90 results about "Carbamoyl chloride" patented technology

The invention relates to a method for continuously preparing toluene diisocynate, in particular to a method for preparing coarse toluene diisocynate by a phosgene method. The method comprises the following steps: mixing toluene diamine and DEIP solvent, performing low-temperature photochemical reaction on the mixture and excessive liquid phosgene in a jet reactor, heating and cracking a reaction product in a photochemical reaction tower to further decompose toluene dicarbamic chloride serving as an intermediate product to form the toluene diisocynate, recycling the reclaimed phosgene and the DEIP solvent, and delivering the hydrogen chloride gas serving as a side product to a hydrogen chloride absorption system.

The invention relates to a preparation of 4-[5-(pyridine-4-yl)-1H-[1,2,4]triazole-3-yl]pyridine-2-formonitrile. The method includes following steps: preparing a compound methyl 2-cyanoisonicotinate represented as the formula (4) with a compound methylisonicotinic-N-oxide (5) being a starting raw material in the presence of a copper catalyst (CuX), a metal cyanide and dimethylcarbamyl chloride; performing hydrazinolysis to the methyl 2-cyanoisonicotinate to obtain a compound 2-cyanoisoniazide represented as the formula (3); and finally performing condensation with a compound 4-cyanopyridine represented as the formula (2) to obtain a compound topiroxostat represented as the formula (1). The method only comprises three steps and is simple in operation and post-treatment. By means of the copper catalyst, a usage amount of the metal cyanide is greatly reduced so that reaction conditions are milder. The method is high in purity of the prepared product and is suitable for industrial production.

The invention relates to a preparation method of topiroxostat, which comprises the following steps: reacting an initial raw material compound isoniazide disclosed as Formula (6) with a compound 4-cyano-pyridyl-N-oxide disclosed as Formula (5) to generate a triazole compound disclosed as Formula (4), reacting the triazole compound disclosed as Formula (4) in the presence of a copper catalyst (CuX), zinc cyanide (Zn(CN)2) and dimethylamino formyl chloride to generate a cyanotriazole compound disclosed as Formula (3), reacting the compound disclosed as Formula (3) in the presence of p-toluenesulfonic acid to generate a compound disclosed as Formula (2), and finally, alkalifying with inorganic alkali to obtain the target compound disclosed as Formula (1) (topiroxostat). The method is simple in operation and after-treatment, and greatly lowers the consumption of the zinc cyanide due to the use of the copper catalyst, so that the reaction conditions are milder, and the purity of the prepared product is high; and the method is suitable for industrial production.

The present invention is asymmetrical (S)-carbalatine synthesizing process including the following steps: protecting the phenolic hydroxyl group of m-hydroxy benzaldehyde, reacting with chiral tert-butyl sulfonamide to produce (R, E)-3-methoxyl-phenyl methylene tert-butyl sulfonamide, addition reacting with methyl Grignard reagent, hydrolyzing, Eschweiler-Clarke methylation reaction, demethylating BBr3 to synthesize important intermediate (S)-1-(3-hydroxy phenyl)-N, N-dimethyl ethyl amine, and esterification with methyl ethyl carbamyl chloride to obtain (S)-carbalatine. The present invention has less reaction steps, high yield, total yield up to 21.85 %, and low cost.

The invention relates to a process for the preparation of the trans N-{4-{2-[4-(2,3-dichlorophenyl)-piperazine-1-yl]-ethyl}-cyclohexyl}-carbamide derivatives of general formula (I) by reacting the compound of formula (III) with a carbamoylchloride of general formula (II) which comprises carrying out the reaction in a mixture of a solvent and concentrated aqueous solution of an alkali hydroxide at a temperature between 40-100° C. in the presence of a phase transfer catalyst, separating the phases and washing the organic layer then removing the solvent and drying the compound of formula (I) obtained until its weight is constant.

