69results about How to "Reaction conditions green" patented technology

The invention discloses a method for preparing benzaldehyde through styrene catalytic oxidation, which comprises the following steps: using styrene as a reactant and a gold nano-wire of which the diameter is less than or equal to 5 nanometers as a catalyst, reacting at a temperature of between 80 and 100 DEGC for 20 to 48 hours in a normal pressure oxygen atmosphere in the presence of a solvent, and cooling and separating the mixture after the reaction to obtain the benzaldehyde, wherein the solvent is methylbenzene. The method has the advantages of higher conversion rate, higher benzaldehyde yield, and milder and greener reaction conditions.

The invention relates to a green conjugated double bond reduction method capable of taking water as a solvent and dihydropyridine ester as a hydrogen source, and selectively reducing the conjugated double bond with strong electron-withdrawing groups. By adopting the method, conjugated carbon-carbon double bonds with strong electron-withdrawing groups are selectively reduced by taking water as the solvent and the dihydropyridine ester as the hydrogen source under the condition that no catalyst is needed. The method comprises the following steps: (1) adding a compound of conjugated carbon-carbon double bonds with strong electron-withdrawing groups and the dihydropyridine ester to water according to the molar ratio of (1:1) to (1:3), heating and warming to 60-100 DEG C; stirring and reacting for 5-24 hours at the temperature; (2) adding an organic solvent to the solution obtained in the step (1) to extract for at least three times according to the volume ratio of 2:5; (3) merging, drying and carrying out reduced pressure distillation on an organic layer of the product obtained in the step (2), and then carrying out column chromatography, so as to obtain the reduced product. The green conjugated double bond reduction method has the advantages of being non-toxic, mild in reaction condition, free of adding of a catalyst, high in chemical selectivity and the like.

The invention provides a gold nanocluster using transferrin as template, and a preparation method and application thereof. The preparation method of the nanoclusters comprises the following steps: respectively configuring aqueous solutions of HAuCl4 and Tf, mixing them according to the molar ratio of 20-60:1, stirring for 2-5 minutes at room temperature, adjusting the pH of the mixed solution to 12 with NaOH solution, placing the solution in a microwave reactor and sealing, reacting at 70-90 DEG C for at least 50 minitues to obtain AuNCs@Tf emitting intense red fluorescence. The nanoclusters of the invention can be used for detecting copper ions, and can be applied to a copper ion detection test paper to visualize the detection of copper ions. The nanoclusters of the invention can also beused for detecting glutathione, and the cell experiment shows that the nanoclusters can target lysosomes to recognize cancer cells. The nanoclusters of the invention can also be used for encrypting and decrypting fingerprint information.

The invention relates to carboxylic acid derivatization beta-carboline and a preparation method of the carboxylic acid derivatization beta-carboline. The method comprises the steps that organic solvent is added into the mixture of 6-methyl-beta carbazoline, metal-salt catalyst and initiator, oxygen is introduced, and after stirring reaction is conducted, the reaction is terminated; filtering is conducted, and solid crude products are collected; further purification of the crude products is conducted through recrystallization and silica gel column chromatography to obtain products. According tothe method, reaction conditions are mild, the application range of substrates is wide, and a large number of beta-carboline derivatives with diversified structures can be obtained.

The invention belongs to the technical field of fine chemical engineering, and discloses preparation and catalytic application of a donor-acceptor type ionic porous polymer. The polymer AN-POP-1 is prepared through a Zincke reaction. An anthracene ring structure is introduced into 1,1'-bis(2,4-dinitrophenyl)-[9,10-bis(3-pyridyl)anthracene]-1,1'-diammonium dichloride, so that the photocatalytic performance is improved; the preparation method comprises the following steps: adding 1,1'-bis(2,4-dinitrophenyl)-[9,10-bis(3-pyridyl)anthracene]-1,1'-diammonium dichloride and 1,3,5-tri(4-aminophenyl)triazine C into a schlenk tube, and reacting for 48-72 hours under the protection of nitrogen at 100-150 DEG C to obtain the polymer AN-POP-1 catalyst. The AN-POP-1 polymer prepared by the invention hasgood chemical and thermal stability and relatively high catalytic performance, and the catalytic yield of a benzylamine derivative can reach 90% or above.

