Chiral oxygen ligands

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MTOR-independent activator of TFEB for autophagy enhancement and uses thereof

The present invention relates to a composition comprising an autophagy enhancement compound. Small molecules that are able to enhance autophagy and lysosome biogenesis by activating the gene TFEB which can prevent the accumulation of toxic protein aggregates in treating neurodegenerative diseases are disclosed.

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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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Br¡ãnsted ionic liquids: Study of physico-chemical properties and catalytic activity in aldol condensations

A serie of substituted amines based ionic liquids was prepared using an aliphatic linear carboxylic acid (pentanoic acid). The ionic liquids synthesised are 2-hydroxy ethylammonium pentanoate (2-HEAPE), 2-hydroxy diethylammonium pentanoate (2-HDEAPE) and 2-hydroxy triethylammonium pentanoate (2-HTEAPE). FT-IR spectra establishes their ionic salt structure. The influence of structural variations on their thermodynamic properties (density, ultrasonic velocity, ionic conductivity, refractive index, viscosity and surface tension) was investigated, as a function of temperature in the range 278.15-338.15. K. In the compounds studied here, the anion has strong effect on the properties if compared with previous studies of the authors, when shorter chains were used. It was found that the elongation of the alkyl chain causes the pronounced depression of fluidity and ionic conductivity. The observed temperature trend of the studied properties points out the special packing of these ionic liquids, as well as, the strong influence of the steric hindrance among linear aliphatic residues. We also describe the catalytic activity of these type of ionic liquids for a representative serie of aldol condensation processes. Conversions higher than 98% and selectivities higher than 85% were obtained. Moreover the catalysts are easily separated from reaction mixture and re-used, obtaining good conversions for at least three consecutive cycles. As a conclusion, it was found that simple structural modifications into anion length and degree of substitution provide a mechanism to manipulate the catalytic potency of these ionic liquids, as well as, tailor physico-chemical properties for potential end-use applications.

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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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Synthesis and properties of new tris(cyanoethyl)phosphine complexes of platinum (0,II), palladium (0,II), iridium (I) and rhodium (I). Conformational analysis of tris(cyanoethyl)phosphine ligands

The tris(cyanoethyl)phosphine (tcep) complexes trans-[PtCl2(tcep)2], cis-[PtMe2(tcep)2], and trans-[PtMeCl(tcep)2] are prepared by treatment of the corresponding [PtXY(cod)] (cod = 1,5-cyclooctadiene) with tcep. Reduction of trans-[PtCl2(tcep)2] with NaBH4 gives trans-[PtHCl(tcep)2] which, in the presence of tcep and NEt3, gives the coordinatively unsaturated platinum(0) complex [Pt(tcep)3]. This coordinatively unsaturated species is also formed when [Pt(norbornene)3] reacts with tcep. [Pt(tcep)3] is very unreactive compared to its PEt3 analogue: it is air-stable and does not react with further tcep to form an 18-electron species. It is protonated by HBF4 ¡¤ OEt2 to form [PtH(tcep)3]BF4. The complex trans-[PdCl2(tcep)2] is made from [PdCl2(NCPh)2] and tcep and the derivatives trans-[PdX2(tcep)2] (X = Br or I) are made by metathesis of the dichloro complex. Reduction of trans-[PdCl2(tcep)2] with LiOMe in the presence of tcep gave the palladium(0) complex [Pd(tcep)3] which, like its platinum(0) analogue, undergoes exchange with free tcep on the NMR timescale. The palladium complex reacts with dibenzylideneacetone (dba) to form [Pd(eta2-dba)(tcep)2]; the same product is formed in the reaction of [Pd(eta2-dba)2] and tcep. Reaction of [Pd2Cl2(eta3-C3H3) 2] and tcep gives [PdCl(tcep)(eta3-C3H3)] or [Pd(tcep)2(eta3-C3H3)]Cl depending on stoichiometry. The rhodium(I) and iridium(I) complexes trans-[MCl(CO)(tcep)2], [MCl(tcep)(cod)] and [MCl(tcep)3] are all readily made from tcep and an appropriate precursor. All new compounds have been fully characterised by a combination of elemental analysis, IR, 31P, 13C, 1H and 195Pt NMR spectroscopy. The crystal structure of [IrCl(tcep)3] as a MeCN solvate shows a distorted square planar coordination geometry (trans angles at Ir(I) ca. 164, cis P-Ir-P av. 96, cis P-Ir-Cl av. 85). Analysis of the conformations of tcep ligands in this and other published tcep complexes shows there is a preference for conformations in which aaa, aag or g+g- (a = anti, g = gauche) arrangements of the three M-P-C-C chains are avoided.

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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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Kinetic Resolution of 1,2-Diols with D-Camphorquinone; Preparation of (R)-(Chloromethyl)oxirane

Acid-catalysed reaction of D-camphorquinone with racemic 1,2-diols (e.g. 3-chloropropane-1,2-diol) under kinetically controlled conditions yields a predominant diastereoisomeric acetal, that can be easily converted into an optically pure epoxide.

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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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Process for preparing enantiomerically pure propan-1,2-diols

The invention relates to a process for preparing enantiomerically pure S(+)-propan-1,2-diol and R(-)-propan-1,2-diol from L(-)-lactide or D(+)-lactide, respectively.

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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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Stereochemically Controlled Bakers’-Yeast-Mediated Reductions: Synthesis of (S)-(+)-1,2-Propanediol and (S)-(-)-1,3-Butanediol, 1-Benzyl Ethers

Benzyloxyketones 1a and b can be reduced by fermenting bakers’ yeast to the corresponding protected (S)-diols 2a and b in 76 and 52percent yields, respectively (90 and >95percent e.e., respectively, as (R)-(+)-MTPA esters).

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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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PRODUCTION OF OPTICALLY PURE PROPANE-1,2-DIOL

A method for producing optically pure propane-1,2-diol, including the method steps: a. hydrogenation of lactides, metal-catalysed heterogenous catalysis being carried out in the presence of hydrogen, a crude product containing propane-1,2-diol being produced, and b. dynamic, kinetic racemate resolution, propane-1,2-diol of an optical purity in the range of ?99% e.e. being produced.

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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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Stereoselective synthesis of ophiocerins A and C

An efficient synthesis of ophiocerins A and C has been achieved via a common intermediate. The stereogenic centers were generated by means of Jacobsen’s hydrolytic kinetic resolution and Sharpless kinetic resolution.

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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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Enantiospecific synthesis of norcoronamic acids

The synthesis of enantiomerically pure norcoronamic acids, starting from enantiomerically pure 1,2-propanediols, is described.

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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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HUMAN THERAPEUTIC AGENTS

Human therapeutic treatment compositions comprise at least two of a curcumin component, a harmine component, and an isovanillin component, and preferably all three in combination. The agents are effective for the treatment of human conditions, especially human cancers.

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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