187results about How to "Simplified post-processing steps" patented technology

The invention relates to a preparation method for a particle diameter controllable millimeter-scale polyurea monodisperse microsphere. The preparation method comprises the following steps: isocyanate compound is adopted as a monomer and is squeezed through syringe needles or capillary tubes to form liquid drops and the liquid drops are added into water or a polyamine aqueous solution for sedimentation and polymerization; during the settlement process of the liquid drops, the monomers on the surfaces of the liquid drops react with the water or the polyamine aqueous solution rapidly to form a gelatin layer or callus and the stability of particles is maintained. According to the method, as water is adopted as the dispersion medium, no pollution is generated; the polymerization reaction can be conducted under lower temperature, the equipment is simple and the manufacturing cost is low; the obtained microsphere is free from residual monomer and the post-processing is simple; no surface modified agent or pore-foaming agent is needed, porous polyurea microsphere with rich amino on the surface is prepared in one step; the method can be used in the fields of enzyme immobilization, chemocatalysis, dye, adsorption and separation of heavy metal ions and the like.

The invention discloses a preparation method of 3-(4-chlorobutyl)-5-cyanoindole which is shown as the formula IV. The preparation method comprises the steps as follows: carrying out following carbonyl reduction reaction on a compound III and a hydroboron reducing agent in the solvent under the catalyzing of Lewis acid to obtain the product, wherein Lewis acid is one or more of aluminium trichloride, magnesium chloride, zinc chloride and ferric chloride; and the hydroboron reducing agent is one or more of sodium borohydride, potassium borohydride, lithium borohydride and borane. The preparation method disclosed by the invention is safe in operation, low in requirement on equipment, low in cost, simple in post-processing steps, high in yield of product, high in purity, and is suitable for industrialization.

The invention relates to a covalent organic framework material, a preparation method therefor and a method for synthesizing N,N'-di(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenediformamide by using thecovalent organic framework (COFs) catalyst. The method comprises the specific steps: subjecting dimethyl isophthalate and 2,2,6,6-tetramethyl-4-aminopiperidine to a heterogeneous catalytic reaction with stirring in an organic solvent by taking the covalent organic framework material (COFs) as a catalyst, and carrying out aftertreatment after the reaction ends up, thereby obtaining the product. The catalyst has sufficient alkaline loci and can be used for effectively catalyzing the reaction and remarkably increasing yield; and after the catalyst is used, treatment steps are simpler, the emission of salt-bearing wastewater is reduced, heavy-metal pollution is avoided, and the catalyst is environmentally friendly.

A preparative circulating chromatography apparatus can be applied in chromatographic separation preparation of target components in a complex sample and is mainly advantaged in that: (1) with pre-treatment and concentration of an on-line sample, large-volume sampling on the premise of a high column efficiency can be achieved; (2) through position exchange between a separation column and a trapping column, circulating separation and purification of the target components are achieved and the preparative circulating chromatography apparatus is less in circulating dead volume and column efficiency loss; and (3) through concentration-elution of a finish product through the trapping column, a separation-concentration integrated process is achieved, wherein the three functions are achieved through adjustment of an adsorption performance of the trapping column and valve exchange. Compared with a conventional preparative chromatography method, the apparatus has significant advantages on separations of natural products, drugs and chemical products, especially on separation and preparation of micro-scale targeted components and unstable components in a mixture.

The invention provides a levalbuterol intermediate and a levalbuterol hydrochloride synthesis method, and relates to a levalbuterol intermediate and a method for preparing levalbuterol hydrochloride from the intermediate. The method comprises steps as follows: 2-halogenate-1-(2,2-dimelthyl-4-hydrogen-benzo [d][1,3] dioxane)-butanone and organic amine have a Hoffman alkylation reaction to prepare a compound in the formula 2, the structural formula of the compound is shown in the specification, and the compound in the formula 2 is subjected to a reduction reaction, optically pure organic acid resolution and deprotection by hydrochloric acid to obtain levalbuterol hydrochloride. The method does not need processes of protection or deprotection and the like of hydroxyl groups on a benzene ring, protection, deprotection and purification processes are reduced, the synthesis route is short, operation is simple, meanwhile, borane-thioether does not need to be used as a reduction agent, and safety and environmental protection are realized.