The invention belongs to the technical field of organic synthesis, and provides a preparation method of novel 4-phosphoryl-1, 4, 5-trisubstituted 1, 2, 3-triazole. According to the preparation method,in an organic solvent, under the action of a tetracarbonyl rhodium dichloride dimer [Rh(CO)2Cl]2 catalyst, an alkynyl phosphate compound and azide are catalyzed to prepare the 4-phosphoryl-1, 4, 5-trisubstituted 1, 2, 3-triazole. By the preparation method of the 4-phosphoryl-1, 4, 5-trisubstituted 1, 2, 3-triazole product, provided by the invention, a reaction condition is mild and the product yield is not lower than 67%. With the preparation method, the reaction condition is mild and environmentally friendly, the reaction efficiency is high, a large-scale production requirement is met better, and the prepared 4-phosphoryl-1, 4, 5-trisubstituted 1, 2, 3-triazole compound has potential physiological activity.

The invention discloses a preparation method of sulfophenyl pyrazolone. The method consists of: taking a compound (I) as the raw material, in the presence of alkali, subjecting the compound (I) and a compound (II) to substitution reaction, then conducting oxidation by an oxidizing agent to obtain a compound (III), esterfying the compound (III) to obtain a compound (IV), subjecting the compound (IV) to thionation to obtain a compound (VI), conducting oxidation and hydrolysis (or hydrolysis, oxidation) on the compound (VI) to obtain a compound (VII), subjecting the compound (VII) to acyl chlorination, subjecting the obtained acyl chloride (VIII) and 1, 3-dimethyl-5-hydroxypyrazole to esterification reaction so as to obtain a compound (IX), and finally carrying out rearrangement on the compound (IX) to obtain a compound (X). The method provided by the invention has the advantages of cheap and easily available raw materials, high reaction conversion rate, few three wastes, and is beneficial to industrial production.

The invention belongs to the technical field of organic synthesis, and relates to a preparation method of a novel dihydropyrone coumarin compound. The preparation method comprises the following steps:in tetrahydrofuran, takingtriphenyl phosphine as a ligand and1,4-diazabicyclo[2.2.2] octane as an alkali, and under the catalytic action of Pd(OAc)2, reacting a dihydropyrone compound with a 3-cyano-4-methyl coumarin compound to prepare the 3-cyano-4-(6-dihydropyrone) methyl coumarin. The preparation method is mild in reaction condition, and the product yield is not lower than 52%. The inventionprovides a preparation method for obtaining dihydropyrone coumarin with excellent regioselectivity and high stereoselectivity by a simple and effective method. The preparation method is mild in reaction condition, green, high in reaction efficiency and more suitable for large-scale production requirements, and the prepared dihydropyrone coumarin compound is a compound with potential physiologicalactivity.

The invention provides a synthetizing method of a coumarin compound. The coumarin compound is mildly and efficiently prepared by using a phenols compound with a substituent group and methyl acrylate as raw materials, performing a reaction in 1,4-dichlorobutane under the action of a catalyst of Pa(II)-Cu(II), a ligand and weak alkali, and performing a C-C coupling reaction. The synthetizing method disclosed by the invention is simple and convenient, is easy to operate, is high in conversion rate, and is higher in yield; fewer by-products are generated in a synthetizing process, the synthetizing method conforms to the requirements of green chemistry, and the synthetizing method is mild and efficient, so that the synthetizing method is suitable for industrial production.

The invention belongs to the field of photochemical organic synthesis, and particularly relates to a photochemical catalytic synthesis method of an aromatic olefin compound, which comprises the following steps: in the presence of light, a photocatalyst, a cocatalyst, a ligand, alkali and a hydrogen donor, carrying out C = C reduction reaction on an aromatic alkyne compound to obtain the aromatic olefin compound. The highest yield of the reaction system product can reach 83%.

The invention discloses an aqueous phase catalyzed Sonogashira cross-coupling reaction and separation and purification method. The method includes adopting molecular sieve-supported palladium as a catalyst, water as a solvent and quaternary ammonium base as a base to conduct high-efficiency palladium catalysis carbon-carbon bond cross coupling reaction to synthesize an alkyne compound. At higher temperature, catalysis can be completed in 3 minutes, so that a catalyst can conduct catalysis on a fluid bed. The catalyst can be directly reused after being separated in the recycling process, and can be reused for more than 10 times without reducing the activity. An emulsifier and the quaternary ammonium base can also be recycled. A catalytic product can be directly crystallized and precipitatedin the system, and a pure product is obtained by a filtration washing method. The step of column chromatography is omitted, and the experimental operation is simple and safe. In addition, the reaction system has good universal applicability to a reaction substrate and has great practical application value.

