206 results about "Cyclotide" patented technology

Peptide-based compounds including heteroatom-containing, three-membered rings efficiently and selectively inhibit specific activities of N-terminal nucleophile (Ntn) hydrolases. The activities of those Ntn having multiple activities can be differentially inhibited by the compounds described. For example, the chymotrypsin-like activity of the 20S proteasome may be selectively inhibited with the inventive compounds. The peptide-based compounds include at least three peptide units, an epoxide or aziridine, and functionalization at the N-terminus. Among other therapeutic utilities, the peptide-based compounds are expected to display anti-inflammatory properties and inhibition of cell proliferation.

In one aspect, the present disclosure encompasses polymerization systems for the copolymerization of CO2 and epoxides comprising 1) a catalyst including a metal coordination compound having a permanent ligand set and at least one ligand that is a polymerization initiator, and 2) a chain transfer agent having two or more sites that can initiate polymerization. In a second aspect, the present disclosure encompasses methods for the synthesis of polycarbonate polyols using the inventive polymerization systems. In a third aspect, the present disclosure encompasses polycarbonate polyol compositions characterized in that the polymer chains have a high percentage of —OH end groups and a high percentage of carbonate linkages. The compositions are further characterized in that they contain polymer chains having an embedded polyfunctional moiety linked to a plurality of individual polycarbonate chains.

The methods of the present invention comprise the steps of: providing a feedstock stream comprising an epoxide and carbon monoxide; contacting the feedstock stream with a metal carbonyl in a first reaction zone to effect conversion of at least a portion of the provided epoxide to a beta lactone; directing the effluent from the first reaction zone to a second reaction zone where the beta lactone is subjected to conditions that convert it to a compound selected from the group consisting of: an alpha beta unsaturated acid, an alpha beta unsaturated ester, an alpha beta unsaturated amide, and an optionally substituted polypropiolactone polymer; and isolating a final product comprising the alpha-beta unsaturated carboxylic acid, the alpha-beta unsaturated ester, the alpha-beta unsaturated amide or the polypropiolactone.

The present invention relates to a polylactic acid with improved impact strength, comprising, by weight:60% to 97% of polylactic acid (PLA), and3% to 40% of a mixture of compounds A and B in which:A is a copolymer of ethylene and of an unsaturated monomer bearing at least one epoxide or carboxylic acid or carboxylic acid anhydride function, and optionally of alkyl (meth)acrylate,B is a copolymer of ethylene and of alkyl (meth)acrylate,said mixture having a weight % (A) / weight % (A+B) ratio of between 0.10 and 0.49.The present invention also relates to the manufacture of components or objects from these compositions.

Disclosed are compounds produced by a process comprising the step of reacting an amine reactant with an epoxide reactant to form a hydrolytically stable carbon-nitrogen bond therebetween, wherein at least one of the amine or epoxide reactants comprises a terminal alkoxysiyl group. Also disclosed are curable compositions comprising the compounds of the present invention and the cured products derived therefrom.

Peptide-based compounds including heteroatom-containing, three-membered rings efficiently and selectively inhibit specific activities of N-terminal nucleophile (Ntn) hydrolases associated with the proteasome. The peptide-based compounds include an epoxide or aziridine, and functionalization at the N-terminus. Among other therapeutic utilities, the peptide-based compounds are expected to display anti-inflammatory properties and inhibition of cell proliferation. Oral administration of these peptide-based proteasome inhibitors is possible due to their bioavailability profiles.

Peptide-based compounds including heteroatom-containing, three-membered rings efficiently and selectively inhibit specific activities of N-terminal nucleophile (Ntn) hydrolases. The activities of those Ntn having multiple activities can be differentially inhibited by the compounds described. For example, the chymotrypsin-like and PGPH activities of the 20S proteasome can be selectively inhibited with the inventive compounds. The peptide-based compounds include at least three peptide units, an epoxide or aziridine, and functionalization at the N-terminus, such as a detectable label. Along with therapeutic utilities, these peptide based compounds can be used in assays useful for screening, monitoring, diagnostic and / or dosing purposes.

