synthesis because of its industrial relevance. Synthesis, reactivity and characterization of the hydroxylamine trifluoroacetate is given. Fast oximation reaction of several ketones was gained at room temperature (1?h of reaction quantitative conversion for several ketones). In the same reactor, by raising the temperature at 383?K, the Beckmann rearrangement of the so obtained oximes is easily accomplished in the presence of three equivalent of TFA. The possibility of obtaining the trifluoroacetate of the hydroxylamine with a modified nitric acid hydrogenation reactions was verified, too. Reuse of solvent and trifluoroacetic acid is easily achieved by distillation. Graphical abstract: Salt free one-pot caprolactam and amides process catalyzed by CF3COOH, in the presence of NH2OH TFA as the oximation agent.[Figure not available: see fulltext.].
Manente,Pietrobon,Ronchin,Vavasori
p. 3543 - 3549
(2021/03/30)

Chlorotropylium Promoted Conversions of Oximes to Amides and Nitriles
Chlorotropylium chloride as a catalyst for the transformations of oximes, ketones, and aldehydes to their corresponding amides and nitriles in excellent yields (up to 99 %) and in short reaction times (mostly 10–15 min). Oximes were electrophilically attacked on the hydroxyl oxygen by chlorotropylium. The produced tropylium oxime ethers were the key intermediates, of which the ketoxime ether led to amide through Beckmann rearrangement, and the aldoxime ether led to nitrile by nitrogen base DBU assisted formal dehydration. This chlorotropylium activation protocol offered general, mild, and efficient avenues bifurcately from oximes to both amides and nitriles by one organocatalyst.
Xu, Jiaxi,Gao, Yu,Li, Zhenjiang,Liu, Jingjing,Guo, Tianfo,Zhang, Lei,Wang, Haixin,Zhang, Zhihao,Guo, Kai
p. 311 - 315
(2020/01/25)

SO2F2-Activated Efficient Beckmann Rearrangement of Ketoximes for Accessing Amides and Lactams
A novel, mild and practical protocol for the efficient activation of the Beckmann rearrangement utilizing the readily available and economical sulfuryl fluoride (SO2F2 gas) has been developed. The substrate scope of the operationally simple methodology has been demonstrated by 37 examples with good to nearly quantitative isolated yields (over 90 % yield in most cases) in a short time, including B(OH)2, COOH, NH2, and OH substituted substrates. A tentative mechanism was proposed involving formation and elimination of key intermediate, sulfonyl ester.
Zhang, Guofu,Zhao, Yiyong,Xuan, Lidi,Ding, Chengrong
supporting information
p. 4911 - 4915
(2019/07/31)

Silicon-grafted Ag/AgX/rGO nanomaterials (X = Cl or Br) as dip-photocatalysts for highly efficient p-nitrophenol reduction and paracetamol production
In this work, plasmonic Ag/AgX/rGO (X?=?Cl or Br) nano-photocatalysts were grafted with silicon by adding trimethylsilyl chloride as silicon precursor. The synthesized Ag/AgX/rGO-Si hybrids showed a large improvement of photocatalytic activity towards the synthesis of p-aminophenol (PAP) as well as paracetamol (acetaminophen; APAP) through the photoreduction of p-nitrophenol (PNP). The prepared catalysts Ag/AgX/rGO were characterized using SEM, XRD, FTIR and the reduction reaction of p-nitrophenol was monitored by UV–Vis measurements, GC/MS and 1HNMR data. From the results, it was demonstrated that the rate order of reduction process of the PNP to PAP and to APAP under visible light irradiation of the samples was as follows; Ag/AgBr/rGO-Si?>?Ag/AgCl/rGO-Si?>?Ag/AgBr/rGO?>?Ag/AgCl/rGO. The reaction mechanism had been postulated that was supported with the spectroscopic data. In addition, the catalysts were recovered from the reaction medium and re-used in three cycles that indicated the reusability and stability of the catalysts. This study was featured by the following; i) fast reaction, ii) the reduction of p-nitrophenol to paracetamol was performed in a facile one-pot reaction compared to previous approaches that tends to reduce the production cost, and iii) investigations on the catalytic properties of Ag/AgX/rGO in organic transformations open the door to find a benefice of these catalysts in other organic reactions and in the development in the synthesis of pharmaceutical products.
Attia, Yasser A.,Mohamed, Yasser M.A.
(2019/01/04)

