33results about How to "Simple post-reaction handling" patented technology

The invention discloses a method for preparing polyol by using bio-oil. The method comprises the following steps: firstly performing methyl esterification, namely, performing ester exchange on biolipid and methanol under the catalysis of potassium fluoride loaded magnesium oxide solid alkali, converting the obtained product into fatty acid methyl ester with small molecular weight and byproduct glycerol, filtering to recycle the catalyst, and separating lower-layer glycerol; performing epoxidation on upper-layer fatty acid methyl ester in 30% of hydrogen peroxide under the catalysis of ionic liquid so as to form epoxidized fatty acid methyl ester.; then adding the glycerol in the methyl esterification process, continuously performing alkoxide ring-opening under the catalysis of ionic liquid, introducing hydroxyl, and finally separating liquid to recycle the ionic liquid catalyst, reducing pressure and distilling the upper-layer to remove water so as to obtain low-viscosity bio-oil-based polyol. The raw material is easily available, recyclable and good in biodegradability, the preparation process is environmental friendly, the industrial three-waste emission is small, the product structure and a hydroxyl value are adjustable, the application range is wide, and the environment influence level is low.

The invention discloses a method for preparing diphenyl carbinol and derivatives thereof. In an alkali and solvent environment, diphenyl ketone and derivatives thereof are subjected to a hydrogenation reaction in the presence of a transition metal complex serving as a catalyst to form the diphenyl carbinol and derivatives thereof, wherein the general formula of the transition metal complex is MLnL'XY and is a transitional metal pnictide formed by a ligand having a NH2-N(SP2) or NH2-NH2 structural characteristic and a transition metal. When the method for preparing the diphenyl carbinol and derivatives thereof is used, a small amount of catalyst is used, the reaction process is stable, the conversion rate is over 98 percent, the very few by-products are produced in the reaction, the treatment after reaction is simple, the whole process period is short, the cost is low, and the large-scale production can be realized easily.

The invention discloses a method for asymmetric synthesis of a 3,3-disubstituted-2-oxindole compound. The method is characterized in that a 3-monosubstituted-2-oxindole compound and a 1,4-naphthoquinone compound as reaction raw materials undergo a reaction in the presence of chiral organic catalysts in air to produce the 3,3-disubstituted-2-oxindole compound. The method has mild reaction conditions and adopts easily available raw materials. The 3,3-disubstituted-2-oxindole compound obtained by the method has a very high ee value, provides a key skeleton structure for the synthesis of many natural products and drugs, and can be widely used for large-scale industrial production.

The invention relates to a preparation method of a hexahydro-pyrrolo [3,4-c] pyrrole-1-ketone derivative, which mainly solves the technical problems of long route, low yield, difficult purification and difficult repetition and amplification of reaction of the conventional synthesis method. The preparation method comprises the following steps of: firstly, performing a 1,3-dipolar cycloaddition on monoethyl maleate and N-methoxy-methyl-N-(trimethylsilyl methyl) benzyl amine which serve as raw materials to obtain a benzyl-protected pyrrole ring so as to finish a basic skeleton of an intermediate; secondly, reducing carboxylic acid into hydroxyl groups by using borane, converting the hydroxyl groups into activated ester by using methane sulfonyl chloride, and alkylating 'N'; and finally, reducing azido ester groups under a hydrogenation condition, and closing the ring to obtain the hexahydro-pyrrolo [3,4-c] pyrrole-1-ketone derivative. The hexahydro-pyrrolo [3,4-c] pyrrole-1-ketone derivative prepared by the method is a useful intermediate or product of the synthesis of a number of medicaments.

The invention provides a (3R)-2-iodo-4-benzyloxy-3-methyl-1-ene compound as well as a preparation method and an application thereof, more particularly relates to a novel compound ERP-2 as well as a preparation method and an application thereof, also provides a novel preparation method of ERP ((3R)-2,4-diiodo-3-N-methyl butylamine-1-ene) and relates to use of the novel compound ERP-2. According tothe method, compared with the prior art, the yield and the quality of ERP-1 and ERP are notably increased when ERP-1 and ERP are prepared through the compound ERP-2, hazardous articles such as dimethylzinc or dimethyl aluminum are not required in the reaction process, expensive Hoveyda-Grubbs catalysts, Amano lipase PS-8000 and the like are not required, aftertreatment of a reaction is simple, theproduction cost is greatly saved, the production safety is improved, and the method is more suitable for industrial production.

The invention discloses a synthesizing method of a chiral spiro oxindole dihydropyran derivative. The synthesizing method comprises the following steps of using dihydropyran (pyran) and isatin-derived beta,gamma-unsaturated alpha-keto ester as reaction matters; under the existence of a chiral (Box) / Cu(II) complex, synthesizing in a benzotrifluoride solvent to obtain a product. The synthesizing method disclosed by the invention has the advantages that the raw materials are simple, the obtaining is easy, the reaction condition is mild, the post-treatment is simple and convenient, the applicable substrate range is broad, the yield is high, and the enantioselectivity and non-enantioselectivity are high; the synthesized product has potential medical value.