The invention discloses a propargyl urea monomer in the macromolecular material domain, which is characterized by the following: group R1 and R2 in the structure formula (1) of propargyl urea monomer are the same or different, which are aromatic radical or alkyl; the number average molecular weight of structure formula (2) of propargyl urea monomer is 6800-136600 and the molecular weight distribution index is 1.34-2.91 with 100 percent sym-form structure. The making method comprises the following steps: adding secondary amine drip at 3:1 rate in the organic solution of solid phosgene; heating to reflux for 10-30h; cooling; removing organic solvent through boiling to produce carbamyl chloride; reacting carbamyl chloride and propargyl amine at 1:1 rate for 2-5 h; neutralizing through alkali after acid cleaning; dewater; boiling out carrene to produce propargyl urea monomer; solving propargyl urea monomer and transition metal accelerant at 50:1-100:1 rate in the organic solvent protected by nitrogen; blending two solutions to polymerize for 2-24 h at -15-30 deg.c; adding skellysolve B; settling; filtering; drying in the vacuum. The invention can produce polymerization with more ideal molecular weight and molecular weight distribution, which can be used in optical, biological and medicine domain.

The invention relates to a method for synthesizing tebuthiuron technical. The method adopts methylaminoformyl chloride and 5-tert-butyl-2-methylamino-1,3,4 thiadiazole to directly react to generate the tebuthiuron with the reaction formula as the above. The new method avoids using inflammable and explosive dangerous chemical methyl isocyanate with great toxicity, and is safer for production. The method reduces the requirement on equipment materials, and reduces equipment investment.

The invention discloses a production method of methyl isocyanate. The method comprises the following steps: producing CO from CO2, O2 and coke, producing phosgene from CO and chlorine gas, synthesizing methylaminoformyl chloride from the phosgene and the monomethylamine, decomposing and purifying to prepare the methyl isocyanate. The invention further discloses production equipment of methyl isocyanate. According to the production method and equipment, the energy consumption can be effectively reduced, byproducts are reduced, the production cost is lowered, the product yield is increased, the labor intensity of workers is reduced, the production field environment is improved, the reaction safety is further enhanced, and the three-waste emission is reduced.

The invention discloses functional organosiloxane containing asymmetrical substituted urea and a preparation method thereof. The preparation method comprises the following steps: carrying out reaction between 4, 4'-dibromodiphenylamine and triphosgene to obtain (i) N, N(/i)-di(4-bromo phenyl) carbamyl chloride; and then, carrying out reaction with 3-aminopropyl triethoxysilane to obtain functional organosiloxane, wherein the organosiloxane is the functional organosiloxane containing asymmetrical substituted urea through the verification of infrared spectrum, ultraviolet spectrum, 1H-NMR (1Hydrogen-Nuclear Magnetic Resonance) and 13C-NMR. The structure of the compound contains a plurality of functional groups such as siloxane, amide, urea groups and bromoaryl. The functional organosiloxane has a potential application value on the respects of molecular imprinting recognition materials, structural flame retardant materials, rare earth light emitting materials, white carbon black and the like. The functional organosiloxane disclosed by the invention is reasonable in synthetic line, mild in condition, easy to operate, low in cost of raw materials and high in product yield.

The invention discloses a method for synthesizing a tebuthiuron technical material. The method comprises the following steps: taking 5-tert-butyl-2-methylamino-1,3,4-thiadiazole as a starting material; carrying out salt forming reaction and photochemical reaction in an organic solvent to prepare N-methyl-N-(5-tert-butyl-1,3,4-thiadiazole) carbamyl chloride; and introducing monomethylamine gas into the N-methyl-N-(5-tert-butyl-1,3,4-thiadiazole) carbamyl chloride to generate the tebuthiuron. The method has the advantages of simplicity in process, low production cost, high product purity, high yield, high production safety and the like.

The invention discloses a synthesizing method of (S)-N-ethyl-3-[(1-dimethylamino) acetyl]-N-methyl amido phenyl formate, which is characterized by the following: adopting m-hydroxy acetophenone as raw material; synthesizing intermediate 3-(1-(dimethylamino) ethyl) phenol; condensing 3-(1-(dimethylamino) ethyl) phenol and formyl chloride to produce the product with high receiving rate.