Oxime-derived palladacycle Immobilized in an Ionic Liquid Brush as an Efficient and Reusable Catalyst for Mozoroki-Heck Reaction in Neat Water
An efficient and reusable heterogeneous catalyst with oxime-derived palladacycle immobilized in an ionic liquid brush has been synthesized and an environmentally-friendly procedure have been developed for coupling aryl iodides and bromides with acrylic acid. These reactions were conducted in neat water under aerobic conditions with water-insoluble or even solid aryl halides and they proceeded smoothly and cleanly without any organic co-solvent or other additives. The ionic liquid brush could be easily recovered and reused at least five times without significant loss of activity. The protocol has the advantages of excellent yields, environmental friendliness, and catalyst recyclability.
Wang, Rong,Li, Shan,Li, Jing,Wei, Junfa
(2019/09/17)

Scope and mechanism of a true organocatalytic beckmann rearrangement with a boronic acid/perfluoropinacol system under ambient conditions
Catalytic activation of hydroxyl functionalities is of great interest for the production of pharmaceuticals and commodity chemicals. Here, 2-alkoxycarbonyl- and 2-phenoxycarbonyl-phenylboronic acid were identified as efficient catalysts for the direct and chemoselective activation of oxime N-OH bonds in the Beckmann rearrangement. This classical organic reaction provides a unique approach to prepare functionalized amide products that may be difficult to access using traditional amide coupling between carboxylic acids and amines. Using only 5 mol % of boronic acid catalyst and perfluoropinacol as an additive in a polar solvent mixture, the operationally simple protocol features mild conditions, a broad substrate scope, and a high functional group tolerance. A wide variety of diaryl, aryl-alkyl, heteroaryl-alkyl, and dialkyl oximes react under ambient conditions to afford high yields of amide products. Free alcohols, amides, carboxyesters, and many other functionalities are compatible with the reaction conditions. Investigations of the catalytic cycle revealed a novel boron-induced oxime transesterification providing an acyl oxime intermediate involved in a fully catalytic nonself-propagating Beckmann rearrangement mechanism. The acyl oxime intermediate was prepared independently and was subjected to the reaction conditions. It was found to be self-sufficient; it reacts rapidly, unimolecularly without the need for free oxime. A series of control experiments and 18O labeling studies support a true catalytic pathway involving an ionic transition structure with an active and essential role for the boronyl moiety in both steps of transesterification and rearrangement. According to 11B NMR spectroscopic studies, the additive perfluoropinacol provides a transient, electrophilic boronic ester that is thought to serve as an internal Lewis acid to activate the ortho-carboxyester and accelerate the initial, rate-limiting step of transesterification between the precatalyst and the oxime substrate.
Mo, Xiaobin,Morgan, Timothy D. R.,Ang, Hwee Ting,Hall, Dennis G.
supporting information
p. 5264 - 5271
(2018/04/24)

A su ammonia amide carbamate derivative and application thereof
The invention belongs to the field of plant bactericide, and relates to a threonyl amine carbamate derivative shown as the general formula (I) and salt capable of being accepted pharmaceutically. Substituent groups R1, R2 and R3 have the definitions given by a specification. The invention further relates to a preparation method of the compound of the general formula (I), a midbody specially developed for preparing the threonyl amine carbamate derivative and an application of the threonyl amine carbamate derivative in plant disease prevention and control. The formula is shown in the specification.
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Paragraph 0055; 0075; 0088

(2017/09/02)

