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In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 497-25-6, name is Oxazolidin-2-one, introducing its new discovery. category: oxazolidine

What a catch! Basic ionic liquids (ILs) based on a phosphonium hydroxide derivative can be tuned for CO2 capture by varying the weak proton donors, which have different pKa values. The stability, absorption capacity, and absorption enthalpy of the ILs could be easily tuned: the best IL for CO2 capture has good stability (>300 C), energy saving (ca. 56kJ mol-1), and equimolar absorption capability. Copyright

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H1107NO – PubChem

 

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ConspectusThe construction of libraries of acyclic polyketides remains a challenging topic, mostly due to the difficulties associated with finding the right balance between diversity and brevity for the synthetic routes leading to polyketides. Recently, relatively short methods have been developed and applied to the synthesis of natural products. However, these short routes often suffer from limited diversity with respect to the arrangement of functional groups and stereochemistry, as these usually require reactions that direct multiple functional groups simultaneously in one step. Therefore, methods that combine a small number of reaction steps with structural diversity remain an attractive research target for the construction of acyclic polyketide libraries.In 2004, we reported a remote asymmetric induction reaction using chiral vinylketene silyl N,O-acetal 1, which is commensurate to an anti-selective vinylogous Mukaiyama aldol reaction. Ever since, this reaction has been applied to the synthesis of numerous natural products, as this synthetic route is short and efficient on account of the simultaneous introduction of both asymmetric centers and the multiply functionalized carbon chain. Recently, we have developed a variety of this remote asymmetric induction reaction based on the E,E-vinylketene N,O-acetal 1, which includes syn-selective vinylogous Mukaiyama aldol reactions, as well as alkylation, acylation, and bromination reaction. These reactions provide polypropionates in a highly stereoselective manner. The proposed transition states of these reactions are discussed in this Account. Additionally, we have developed a new short synthesis of polypropionates by combining reactions for the remote asymmetric induction and the functionalization of double bonds (wide-range stereocontrol, WRS). The remote asymmetric induction reaction simultaneously constructs the stereogenic centers at the central part of the products and introduces the alpha,beta-unsaturated imide, while the new strategy is based on the initial construction of the central part of the molecule and a subsequent functionalization of the surroundings (WRS). This strategy successfully furnished stereoisomers in a few steps, and the stereodivergent synthesis of 2,4,6-trimethyloctanoic acid derivatives was accomplished. This strategy should also be feasible to construct an acyclic polyketide library. Moreover, we applied this method to the concise synthesis of natural products. In this Account, the development of remote asymmetric induction reactions and the new WRS strategy are described. Applications of the WRS strategy as well as reactions for the stereodivergent synthesis of polypropionates and natural products are also described. The aforementioned acyclic polyketide library should be constructed in the future with the help of the WRS strategy and become a powerful tool in drug discovery.

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Oxazolidine – Wikipedia,
Oxazolidine | C3H617NO – PubChem

 

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In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Formula: C3H5NO2, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 497-25-6, name is Oxazolidin-2-one. In an article,Which mentioned a new discovery about 497-25-6

Intramolecular nucleophilic acyl substitution reactions involving a broad range of halo substituted carboxylic acid derivatives have been accomplished in excellent yield employing samarium(II) iodide as the reductive coupling agent.Although particular substrates cyclized most effectively in THF in the presence of tripiperidinophosphine oxide, carboxylic acid esters, the focus of this report, cyclize equally well without such an additive in the presence of a catalytic quantity of iron(III) complexes.Thus a comprehensive series of halo substituted esters were cyclized in excellent yield to the corresponding 4-, 5-, and 6 -membered carbocycles.The reaction is extremely mild and selective as demonstrated by experiments wherein alkyl chlorides, acetals, and olefins remain completely intact under the reaction conditions.In addition to introducing a convenient procedure for preparing stereodefined spirocyclic systems, a new ring expansion sequence has been developed that appears extremely general for the preparation of various ring systems.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H828NO – PubChem

 

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A protocol for the palladium(0)-catalyzed amidation of heteroaromatic tosylates was successfully developed. The methodology proved to be effective for a variety of heteroaryl tosylates including the pyridine, pyrimidine, quinoline and quinoxaline ring systems. Successful carbon-nitrogen bond formation with these heteroaryl tosylates could be performed with a wide range of primary amides, oxazolidinones, lactams, anilines and indoles, including one cyclic urea. Moreover, this C-N bond forming reaction provided products with high structural diversity. The coupling reaction was also amenable to scale up applications.

