Tag: M.W:0-100

New research progress on 19132-06-0 in 2021. Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. Product Details of 19132-06-0, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 19132-06-0

alpha-Silylated ketones 5 or 10 of high enantiomeric purity (ee>=90percent) are easily available by silylation or silylation/alkylation of ketones 1 or 6, resp., according to the SAMP/RAMP hydrazone method.Reduction of 5 or 10 with L-selectride<*>, followed by oxidative cleavage of the C-Si bond, leads to vic-diols 11-13 with high diastereoselectivity (de>=90percent) and without racemization.The stereoselectivity of the reduction depends on the structure of the alpha-silyl ketones 5 or 10, the reducing reagents, and the solvents used.Key Words: Ketones, alpha-silyl / vic-Diols, diastereo- and enantioselective synthesis / SAMP/RAMP Hydrazones / L-Selectride reductions

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

New research progress on 4254-15-3 in 2021.The transformation of simple hydrocarbons into more complex and valuable products via catalytic C–H bond functionalisation has revolutionised modern synthetic chemistry. Product Details of 4254-15-3, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 4254-15-3

Two new inclusion compounds of chiral guest molecules in chiral metal?organic framework (MOF) were obtained by soaking the crystalline [Zn2(dmf)(bdc)(S-lac)]·DMF (dmf = N,N-dimethylformamide; bdc = terephthalate; S-lac = S-lactate) in neat R-1,2-propanediol (R-pd) or S-1,2-propanediol (S-pd). Single crystal X-ray analysis for [Zn2(dmf)(bdc)(S-lac)]·R-pd (1) and [Zn2(S-pd)2(bdc)(S-lac)]·S-pd (2) showed that two enantiomers of the same alcohol react quite differently with the chiral porous framework, occupying different positions and form different types of interactions with the host. While the R-pd acts only as a guest molecule inside the channels, the S-pd coordinates to zinc cations of the framework and substitutes both guest and coordinated DMF of the original MOF. The chirality of 1,2-propanediol guest molecules has a considerable effect on luminescent properties of the [Zn2(dmf)(bdc)(S-lac)] host. The luminescence spectra of [Zn2(S-pd)2(bdc)(S-lac)]·S-pd and the original [Zn2(dmf)(bdc)(S-lac)]·DMF are almost identical while the luminescence spectra of [Zn2(dmf)(bdc)(S-lac)]·R-pd features new peak, compared with the original host. Also, the incorporation of alcohol guest molecules has different impact on quantum yields of the luminescence of the host, depending on the chirality of the isomer. In a more general prospect, such enantiomer-dependent luminescent properties of [Zn2(dmf)(bdc)(S-lac)] represent a chiral luminescence sensing, which is quite an extraordinary and rare phenomenon for chiral MOFs.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Application of 4254-15-3, Research speed reading in 2021. We’ll be discussing some of the latest developments in chemical about CAS: 4254-15-3 In a document type is Patent, and a compound is mentioned, 4254-15-3, Name is (S)-Propane-1,2-diol, introducing its new discovery.

There is provided a process for the hydrogenation of esters of alpha-substituted carboxylic acids which comprises reacting an ester of an alpha-substituted carboxylic acid with hydrogen in the presence of a catalyst under substantially homogeneous supercritical conditions. Preferably, the ester of an alpha-substituted carboxylic acids is an ester of formula (1): wherein: R1 and R2are each independently an optionally substituted hydrocarbyl group or an optionally substituted heterocyclic group; and Y is a heteroatom or an optionally substituted heteroatom group. More preferably, the ester of an alpha-substituted is carboxylic acids is an ester of formula (2): wherein: R3 is an optionally substituted hydrocarbyl group or an optionally substituted heterocyclic group; R4and R5 are each independently hydrogen, an optionally substituted hydrocarbyl group or an optionally substituted heterocyclic group; Y is a heteroatom or an optionally substituted heteroatom group; Q is a functional group; and n 1. Most preferably, the ester of an alpha-substituted carboxylic acids is an ester of formula (3): wherein: R3 and R6 are each independently an optionally substituted hydrocarbyl group or an optionally substituted heterocyclic group; R4 and R5 are each independently hydrogen, an optionally substituted hydrocarbyl group or an optionally substituted heterocyclic group; Y is a heteroatom or an optionally substituted heteroatom group; and n 1.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Synthetic Route of 4254-15-3, New research progress on 4254-15-3 in 2021. Redox catalysis has been broadly utilized in electrochemical synthesis due to its kinetic advantages over direct electrolysis. 4254-15-3, Name is (S)-Propane-1,2-diol, molecular formula is C3H8O2. In a article，once mentioned of 4254-15-3

1,3-Benzothiazin-4-ones (BTZs) are a novel class of TB drug candidates with potent activity against M. tuberculosis. An in silico ligand-based model based on structure-activity data from 170 BTZ compounds was used to design a new series. Compounds were tested against a panel of mycobacterial strains and were profiled for cytotoxicity, stability, and antiproliferative effects. Several of the compounds showed improved activity against MDR-TB while retaining low toxicity with higher microsomal, metabolic, and plasma stability.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

New research progress on 4254-15-3 in 2021. In classical electrochemical theory, both the electron transfer rate and the adsorption of reactants at the electrode control the electrochemical reaction. Computed Properties of C3H8O2, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 4254-15-3

