69 results about "Phenylcarbamic acid" patented technology

The invention aims to provide pyraclostrobin and a method for economically synthesizing the same. High purity pyraclostrobin can be synthesized at low cost. The method comprises the following steps of: adding N-hydroxy-N-2-[(N-parachlorobenzyl)-3-pyrazoloxymethyl]phenyl carbamate and an acid bonding agent into a polar solvent or non-polar solvent, uniformly mixing, adding dimethyl sulfate, and reacting at the temperature of between 20 and 30DEG C; and after the reaction is monitored to be finished through high performance liquid chromatography (HPLC), adding water to neutralize until the pH=7, removing the solvent, immersing in a recrystallization solvent, performing recrystallization, and removing a recrystallization solution to obtain the pyraclostrobin, wherein a molar ratio of the N-hydroxy-N-2-[(N-parachlorobenzyl)-3-pyrazoloxymethyl]phenyl carbamate to the acid bonding agent to the dimethyl sulfate is 1:(1-1.8):(1-1.8). By the invention, the energy consumption is low, the utilization rate of materials is high, the operation is simple, and the yield and purity of the product are high; and compared with the traditional method, the method is more energy-saving, environment-friendly and economic, and has great industrial application value.

Provided are a process for the preparation of phenyl carbamate derivatives, useful in the treatment of CNS (central nervous system) disorders, an intermediate in the synthesis of the phenyl carbamate derivatives, and a process for preparation of the intermediate.

The invention provides a novel chitosan carbanilate-carbamido derivative synthetic method, the method employs chitosan and phenyl isocyanate with different groups to react, and then the hydroxy and amino on chitosan can be completely conversed to the chitosan carbanilate-carbamido derivative of carbamate and carbamido. According to the invention, a coating process is employed to prepare the derivative to a chiral stationary phase, and high performance liquid chromatography is used for resolution of various enantiomers, and the chiral stationary phase has high chiral identification capability.

The invention provides a preparation method of an immobilized beta-cyclodextrin derivative type chiral stationary phase. The preparation method comprises the following steps: reacting isocyanate propyl triethoxy silane with beta-cyclodextrin; performing derivatization modification on a hydroxyl group on a beta-cyclodextrin glucose unit by using phenyl isocyanate to obtain a beta-cyclodextrin derivative; coating the beta-cyclodextrin derivative bonded with a small amount of silane coupling agent on the surface of aminopropyl silica gel, and performing condensation in ethanol/aqueous solution in the presence of trimethylchlorosilane by using the silane coupling agent in the beta-cyclodextrin derivative molecules to finally obtain the immobilized beta-cyclodextrin derivative type chiral stationary phase, wherein the phenylcarbamate beta-cyclodextrin derivative molecules are connected by using a silicon-oxygen-silicon bond to form an inclusion netlike structure which covers the surface of the aminopropyl silica gel. The preparation method has the characteristics of simplicity, few steps and high bonding efficiency, can be applied to the normal-phase high-performance liquid chromatographic condition, and has the advantages of high chromatographic column stability and high chiral separation capacity.

The present invention provides prodrugs of analogs of the anti-tumor antibiotic CC-1065 having a cleavable protective group containing a sulfonic acid containing phenyl carbamate, in which the protecting group confers enhanced water solubility upon the prodrug, and in which the prodrug also has a moiety, such as a sulfide or a disulfide, that can conjugate to a cell binding reagent such as an antibody, and for the therapeutic use of such prodrug and conjugates, and for processes for preparing such prodrugs and conjugates.

The invention discloses a method for catalytically synthesizing pyraclostrobin, relating to the technical fields of chemical industry and pesticide intermediate preparation. The method comprises the following steps: adding a compound II N-hydroxy-N-2-[(N-p-chlorphenyl)-3-pyrazolyloxymethyl]carbanilate into a two-phase solvent, adding a phase-transfer catalyst, and meanwhile, dropwisely adding an acid-binding agent water solution and dimethyl sulfate to carry out etherification reaction on the compound II N-hydroxy-N-2-[(N-p-chlorphenyl)-3-pyrazolyloxymethyl]carbanilate and dimethyl sulfate while keeping the pH value of the reaction system at 8-9, thereby obtaining the compound I pyraclostrobin. The method has the advantages of short reaction time and high product yield, lowers the production cost, and reduces the generated wastewater, thereby being beneficial to environment protection.

Compounds of the formula 1:

including a stereoisomer thereof, or an N-oxide, a pharmaceutically acceptable addition salt, or a pharmaceutically acceptable addition solvate thereof; useful as HCV inhibitors; processes for preparing these compounds as well as pharmaceutical compositions comprising these compounds as active ingredient.

The invention provides a synthesis process of pyraclostrobin, which can be divided into five steps: (1) o-nitrotoluene and NH ₄ Cl reduction reaction occurs under the catalysis of zinc powder and alloy micronano powder; (2) acylation reaction of hydroxylamine; (3) methylation reaction; (4) N-methoxy-N -2-bromomethylphenyl methyl carbamate; (5) use DMF as a solvent to dissolve N-methoxy-N-2-bromomethyl phenyl methyl carbamate and make a solution for subsequent use, and 1-( 4‑chlorophenyl)‑pyrazolol, K ₂ CO ₃ , acetone and put them into the reactor together, after heating up and refluxing, slowly add N-methoxy-N-2-bromomethylphenyl carbamate solution in the reactor, and the product pyrazole ether is obtained after the reflux reaction is completed Strostrobin. Compared with the prior art, the preparation method of the present invention is simple, the raw materials are cheap and easy to obtain, the reaction conditions are mild, and the purity and yield of the obtained target product are high.

