110results about How to "Simple and mild reaction conditions" patented technology

The invention relates to in-situ crosslinked alginate hydrogels with an active ingredient of disulfide bond disulfide bond alginate derivative. The preparation method thereof is as follows: the organic liquids of carbodiimide hydrochloride and N-hydroxysuccinimide eater are added into the alginate aqueous liquid of the alginate to activate the carboxyl of the alginate aqueous liquid; then the organic liquid of 4-aminothiolphenol is added under the conditions of keeping in dark place under 10 DEG C and nitrogen protection, so that the amino of the 4-aminothiolphenol and the carboxyl of the alginate aqueous liquid form an amido bond. The proportions of each matter adjusted and the pH value of muriatic acid is adjusted to 6.0, ethanol is deposited, frozen and dried to obtain sulfhydrylation alginates of different sulfydryl contents. The alginate aqueous liquid of the alginate oxidizes the sulfydryl thorugh the oxygen in the liquid under a room temperature to crosslink and form a disulfide bond, thus obtaining the crosslinked alginate hydrogels. The hydrogels prepared through the method has pH sensitivity and reduction responsiveness, and has potential application values in drug delivery field.

The invention discloses a synthesis method of beta, beta-diaryl alkene, which comprises the following steps that: in an organic acid solvent, in the presence of a palladium catalyst and a silver salt, a halogenated aromatic hydrocarbon and an end alkenyl compound are subjected to a coupling reaction to obtain the beta, beta-diaryl alkene, wherein the organic acid solvent is acetic acid, the palladium catalyst is palladium acetate, the silver salt is silver acetate, silver carbonate or silver oxide, the halogenated aromatic hydrocarbon is iodo aromatic hydrocarbon, and the coupling reaction is operated at a reaction temperature of 80 to 130 DEG C for 0.25 to 24 hours. With the method, the environmentally friendly organic acid is used as the solvent, and the silver salt is used as an additive; and the method has the advantages of small amount of catalyst, mild reaction conditions, simple post-treatment, and high yield of a product, without adding other ligands and the like.

The invention discloses a method for catalytically asymmetrically synthesizing a chiral beta-aminoketone derivative. The method includes taking a chiral binaphthol derivative shown in a formula (3) asa catalyst; and in the presence of an organic solvent and an additive, preforming, by potassium trifluoroborate shown in a formula (2), an asymmetric 1,4-addition reaction on a beta-phthalimide acrylone compound shown in a formula (1) to generate the beta-aminoketone derivative containing one chiral center shown in a formula (4), wherein the reaction formula is shown in the specification. The invention discloses a new chiral catalyst of a polyfluoroaphthol skeleton, adopts nonmetallic catalysis, avoids the use of metal catalysts from the source, and reduces the reaction cost. The yield and enantioselectivity of the target product are high, the reaction conditions are simple and mild, and a method for preparing multiple chiral beta-aminoketone derivatives is provided, so that the method has better application prospect and social value.

The invention discloses a preparation method of quercetin-loaded nano-selenium. The quercetin-loaded nano-selenium comprises the following raw materials: a reducing agent, a reaction solution and a selenium source, wherein quercetin is used as the reducing agent, sodium selenite (Na2SeO3) is used as the selenium source, the reaction solution contains a stabilizer and a mixed solvent of methanol and water, and the stabilizer is gum arabic (As). The preparation method comprises the following specific steps: preparing nano selenium particles for loading quercetin, firstly preparing the reaction solution containing the stabilizer, adding quercetin and sodium selenite substance into the reaction solution, stirring and reacting for a period of time at room temperature, then adding a proper amount of tween 80, continuously stirring, removing methanol by rotary evaporation, and freeze-drying to obtain the quercetin-loaded nano-selenium. The invention further discloses application of the quercetin-loaded nano-selenium in treating Alzheimer's disease. The invention aims to provide a preparation method and application of a medicament for treating Alzheimer's disease.

The invention discloses a method of using alkaline earth metal hydrides to reduce carbon dioxide to prepare a hydrogen-methane mixed fuel. According to the method, in an argon atmosphere, alkaline earth metal hydrides are placed in a ball mill tank, argon is extracted from the ball mill tank, highly pure CO2 gas is filled into the ball mill tank, and a ball milling machine is adopted to carry out ball milling reactions at a room temperature to obtain the hydrogen-methane mixed fuel. The method can prepare hydrogen-methane mixed gas at a room temperature, a novel method is provided for high density storage and preparation of methane, and a novel technology, which can carry out carbon dioxide methanation under mild conditions, is also provided.