The invention provides a preparation method of 2,5-furandicarboxylic acid, which comprises the following steps: under air and/or oxygen conditions, putting 5-hydroxymethylfurfural and a catalyst intoa mixed solution of water and an organic solvent, and carrying out catalytic oxidation reaction to obtain the 2,5-furandicarboxylic acid, wherein the catalyst comprises a carrier and an active component loaded on the carrier; the active component is one or more selected from ruthenium, palladium, platinum and rhodium; the carrier is one or more selected from activated carbon, graphite, fullerene and graphene oxide. The mixed solution of water and the organic solvent is used as the solvent so that solubility of the product 2,5-furandicarboxylic acid is increased, efficient conversion of 5-hydroxymethylfurfural is achieved without adding an alkaline additive to increase the solubility, high-selectivity 2,5-furandicarboxylic acid is obtained, and the method is simple in operation method, mildin reaction condition, environmentally friendly, free of pollution and good in industrial application prospect.

The invention discloses application of imine reductase and a mutant thereof in synthesis of (S)-1-aryl-1, 2, 3, 4-tetrahydroisoquinoline, and belongs to the field of enzyme engineering. The imine reductase provided by the invention is one of the following enzymes: IR45, IR96 and IR99 as shown in SEQ ID NO. 1-3, having corresponding coding nucleotides preferably as shown in SEQ ID NO. 1-3; the mutant of the imine reductase is one of mutants IR45-W191A and IR45-W191L of IR45 and mutant IR99-L173Aof IR99. The imine reductase or the mutant thereof can catalyze a compound of formula I to synthesize a compound of formula II, wherein R in the formula I and the formula II is hydrogen, methoxy or halogen; the catalysis efficiency is high; the obtained target product has high optical purity, simple post-processing and good environmental-protection and safety.

The invention discloses an improved method for extracting phytosterol from asphalt of vegetable oil. The method has a simple process, high product purity and low product cost. The improved method comprises the following steps: (1) the asphalt of the vegetable oil is heated and melted at a temperature of between 80 and 100 DEG C, is added with alkali and water, is kept at the temperature, is continuously stirred and saponified for 0.5 hour, is added with hot water, is continuously heated, reflows and reacts for 1.5 to 2.5 hours; a saponification reaction solution is cooled and delaminated; the collected unsaponified layer is added with alcohol with 2 to 3 times of the weight of the raw material of the asphalt, is added with alkali, is heated to a temperature of between 75 and 85 DEG C, reflows for 3 to 5 hours and is stopped to heat and stir; after the solution is cooled to the temperature of 50 DEG C, the solution is added with hot water and continuously reacts and reflows for 10 to 30 minutes; and after the solution is fully cooled, the phytosterol is precipitated out and filtered to obtain a coarse product of the phytosterol; and (2) the coarse phytosterol is eluted through an organic solvent; a filtrate evaporation solvent is put to a vacuum dry box and is dried at a temperature of between 50 and 60 DEG C to obtain the phytosterol product.

The invention discloses a preparation method of apixaban and intermediates thereof. The invention provides a preparation method of an apixaban intermediate I. The preparation method of the apixaban intermediate I comprises the step of performing nucleophilic substitution reaction on an apixaban intermediate II and p-fluoronitrobenzene in an organic solvent in the presence of an alkali to obtain the apixaban intermediate I. The preparation method has short steps, simple and safe operation, simple post-treatment steps, environmental friendliness and high total yield, and the obtained product hashigh purity, low production cost and high atomic utilization, and is suitable for industrial production. The formula is shown in the description.