Ir(III)-Catalyzed Synthesis of Isoquinoline N-Oxides from Aryloxime and α-Diazocarbonyl Compounds
An efficient Ir(III)-catalyzed C-H activation and annulations of aryloxime with α-diazocarbonyl compounds has been developed for the synthesis of substituted isoquinoline N-oxides. The reaction proceeds under mild atmospheric conditions, without any external oxidants and releases N2 and H2O as the byproducts. In addition, synthetic applications of the N-oxide products have been established by performing further functionalization. An interesting dimeric iridacyclic complex allied through a bis-silver carboxylate bridge has been isolated that efficiently catalyzed the reaction.
Phatake, Ravindra S.,Patel, Pitambar,Ramana, Chepuri V.
supporting information
p. 292 - 295
(2016/02/03)

Photo-polymerizable compound, an amine light generating agent, and photosensitive film photosensitive resin composition
PROBLEM TO BE SOLVED: To provide a photopolymerizable compound and an optical amine generator, as well as a photosensitive resin composition and a photosensitive film capable of achieving a curing system that simultaneously enables stability in one liquid or in a film state and curability sufficient to obtain insulation reliability. SOLUTION: The photopolymerizable compound is a compound represented by formula (1) or (2). In formula (1), R1and R4are each a photopolymerizable group having an ethylenically unsaturated bond; R2is a hydrogen atom or a 1-20C organic group; R3is a 1-20C organic group; and n is an integer of 1-5. In formula (2), R1and R4are each a photopolymerizable group having an ethylenically unsaturated bond; R5is a 1-20C organic group; R6is a 1-20C organic group; and m is 1 or 2. COPYRIGHT: (C)2012,JPOandINPIT
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Paragraph 0110

(2017/01/02)

ZnO Nanotube as reusable catalyst in the efficient and selective oximation reaction of carbonyl groups under solvent free conditions
A convenient and efficient procedure for the selective protection of carbonyl groups in the presence of ZnO nanotube, as reusable eco-friendly catalyst under solvent free conditions is described. The salient features of this methodology are cheaper process, easy availability of the catalyst, versatility, and the catalyst can be recovered after completion of the reaction and can be recycled without affecting the catalytic property.
Kiasat, Ali Reza,Javaherian, Mohammad,Daei, Mina,Farbod, Mansoor
p. 875 - 880
(2015/11/24)

Cobalt(III)-Catalyzed Dehydrative [4+2] Annulation of Oxime with Alkyne by C-H and N-OH Activation
Efficient, scalable cobalt-catalyzed redox-neutral [4+2] annulation of readily available oximes and alkyne is reported. The developed synthetic methodology is widely applicable and tolerates various functional groups including heterocycles. A stable CpCoIII neutral complex is employed as the catalyst for this redox-neutral [4+2] annulation reaction, which progresses smoothly by way of a reversible cyclometallation without any external oxidizing agent, and produces only water as the side product.
Sen, Malay,Kalsi, Deepti,Sundararaju, Basker
supporting information
p. 15529 - 15533
(2015/11/03)

APPLICATIONS OF N6-SUBSTITUTED ADENOSINE DERIVATIVE AND N6-SUBSTITUTED ADENINE DERIVATIVE TO CALMING, HYPNOSES, CONVULSION RESISTANCE, EPILEPTIC RESISTANCE, PARKINSON DISEASE RESISTANCE, AND DEMENTIA PREVENTION AND TREATMENT
PROBLEM TO BE SOLVED: To prepare analgesics, hypnotic agents, anticonvulsant agents, antiepileptics, antiparkinson drugs, dementia prophylactics, and health care food. SOLUTION: The present invention relates to an N6-substituted adenosine derivative and an N6-substituted adenine derivative selected from the group consisting of specific compounds. The present invention also relates to a pharmaceutical composition at least comprising a therapeutically effective amount of the compounds and a pharmaceutically acceptable carrier. The invention further relates to the compounds used in preparation of analgesics, hypnotic agents, anticonvulsant agents, antiepileptics, antiparkinson drugs, dementia prophylactics, and health care food. COPYRIGHT: (C)2016,JPO&INPIT
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Paragraph 0139

(2018/10/27)

