1093results about How to "Short synthetic route" patented technology

The invention discloses a preparation method for binuclear acenaphthene (alpha-diimine) nickel / palladium catalysts for olefins and application of the catalysts in catalysis of polymerization of olefins. The binuclear acenaphthene (alpha-diimine) nickel / palladium catalysts for olefins in the invention have structural formulas as represented by formula (I) and formula (II) in the specification. The binuclear acenaphthene (alpha-diimine) palladium catalyst for polymerization of olefins has high activity and good stability and can be used for preparing high-molecular-weight hyperbranched polyethylene with bimodal distribution; the binuclear acenaphthene (alpha-diimine) nickel catalyst for polymerization of olefins has high activity and good stability and can be used for preparing polypropylene with a weight-average molecular weight of more than 100,000 and thermoplastic elastomers with elasticity and a high molecular weight. The preparation method for the synthesized catalysts used for polymerization of olefins has the advantages of a simple process, a short synthetic route, low cost, high yield and easy industrialization.

The invention relates to a vanadium dioxide intelligent temperature control film and a preparation method thereof. The preparation method comprises the following steps of: uniformly dispersing and dissolving vanadic oxide powder in an organic solvent with weak reductibility by adopting a wet chemical solution method; adding PVP (Polyvinyl Pyrrolidone) or PEG (polyethylene glycol) and a metal salt to prepare a doped VOx film (x is more than 2.0 and less than 2.5); and performing thermal treatment to form a doped porous hypovanadic oxide (VO2) film. In a better embodiment, the preparation method comprises the following steps of: adding polyvinyl pyrrolidone and a wolfram salt into a system consisting of vanadic oxide powder, benzyl alcohol and isopropyl alcohol to prepare a wolfram-doped VOx film; and annealing in hydrogen / argon atmosphere at the temperature 410 DEG C for 3 hours to prepare a wolfram-doped porous VO2 film, wherein the metal-insulator phase-transition temperature of the wolfram-doped porous VO2 film can be adjusted between 30 DEG C and 68 DEG C according to doping amount of wolfram, the penetration rate of a visible light region is 70 percent, the difference between the penetration rate before phase transition and the penetration rate after phase transition at the position of which the wavelength is 2,500 nanometers is 62 percent, 3-4 orders of magnitude of specific resistance is changed, and higher practical value is achieved.

The invention discloses a method for preparing artemisinin through arteannuic acid. The method comprises the steps that first the arteannuic acid is processed to obtain a dihydroartemisinic acid under the effect of a reducing agent such as sodium borohydride / nickel chloride or a hydrogen / metal catalyst, and then the dihydroartemisinic acid is oxidized into a peroxided dihydroartemisinic acid through peroxide in the presence of the catalyst, and finally the target product artemisinin can be obtained with high yield under the catalyzing of the acid and the effect of oxygen; or a dihydroartemisinic acid derivative can be obtained from the dihydroartemisinic acid based on the protection on carboxyl, and the dihydroartemisinic acid derivative is oxidized into a relevant peroxided dihydroartemisinic acid derivative through the peroxide in the presence of the catalyst, and then the target product artemisinin can be obtained with high yield under the catalyzing of the acid and the effect of the oxygen. Compared with the prior art, the method for preparing the artemisinin through the arteannuic acid has the advantages as follows: the used agent has low cost, and is easy to obtain; the synthetic route is short; the reaction selectivity is high; the preparation process is environmental-friendly; the operation and post-processing are simple; the total yield is high; and the method for preparing artemisinin through the arteannuic acid is applied to industrial production.

The invention discloses a synthesis method for N-Boc-3-piperidone. The synthesis method comprises the following steps of: reacting 3-hydroxyl pyridine with benzyl bromide in an organic solvent to obtain an N-benzyl-3-hydroxyl pyridine quaternary ammonium salt; reducing the N-benzyl-3-hydroxyl pyridine quaternary ammonium salt by sodium borohydride to obtain N-benzyl-3-hydroxyl piperidine; reacting N-benzyl-3-hydroxyl piperidine with di-tert-butyl dicarbonate ester to obtain N-Boc-3-hydroxyl piperidine under hydrogen protection and the catalysis of a palladium-carbon catalyst; and reacting N-Boc-3-hydroxyl piperidine with the mixed oxidant of dimethyl sulfoxide and oxalyl chloride to obtain N-Boc-3-piperidone under the action of an organic base. Compared with the existing synthesis method, the synthesis method disclosed by the invention is shorter in synthesis route, and easier for separation and purification of reactants, thus reducing the production cost, the energy consumption and the pollution; and the total productivity of N-Boc-3-piperidone can achieve more than 42%, and the purity thereof is greater than 98%.