The invention provides a diaryl acetate compound and a preparation method, and the preparation method comprises the following steps: (1) adding a diary 1, 2-diketone compound, an alcohol compound, trialkyl phosphite and a photocatalyst into a reaction vessel, adding a solvent, and dissolving to obtain a reaction solution; (2) irradiating an reaction liquid by using a light source and stirring until the reaction is complete; and (3) after the reaction is finished, recovering the solvent under reduced pressure and purifying by column chromatography to obtain the diaryl acetate compound. Startingfrom easily available diaryl 1, 2-diketone, the method has the advantages of mild and green reaction conditions, no need of precious transition metal catalysis, economical performance, environmentalprotection, and high practicality.

The invention discloses a dynamic and static combined stirring system. The system comprises a stirrer and further comprises a plurality of static stirring paddles parallel to a stirring shaft of the stirrer, the static stirring paddles are arranged around the stirring shaft, and stirring blades are installed at the bottom of the stirring shaft. In addition, the invention further discloses a process for preparing a chromium salt through chromite liquid phase oxidation by adopting the dynamic and static combined stirring system. The invention provides a novel process for preparing a chromium salt by using the chromite liquid phase oxidation method, the key process problems of solid-liquid separation in the chromite leaching process, separation of the chromium salt in a high-alkali medium andconversion of an intermediate product into a series of chromium salts are innovatively solved, and the method has a great industrial application prospect.

The invention discloses a preparation method of (2S, 3S)-3-amino-N-cyclopropyl-2-hydroxyhexanamide hydrochloride, and belongs to the technical field of preparation of a medical intermediate. The chiral product of the (2S, 3S)-3-amino-N-cyclopropyl-2-hydroxyhexanamide hydrochloride is obtained by performing the five reaction steps, including epoxidation, resolution, ring opening, esterification and amination, on trans-2-hexenoic acid serving as an initial raw material, wherein water is used as a reaction solvent in the first step of epoxidation. By adoption of the technology, the preparation method has the advantages of convenience in operation, mild reaction conditions, cheap and readily available used raw materials, low toxicity, high product purity reaching over 99.4 percent, high e.e. (Enantionmeric Excess) value reaching over 99.5 percent, low equipment requirement and suitability for large-scale industrial production.

The invention belongs to the technical field of organic synthesis, and provides a preparation method and application of a novel 5-thiocyanate substituted 1,4,5-trisubstituted 1,2,3-triazole. The preparation method of the 5-thiocyanate substituted 1,4,5-trisubstituted 1,2,3-triazole and a preparation method of 5-thio-1,4,5-trisubstituted 1,2,3-triazole have mild reaction conditions, and the productyields are not less than 62%. The preparation methods have the mild reaction conditions, are environmentally friendly and have high reaction efficiency, and the methods are more suitable for large-scale production requirements; and the prepared 5-thio-1,4,5-trisubstituted 1,2,3-triazole compound has potential physiological activity.

The invention discloses a preparation method of an alpha-acyloxy ketone compound, which comprises the following steps of adding a 1, 3-dicarbonyl compound, carboxylate and a catalyst alkyl halide into an organic solvent, and stirring and reacting for 0.5-1 hour at the temperature of 20-30 DEG C to obtain a reaction product, namely a mixture, performing purification treatment on the mixture to obtain alpha-acyloxy ketone, wherein the molar ratio of the 1, 3-dicarbonyl compound to the carboxylate to the alkyl halide is 1: 1: 1. According to the method, carboxylate with low cost is selected as an acyloxylation reagent, reaction conditions are mild and green, a 1, 3-dicarbonyl compound is taken as a raw material, and a novel method for efficiently, simply and conveniently constructing a C-O bond is successfully realized through activation of a carbonyl alpha-position C-H bond and subsequent cascade reaction, so that a series of alpha-acyloxyketone compounds are obtained.

The invention discloses a cellulose supported heterojunction catalytic material and a method for preparing chiral boride, and the method for preparing the chiral boride comprises the following steps: mixing alpha, beta-unsaturated ester I, bis (pinacolato) diboron, a catalytic material Cell (at) CuTi and a ligand, adding toluene and water, and carrying out asymmetric boronation reaction of the alpha, beta-unsaturated ester. The catalytic material Cell (at) CuTi has high catalytic activity and stable properties, can be applied to catalysis of asymmetric boron addition reactions of different types of alpha, beta-unsaturated esters, and has the advantages of small catalyst dosage, mild reaction conditions, no need of using a large amount of organic solvents, high product yield and high enantioselectivity; the reaction is carried out at room temperature in an air environment, anhydrous and anaerobic operation is not needed, and the method is simple, convenient and wide in application and has the advantage of a one-pot method; and the catalytic material can be repeatedly used and has potential industrial application value.