Self-catalyzed direct amidation of ketones: A sustainable procedure for acetaminophen synthesis
High yielding amination of ketones and benzaldehyde in acid-less conditions has been conducted on several ketones to achieve amides and nitriles. The reactivity of the selected substrates showed to depend on both oximation and Beckmann rearrangement reaction rates. Oximation allows the in-situ production of hydrochloric acid that enables Beckmann rearrangement of the oxime to form the corresponding amide or nitrile. It is noteworthy that, using this one-pot synthetic approach, N-acetyl-4-aminophenol (acetaminophen drug), can be easily synthesized starting from 4-hydroxy-acetophenone in high yield. Acetanilide and ε-caprolactam can be also efficiently synthesized employing this synthetic procedure.
Rancan, Elia,Aricò, Fabio,Quartarone, Giuseppe,Ronchin, Lucio,Tundo, Pietro,Vavasori, Andrea
p. 11 - 16
(2015/03/18)

Self-catalyzed direct amidation of ketones: A sustainable procedure for acetaminophen synthesis
High yielding amination of ketones and benzaldehyde in acid-less conditions has been conducted on several ketones to achieve amides and nitriles. The reactivity of the selected substrates showed to depend on both oximation and Beckmann rearrangement reaction rates. Oximation allows the in-situ production of hydrochloric acid that enables Beckmann rearrangement of the oxime to form the corresponding amide or nitrile. It is noteworthy that, using this one-pot synthetic approach, N-acetyl-4-aminophenol (acetaminophen drug), can be easily synthesized starting from 4-hydroxy-acetophenone in high yield. Acetanilide and ε-caprolactam can be also efficiently synthesized employing this synthetic procedure.
Rancan, Elia,Aricò, Fabio,Quartarone, Giuseppe,Ronchin, Lucio,Tundo, Pietro,Vavasori, Andrea
p. 11 - 16
(2014/06/23)

Beckmann rearrangement of acetophenone oximes to the corresponding amides organo-catalyzed by trifluoroacetic acid for sustainable NSAIDs synthesis
The Beckmann rearrangement of acetophenone oximes to the corresponding amides (4-hydroxyacetophenone oxime to N-acetyl-4-hydroxyacetanilide and acetophenone oxime to N-phenylacetamide) is investigated by using trifluoroacetic acid (TFA) as catalyst. The reaction occurs either in the presence or in the absence of a suitable solvent. High selectivity and practically quantitative yield to amide is achieved in both cases at TFA/substrate > 3. Both TFA and the solvent (whenever present) could be easily reused by distillation since no protonation of amides occurs. The reaction proceeds via a multistep reaction path and the role of TFA is related not only to its acidity but also mainly to its ability on forming reactive trifluoroacetylated intermediates. In particular, the highly reactive trifluoroacetylated amide is actually the effective catalyst. Finally, a likely reaction path is proposed.
Quartarone, Giuseppe,Rancan, Elia,Ronchin, Lucio,Vavasori, Andrea
p. 167 - 177
(2014/02/14)

N6-SUBSTITUTED ADENOSINE DERIVATIVES AND N6-SUBSTITUTED ADENINE DERIVATIVES AND USES THEREOF
The present invention provides N6-substituted adenosine derivatives and N6-substituted adenine derivatives, manufacturing methods thereof, a pharmaceutical composition comprising the said compounds above, and uses of these compounds in manufacturing medicaments and health-care products for treating insomnia, convulsion, epilepsy, and Parkinson's diseases, and preventing and treating dementia.
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Paragraph 0234

(2013/03/26)

Direct arylation under catalysis of an oxime-derived palladacycle: Search for a phosphane-free method
A phosphane-free method for the direct arylation of benzothiazole by employing oxime-derived palladacycle 1 as a catalyst was developed. The new catalyst system can be used for 2-arylations by using aryl bromides and iodides. In addition, this method is especially suitable for the intramolecular direct coupling of bromo-and iodoamides, as well aschloroamides, to achieve a rapid synthesis of benzo[c]phenanthridine alkaloids. Direct arylation reactions under catalysis of an oxime-derived palladacycle were investigated. This phosphane-free method is applicable for the 2-arylation of benzothiazole and is especially suitable for the intramolecular direct coupling of bromo-and iodoamides, as well as chloroamides, to achieve rapid synthesis of benzo[c]phenanthridine alkaloids. Copyright
Zhang, Guofu,Zhao, Xiaobao,Yan, Yunbing,Ding, Chengrong
supporting information; experimental part
p. 669 - 672
(2012/03/27)