The invention discloses a method for preparing 7-amino-3-sulfotetrazolthiomethylcephalosporanic acid, which comprises: adding solution of boron trifluoride and dimethyl carbonate in a dimethyl carbonate solvent, stirring the solution, adding 7-aminocephalosporanic acid and 5-mercapto-1H-tetrazole-1-methanesulfonic acid disodium salt in turn to perform an reaction; when reactant residue is less than or equal to 0.5 percent, adding purified water to continue the reaction; cooling the reaction solution, filtering the reaction solution, and washing the product obtained by filtration to obtain a coarse crystal product; and dissolving the coarse crystal product, adding an organic solvent, adjusting the pH value, stirring the solution, cooling and standing the solution, filtering the solution, washing the product obtained after filtration and drying the product to obtain the finished product. Compared with the traditional process, the method has the advantages of mild and simple reaction conditions, easy solvent recovery and recycling, reaction yield up to 90 to 91.2 percent, purity up to 98.0 percent and light color as the solution of boron trifluoride and dimethyl carbonate is used as a catalyst. The method is suitable for large-scale production and overcomes the drawbacks of high price, difficult recovery, low yield, low purity and high production cost of the process using solution of boron trifluoride and acetonitrile as a catalyst.

The invention discloses a method for preparing an oxazoline insecticide arfamarin intermediate. The intermediate is 4-formyl-naphthalene-1-carboxylic acid, and compared with a synthesis route of US6613942B1, the synthesis route of the oxazoline insecticide arfamarin is simple. According to the method provided by some embodiments of the invention, through exploration, the reaction steps are shortened from three steps to one step, so the oxazoline insecticide arforlaana intermediate product with qualified purity can be obtained. The intermediate control steps are simplified, meanwhile, the product yield is increased, and industrial production is easier.

The invention discloses a preparation method of tetraethyl methylene diphosphate, comprising the following steps: 1) under the action of sodium ethoxide, diethyl phosphite reacts with sodium ethoxide to obtain sodium diethyl phosphite ethanol solution , ethanol is removed by distillation under reduced pressure to obtain sodium diethyl phosphite solid; 2) dichloromethane is added to the solid sodium diethyl phosphite obtained in step 1); sodium diethyl phosphite and dichloromethane are substituted After the reaction, tetraethyl methylene diphosphate was obtained. The preparation method of the invention has mild and simple reaction conditions and high yield at the same time. The method is simple to operate and low in energy consumption, and is suitable for industrial production.

The invention discloses a method for preparing lithium cobalt oxide nanosheets. The method includes steps of mixing cobalt salt and strong alkali, heating and centrifuging to obtain dark-blue liquid containing cobalt, and performing heat reaction between the dark-blue liquid containing cobalt and lithium brine so as to obtain the lithium cobalt oxide nanosheets with self-support structures. The method is simple and easy to operate and has a potential industrialization prospect. Products prepared by the method are high in charge and discharge capacity.

The invention relates to a synthesis method for a polybrominated benzene [1.3] oxazine derivative, comprising the following steps of: carrying out reaction of compounds shown in formula (I) and N-bromo-succinimide (NBS) in a solvent at 25-100 DEG C to obtain the polybrominated benzene [1.3] oxazine derivative shown in formula (II) after the reaction is completed. The compounds shown in the formula(I) and the formula (II) are as shown in the description, wherein R is chosen from phenyl, substituted phenyl, C1-C5 alkyl (preferably isopropyl) or thiophene. The synthesis method has the advantagesof being mild in reaction conditions, environment-friendly, simple in operation and capable to obtain polybrominated benzene oxazine compounds which cannot be obtained by conventional methods throughone pot multi-step reaction.

The invention relates to a biological enzyme catalysis synthesis method for 6-bromoindanone, and belongs to the field of biological pharmacy. Transpeptidase site-specific mutagenesis type transpeptidase with a SEQ ID NO.2 amino acid sequence has an amino acid sequence disclosed by SEQ ID NO.1, then, propionic acid is added into methyl alcohol to be stirred and fully dissolved, monopotassium phosphate buffer solution of which the pH is 2.0 and 0.95KU site-specific mutagenesis type transpeptidase are added and are stirred for 20h at a room temperature, and after solvent is dried by distillation,filtering is carried out to obtain a crude product; and then, through methyl alcohol/ water recrystallization, a 6-bromoindanone competitive product is obtained. An active transpeptidase enzyme prepared by an enzymatic mutation technology is adopted to replace a traditional chemical synthesis process. A reaction condition is moderate and simple, and extremely few three wastes are generated. Compared with a traditional chemical synthesis method, the biological enzyme catalysis synthesis method has higher synthesis efficiency, high yield and high purity.

The invention relates to a preparation method of a p-amino substituted phenol compound. The preparation method comprises the following steps: sequentially adding a catalyst Ag2O, a reactant I, a reactant II and water into a reactor, and putting the reactor into an ice bath to react for 0.5-10 hours; and extracting the reaction solution with an organic solvent, carrying out reduced pressure distillation on the organic phase to obtain a crude product, and carrying out column chromatography separation and purification to obtain the p-amino substituted phenol compound. Reaction conditions and rawmaterials are cheap and easy to obtain and are carried out in a green solvent water phase, the reaction time is short, the reaction conditions are simple and mild, the regioselectivity is good, and the product has important application value in organic synthesis.

The invention provides a preparation method of cinnamaldehyde diethylacetal. The preparation method comprises the following steps: using 2-bromo-1, 1-diethoxy ethane and benzaldehyde as raw material; and, synthesizing cinnamaldehyde diethylacetal through microwave radiation by taking triphenylphosphine as catalyst and solid carrier, wherein the solid carrier is alkaline macroporous resin. According to the preparation method, raw materials are cheap and easy to obtain, solid catalyst can be removed easily, the reaction condition is soft and simple, side reaction is less, the post-treatment is easy, the product yield and purity is high, the cost is greatly reduced, and the continuous production can be carried out.

The invention discloses a trifluoromethanesulfonyl alkyne amide compound as well as a preparation method and application thereof. Based on hydrosulfide reaction of the alkyne amide and sulfydryl, selective modification and marking of sulfydryl in polypeptide and protein are realized. The compound has good stability. Reaction with sulfydryl only can be selected, and other active groups on the polypeptide or protein are not affected; the method has the advantages of high reaction rate, no side reaction, simple and mild reaction conditions, easiness in operation, wide substrate applicability, high atom economy and the like. The compound has good stability under acid-base and oxidation conditions, can stably exist for several months at normal temperature, and provides a new steady way for selective modification and marking of sulfydryl in biological coupling, polypeptide and/or protein.

The invention discloses a method for directly preparing N,N-bislactose-1,10-decamethylene diamine by adopting one-pot reaction, belonging to the technical field of synthesis of glycosyl surfactants. The method comprises the steps of: mixing lactose with decamethylene diamine in a molar ratio of (2.0-2.5):1, adding an alcohol and water mixed solvent with a volume ratio of alcohol to water being (50-75):100, wherein the ratio of the total mass of the lactose and the decamethylene diamine to the mass of the mixed solvent is 1:(4-6); and mechanically stirring for 20-24h at a normal temperature, heating to 45-60 DEG C in a water bath, reacting for 1-2h, cooling and placing for 0.5-2h, separating out a large quantity of solids, filtering, washing, re-crystallizing with absolute ethyl alcohol, freezing and drying to obtain a white solid, i.e. N,N-bislactose-1,10-decamethylene diamine. The method has the advantages of low price and easy obtaining of raw materials, simple and mild reaction conditions, convenience and safety in operation, simpleness in post-treatment, high production yield, suitability for industrial production, and high implementation value.

The invention relates to a preparation method of tetrasodium glutamate diacetate, belonging to the technical field of organic synthesis. The preparation method comprises the following steps: with sodium glutamate, glyoxylic acid and formic acid as raw materials, subjecting glyoxylic acid and sodium glutamate to a sufficient reactionat a certain temperature, and then generating an aqueous tetrasodium glutamate diacetate solution under the action of formic acid. According to the invention, sodium glutamate, glyoxylic acid and formic acid used in the method are easily available raw materials, byproducts are mainly water and carbon dioxide, highly toxic substances such as cyanide and the like are abandoned, and generation of a large amount of wastewater and toxic byproducts are avoided; usageof chloroacetic acid as a raw material is also discarded, so the influence of chloride ions in the product on some use scenes is prevented; and the method is green, economical, environment-friendly and easy for large-scale industrial production.