The present invention discloses a novel process for the preparation of Dapagliflozin (S)-propylene glycol hydrate of Formula II. (Formula II)

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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We have assembled a set of combinatorial libraries of phosphoramidates for pharmacological evaluation. A range of functionalized and unfunctionalized diols, representing a variety of diversity elements, were converted into their corresponding dimethoxytrityl H-phosphonate derivatives which were coupled to each other to produce H-phosphonate dimers and trimers. The H-phosphonate diesters were converted into phosphoramidates by reaction with a wide range of primary and secondary amines. Very large libraries (theoretically, in excess of one million compounds) possessing five sites of diversity were generated for use in our drug discovery program. Smaller libraries with lower molecular weights were also prepared in which only two monomeric units were coupled together and converted into their phosphoramidate derivatives. Methods for the attachment of both radioactive and nonradioactive labels, including 32phosphorus, tritium, and fluorescein, have been developed. Representative single sequences were also prepared and their chemical properties studied.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Application of 24621-61-2, Chemical Research Letters, May 2021. The prevalence of solvent effects in heterogeneous catalysis in condensed media has motivated developing quantitative kinetic, spectroscopic. In a document type is Article, and a compound is mentioned, 24621-61-2, Name is (S)-Butane-1,3-diol, introducing its new discovery.

The hydrolytic dehalogenation of rac-1,3-dibromobutane catalyzed by the haloalkane dehalogenase LinB from Sphingobium japonicum UT26 proceeds in a sequential fashion: initial formation of intermediate haloalcohols followed by a second hydrolytic step to produce the final diol. Detailed investigation of the course of the reaction revealed favored nucleophilic displacement of the sec-halogen in the first hydrolytic event with pronounced R enantioselectivity. The second hydrolysis step proceeded with a regioselectivity switch at the primary position, with preference for the S enantiomer. Because of complex competition between all eight possible reactions, intermediate haloalcohols formed with moderate to good ee ((S)-4-bromobutan-2-ol: up to 87 %). Similarly, (S)-butane-1,3-diol was formed at a maximum ee of 35 % before full hydrolysis furnished the racemic diol product.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

New research progress on 24621-61-2 in 2021.The transformation of simple hydrocarbons into more complex and valuable products via catalytic C–H bond functionalisation has revolutionised modern synthetic chemistry. Quality Control of (S)-Butane-1,3-diol, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 24621-61-2

Stereoisomers of distinct chiral amino acids were observed to occur in L-enantioenriched form in carbonaceous chondrite meteorites. Meteoritic amines and monocarboxylic acids were recently shown to occur in racemic ratio. In this study we investigated the electronic circular dichroism and anisotropy spectra of chiral alcohols, chiral amines, and chiral monocarboxylic acids. We recorded circular dichroism and anisotropy spectra from 280 to 170 nm in aqueous solution using a synchrotron-radiation ultraviolet circular dichroism spectrophotometer. The obtained anisotropy spectra are employed to discuss the likely role of ultraviolet circularly polarized light leading to enantioenriched amino acids, as well as racemic amines and monocarboxylic acids during their primordial interstellar synthesis. These data will moreover accompany the European Space Agency’s Rosetta mission, which successfully landed Philae on the nucleus of comet 67P/Churyumov?Gerasimenko to search for chiral organic molecules.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

New research progress on 19132-06-0 in 2021. The appropriate choice of redox mediator can avoid electrode passivation and overpotential, which strongly inhibit the efficient activation of substrates in electrolysis. Product Details of 19132-06-0, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 19132-06-0

Stereoisomers of distinct chiral amino acids were observed to occur in L-enantioenriched form in carbonaceous chondrite meteorites. Meteoritic amines and monocarboxylic acids were recently shown to occur in racemic ratio. In this study we investigated the electronic circular dichroism and anisotropy spectra of chiral alcohols, chiral amines, and chiral monocarboxylic acids. We recorded circular dichroism and anisotropy spectra from 280 to 170 nm in aqueous solution using a synchrotron-radiation ultraviolet circular dichroism spectrophotometer. The obtained anisotropy spectra are employed to discuss the likely role of ultraviolet circularly polarized light leading to enantioenriched amino acids, as well as racemic amines and monocarboxylic acids during their primordial interstellar synthesis. These data will moreover accompany the European Space Agency’s Rosetta mission, which successfully landed Philae on the nucleus of comet 67P/Churyumov?Gerasimenko to search for chiral organic molecules.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

New research progress on 4254-15-3 in 2021.The transformation of simple hydrocarbons into more complex and valuable products via catalytic C–H bond functionalisation has revolutionised modern synthetic chemistry. SDS of cas: 4254-15-3, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 4254-15-3

The present invention provides a (S)- propylene carbonate synthesis method, comprises a batch charging, temperature reaction, cooling, decompression desolution of the reaction. The invention preparation of (S)- propylene carbonate, yield is 97%; the invention preparation of (S)- propylene carbonate, the specific optical rotation is – 2 – – 3; chemical pure content ? 99.8%; optical pure content ? 99.4%; isomer content ? 0.6%; water content ? 0.1%; the appearance is a colorless clear transparent liquid; from feeding to prepare crude product, the reaction time is 25 hours. (by machine translation)

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate