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Efficient synthesis of 3,4-ethylenedioxythiophenes (EDOT) by Mitsunobu reaction

Using the Mitsunobu reaction as a key step, a general and efficient method for the synthesis of EDOT monomers has been developed. Novel substituted EDOTs and the first chiral derivatives were generated in high yields.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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SUBSTITUTED BENZOTHIENYL – PYRROLOTRIAZINES AND USES THEREOF IN THE TREATMENT CANCER

This invention relates to novel substituted 5-(1-benzothiophen-2-yl)pyrrolo [2,1-fJ[1,2,4]triazin-4-amine derivatives having protein tyrosine kinase inhibitory activities, to processes for the preparation of such compounds, to pharmaceutical compositions containing such compounds, and to the use of such compounds or compositions for treating proliferative disorders, in particular cancer and tumor diseases

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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Solvent-induced chirality in the hydroboration of ketones

The influence of the systematic variation of chiral solvents and of diverse Lewis acids on the asymmetric induction of the hydroboration of acetophenone has been studied. None of the solvents used could surpass lactic acid methyl ester, and for the Lewis acids, ZnCl2 and ZnI2 showed positive effects on the enantiomeric excess (ee) and the conversion. Also, the effect of the substrate structure was investigated by comparing the conversion and ee of eight different ketones. Apparently, the achievable asymmetric induction was higher with aromatic ketones. CSIRO 2008.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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The result showed that such a combination of chemo- and biocatalysis improved the catalytic yield more than two times compared with that of sole metal catalysis.Related Products of 4254-15-3. I hope my blog about 4254-15-3 is helpful to your research.

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Synthesis of (3R,5S)-5-hydroxy-de-O-methyllasiodiplodin: A facile and stereoselective approach

A concise and facile synthesis of (3R,5S)-5-hydroxy-de-O-methyllasiodiplodin has been demonstrated in 12 steps starting from methylacetoacetate and (¡À)propylene oxide. The key reactions involved are Jacobsen’s hydrolytic kinetic resolution, Sharpless asymmetric epoxidation, Mitsunobu, and ring closing metathesis reaction for the construction of macrolactone with two chiral substitutions on it.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

Extracurricular laboratory:new discovery of (S)-Propane-1,2-diol

Therefore, this conceptually novel strategy might open impressive avenues to establish green and sustainable chemistry platforms.In my other articles, you can also check out more blogs about4254-15-3.Formula: C3H8O2

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Formula: C3H8O2, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 4254-15-3, name is (S)-Propane-1,2-diol. In an article£¬Which mentioned a new discovery about 4254-15-3

The prediction of the absolute stereochemistry of primary and secondary 1,2-diols by1H NMR spectroscopy: Principles and applications

The absolute configuration of 1,2-diols formed by a primary and a secondary (chiral) hydroxyl group can be deduced by comparison of the 1H NMR spectra of the corresponding (R)- and bis-(S)-MPA esters (MPA = methoxyphenylacetic acid). This method involves the use of the chemical shifts of substituents L1/L2 attached to the secondary (chiral) carbon, and of the hydrogen atom linked to the chiral center (Calpha-H) as diagnostic sig nais. Theoretical (AM1, HF, and B3LYP calculations) and experimental data (dynamic and low-temperature NMR spectroscopy, studies on deuterated derivatives, constant coupling analysis, circular dichroism (CD) spec tra, and NMR studies with a number of diols of known absolute configuration) prove that the signs of the DeltadeltaRS obtained for those signals correlate with the absolute configuration of the diol. A graphical model for the reliable assignment of the absolute configuration of a 1,2-diol by comparison of the NMR spectra of its bis-(R)- and bis-(S)-MPA esters is presented.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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Characterization of carboxylic acid reductases for biocatalytic synthesis of industrial chemicals

Carboxylic acid reductases (CARs) catalyze the reduction of a broad range of carboxylic acids into aldehydes, which can serve as common biosynthetic precursors to many industrial chemicals. This work presents the systematic biochemical characterization of five carboxylic acid reductases from different microorganisms, including two known and three new ones, by using a panel of short-chain dicarboxylic acids and hydroxy acids, which are common cellular metabolites. All enzymes displayed broad substrate specificities. Higher catalytic efficiencies were observed when the carbon chain length, either of the dicarboxylates or of the terminal hydroxy acids, was increased from C2 to C6. In addition, when substrates of the same carbon chain length are compared, carboxylic acid reductases favor hydroxy acids over dicarboxylates as their substrates. Whole-cell bioconversions of eleven carboxylic acid substrates into the corresponding alcohols were investigated by coupling the CAR activity with that of an aldehyde reductase in Escherichia coli hosts. Alcohol products were obtained in yields ranging from 0.5 % to 71 %. The de novo stereospecific biosynthesis of propane-1,2-diol enantiomer was successfully demonstrated with use of CARs as the key pathway enzymes. E. coli strains accumulated 7.0 mm (R)-1,2-PDO (1.0 % yield) or 9.6 mm (S)-1,2-PDO (1.4 % yield) from glucose. This study consolidates carboxylic acid reductases as promising enzymes for sustainable synthesis of industrial chemicals.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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Stereoselectivity of Baker’s yeast reduction of 2-propanones: influence of substituents.

The stereoselectivity of Baker’s yeast reduction of prochiral alpha-oxygenated 2-propanones has been studied by varying the substrate structure. The 1-hydroxy-3-methoxy-3-propanone 1a was reduced to the corresponding alcohol (R)-2a with 88% enantiomeric excess. Replacing the hydroxy group in 1a with phenoxy or benzyloxy (1b and 1c) gave the alcohols (S)-2b and (S)-2c with 53 and 32% ee, respectively. Reduction of the methyl ketone 1d gave the alcohol (S)-2d with 91% ee. Attempts to improve the enantioselectivity of the reduction of 1c by lowering the substrate concentration or addition of selective reductase inhibitors had only small effect on the enantioselectivity.

The result showed that such a combination of chemo- and biocatalysis improved the catalytic yield more than two times compared with that of sole metal catalysis.Recommanded Product: (S)-Propane-1,2-diol. I hope my blog about 4254-15-3 is helpful to your research.

Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Application In Synthesis of (S)-Propane-1,2-diol, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. Application In Synthesis of (S)-Propane-1,2-diol, Name is (S)-Propane-1,2-diol, molecular formula is C3H8O2. In a Article, authors is Dey, Sangeeta£¬once mentioned of Application In Synthesis of (S)-Propane-1,2-diol

Double-cuvette ISES: In situ estimation of enantioselectivity and relative rate for catalyst screening

Described is a new method for the screening of an array of catalysts, in situ, to estimate enantioselectivity and relative rates. We term this approach “double-cuvette ISES (in situ enzymatic screening)”. The Co(III)-salen mediated hydrolytic kinetic resolution (HKR) of (¡À)-propylene oxide is used as a model reaction to demonstrate proof of principle. In two parallel cuvettes, a lower CHCl3-based organic layer is loaded with the epoxide and the chiral salen catalyst. Aqueous reporting layers, containing distinct “reporting enzymes” and their nicotinamide cofactors, are layered above the organic layers. The 1,2-propanediol enantiomers formed by the chiral catalyst diffuse into the aqueous layer and are oxidized there by the reporting enzymes at rates dependent upon the diol concentration, the R:S ratio of the diol, and the enantioselectivity of the reporting enzymes. A focused chiral salen library was constructed from seven chiral 1,2-diamines, derived from amino acid, terpenoid, and carbohydrates skeletons, and seven salicylaldehyde derivatives. Double-cuvette ISES identified a couple of interesting combinatorial hits in this salen array, wherein either the sense or magnitude of enantioselection for a given chiral diamine depends significantly upon the choice of “salicylaldehyde” partner. A comparison of predicted ee’s and relative rates using this new screening tool with those independently measured is provided. Copyright

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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COA of Formula: C3H8O2, Interested yet? Read on for other articles about COA of Formula: C3H8O2!

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A General Route to Enantiomerically Pure Sulfoxides from a Chiral Sulfite

Enantiomerically pure cyclic chiral sulfite (S)-7 (trans stereochemistry) has been easily obtained in two steps from (S)-ethyl lactate.This compound was found to react cleanly with many organometallics to give crystalline sulfinates with high regioselectivity (>90:10).Addition of a second organometallic transforms the purified sulfinate in excellent yield into a chiral sulfoxide (100percent ee) of predictable absolute configuration.The mechanism and scope of this approach are discussed.This method completes the various other methdos of preparation of chiral sulfoxides and is especially convenient for the preparation of tert-butyl sulfoxides.Examples for the synthesis of many chiral tert-butyl sulfoxides are given.The case of chiral sulfites derived from a C2 diol or of a chiral monoalcohol is also proposed as a route to chiral sulfinates, and some promising preliminary results have been obtained.The general main route to obtain chiral sulfoxides from sulfites are also discussed.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

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Asymmetric hydrogenation of alpha-hydroxy ketones catalyzed by MsDPEN-Cp*Ir(III) complex

Asymmetric hydrogenation of a series of alpha-hydroxy aromatic ketones in methanol catalyzed by Cp*Ir(OTf)(MsDPEN) (MsDPEN = N-(methanesulfonyl)-1, 2-diphenylethylenediamine) affords the 1-aryl-1,2-ethanediols in up to 99% ee. The reaction can be conducted with a substrate-to-catalyst molar ratio at high as 6000 under 10 atm of H2-1-Hydroxy-2-propanone is also hydrogenated with high enantioselectivity.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate