31 results about "BEPOTASTINE BESILATE" patented technology

A method for splitting a Bepotastine Besilate optical isomer and quantitatively measuring R-isomer impurity is disclosed. According to the invention, high performance liquid chromatography is adopted. A mobile phase contains n-hexane and ethanol. The method is characterized in that normal-phase liquid chromatography is adopted; packing used in a chromatographic column is silica gel with its surface coated with amylase-tris-(3,5-xylyl carbamate); and the mobile phase also contains an alkaline additive. In comparison with the prior art, the method provided by the invention has advantages as follows: the mobile phase is simple to prepare, and resolutions of two isomers are both within 4.5-5.5. Especially, the chromatographic column of the method has good durability, and the chromatographic column still has high column efficiency after having been used for one year. Thus, analytic determination cost is greatly reduced.

The invention discloses a stable bepotastine besilate crystal in novel crystal form through a recrystallization method. The obtained bepotastine besilate crystal is confirmed through X-ray powder diffraction and infrared spectrum. Stability contrast experiments prove that the provided bepotastine besilate crystal has extremely high stability, and both bulk drug and preparation of the bepotastine besilate crystal have stability obviously better than that of existing bepotastine besilate crystals.

The invention provides an industrial preparation method for bepotastine besilate or racemoid of the bepotastine besilate. The method includes the following steps of firstly, dissolving 2-4-[(S)-(4-chlorophenyl)(4-piperidinyloxy)methyl]pyridine or racemate of the 2-4-[(S)-(4-chlorophenyl)(4-piperidinyloxy)methyl]pyridine in an organic solution; secondly, adding an alkaline acid-binding agent and ethyl 4-bromobutyrate, conducting stirring, temperature rising and backflow, and conducting the condensation reaction; thirdly, conducting cooling and filtering after the reaction ends, and conducting organic layer vacuum concentration to obtain grease; fourthly, adding purified water to the grease, conducting stirring, ethyl acetate extraction and skimming to obtain an organic layer, washing the organic layer with alkaline liquid, drying the organic layer, and conducting reduced pressure distillation after filtering out a drying agent to obtain an intermediate; fifthly, adding alkaline liquid in the intermediate for hydrolyzing, adjusting to acid after hydrolyzing, conducting stirring, filtering and concentrating, adding dichloromethane for stirring and drying, and then conducting filtering and reduced pressure concentration again to obtain the bepotastine besilate or the racemoid of the bepotastine besilate. By means of the method, the operation procedure is simplified, reaction time is shortened, no racemization phenomena can occur, and the method has the advantages of being high in yield, easy to operate and the like.

The invention discloses a salt-forming method of bepotastine besilate, wherein the method includes the steps of: 1) adding benzenesulfonic acid monohydrate to organic alcohol, stirring the solution until the benzenesulfonic acid is completely dissolved for later use; 2) dissolving (+)-(S)-4-{4-[(4-chlorophenyl)(2-pyridyl)methoxyl]piperidyl}n-butyric acid in organic alcohol, controlling the temperature at -20 - 20 DEG C and stirring speed at 50-200 rpm, adding a less amount of bepotastine besilate crystal seeds, dropwisely adding the benzenesulfonic acid organic alcohol solution, and then continuously stirring the solution with temperature maintained; and 3) performing crystallization for 1-5 h and filtering the solution, pour-washing a filter cake with the organic alcohol, and performing pressure reduced drying to obtain the bepotastine besilate. The method can form uniform granules in the product, is high in yield, has good impurity removal effect and excellent operability, is low in production cost and high in efficiency, and is suitable for industrial production.

The invention relates to a tablet containing bepotastine besilate or benzene sulfonate thereof and a preparation method of the tablet, and belongs to the technical field of pharmaceutical preparations. The tablet consists of the bepotastine besilate or the benzene sulfonate thereof, a diluent, an adhesive, a disintegrant and a lubricant; and the preparation method of the tablet containing the bepotastine besilate or the benzene sulfonate thereof comprises the following steps: 1) obtaining blank particles, specifically, uniformly mixing the diluent, the adhesive and / or the disintegrant, and adding proper amount of moistening agent and / or binding agent for performing granulation; 2) obtaining granules for tabletting, specifically, uniformly mixing the blank granules with crude drugs, the lubricant and / or the disintegrant; and 3) conducting compression molding, specifically, conducting compression molding on the granules for tabletting by virtue of proper equipment. The bepotastine besilate tablet prepared by the invention has the advantages of being good in repeatability, good in dissolution, good in drug stability, simple and convenient in technological operation and the like.

The invention provides a preparation method of bepotastine besilate. According to a technical scheme in the invention, the preparation method of bepotastine besilate is characterized by comprising the following step: S1, putting an aqueous inorganic alkali solution into a first reaction cavity of a first reaction kettle, then adding a crude bepotastine besilate product and starting a first stirrer for stirring so as to fully mix and disperse the crude bepotastine besilate product and the aqueous inorganic alkali solution. The preparation method has the beneficial effects that bepotastine besylate is convenient and rapid to prepare and high in stability.

The invention relates to a method for preparing a bepotastine besilate key intermediate, in particular to 4-[(4-chlorphenyl)(2-pyridyl)methoxyl]piperidine-1-formate prepared from alpha-(4-chlorphenyl)-2-pyridinemethanol and 4-halogenated piperidine-1-carboxylate through a reaction.

The present invention relates to an improved preparation method of bepotastine bepotastine, which comprises the following steps: the first step, combining 2-[(4-chlorophenyl)(4-piperidinyloxy)methyl]pyridine with Resolving agent reaction, obtain S-2-[(4-chlorophenyl) (4-piperidinyloxy) methyl] pyridine N-acetyl-L-phenylalanine salt, the second step, S ‑2‑[(4‑chlorophenyl) (4‑piperidinyloxy) methyl] pyridine N‑acetyl‑L‑phenylalanine salt plus acid extraction to obtain S‑2‑[(4‑chlorobenzene Base) (4-piperidinyloxy)methyl]pyridine, the third step, S-2-[(4-chlorophenyl)(4-piperidinyloxy)methyl]pyridine sequentially in acetonitrile Coupling reaction with ethyl 4-bromobutyrate, hydrolysis reaction and salt-forming reaction to obtain bepotastine besilate. The technical scheme of the invention greatly improves the yield, shortens the process time, and the obtained product has high purity, safety and stability.

The invention discloses bepotastine besilate, and belongs to the field of organic chemistry and medicinal chemistry. The technical scheme mainly includes that the bepotastine besilate, polymers, plasticizers, lubricating agents a, surface active agents, diluting agents, binding agents, disintegrating agents and lubricating agents b are combined to prepare bepotastine besilate tablets by a hot-meltextrusion technique. The tablets have stability and further have the advantages of high drug dissolution and bioavailability.

The invention relates to a bepotastine besilate tablet and a preparation method thereof, and belongs to the technical field of medicament. The bepotastine besilate tablet is mainly prepared from the following components in parts by weight: 5 to 10 parts of bepotastine besilate, 50 to 90 parts of mannitol, 6 to 12 parts of PEG (Polyethylene Glycol) 6000, 0.2 to 2 parts of hydroxypropyl methyl cellulose, 5 to 10 parts of microcrystalline cellulose and 1 to 3 parts of magnesium stearate. The preparation method is characterized by during a preparation process, firstly, mixing active components, afilling agent and an adhesive, and then adding an adhesive solution prepared from the adhesive and water, thus preparing a soft material; secondly, pelleting; finally, carrying out tabletting and coating on granules with an anti-adhesion agent and a lubricating agent. A preparation technology comprises the following steps of pretreatment of auxiliary materials, mixing, wet granulation, drying, grain finishing, total mixing, tabletting and coating. The bepotastine besilate tablet prepared by adopting the preparation method has good dissolubility and is stable in quality, simple in preparation technology and suitable for large-scale production.

The invention discloses a preparation method of bepotastine besilate tablets. The bepotastine besilate tablets are molded in one step by adopting a hot melting granulation method. The preparation method of the bepotastine besilate tablets, disclosed by the invention, one-step molding is realized by adopting the hot melting granulation method and the preparation method has the advantages of simpletechnology and short heating time; a sample is more easily stabilized and the quality of a product is ensured. Compared with an existing product, three different granulation methods are adopted, so that the effect of an additional auxiliary agent, i.e., a disintegrating agent, is more easily expressed; the disintegrating agent can be corroded and also can be partially disintegrated; products withdissolution similar with an original product can be produced and the preparation method has very good practicability.