The present invention relates to the isolation and use of an allene oxide synthase enzyme as an antioxidant of lipid peroxides in biological systems. It is based, at least in part, on the discovery that antioxidation is accomplished enzymatically by RPP, a species of allene oxide synthase, in guayule, and on the discovery that the allene oxide synthase RPP disrupts the chain reaction and propagation steps of lipid peroxidation. The present further invention relates to the use of an allene oxide synthase to result in a time-dependent disappearance of conjugated dienes (i.e. lipid hydroperoxides). The allene oxide synthase rapidly converts free or esterified fatty acid peroxides or hydroperoxides into their corresponding epoxides, which, in turn are converted to ketols. The lipid peroxide and hydroperoxide substrates for this enzyme are known to be toxic to biological organisms and can generate additional peroxides by chain propagation reactions. In the presence of an allene oxide synthase these compounds are rapidly and effectively converted to allene oxides (the epoxide), thus breaking the chain reaction.

The present invention relates to halocarbon and halohydrocarbon chemistry, including methods of dehalogenating halocarbons and halohydrocarbons to provide, inter alia, alcohols, polyols, and epoxides. In general, the methods involve reaction pathways catalyzed by altered hydrolase enzymes that can provide stereoselective or stereospecific reaction products. The invention also includes methods of providing altered nucleic acids that encode altered dehalogenase or other hydrolase enzymes. Additionally, the invention includes various reaction formats and kits.

This invention relates to a method of preparing poly(alkylene carbonate) that has a molecular weight and polymer chain structure precisely controlled by adding a chain transfer agent composed of a compound having an alcohol or carboxylic acid functional group upon alternating copolymerization of an epoxide compound and carbon dioxide using a catalyst composed of a trivalent metal complex compound synthesized from a quaternary ammonium salt-containing Salen type ligand, and to a polymer compound prepared thereby. According to this invention, the polymer compound having a star-shaped chain as well as the polymer having a linear chain can be prepared. The low-molecular-weight poly(alkylene carbonate) has an —OH terminal group and can be used alone as a coating agent, etc., and also in mixtures with an isocyanate compound and thus can be easily utilized to prepare polyurethane.

The invention relates to a catalytic composition comprising: a first component which is at least a component with one or more metals from groups 3A, 4A, 5A, 6A, 7A, 8, 1B, 2B, 3B, 4B; and a second component selected from (1) at least one ionic liquid which consists of a compound formed by cations and anions and which is a liquid at ambient temperature, (ii) a matrix to which the first component is bound or on which it is supported, and (iii) a combination of the two. The invention relates to the use of said catalytic composition in a method for the insertion of carbon dioxide into an organic compound and, preferably, a compound selected from epoxides, acetals and orthoesters. The invention also relates to catalytic compositions comprising said metallic compounds.

The invention provides aliphatic-aromatic copolyester, a preparation method and application thereof. Polymerization monomers comprise a compound selected from aliphatic dibasic acid, and naphthenic base dibasic acid or the ester, the anhydride and the acyl halide thereof, a compound selected from aromatic dibasic acid or the ester, the anhydride and the acyl halide thereof, a compound simultaneously with two functional groups selected from an amino-group, a mercapto group or a hydroxy or a compound of a derivative of the amino-group, the mercapto group or the hydroxyl with an epoxy group and an azepine ring, a compound selected from unsaturated acid with at least one C-C, C-O, C-N or C-S double bond and C-C or C-N triple bond or the ester, the anhydride and the acyl halide thereof and a compound of unsaturated alcohol with at least one C-C double bond or a C-C triple bond or an epoxide thereof. The aliphatic-aromatic copolyester is prepared by carrying out esterification and polycondensation after mixing the polymerization monomers, polymerizing the double bonds and / or the triple bonds on the polymerization monomers under the action of an initiator and then carrying out a graftingand / or coupling reaction.