Synthesis of dibromo ketones by the reaction of the environmentally benign H2O2-HBr system with oximes
It was found that oximes undergo deoximation in the presence of the H2O2aq-HBraq system to form ketones and bromo ketones. This reaction provided the basis for the synthesis of dibromo ketones in yields varying from 40% to 94%. This method is environmentally friendly, sustainable, and easy to perform. The results of this investigation extend the potential of the use of oximes for the protection of carbonyl group, thus offering the ability to perform not only conventional deoximation but also the subsequent bromination of ketones. The reaction is easily scaled up and dibromo ketones can be prepared in gram amounts. Versita Sp. z o.o.
Terentev, Alexander O.,Krylov, Igor B.,Vil, Vera A.,Pastukhova, Zhanna Yu.,Fastov, Sergey A.,Nikishin, Gennady I.
experimental part
p. 360 - 367
(2012/08/08)

N6-SUBSTITUTED ADENOSINE DERIVATIVES, N6-SUBSTITUTED ADENINE DERIVATIVES AND USES THEREOF
The present invention provides N6-substituted adenosine derivatives and N6-substituted adenine derivatives, manufacturing methods thereof, a pharmaceutical composition comprising the said compounds above, and uses of of these compounds in manufacturing medicaments and health-care products for treating insomnia, convulsion, epilepsy, and Parkinson's diseases, and preventing and treating dementia.
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Page/Page column 63-64

(2012/11/06)

Acid hydrolysis of amides obtained by Beckmann rearrangement of methyl ketones oximes of unsaturated γ-lactone, aromatic, and alicyclic series
Beckmann rearrangement was performed of oximes of substituted 3-acetyl-4-methyl-5,5-dimethyl(pentamethylene)-2-oxo-2,5-dihydrofuranes in the presence of boron trifluoride etherate. Aiming at establishing the spatial arrangement of the oximes the hydrolysis was carried out of acid amides obtained by Beckmann rearrangement of oximes of methyl ketones belonging to unsaturated γ-lactone series and also to aromatic and alicyclic series. The hydrolysis with 20% sulfuric acid led to the formation of the corresponding acid and amine, and the hydrolysis with acetic and hydrochloric acids resulted in retrobeckmann rearrangement giving the initial oximes.
Tokmadzhyan
experimental part
p. 1746 - 1749
(2012/03/10)

Sodium nitrite catalyzed aerobic oxidative deoximation under mild conditions
A mild, simple process for the effective deoximation of a wide range of ketoximes and aldoximes has been developed, which utilizes available NaNO 2 as the catalyst and molecular oxygen as the green oxidant. Notably Amberlyst-15, which acts as the initiator of NaNO2, can be reused without regeneration. This environmentally benign protocol could provide a valuable synthetic method for practical applications.
Zhang, Guofu,Wen, Xin,Wang, Yong,Mo, Weimin,Ding, Chengrong
supporting information; experimental part
p. 4665 - 4668
(2011/07/29)

Synthesis of new pyrimidine nucleoside derivatives with nitric oxide donors for antiviral activity
New pyrimidine nucleoside derivatives with nitric oxide (NO) donor were systematically synthesized. The antivirus activities of these nucleoside analogues against vesicular stomatitis virus (VSV) in Wish cell were evaluated. It was demonstrated that most of compounds had stronger antiviral acitivity than acyclovir, while their toxicities were similar or lower to acyclovir.
Shi, Jing Bo,Xu, Song,Wang, Ya Ping,Li, Jing Jing,Yao, Qi Zheng
experimental part
p. 899 - 902
(2012/01/11)