The invention relates to a preparation method of rivastigmine tartrate and intermediates thereof, which comprises the steps of carrying out reductive amination on 3-benzyloxy acetophenone and dimethyl for obtaining a (1-(3-benzyloxy-phenyl)-ethyl)-dimethylamine (II) compound, removing benzyl with hydrogenated amine, obtaining 3-(1-(dimethylamino) ethyl) phenol (V), further carrying out condensation reaction with N-methyl-N-ethyl carbamoyl chloride, resolving a rivastigmine racemate with D-(+)-p-methyl dibenzoyl tartaric acid, and further salifying with L-(+)-tartaric acid for obtaining the rivastigmine tartrate (I). The method has the advantages of cheap price and easy obtainment of raw materials, short synthetic route, few reaction steps, mild reaction conditions and easy separation and purification of all the intermediates, thereby being applicable to industrial production.

The invention discloses a preparation method of dimethylcarbamoyl chloride. The preparation method comprises the following steps: simultaneously introducing dimethylamine and phosgene into a micro-reactor to perform the reaction to obtain the dimethylcarbamoyl chloride. The dimethylcarbamoyl chloride prepared in the preparation method disclosed by the invention is high in content, the content reaches 98.5 to 99 percent, and the yield is greatly increased and can reach 95.0 to 96.2 percent (referring to dimethylamine). The preparation method disclosed by the invention has the advantages of simple operation, high yield, less waste, safety, environmental protection and the like, is suitable for industrialized production and good in application value and application prospect.

The invention belongs to the field of toluene diisocynate production technology and relates to a dehydration method during the production process of toluene diisocynate. Toluenediamine and phosgene have cold light gasification reaction to obtain a mixture flow of carbamyl chloride, amidogen hydrochloride and hydrogen chloride; the mixture flow flows into a phosgenation reaction tower; carbamyl chloride and amidogen hydrochloride react to produce toluene diisocynate and the by-product hydrogen chloride; at the bottom of a hydrogen chloride rectifying tower, the mixture flow of amidogen and hydrogen chloride is divided into two parts, most of the mixture flow returns to the top of the phosgenation reaction tower and serves as the backflow, and the rest of the mixture flow enters into a drain sump containing activated carbon as the catalyst; water and phosgene in the mixture flow react to produce hydrogen chloride and carbon dioxide to remove water in the mixture flow under the function of the activated carbon catalyst; the dehydrated mixture flow enters into the bottom of the phosgenation reaction tower for further rectification and is discharged from the bottom of the phosgenation reaction tower for next step. The dehydration technology is simple and environmentally friendly, the cost is low, and the dehydration effect is excellent.

The present invention relates to synthesis process of N-chloromethyl-N-phenyl amino formyl chloride. The technological process includes the chloroformylating reaction of N-methyl aniline and phosgene in solvent to obtain N-methyl-N-phenyl amino formyl chloride, and the subsequent chlorination reaction of the resultant solution directly or after eliminating solvent with introduced chlorine at 60-130 deg.c under the action of catalyst or ultraviolet ray to obtain the product. Or, N-chloromethyl-N-phenyl amino formyl chloride is prepared with N-methyl-N-phenyl formamide as the initial material and through chlorination reaction with introduced chlorine at 60-130 deg.c under the action of catalyst or ultraviolet ray to obtain the product. The present invention realizes no solvent synthesis, and has high conversion rate and high product yield.

The invention provides an improved method for preparing pimavanserin and tartrate thereof. The method comprises the following steps: taking a compound 4-(4-fluorobenzylamino)-1-methylpiperidine as a starting material and carrying out acylation reaction on the starting material and triphosgene in the presence of triethylamine to prepare a compound (4-fluorobenzyl)-(1-methylpiperidine-4-yl)carbamyl chloride; then taking the (4-fluorobenzyl)-(1-methylpiperidine-4-yl)carbamyl chloride and 4-isobutoxybenzylamine to react in the presence of triethylamine, so as to prepare the pimavanserin and the tartrate thereof. The method provided by the invention is simple, efficient and economical and the quality of an intermediate is controllable, so that the method is suitable for industrial preparation.

