136 results about "Azilsartan" patented technology

The invention relates to the technical field of azilsartan intermediate preparation method. According to the invention, a compound 1-[(2'-cyanobiphenyl-4-group)methyl]-2-ethoxy benzimidazole-7-methyl carboxylate is subject to a reaction with an aqueous solution of hydroxylamine, such that the intermediate is prepared. In prior arts, amide impurities with an amount equal to that of the products are generated. With the method provided by the invention, the impurities are greatly reduced, such that the yield is increased. In prior arts, the reaction time is 48 hours, and yet a small amount of raw materials is not reacted. With the method provided by the invention, the reaction time is 24 hours, and the reaction is sufficiently carried out, such that the efficiency is improved. In a post-processing process, complicated steps of acid extraction and alkali ionization are not required. When the reaction id finished, the materials are cooled, and the target product can be precipitated directly.

The invention discloses azilsartan tablets and a preparation process thereof. The tablets comprise azilsartan, microcrystalline cellulose KG1000 and other pharmaceutically acceptable auxiliary materials and are prepared by pressing by adopting a dry-process direct tabletting process. According to the preparation, the content of azilsartan is uniform, and drugs are rapidly dissolved out within 5 minutes. In addition, the preparation process of the preparation is simple, raw materials are not needed to be specially crushed, the granularity requirement is not strict, complex preparation equipment is not needed, and large-scale industrial production is easily realized.

The invention discloses a preparation method of an azilsartan intermediate shown as in the formula I. According to the invention, the intermediate shown as in the formula I is obtained through a condensation cyclization reaction between a compound shown in the formula II and N, N'-carbonyl diimidazole or bis (trichloromethyl) carbonate in an aprotic solvent. Organic alkali can be added in the above reaction system to improve the reaction rate. The preparation method of the azilsartan intermediate shown as in the formula I has the advantages of high yield and low cost.

The invention belongs to the technical field of medicines, and particularly relates to an azilsartan tablet. The azilsartan tablet contains azilsartan, hydroxy propyl cellulose and fumed silica, and is prepared by the following steps: dissolving the azilsartan and the hydroxy propyl cellulose in diethylene glycol monoethyl ether, adding the fumed silica to adsorb, uniformly mixing with pharmaceutically acceptable auxiliary materials and pressing by a direct tableting process. Compared with the prior art, the azilsartan tablet is high in drug dissolution speed and simple in process.

The invention discloses a preparation method of an intermediate 5B and azilsartan 1. The preparation method of the azilsartan 1 comprises the following steps: 1) in a solvent, mixing a compound 2B with hydroxylamine to react to obtain a compound 3B; 2) in a solvent, mixing the compound 3B prepared in the step 1) with chloroformate to react under the action of alkali to obtain a compound 4B; 3) in a solvent, carrying out cyclization reaction on the compound 4B prepared in the step 2) to obtain a compound 5B; and 4) in a solvent, carrying out esterolysis reaction on the compound 5B prepared in the step 3) under the action of alkali to obtain the azilsartan 1, wherein R is a C6-C10 aryl group or C1-C4 straight-chain or branched-chain alkyl group. The preparation method of the azilsartan intermediate 5B is described as the step 3). The preparation method has the advantages of fewer impurities, short reaction time, higher technical yield and higher product purity, and is suitable for industrial production.

The invention discloses a preparation method of Azilsartan tablets and belongs to the technical field of medicine. The preparation method comprises the following steps: 1, micronizing the Azilsartan, controlling D90 less than 15 micrometers, and conducting weighing according to formula dosage; 2, screening lactose monohydrate with a 60-mesh screen, and conducting weighing according to formula dosage; 3, screening a disintegrating agent and diluent with a 60-mesh screen respectively, and conducting weighing according to formula dosage; 4, mixing the auxiliary ingredients in the step 1, 2 and 3, adding solubilizer, conducting mixing, and screen the mixture with a 60-mesh screen; mixing the auxiliary ingredients uniformly, and adding adhesion agents for soft materials; conducting sieving, granulating, drying and arranging, adding lubricating agents, mixing the mixture uniformly, and tabletting. According to the preparation method, by controlling the particle diameter of the Azilsartan and the weight ratio between the Azilsartan and the lactose monohydrate and the varieties and adjusting the proportion of the disintegrating agents, the lubricating agents, the diluent, the solubilizer and the binding agents, the problem of dissolution rate can be solved, and the problem of external consistent dissolution is solved as well.