The invention discloses a bepotastine besilate nasal spray and a preparation method thereof. For the nasal spray, 1-10 g of bepotastine besilate and 3-15 g of solubilizing composition are added in 100 mL of water; the solubilizing composition comprises components in percentage by weight as follows: 80%-95% of propylene glycol, polyethylene glycol 300 or polyethylene glycol 400 and the balance of caprylocaproyl macrogolglycerides; and pH of a nasal spray solution ranges from 6 to 8. In the composition, bepotastine besilate does not exist in a solid particle mode and cannot be crystallized during a long-term storage process, so that not only is rapid medicine absorption facilitated, but also a spray pump port is not blocked easily, and anaphylactic rhinitis and mucous membrane inflammation related to rhinitis can be cured effectively.

The invention relates to an asymmetric synthesis method of an ophthalmologic drug pylistramine besylate. The method concretely comprises the following steps: oxidizing (4-chlorophenyl)(2-pyridyl)methanone to obtain (4-chlorophenyl)(2-pyridyl)ketone-N-oxide; carrying out asymmetric transfer hydrogenation reduction on the (4-chlorophenyl)(2-pyridyl)ketone-N-oxide through using a complex of monosulfonyl chiral diamine and metallic ruthenium, rhodium and iridium as a catalyst and a sodium formate or formic acid and triethylamine mixture or isopropanol as a hydrogen source in order to prepare (S)-(4-chlorophenyl)(2-pyridyl)methanol-N-oxide; reducing the (S)-(4-chlorophenyl)(2-pyridyl)methanol-N-oxide to prepare (S)-(4-chlorophenyl)(2-pyridyl)methanol; and condensing the (S)-(4-chlorophenyl)(2-pyridyl)methanol and ethyl 4-(4-bromopiperidine-1-yl)butyrate to obtain the ophthalmologic drug pylistramine besylate. The total yield is 61.6%.

The invention discloses a stable bepotastine besilate crystal in novel crystal form through a recrystallization method. The obtained bepotastine besilate crystal is confirmed through X-ray powder diffraction and infrared spectrum. Stability contrast experiments prove that the provided bepotastine besilate crystal has extremely high stability, and both bulk drug and preparation of the bepotastine besilate crystal have stability obviously better than that of existing bepotastine besilate crystals.

A method for splitting a Bepotastine Besilate optical isomer and quantitatively measuring R-isomer impurity is disclosed. According to the invention, high performance liquid chromatography is adopted. A mobile phase contains n-hexane and ethanol. The method is characterized in that normal-phase liquid chromatography is adopted; packing used in a chromatographic column is silica gel with its surface coated with amylase-tris-(3,5-xylyl carbamate); and the mobile phase also contains an alkaline additive. In comparison with the prior art, the method provided by the invention has advantages as follows: the mobile phase is simple to prepare, and resolutions of two isomers are both within 4.5-5.5. Especially, the chromatographic column of the method has good durability, and the chromatographic column still has high column efficiency after having been used for one year. Thus, analytic determination cost is greatly reduced.

The invention belongs to the field of analytical chemistry, in particular to a method for separating and measuring bepotastine besilate and potential genotoxic impurities thereof with a HPLC (High Performance Liquid Chromatography) method. According to the method, an adopted chromatographic column is characterized in that octadecylsilane chemically bonded silica is taken as a filler, a flowing phase A and a flowing phase B are adopted for performing gradient elution, and enter a detector for detecting; the potential genotoxic impurities includes ethyl benzenesulfonate and isopropyl benz-enesulfonate; the flowing phase A is a phosphoric acid solution, and the flowing phase B is an acidic acetonitrile solution. By adopting the method, the contents of the bepotastine besilate and the potential genotoxic impurities thereof can be effectively separated and measured; high sensitivity, specificity and repeatability are achieved; the measurement is not interfered by a solvent peak during detection, and a detection result is accurate and reliable, so that the method has an extremely important significance in realizing quality control for the bepotastine besilate and a preparation thereof.

The invention discloses a refining method for high-purity bepotastine besilate. The refining method is a solvent crystallization method adopting a crude bepotastine besilate product as a raw material and comprises the following steps: firstly, the crude bepotastine besilate product is heated and dissolved with acetonitrile and filtered, a filtrate is cooled, stirred and crystallized, crystals are filtered and dried, and primary refined product is obtained; the primary refined product is heated, stirred, dissolved in water and filtered, a filtrate is cooled, stirred and crystallized, crystals are filtered and dried, and a pure bepotastine besilate product is obtained. The method has the advantages that the operation is simple and convenient, the yield is high, the product is pure, the cost is saved and the like, the total yield is 80% or higher, the purity of the pure bepotastine besilate product is 99.9% or higher proved by HPLC detection, the isomer impurity content is reduced to 0.1% or lower from 0.4%, and other single impurity content is reduced to 0.1% or lower from 0.2%.