The invention discloses a preparation method of pirimicarb. The method is used for preparing the pirimicarb by reaction in which 5,6-dimentyl-2-dimethylamino-4-hydroxypyrimidine and dimethylamino carbamyl chloride are taken as raw materials, sodium hydroxide is taken as an acid-binding agent, an inert solvent, namely toluene or dimethylbenzene, is taken as a reaction solvent, and 4-dimethylamino pyridine is taken as a catalyst. The reaction formula is shown in the description, the pirimicarb content is as high as 98.1% to 99.2%, the reaction yield is as high as 98.1%-99.4% metered by 5,6-dimentyl-3-dimethylamino-4-hydroxypyrimidine, the reaction time is as short as 1h-3h, the acid-binding agent is unnecessary to recycle, the operation and subsequent processing are simple, and the production cost is low.

The invention discloses a method and a device for continuous preparation of carbamyl chloride. The method includes: diluting an amino compound by an inert gas and preheating it, letting the amino compound continuously enter a ceramic membrane microporous gas distributor at one end inside a tubular reactor and diffuse into the tubular reactor through pores on membrane tube walls of the ceramic membrane microporous gas distributor; preheating inert gas diluted phosgene, and making it continuously enter the tubular reactor through a phosgene inlet at the above end inside the tubular reactor along the membrane tube wall tangential direction of the gas distributor and mix with the diffused amino compound to undergo a reaction, and then carrying out separation so as to obtain carbamyl chloride. The device mainly comprises the tubular reactor and the membrane distributor. The method can effectively improve the yield of the isocyanate intermediate carbamyl chloride, is simple and has rapid reaction, thus being able to realize continuous industrial production. The device disclosed in the invention can well disperse the reaction raw materials and achieve a good mixing effect, thus being beneficial to improve the reaction yield and product quality and reducing side reaction in the reaction process.

The invention provides a treatment system of residues in a methyl isocyanate synthetic process. The treatment system comprises a residue isolation tank, a blending groove and a residue steaming tank, wherein the residue isolation tank is used for collecting a residue material generated after decomposition of methylaminoformyl chloride in the methyl isocyanate synthetic process, standing and layering to obtain a liquid-phase material on the upper layer and a sediment material on the lower layer; the blending groove is connected with the top of the residue isolation tank and is used for collecting the liquid-phase material on the upper layer for cyclic utilization; the residue steaming tank is connected with the bottom of the residue isolation tank, and is used for collecting the sediment material on the lower layer as well as steaming and filtering the sediment material to separate the residues. The invention further provides a treatment method of the residues in the methyl isocyanate synthetic process. According to the system and the method, the generated residues can be separated effectively, and the liquid-phase material can be continuously and cyclically utilized, so that the problem that the residues in the methyl isocyanate synthetic process are difficult to effectively clear in time, and the production efficiency is improved.

The invention discloses a production process of rivastigmine. The production process comprises the steps as follows: 1), m-hydroxyacetophenone and dimethylamine are taken as raw materials, and 3-(1-(dimethylamino) ethyl) phenol is synthesized through one-step Leucart reaction; and 2), 3-(1-(dimethylamino) ethyl) phenol and ethylmethyl-carbamic chloride result in condensation reaction to produce rivastigmine. With the adoption of the production process, the production yield and the purity of rivastigmine can be improved remarkably, the process steps are reduced, and the production cost is reduced.

The invention relates to an application method of a methylamino formyl chloride decomposition tail gas hydrogen chloride in cartap synthesis. After a tail gas mixture of hydrogen chloride, trichloromethane and methyl isocyanate produced by decomposing methylamino formyl chloride is condensed by a condenser, the condensed condensate is transferred into a methylamino formyl chloride mixing slot, and then enters a circulating system of methyl isocyanate production for being collected and recycled; uncondensed gas hydrogen chloride is directly added into thiocyanide liquor of cartap synthesis after pressure is stabilized by a secondary buffer tank, so that the cartap is synthesized by catalytic hydrolysis. According to the invention, tertiary step cooling and condensing is adopted to separate a hydrogen chloride gas in the tail gas from a trichloromethane gas and a methyl isocyanate gas. The whole separating and recycling process is less in equipment investment and less in amount of byproduct hydrochloric acid; moreover, the separated hydrogen chloride gas is used for a catalytic hydrolysis process of the cartap.