The invention relates to an azilsartan solid dispersion as well as a preparation method and a medicament composition thereof. The preparation method of the azilsartan solid dispersion comprises the following steps: adding water into an azilsartan raw material and a surfactant, and grinding to obtain a suspension; and drying the suspension, and then crushing to obtain the azilsartan solid dispersion. The preparation method can increase the permeability and dissolution property of the azilsartan raw material to ensure that the solubility and dissolution rate of the azilsartan raw material are obviously increased, thereby improving the bioavailability of the azilsartan raw material; and moreover, the water replaces an organic solvent to ensure that the safety of the preparation process and the product is high. The solid dispersion obtained by the preparation method provided by the invention is high in solubility, and the medicament composition containing the solid dispersion is high in dissolution rate and good in stability.

The invention discloses an azilsartan intermediate and a preparation method thereof. The preparation method comprises the following step: in a solvent, mixing a compound 3B with chloroformate to react under the action of alkali to obtain a compound 4B. The preparation method has the advantages of fewer impurities, short reaction time, higher technical yield and higher product purity, and is suitable for industrial production.

The invention discloses an azilsartan intermediate and a preparation method thereof. The preparation method comprises the following step: in a solvent, mixing a compound 2B with hydroxylamine to react to obtain the compound 3B. The preparation method has the advantages of fewer impurities, short reaction time, higher technical yield and higher product purity, and is suitable for industrial production.

The invention relates to an intermediate for preparing azilsartan and a novel preparation method for the azilsartan. The method includes the following steps: 1) reducing 2-cyano-4'-bromomethylbiphenyl with hydroxylamine hydrochloride to generate (Z)-4'-bromomethyl-(N')-hydroxy-[1,1'-biphenyl]-2-amidine; 2) performing esterification with ethyl chloroformate to generate (Z)-4'-bromomethyl-(N')-((ethoxycarbonyl)oxyl)-[1,1'-biphenyl]-2-amidine; 3) performing ring closing to prepare 3-(4'-(bromomethyl)-[1,1'-biphenyl]-2-yl)-1,2,4-oxadiazole-5-(4H)-one; 4) performing a condensation reaction to 2-ethoxy-1H-benzimidazole-7-methyl carboxylate and the 3-(4'-(bromomethyl)-[1,1'-biphenyl]-2-yl)-1,2,4-oxadiazole-5-(4H)-one to prepare 2-ethoxy-1-((2'-(2,5-dihydro-5-oxy-1,2,4-oxadiazole-3-yl)biphenyl-4-yl)methyl)benzimidazole-7-methyl carboxylate; and 5) finally performing hydrolysis to prepare the azilsartan. The method employs the raw material being easy to obtain, is short in synthetic route, is low in device cost, is less in side products, is low in toxicity and pollution, is environment-friendly, is high in product purity and is suitable for industrial production.

The invention relates to a medicinal composition containing azilsartan. The medicinal composition contains azilsartan, hydragogue and pharmaceutically-acceptable auxiliary materials. According to the medicinal composition, the azilsartan has the superiority in a dissolving-out aspect and has an obvious synergistic effect under the condition of combining the azilsartan and the hydragogue, and the dose can be reduced.

The invention belongs to the technical field of pharmaceutic preparations, and particularly relates to an azilsartan tablet and a preparation method thereof. The provided azilsartan tablet comprises the following preparation raw materials in percentages by weight: 14-28% of azilsartan, 25-55% of a diluent (I), 8-26% of a diluent (II), 8-12% of a diluent (III), 1-4% of a stabilizer, 4-8% of a disintegrating agent, 0.4-2% of a lubricating agent and 1-3% of a binding agent. The prepared azilsartan tablet is smooth in appearance, good in hardness, small in tablet weight difference and uniform in content, and in-vitro dissolution behaviors of the azilsartan tablet are consistent to those of original drug. Through acceleration tests for six month, single impurity content is 0.14%, the sum of impurity contents is 0.54%, the quality is excellent, the stability is good, the process is simple, and commercialized production is facilitated.