The invention discloses a method for preparing polyol by using bio-oil. The method comprises the following steps: firstly performing methyl esterification, namely, performing ester exchange on biolipid and methanol under the catalysis of potassium fluoride loaded magnesium oxide solid alkali, converting the obtained product into fatty acid methyl ester with small molecular weight and byproduct glycerol, filtering to recycle the catalyst, and separating lower-layer glycerol; performing epoxidation on upper-layer fatty acid methyl ester in 30% of hydrogen peroxide under the catalysis of ionic liquid so as to form epoxidized fatty acid methyl ester.; then adding the glycerol in the methyl esterification process, continuously performing alkoxide ring-opening under the catalysis of ionic liquid, introducing hydroxyl, and finally separating liquid to recycle the ionic liquid catalyst, reducing pressure and distilling the upper-layer to remove water so as to obtain low-viscosity bio-oil-based polyol. The raw material is easily available, recyclable and good in biodegradability, the preparation process is environmental friendly, the industrial three-waste emission is small, the product structure and a hydroxyl value are adjustable, the application range is wide, and the environment influence level is low.

The invention provides a synthesizing method of (R)-4-nitrophenethyl-(2-hydroxy-2-phenylethyl)-tert-butyl carbamate, and belongs to the technical field of medicine synthesis. The method assists in solving problems of low product yield, requirement on column chromatographic separation, and unsuitability for large-scale industrial productions of (R)-4-nitrophenethyl-(2-hydroxy-2-phenylethyl)-tert-butyl carbamate synthesizing methods in prior art. The method comprises the steps that: (1) hydroxyl group on p-aminophenylethanol is oxidized into aldehyde group, such that nitrobenzene acetaldehyde is obtained; (2) (R)-2-amino-1-phenylethanol is subjected to reductive amination, such that (R)-2-p-nitrobenzene ethylamine-1-phenylethanol is obtained; and (3) (Boc)2O is used for substituting the amino group on (R)-2-p-nitrobenzene ethylamine-1-phenylethanol, such that the final product is obtained. With the method, production cost is low, and finished product yield is high. The method is suitable for large-scale industrial productions.

The invention discloses a mixed base catalyst catalysis-based bisphenol anti-oxidant preparation method and use. The preparation method comprises putting dialkyl-substituted phenol and an aldehyde compound into an enclosed reactor, carrying out a reaction process on the mixture in the presence of a mixed base catalyst under the condition of use or no use of an organic solvent and carrying treatment on the reaction product to obtain a bisphenol anti-oxidant after the reaction. The bisphenol anti-oxidant can be used for preparation of a lubricating oil composition, a fuel oil composition or an inhibitor of plastic and rubber. The preparation method of the bisphenol anti-oxidant has simple processes and mild conditions, utilizes cheap and easily available raw materials with a wide source, has a short reaction period, is convenient for control, has high technical safety, low production energy consumption, a high yield and high product purity, can effectively control and reduce pollutant discharge and is a novel technology with advantages of safety, energy saving and environmental friendliness.

The invention relates to a preparation method and application of mannose-grafted trimethyl chitosan.The preparation method comprises: adding N,N,N-trimethyl chitosan into an organic solvent so that the organic solvent wells, adding mannopyran phenyl isothiocyanate for full reacting, and preparing N-mannose-N,N,N-trimethyl chitosan by ethanol washing, suction filtering and vacuum drying.The invention also provides application of the preparation method of the mannose-grafted trimethyl chitosan in the preparation of drug-carrying microspheres.The preparation method of a mannose-grafted trimethyl chitosan carrier has mild conditions, and a prepared mannose-grafted trimethyl chitosan drug-carrying microsphere preparation can target dendritic cells, overcoming mucosal barriers.

The invention discloses a method for synthesis of phenylacetic acid by carbonylation of benzyl chloride. The key technology includes that: a 2-(4-amino-2-hydroxyphenyl)benzimidazole metal complex as shown in the structural formula (I) is used as a main catalyst in the reaction process, M is Co2+, Cu2+, and Zn2+, and benzimidazole Schiff base is used as a catalytic additive. The catalytic system is simple in synthesis process, has excellent catalytic activity for carbonylation of benzyl chloride, and is small in usage amount, easy to operate, low in cost, and easy for product postprocessing purification. Reaction conditions are mild and easy to achieve, and the reaction temperature is only 60-70 DEG C.