Ionophilic phosphonium-appended carbopalladacycle catalyst for Suzuki-Miyaura and Heck cross-coupling catalysis
An ionic liquid, covalently tethered to an efficient transition-metal catalyst in the presence of an ionic liquid reaction medium, can utilize ionophilic interactions to improve catalyst activity, recyclability, and product isolation while decreasing catalyst leaching. Given the greater stability of phosphonium salts in comparison to imidazolium ionic liquids under basic conditions, phosphonium-tagged oxime carbopalladacycle salts were prepared and employed in both Heck and Suzuki-Miyaura reactions. The desired product was obtained in good yields for up to four catalyst cycles in the case of the Suzuki-Miyaura reaction. While taking advantage of the non-volatile nature of ionic liquids, the product was isolated through simple sublimation from the reaction mixture, eliminating issues associated with catalyst leaching, and the remaining ionic liquid solvent-catalyst mixture was ready for further catalysis.
Jocelyn,Paul, Tindale,Ragogna
scheme or table
p. 27 - 34
(2010/03/04)

ARYLSULFONAMIDE COMPOUNDS, COMPOSITIONS AND METHODS OF USE
Disclosed are compounds which inhibit the activity of anti-apoptotic protein family members, compositions containing the compounds and uses of the compounds for preparing medicaments for treating diseases during which occurs expression one or more than one of an anti apoptotic protein family member.
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Page/Page column 224

(2009/12/27)

Comparison between polyethylenglycol and imidazolium ionic liquids as solvents for developing a homogeneous and reusable palladium catalytic system for the Suzuki and Sonogashira coupling
The carbapalladacycle complex of 4-hydroxyacetophenone oxime is a highly active palladium catalyst to effect the Suzuki coupling of aryl chlorides and other C-C forming reactions in water. In an attempt to develop a reusable, homogeneous system based on this complex, its stability against prolonged heating in different ionic liquids and polyethylenglycol (PEG) has been studied. It was found that the palladium complex decomposes in water, 1-butyl-1-methylimidazolium hexafluorophosphate and 1-butyl-1-methylimidazolium chloride to form palladium nanoparticles in the first two cases and PdCl 42- in the third case. In contrast, this cyclic palladium complex was stable upon extended heating in 1-butyl-2,3-dimethylimidazolium hexafluorophosphate and in PEG. The activity of this complex for the Suzuki and Sonogashira correlates with the stability of the complex, the activity in PEG being higher than any of the ionic liquids tested. Although the carbapalladacycle complex also decomposes in PEG upon reaction, the resulting Pd nanoparticles (2-5 nm size) are stabilized by PEG acting as ligand. In this way, a reusable, homogeneous system in PEG has been developed that is able to effect the Suzuki and Sonogashira couplings without the need of copper and phosphorous ligands, working at the open air.
Corma, Avelino,García, Hermenegildo,Leyva, Antonio
p. 9848 - 9854
(2007/10/03)

Oxime Carbapalladacycle Covalently Anchored to High Surface Area Inorganic Supports or Polymers as Heterogeneous Green Catalysts for the Suzuki Reaction in Water
An oxime carbapalladacycle known as an extremely active homogeneous catalyst for the Suzuki coupling in water has been conveniently modified and anchored on high surface area SiO2, MCM-41, and polystyrene-divinylbenzene and ethylenglycol dimethylacrylate polymers. The resulting solids were characterized by analytical and spectroscopic (UV-vis and IR) techniques and tested as catalysts for the reaction of 4-chloroacetophenone with phenylboronic acid in water, dioxane, and a mixture of both. Differences in activity depending on the support were remarkable, the palladium complex being more active for the reactions in water when supported on SiO2 or MCM-41. The catalysts were truly heterogeneous (no leached palladium) and when anchored on SiO2 were reused seven times without loosing activity. Palladium complex anchored in SiO2 was also tested as Suzuki catalyst for a wide range of bromo-, chloro-, and even fluoroaromatics.
Baleizao, Carlos,Corma, Avelino,Garcia, Hermenegildo,Leyva, Antonio
p. 439 - 446
(2007/10/03)