The invention relates to a method for preparing 4-phenyl-cyanophenyl. The method mainly comprises the steps of: carrying out Friedel-Crafts acylation on biphenyl which is a starting material to obtain 1-chloroacetyl-4-phenyl-benzene; carrying out ammonolysis reaction on the 1-chloroacetyl-4-phenyl-benzene to obtain 4-phenyl-benzamide; and carrying out dehydration reaction on the 4-phenyl-benzamide in the presence of a dehydrating agent to obtain the target product. The method is characterized in that (1) a catalyst used in the Friedel-Crafts acylation reaction is imidazole ionic liquid; and (2) the dehydrating agent used in the dehydration reaction is a mixture of triphosgene and ammonium salt, the molar ratio of the triphosgene to the ammonium salt is 1:(0.05-0.1), and the ammonium salt is organic ammonium salt or/and inorganic ammonium salt. The method for preparing the 4-phenyl-cyanophenyl with better commercial value is provided by the invention.

An alpha-chloro-fatty acid preparation method belongs to the organic compound synthesis technical field. The invention takes chlorosulfonic acid as main catalyst, sulfur trioxide as complementary catalyst which is added in a continuous flow way, and uses oxygen in the air to replace pure oxygen to serve as free radical capture agent; the method enables fatty acid and chlorine to be reacted in an atmospheric pressure reactor so as to develop an ideal industrial production method for alpha-chloro-fatty acid production. The alpha-chloro of the invention has high reactivity, good reaction selectivity, high conversion rate, less side reaction products, as well as high purity of products so as to guarantee the catalytic activity in the reaction process and effectively prevent the increasing of the using amount of catalyst caused by decomposition of the main catalyst to result in waste; the method can reduce the insecure factors brought about by pure oxygen in industrial production and can avoid the increase of post-processing steps of products due to the introduction of chemical antioxidants.

The invention discloses a method for preparing sugammadex sodium. The method is characterized in that perhalogeno gamma-cyclodextrin and 3-mercaptopropionic acid or/and a sodium salt thereof are subjected to a replacement reaction in a sodium base-reducing agent-organic solvent system for preparing sugammadex sodium, the method effectively controls the formation of process impurities with similarstructure of sugammadex sodium from a reaction process, and obtains high-yield and high-purity product after simple post-treatment. The invention further provides a method for purifying of a crude product of the sugammadex sodium and conversion of impurities to the target product in a one-step reaction, which is simple, efficient and wasteful, the method improves the yield and purity from variousaspects, and solves the problems of complex operation, high requirements on instruments and low yield in the prior art method, and is suitable for industrial mass production of the sugammadex sodium.

The invention relates to a preparation method of 2-(methyl sulphonyl)-10H-phenothiazine and belongs to the technical field of medical intermediate preparation. According to the method, parachlorobenzenesulfonyl chloride and sodium salt of 2-bromothiophenol are taken as starting materials, two novel intermediates M1 and M3 not reported are involved, ideal schemes different from related references are explored in all experimental procedures, and particularly the cyclization process for synthesis of the final product 2-(methyl sulphonyl)-10H-phenothiazine completely breaks through various restrictions in literatures. The method has the advantages that the whole process is simple in step, convenient to operate, mild in reaction condition and easy to control, product yield in all the steps is high and the like, thereby being suitable for industrial production and having high value in use and social and economic benefits.

The invention discloses a method for synthesizing a bisphenol A ethoxy compound, which comprises the following steps: adding bisphenol A and a catalyst of dimethyl aminoethanol into a reactor, raising the temperature to a reaction temperature of between 110 and 125 DEG C by stirring and the protection of inert gas; and adding epoxyethane into the mixture to react at a pressure of between 0.1 and 0.35 MPa for 1 to 20 hours to prepare the bisphenol A ethoxy compound. The reaction equation is shown as follows, wherein n is between 1 and 5. The method achieves the solid polymerization of the bisphenol A and the epoxyethane, and selects the novel dimethyl aminoethanol as the catalyst so that the product is free from postprocessing. The product of the bisphenol A ethoxy compound has the advantages of shallow color phase which ranges from 10 to 30, no existence of metallic ions, 0.05 to 0.1 ppm of peroxide and the like.