The invention discloses an energetic material 4, 4, 8, 8-tetranitroadamantane-2, 6-dinitrate and a preparation method thereof. According to the preparation method, cyclooctadiene as the raw material undergoes the steps of hydroboration-oxidation, oxidation, formylation, cyclization, nitric acid esterification, oximation, germinal nitration and the like to be finally synthesized into 4, 4, 8, 8-tetranitroadamantane-2, 6-dinitrate. Polynitroadamantane and adamantine nitrate have the advantages of symmetrical structure, high density, excellent explosion property, low sensitivity and the like, and can be widely used in the fields of explosives, propellants, pyrotechnic compositions, fuels and the like.

The invention discloses a method for synthesizing dicyclohexyl crown ether compounds. Using catechol compounds and dichloroethyl ether as starting materials, through the Pedersen synthesis method, cyclization produces dibenzo-18-crown-6 ether compounds, and then undergoes catalytic hydrogenation to form dicyclohexyl- 18‑Crown‑6 ether compounds. The main feature of the present invention is that the heterogeneous metal catalyst is used to efficiently convert the dibenzocrown ether into the dicyclohexyl crown ether. After the reaction is completed, the product only needs simple treatment such as filtration and concentration, and the purity can reach more than 90%. The heterogeneous metal catalyst used is convenient to prepare, low in price, and can be recycled.

The invention discloses a method for preparing diphenyl carbinol and derivatives thereof. In an alkali and solvent environment, diphenyl ketone and derivatives thereof are subjected to a hydrogenation reaction in the presence of a transition metal complex serving as a catalyst to form the diphenyl carbinol and derivatives thereof, wherein the general formula of the transition metal complex is MLnL'XY and is a transitional metal pnictide formed by a ligand having a NH2-N(SP2) or NH2-NH2 structural characteristic and a transition metal. When the method for preparing the diphenyl carbinol and derivatives thereof is used, a small amount of catalyst is used, the reaction process is stable, the conversion rate is over 98 percent, the very few by-products are produced in the reaction, the treatment after reaction is simple, the whole process period is short, the cost is low, and the large-scale production can be realized easily.

The invention provides a (R)-4-amino phenethyl-(2-hydroxy-2-phenylethyl)-tert-butyl carbamate synthesis method, and belongs to the technical field of drug synthesis. With the present invention, problems of low product yield, complex treatment steps, heavy environment pollution and the like of the synthesis method in the prior art are solved. The synthesis method comprises the following steps that: hydroxyl on p-nitrophenylethanol is oxidized into aldehyde to obtain p-nitrophenylacetaldehyde; amino on (R)-2-amino-1-phenylethanol and the aldehyde on the p-nitrophenylacetaldehyde are subjected to dehydration condensation reduction to obtain (R)-2-p-nitrophenylethylamine-1-phenylethanol; (Boc)2O is adopted to replace amino on the (R)-2-p-nitrophenylethylamine-1-phenylethanol; and nitro on (R)-4-nitro phenethyl-(2-hydroxy-2-phenylethyl)-tert-butyl carbamate is reduced into amino so as to obtain the final product. The synthesis method has characteristics of low production cost, high product yield, and low environmental pollution.

The invention discloses a synthesis method for 2,2,4,4,6,6-hexanitro-adamantane. According to the method, diethyl malonate is used as a raw material, and the steps of cyclization, ozonization and the like with complex aftertreatment and low yield in the traditional route are avoided by a new route; and in the new route, N2O5 is used as a nitration agent in a nitration step, and the advantages of fast reaction speed, easily-controlled reaction temperature, easily-separated products, high product purity, capacity of effectively reducing waste acid, and the like are achieved. The method is lower in cost, less in reaction pollution and higher in yield compared with the traditional route, the reaction yield is increased to 14% from 0.5% of the original route, and possibility is provided for industrialized production for 2,2,4,4,6,6-hexanitroadamantane.

The invention discloses a method for asymmetric synthesis of a 3,3-disubstituted-2-oxindole compound. The method is characterized in that a 3-monosubstituted-2-oxindole compound and a 1,4-naphthoquinone compound as reaction raw materials undergo a reaction in the presence of chiral organic catalysts in air to produce the 3,3-disubstituted-2-oxindole compound. The method has mild reaction conditions and adopts easily available raw materials. The 3,3-disubstituted-2-oxindole compound obtained by the method has a very high ee value, provides a key skeleton structure for the synthesis of many natural products and drugs, and can be widely used for large-scale industrial production.

The invention discloses a synthesis method of chiral spiro-oxindole dihydropyran derivatives, specifically, dihydrofuran (pyran) and isatin derivatives β , gamma -Unsaturated α The -ketoester is a reactant, and under the catalysis of a chiral (Box) / Cu(II) complex, the product is synthesized in a trifluorotoluene solvent. The method disclosed by the invention has simple and easy raw materials, mild reaction conditions, simple and convenient post-treatment, wide range of applicable substrates, high yield, high enantioselectivity and diastereoselectivity; the product synthesized thereby has potential medicinal value.