Method of depigmenting and/or bleaching skin and/or body hair or head hair
The use, in a topical cosmetic composition, or for the manufacture of a topical dermatological composition, intended for depigmenting and/or bleaching human skin, body hair or head hair, of at least one compound comprising a phenyloxime fragment.
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(2008/06/13)

A New, Regioselective, Tandem Amidation Reaction of Electron-Rich Arenes
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Cablewski, Teresa,Gurr, Paul A.,Raner, Kevin D.,Strauss, Christopher R.
p. 5814 - 5817
(2007/10/02)

Thiocarbamates and their derivatives
A process is provided for preparing N-acyl-aminothiophenols, e.g., N-acetyl-para-aminothiophenol, or aminothiophenols, e.g., para-aminothiophenol, by reacting a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone (4-HAP), with hydroxylamine or a hydroxylamine salt, to form the oxime of the ketone, subjecting the oxime to a Beckmann rearrangement in the presence of a catalyst to form the N-acyl-hydroxy aromatic amine, e.g., N-acetyl-para-aminophenol (APAP), reacting the N-acyl-hydroxy aromatic amine with an N,N-di (organo) thiocarbamoyl halide, e.g., N,N-dimethylthiocarbamoyl chloride, to form an O-(N-acyl-aminoaryl)-N,N-di (organo) thiocarbamate, e.g., O-(N-acetyl-para-aminophenyl)-N,N-dimethylthiocarbamate, pyrolytically rearranging the O-(N-acyl-aminoaryl)-N,N-di (organo) thiocarbamate to form an S-(N-acyl-aminoaryl)-N,N-di (organo) thiocarbamate, e.g., S-(N-acetyl-para-aminophenyl)-N,N-dimethylthiocarbamate, and hydrolyzing the latter compound to obtain the N-acyl aminothiophenol or aminothiophenol. The N-acyl aminothiophenol may be reacted with an acylating agent to form the N,S-diacyl-aminothiophenol, e.g., N,S-diacetyl-p-aminothiophenol, or may be further hydrolyzed to the aminothiophenol, e.g., p-aminothiophenol.
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(2008/06/13)

Amino acid derivatives having anti-tumor activity and compositions containing them
Amino acid amides of formula (I): STR1 wherein R1 -R5 and Y represent a variety of organic groups and atoms (including where R2, Y and the adjacent nitrogen atom together represent a thiazolidine or pyrrolidine group) and X represents carbonyl or sulfonyl are mostly new compounds and have valuable anti-tumor and immuno-regulatory activities. They may be formulated in compositions for pharmaceutical use.
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(2008/06/13)

Process for producing n-acyl-acyloxy aromatic amines
A process is provided for producing N-acyl-acyloxy aromatic amine, such as 4-acetoxyacetanilide by reacting a hydroxy-aromatic ketoxime with a carboxylic acid anhydride, e.g. acetic anhydride, in the presence of phosphoric or oxalic acid as a Beckmann rearrangement catalyst. Preferably the ketoxime is prepared by reacting a hydroxy aromatic ketone such as 4-hydroxyacetophone with a hydroxyl amine salt, and the ketone is obtained by the Fries rearrangement of a phenolic ester, e.g. phenyl acetate or the Friedel-Crafts acylation of a phenolic compound, e.g. phenol, with an acylating agent, e.g. acetic acid.
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(2008/06/13)

Process for producing N-acyl-hydroxy aromatic amines
N-acyl-hydroxy aromatic amines, e.g. N-acetyl-para-aminophenol (APAP), are prepared by reacting a hydroxy aromatic ketone, e.g. 4-hydroxyacetophenone, with a hydroxylamine salt and a base to obtain the ketoxime of the ketone, e.g. 4-hydroxyacetophenone oxime, and then subjecting the ketoxime to a Beckmann rearrangement in the presence of a catalyst to form the N-acyl-hydroxy aromatic amine.
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(2008/06/13)