The invention discloses azilsartan tablets and a preparation method thereof, and belongs to the field of pharmacy. For the azilsartan tablets, each azilsartan tablet is prepared from, by mass, 7.80%-16.30% of azilsartan, 59.78%-70.18% of lactose monohydrate, 15.00%-18.00% of microcrystalline cellulose, 1.15%-1.40% of hydroxypropyl methylcellulose (5cps), 2.20%-2.80% of low-substituted hydroxypropyl cellulose, 2.20%-2.80% of polyethylene glycol 6000 and 0.55%-0.85% of magnesium stearate. By means of a fluidized bed top-spraying granulation method, three processes of mixing, granulation and drying in a traditional technology are completed in one step, the production efficiency is improved, and the prepared granules are uniform in granule size and good in fluidity and compression formability; meanwhile, due to the fact that a disintegrating agent is added internally and externally, the problem that the azilsartan tablets disintegrate and dissolve slowly is solved.

The invention relates to the technical field of an azilsartan intermediate and preparation technology thereof. In the invention, the azilsartan intermediate is 2-ethoxy-1-[[2'-(N'-hydroxylaminomethylimino)biphenyl-4-yl]methyl]-1H-benzimidazole-7-carboxylate (compound of formula VI); and a preparation method thereof comprises the step of reacting between 2-ethoxy-1-[(2'-cyanbiphenyl-4-yl)methyl]-1H-benzimidazole-7-carboxylate and hydroxylamine aqueous solution. The invention provides a new azilsartan intermediate; the preparation method solves the problem of the prior art that a great quantity of impurities such as amide and the like are generated in the preparation of other azilsartan intermediates, and improves the purity and yield of the product; the reaction time is reduced from 24 hours to 8 hours to finish the reaction, thus the production efficiency is improved; and moreover, the after-treatment does not need the complicated production steps of acid extraction, alkali dissociation and the like, and the target product can be directly separated out by cooling and adding water after the reaction.

The invention discloses a treatment method of an azilsartan crude drug. The preparation method comprises the following steps: dissolving azilsartan in a solvent, and extracting azilsartan by applying supercritical fluid in a supercritical state so as to provide particles of the azilsartan crude durg, wherein the D90 grain size is less than 15 micrometers, and the content of single impurities is less than 0.05%. The treatment method disclosed by the invention has the beneficial effects that the treatment method solves the problem that related substances are rapidly increased when conventional crushing methods are adopted to prepare azilsartan particles, and the storage period of the azilsartan preparation is prolonged.

The invention discloses a preparation method of an azilsartan intermediate. The preparation method of the azilsartan intermediate comprises the following steps: dissociating hydroxylamine hydrochloride through alkali in ethanol which is 90-95% in mass percentage, filtering, adding a compound as shown in formula (II) in the specification, triethylamine and ethanol to filtrate, implementing a reflux reaction, cooling and crystallizing after the reaction, and filtering to obtain the target intermediate as shown in formula (I). The target intermediate prepared by the preparation method disclosed by the invention is high in content, and low in content of amide impurities, which is generally less than 10%.

The invention belongs to the field of medicine, and particularly relates to an azilsartan crystal and a preparation method thereof. The crystal is a monoclinic system, the space group is P2(1)/c, and the cell parameters are as follows: a=9.718(2)A, b=11.319(3)A, c=20.074(5)A, alpha=0 degrees, beta=90.383(5) degrees and gamma=90 degrees; the cell volume is 2208.0(8)A<3>; the dihedral angle between the benzimidazole ring and adjacent benzene ring is 68.42 degrees; the dihedral angle between two connected benzene rings is 59.84 degrees; and the dihedral angle between 5-oxo-1,2,4-oxadiazole ring and connected benzene ring is 71.83 degrees. The preparation method comprises the following steps: mixing azilsartan and absolute methanol, dissolving by heating under reflux, and slowly crystallizing in a stable environment at 10-30 DEG C to obtain the azilsartan crystal. The preparation method is simple, has the advantage of single crystal form, and has obvious effect on purifying azilsartan.

The invention provides a method for detecting the content of hydroxylamine hydrochloride in azilsartan. According to the method, hydroxylamine is subjected to derivatization treatment by adopting benzaldehyde, octadecylsilane chemically bonded silica is used as a filler of a chromatographic column, a mobile phase A is a 10mmol/L ammonium formate solution (containing 0.1% of formic acid), a mobilephase B is acetonitrile, gradient elution is adopted, a sample does not need to be specially treated, and matrix influence is avoided. According to the detection method, azilsartan is adopted as a test sample, and the system applicability, specificity, detection limit, durability and other items prove that azilsartan meets related requirements.