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Oxazolidine – Wikipedia,
Oxazolidine | C3H791NO – PubChem

 

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Thermal degradation of monethanolamine (MEA) is quantified as a function of initial amine concentration, CO2 loading, and temperature over a range of expected stripper conditions in an amine absorber/stripper unit. The sum of the degradation products N,N’-di(2-hydroxyethyl)urea, 1-(2-hydroxyethyl)-2-imidazolidone, and N-(2-hydroxyethyl)ethylenediamine make up the majority of total MEA loss. The temperature dependent rate constant has an activation energy similar to diethanolamine (DEA) of 29 kcal/mole which corresponds to a quadrupling of the degradation rate when the stripper temperature is increased 17 {ring operator}C. At 135 {ring operator}C the degradation rate varies from 2.5 to 6% per week. Using speciation data from an Aspen model of a stripper unit, losses in the packing are significant, but the majority of MEA loss occurs in the reboiler and reboiler sump. Thermal degradation is minor when the reboiler temperature is held below 110 {ring operator}C.

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Oxazolidine – Wikipedia,
Oxazolidine | C3H476NO – PubChem

 

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As part of our efforts to develop agents for cognitive enhancement, we have been focused on the 5-HT6 receptor in order to identify potent and selective ligands for this purpose. Herein we report the identification of a novel series of 3-sulfonylindazole derivatives with acyclic amino side chains as potent and selective 5-HT6 antagonists. The synthesis and detailed SAR of this class of compounds are reported.

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Oxazolidine – Wikipedia,
Oxazolidine | C3H759NO – PubChem

 

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In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 497-25-6, name is Oxazolidin-2-one, introducing its new discovery. SDS of cas: 497-25-6

Three become one! In one copper-mediated step, three simple components, including a propargylcarboxamide, a protected amine, and a source of chloride, assemble to give highly functionalized oxazines, which are interesting building blocks for the synthesis of other aminooxazine derivatives (see scheme; R 1=range of aryl or alkyl groups, R2=alkyl, EWG=electron-withdrawing group).

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Oxazolidine – Wikipedia,
Oxazolidine | C3H596NO – PubChem

 

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Although aerobic oxidative acylation of amides with alcohols would be a good complement to classical synthetic methods for imides (e.g., acylation of amides with activated forms of carboxylic acids), to date, there have been no reports on oxidative acylation to produce imides. In this study, we successfully developed, for the first time, an efficient method for the synthesis of imides through aerobic oxidative acylation of amides with alcohols by employing a CuCl/TMEDA/nor-AZADO catalyst system (TMEDA = teramethylethylendiamine; nor-AZADO = 9-azanoradamantane N-oxyl). The proposed acylation proceeds through the following sequential reactions: aerobic oxidation of alcohols to aldehydes, nucleophilic addition of amides to the aldehydes to form hemiamidal intermediates, and aerobic oxidation of the hemiamidal intermediates to give the corresponding imides. This catalytic system utilizes O2 as the terminal oxidant and produces water as the sole by-product. An important point for realizing this efficient acylation system is the utilization of a TMEDA ligand, which, to the best of our knowledge, has not been employed in previously reported Cu/ligand/N-oxyl systems. Based on experimental evidence, we consider that plausible roles of TMEDA involve the promotion of both hemiamidal oxidation and regeneration of an active CuII-OH species from a CuI species. Here promotion of hemiamidal oxidation is particularly important. Employing the proposed system, various types of structurally diverse imides could be synthesized from various combinations of alcohols and amides, and gram-scale acylation was also successful. In addition, the proposed system was further applicable to the synthesis of alpha-ketocarbonyl compounds (i.e., alpha-ketoimides, alpha-ketoamides, and alpha-ketoesters) from 1,2-diols and nucleophiles (i.e., amides, amines, and alcohols).

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Oxazolidine – Wikipedia,
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Electrophilic radicals undergo crotylation with crotylstannane with moderate to good efficiency. The reaction provides the syn isomer as the major product. The present methodology is complementary to Claisen protocols for the synthesis of gamma,delta-unsaturated carboxylic acid derivatives. Details of the new radical methodology are presented. [reaction: see text]

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H1000NO – PubChem

 

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The synthesis and reactivity of a series of new allenamides are described. These electron deficient variants of allenamines are more stable than allenamines but possess comparable reactivity. Particularly, oxazolidinone and imidazolidinone substituted allenamides undergo efficient inverse demand [4+2] cycloaddition reactions with heterodienes, leading to unique pyranyl heterocycles. The reactivity differences between various allenamides containing different substitution patterns around the nitrogen atom are illustrated.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H1125NO – PubChem