The invention provides a technology for synthesizing pyraclostrobin by a six-step method. The synthesis technology comprises the following steps: 1) performing a reduction reaction of ortho-nitrotoluene; 2) performing an acylation reaction of hydroxylamine; 3) performing a methylation reaction; 4) obtaining N-methoxyl-N-2-bromomethyl phenyl methyl carbamate through a bromination reaction; and 5) performing synthesis of 1-(4-chlorophenyl)pyrazolidine-3-ketone; and 6) performing synthesis of pyraclostrobin. Compared with the prior art, the preparation method has the advantages of simple process, easily available raw materials with low cost, and mild reaction condition, and the purity and yield of the target products are high.

The invention provides a preparation method of a tedizolid phosphate intermediate compound 3-fluoro-4-(6-(2-methyltetrazole-5-yl)pyridine-3-yl)phenyl benzyl carbamate. The method comprises the following steps: carrying out a reaction on 5-bromo-2-(2-methyltetrazole-5-yl)pyridine as a raw material and triisopropyl borate under the action of n-butyllithium to prepare a boric acid intermediate, coupling the boric acid intermediate and 1,2-difluoro-4-nitrobenzene, and finally performing nitro reduction and amidation to obtain the required target product. Compared with the method in the prior art,the preparation method disclosed by the invention has the advantages of easily available raw materials, simple process, economy, environmental protection and suitability for industrial production.

The invention discloses a method for simply synthesizing pyraclostrobin. The method comprises steps as follows: N-hydroxyl-N-2-[1-(4-chlorophenyl)-3-pyrazoloxy methyl]phenyl carbamate and a phase transfer catalyst are dissolved in an organic solvent, dimethyl sulfate is added, an acid-binding agent is dropwise added at the system temperature kept in a range of 5-70 DEG C, the components react for 1-5 h, and pyraclostrobin is obtained. Under the condition of reasonable control of feeding sequence of reaction raw materials and the system temperature, the problems of many reaction by-products as well as potential safety hazard and the like due to the many reaction by-products in an existing pyraclostrobin synthesis process are effectively solved, and a plurality of advantages such as reduction of production cost, reduction of wastewater quantity in a production process and the like can be provided for industrial production, so that the method is beneficial to energy conservation, emission reduction and environment protection of pesticide chemical enterprises and is more suitable for large-scale industrial production.

The present invention relates to a composition for preventing or treating a memory loss related disease comprising a phenyl carbamate compound and a method for preventing or treating various diseases related to loss of memory therewith. The present invention ensures the enhancement of neuroprotection, such that it is promising for preventing or treating memory loss-related diseases such as dementia and Alzheimer's disease.

The present invention relates to a composition for neuroprotection comprising a phenyl carbamate compound and a method for providing neuroprotection therewith. The present invention ensures the enhancement of neuroprotection, such that it is promising for preventing or treating various diseases associated with neurological injury.

The invention discloses an acetylene-terminated ethylene oxide tetrahydrofuran copolyether containing carbamic acid ester units. The structural formula is shown in the picture I. A synthesis process includes the steps that 1, propargyl alcohol reacts with an excessive amount of toluene-2,4-diisocyanate, and then propargyl (3-isocyanate group-4-methyl) phenyl carbamate is obtained; 2, propargyl (3-isocyanate group-4-methyl) phenyl carbamate and terminal hydroxyl ethylene oxide tetrahydrofuran copolyether generate the acetylene-terminated ethylene oxide tetrahydrofuran copolyether containing the carbamic acid ester units through an additive reaction. The acetylene-terminated ethylene oxide tetrahydrofuran copolyether containing the carbamic acid ester units has a specific chain structure, is free of side reactions, and is applied to a polytriazole elastomer so that the polytriazole elastomer can have excellent mechanical properties.

The invention discloses a synthesis method of alkynyl-terminated polybutadiene containing a carbamate element. The structural formula of alkynyl-terminated polybutadiene is shown in formula I. The synthesis process of alkynyl-terminated polybutadiene comprises steps as follows: (1) propynol and excessive toluene-2,4-diisocyanate react to produce propargyl(3-isocyanate-4-methyl)phenyl carbamate; (2) propargyl(3-isocyanate-4-methyl)phenyl carbamate and hydroxyl-terminated polybutadiene are subjected to an addition reaction to produce alkynyl-terminated polybutadiene containing the carbamate element. The synthesized alkynyl-terminated polybutadiene containing the carbamate element adopts a specific chain structure, has no side reaction and enables polytriazole elastomers to have excellent mechanical performance when applied to the polytriazole elastomers.

The application relates to 2-amino-4-(substituted amino)phenyl carbamate derivatives, or pharmaceutically acceptable salts or solvates thereof, as KCNQ2/3 potassium channel modulators, and methods of their uses.

The invention provides regioselective synthesis and application methods for amylose derivatives with different carbamate side groups. The synthesis method comprises taking amylose as an initial raw material, firstly introducing a tert-butyldimethylsilyl ester at 2- and 6- positions of a sugar unit of amylase as a protective group, then introducing a phenylcarbamic acid ester group at 3- position of the sugar unit, then in an alkali solution, removing the protective group and reducing hydroxyl at 2- and 6- positions, and finally introducing another kind phenylcarbamic acid ester group at 2- and 6- positions at the same time so as to finally realize regioselective synthesis of the amylose derivatives. On the basis, the synthesized novel amylose derivative is fully dissolved, the surface of silica gel is uniformly coated with the polymer through a coating process, and a column is packed by employing a homogenating process, so that a novel amylose chiral stationary phase is prepared. high performance liquid chromatography is applicable to detailed evaluation on the chiral recognition performance of the prepared chiral stationary phase.