The invention discloses a chaetocin salt and preparing method and drug composition with chaetocin salt, which possesses structure formula (I) on the right, wherein R is salt of inorganic oxyacid or organic monobasic acid group and metal, ammonium salt or organic amine. The invention improves solubility greatly, which prevents tumour effectively.

The invention discloses a tricarbazole-aromatic amine derivative cavity transmission material and a preparation method and application thereof. The tricarbazole-aromatic amine derivative cavity transmission material is a star-like micromolecule compound which uses tricarbazole as the core and uses aromatic amide derivative as a modifying group; a formula structure is shown in a formula I in the attached figure, wherein R is selected from one of C1 to C30 straight and branched alkyl or alkyl chains. The tricarbazole-aromatic amine derivative cavity transmission material has the advantages thatthe synthesis route is simple and short, the price of the reaction raw materials is low, the reaction process is easy to control, the separation is easy, the purity is high, and the yield rate is high; the cavity transfer rate is higher, and the dissolving property is good; especially, when the cavity transmission material is applied to a rovskite solar battery, the excellent photoelectric conversion efficiency is obtained; the novel cavity transmission material with excellent property and low cost can be applied to organic electroluminescent devices, organic solar batteries, perovskite solarbatteries or organic field effect transistor devices, and the important application potential is realized.

The invention discloses a preparation method for 3-aminomethyltetrahydrofuran. The preparation method comprises the following steps: with acrylonitrile as a starting material, carrying out an addition reaction with 2-halogenated ethyl alcohol so as to obtain an intermediate 2-haloethyl-2-nitrile ethyl ether; then subjecting the intermediate 2-haloethyl-2-nitrile ethyl ether to cyclic condensation so as to obtain an intermediate 3-nitrile tetrahydrofuran; and finally subjecting the intermediate 3-nitrile tetrahydrofuran to catalytic hydrogenation so as to obtain 3-aminomethyltetrahydrofuran. The preparation method provided by the invention has the advantages of cheap and easily-available starting material, short synthetic route, simple process operation, low production cost, little pollution to the human body and the environment, good yield and applicability to large-scale industrial production.

The invention discloses a preparation method of clobetasol and the preparation method of clobetasol propionate. The preparation method of the clobetasol comprises the following steps: by taking a compound I, namely 1,4,9(11)-triene androstane-3,17-diketone as an initial raw material, performing a methylation reaction, a cyan substitution reaction, a siloxy protection reaction, an intramolecular nucleophilic substitution reaction, a bromoepoxy reaction and a fluorination reaction to prepare a compound VII which is clobetasol. The compound VII is subjected to a propyl esterification reaction to prepare a compound VIII which is clobetasol propionate. According to the preparation method disclosed by the invention, since relatively basic initial raw materials which are cheap are used, each step of reaction is relatively easy to implement and high yield is achieved; the operation of multi-step protection and deprotection is simplified; moreover, 21 sites of fluorine are directly arranged in one step during arrangement of a side chain, and multiple steps of reaction for arranging the 21 sites of fluorine in the prior art are directly avoided, so that the synthetic route is greatly shortened, the total yield is increased, the product quality is improved and the production cost is greatly lowered.

The invention discloses a method for synthesizing lithocholic acid from cholic acid. According to the method, cholic acid is used as a starting raw material, and lithocholic acid is synthesized through the following four steps of reaction: selective protection of 3alpha-OH; oxidation of 7alpha-OH and 12alpha-OH into carbonyl groups; hydrolysis; and Huang Min-lon reduction. The raw material used in the method is easily available and cheap, and the method is few in synthesis steps and side reactions, simple in after-treatment, high in overall yield and suitable for industrial production.

The present invention provides a cefazedone sodium medicament powder injection composed of 100% of cefazedone sodium. The cefazedone sodium is prepared by a method as follows: (1) 7-ACA and 3, 5-dichloro pyridine acetic acid react with each other with the action of an anhydrating agent, a mixture after the reaction is post-processed to obtain an intermediate product I; (2) the intermediate productI and 2-mercapto-5-methyl-1, 3, 4-thiadiazoles react with each other with the protection of nitrogen at a temperature of 50 to 90 DEG C, a mixture after the reaction is purified to obtain a water solution which is added with an inorganic acid to regulate pH value to be equal to 1 to 3, a precipitation is extracted from the water solution and is post-processed to obtain cefazedone; (3) the cefazedone and sodium hydrogen carbonate react with each other in water to obtain a cefazedone sodium solid body after an aftertreatment. The powder injection has single component and perfect dissolution performance, the raw medicine has a short synthetic route, the aftertreatment of the intermediate product or final product are all simple, and the yield and purity of the whole reaction process are all high.