The invention discloses a Lewis acid-base pair catalytic initiator and application thereof. The Lewis acid-base pair catalytic initiator comprises a Lewis acid and a Lewis base, the structural generalformula of the Lewis acid is shown in formula (I), and the structural general formula of the Lewis base is shown in formula (II-1) or (II-2); in the formula, A is selected from an element B or an element Al; R1, R2, R3 and R4 are independently selected from alkyl, alkoxy, aryl or halogen; the carbon number of the alkyl or alkoxy is 1-16; the aryl contains 0-5 substituents selected from methyl, methoxy or halogen; and n is an integer from 1 to 16. The Lewis acid-base pair catalytic initiator can be used for catalyzing epoxide homopolymerization reaction and epoxide copolymerization reaction, and has extremely high catalytic activity.

Poly(ester-acrylate) and poly(ester / epoxide) dendrimers. These materials can be synthesized by utilizing the so-called “sterically induced stoichiometric” principles. The preparation of the dendrimers is carried out by reacting precursor amino / polyamino-functional core materials with various branch cell reagents. The branch cell reagents are dimensionally large, relative to the amino / polyamino-initiator core and when reacted, produce generation=1 dendrimers directly in one step. There is also a method by which the dendrimers can be stabilized and that method is the reaction of the dendrimers with surface reactive molecules to pacify the reactive groups on the dendrimers.

The present disclosure provides novel methods of making aluminum complexes with utility for promoting epoxide carbonylation reactions. Methods include reacting neutral metal carbonyl compounds with alkylaluminum complexes.

The invention provides a preparation method of aliphatic polycarbonate polyol. The preparation method comprises the following steps: carrying out copolymerization on carbon dioxide and an epoxy compound in the presence of a metalloporphyrin complex and a chain transfer agent to obtain aliphatic polycarbonate polyol, wherein the metalloporphyrin complex is as shown in a formula (I) or a formula (II), the quaternary ammonium salt, the quaternary phosphorus salt or the organic base group with great steric hindrance of the metalloporphyrin complex ensure that an electronic environment of ligand is more conducive to the stabilization of a metal active center, and after the metalloporphyrin complex and the chain transfer agent jointly act on the copolymerization, the content of the obtained by-product cyclic carbonate is low. Experimental results show that the content of the cyclic carbonate in the aliphatic polycarbonate polyol prepared by the preparation method is lower than 3%; and in addition, the content of carbonate in polycarbonate polyol prepared by the preparation method is as high as 85%-98%.

A process for preparing a hybrid polyester-polyether polyol comprises contacting a carboxyl group-containing component and an epoxide, optionally in the presence of one or more of a double metal cyanide catalyst, a superacid catalyst, a metal salt of a superacid catalyst and / or a tertiary amine catalyst, under conditions such that a hybrid polyester-polyether polyol is formed. The hybrid polyester-polyether polyol offers the advantages of both ester and ether functionalities when used in a polyurethane formulation, thus enhancing physical properties. The process results in products having narrow polydispersity, a low acid number and unsaturation, and reduced byproduct formation, particularly when the double metal cyanide catalyst is employed.

Peptide-based compounds including heteroatom-containing, three-membered rings efficiently and selectively inhibit specific activities of N-terminal nucleophile (Ntn) hydrolases. The activities of those Ntn having multiple activities can be differentially inhibited by the compounds described. For example, the chymotrypsin-like activity of the 20S proteasome may be selectively inhibited with the inventive compounds. The peptide-based compounds include an epoxide or aziridine, and functionalization at the N-terminus. Among other therapeutic utilities, the peptide-based compounds are expected to display anti-inflammatory properties and inhibition of cell proliferation.

Compositions suitable for use as wood adhesives are described, which compositions comprise: (a) a polymeric component selected from the group consisting of lignins, proteins, and mixtures thereof, (b) an adhesion promoter comprising at least one component selected from the group consisting of (i) adducts of an epoxide and a resin selected from the group consisting of polyamine resins, polyamidoamine resins, polyamide resins, and combinations thereof, and (ii) combinations of a curing agent and a compound having at least one amine, amide, imine, imide, or nitrogen-containing heterocyclic functional group capable of reacting with at least one functional group of the polymeric component; and (c) an additive selected from the group consisting of urea, N-substituted ureas, N,N-disubstituted ureas, N,N′-disubstituted ureas, N,N,N′-trisubstituted ureas, N,N,N′,N′-tetrasubstituted ureas, urea derivatives, and mixtures thereof.

The invention discloses a fluorine-containing titanium-silicon molecular sieve with a MWW (Manual Wire Wrap) structure and a preparation method and an application thereof. In the molecular sieve, a fluorine atom is connected with a framework silicon atom in the form of a chemical bond, an XRD (X-Ray Diffraction) spectrogram contains a characteristic spectral line of the molecular sieve with the MWW structure, and characteristic peaks of -150+ / -5ppm and -143+ / -5ppm appear in a 19FMAS-NMR (19 File Management Assistant For Server-Nuclear Magnetic Resonance) spectrogram; the preparation method comprises the following steps of: synthesizing a boron-containing parent body, post-treating, baking and the like; and the molecular sieve serving as a catalyst is applied to catalytic oxidation reactions of compounds containing carbon-carbon double bonds and at least one other functional group as well as reactions for catalytically synthesizing oxime. The molecular sieve has a complete crystalline state structure; according to the electronic effect of framework fluorine, the molecular sieve and higher catalytic oxidation capability; a preparation process is simple, and is easy for industrial production; synthesis of corresponding epoxides or catalytic synthesis of oxime from compounds containing carbon-carbon double bonds and at least one other functional group can be catalyzed at higher activity and high selectivity; and a reaction process is environmentally-friendly.

The present invention relates to a process comprising the steps of reacting in the presence of an epoxide opening catalyst, a substituted epoxide, and preferably a silicone containing substituted epoxide with at least one carboxylic acid and at least one protecting agent to form a vicinal dialkyl ester or a vicinal disilyl ester.

The present invention is directed to processes from producing beta-lactone and beta-lactone derivatives using heterogenous catalysts. In preferred embodiments of the present invention, the processes comprise the steps: passing a feed stream comprising an epoxide reagent and a carbon monoxide reagent to a reaction zone; contacting the epoxide reagent and the carbon monoxide reagent with a heterogenous catalyst to produce a beta-lactone product in the reaction zone; and removing the beta-lactone product from the reaction zone. In preferred embodiments, the heterogenous catalyst comprises a solid support containing a cationic Lewis acid functional group and a metal carbonyl compound comprising at least one of anionic metal carbonyl compound or a neutral metal carbonyl compound. In certain preferred embodiments, the epoxide reagent and carbon monoxide reagent have a biobased content.

There is provided a surfactant composition, a stable, self emulsifiable water borne curing agent composition, and methods for the manufacture of each, and two component water borne curable epoxy resin compositions. The surfactant composition comprises the reaction product of an a) a phenolic acid substituted with at least one carboxyl group and at least one hydrocarbyl group having at least 1 carbon atom; b) a polyepoxide compound; c) a polyamine compound having at least two primary amine groups; d) a reactive surfactant; and optionally e) a monoglycidyl, monocarboxylic acid, or monoisocyanate capping agent; wherein the reactive surfactant comprises an epoxide, a carboxylic acid or anhydrides thereof, or an isocyanate functional moeity, and a hydrophilic moiety comprising a polyoxyalkylene monool or polyol residue. The reactive surfactant comprises a compound represented by one of the following formulas:

The present invention provides artemisinic epoxide, and methods of synthesizing artemisinic epoxide in a genetically modified host cell. The present invention further provides methods for producing artemisinin. The present invention further provides variant enzymes that catalyze the oxidation of amorpha-4,11-diene to artemisinic epoxide; nucleic acids encoding the variant enzymes; as well as recombinant vectors and host cells comprising the nucleic acids.

The invention provides a gene engineering bacteria for producing dehalogenase and realizes the industrial production of dehalogenase industrialised by culturing the gene engineering bacteria via fermentation technology. The invention also provides the use of the gene engineering bacteria; and the halogenohydrin dehalogenase produced by the gene engineering bacteria can be applied to ring-opening reaction of ortho-halogenohydrin dehalogenation epoxidation and epoxide.