82 results about "Cefditoren Pivoxil" patented technology

A method for enhancing the oral bioavailability of a prodrug ester by formulating the ester as a non-emulsified formulation with lecithin; as well as a pharmaceutical composition of at least one antibiotic and lecithin in a non-emulsified formulation; a method of treating infections with the non-emulsified formulation, and a method for preparing tablets by direct compression of blends of drugs with lecithin are disclosed. Non-emulsified formulations include solids, tablets, capsules, lozenges, suspensions, elixirs and solutions, and exclude emulsions, liposomes, lipid matrix systems and micro-emulsions. A suitable prodrug ester is a cephalosporin β-lactam antibiotic such as cefditoren pivoxil, and a suitable non-emulsified formulation is a solid formulation.

A novel 4-halo-2-oxyimino-3-oxo butyric acid-N,N-dimethyl formiminium chloride chlorosulfate of formula (I) useful in the preparation of cephalosporin antibiotics

wherein

X is chlorine or bromine; R is hydrogen, C_1-4 alkyl group, an easily removable hydroxyl protective group, —CH₂COOR₅, or —C(CH₃)₂COOR₅, wherein R₅ is hydrogen or an easily hydrolysable ester group. The compound of formula (I) is prepared by reacting 4-halo-2-oxyimino-3-oxobutyric acid of formula (IV¹),

wherein X, R and R₅ are as defined above, with N,N-dimethylformiminium chloride chlorosulphate of formula (VII)

in an organic solvent at a temperature ranging from −30° C. to −15° C. The cephalosporins that may be prepared from the intermediate include cefdinir, cefditoren pivoxil, cefepime, cefetamet pivoxil, cefixime, cefmenoxime, cefodizime, cefoselis, cefotaxime, cefpirome, cefpodoxime proxetil, cefquinome, ceftazidime, cefteram pivoxil, ceftiofur, ceftizoxime, ceftriaxone and cefuzonam.

The invention belongs to the technical field of medicines and particularly relates to a preparation method of cefditoren pivoxil. The preparation method particularly includes following steps: (1) carrying out a reaction between cefditoren mother nucleus 7ATCA and AE-activated ester with dichloromethane as a solvent under an alkaline condition at 0-5 DEG C; (2) performing extraction with pure water and adding a sodium iso-octoate/acetone solution to obtain cefditoren sodium; (3) carrying out a reaction between the cefditoren sodium and iodomethyl pivalate under the alkaline condition at -40 DEG C to obtain a cefditoren pivoxil solution; (4) adding pure water to separate out a crystal to obtain a crude product of the cefditoren pivoxil. The technical scheme also comprises steps of dissolving the crude product of the cefditoren pivoxil in a mixed solution including dichloromethane and anhydrous ethanol, washing the material solution with a 1% sodium bicarbonate solution and pure water, collecting an organic phase, and performing a pressure-reducing evaporate-drying process to obtain the cefditoren pivoxil being higher than 99% in purity and less in impurities. The preparation method is simple in operation, is easy to control, is high in yield, allows the raw material to be obtained easily and is suitable for industrialized large-scale production.

The invention relates to a cefditoren pivoxil tablet. The tablet comprises a tablet core and a coating layer, wherein the tablet core contains amorphous cefditoren pivoxil, a filler, a disintegrating agent, a solubilizer and a lubricant, and the filler is a mixture of D-mannitol and beta-cyclodextrin and/or low-substituted hydroxy propyl cellulose. The cefditoren pivoxil tablet avoids the conversion of amorphous cefditoren pivoxil to crystals and has good disintegration and dissolve-out properties under four dissolve-out conditions, and the dissolve-out curve of the cefditoren pivoxil tablet is consistent with the dissolve-out curve of a listed product Meiact.

Processes are provided for the preparation of orally administrable, yellow and powdery compositions essentially consisting of particles composed of a homogeneous mixture of an amorphous Cefditoren pivoxil substance with a water soluble high-molecular additive. These compositions can be produced by dissolving crystalline Cefditoren pivoxil substance and the water-soluble high-molecular additive in an aqueous solution of an acid, then neutralizing the resultant solution, to co-precipitate the product, and drying the thus precipitated product, followed by recovering the product in the form of the above-mentioned particles.

The invention discloses a method for preparing cefditoren pivoxil cephalosporins.The method comprises the following steps that 1, on the presence of TMEDA and sodium phosphate, 7-ATCA and MAEM are subjected to a contact reaction in THF, and a mixture containing cefditore is obtained, and the contact reaction temperature ranges from 0 to 25 DEG C; 2, the temperature is kept, TEA is added to the mixture containing cefditore obtained in the step 1, then iodomethyl pivalate is added to the mixture to be stirred for reacting, the product is poured into water after the reaction is finished, a saturated ammonium chloride solution is added, the pH is adjusted to be 5 to 5.3, filtering is carried out, and a filter cake obtained through filtering is recrystallized in methyl alcohol to obtain cefditoren pivoxil cephalosporins.According to the method, separation treatment is not needed in the intermediate steps, one-pot operation is easy, cost is reduced, the yield is high, the number of by-products is small, aftertreatment is easy, and the method is especially suitable for industrial popularization.

The present invention relates to stable solid dosage form and a dry process for preparing amorphous cefditoren pivoxil solid dosage forms and coating the solid dosage form with one or more layers of aqueous dispersion of film forming agents.

The invention relates to a preparation method of cephalosporin, particularly to a preparation method of cefditoren pivoxil. 7-amino-3-[(Z)-2-(4-methyl-5-thiazolyl) vinyl]-3-cephem-4-carboxylic acid and 2-(2-amino-4-thiazolyl)-2-methoxyiminoacetic are taken as initial raw materials, and the cefditoren pivoxil is obtained through condensation and esterification reactions. The method is simple in process, high in yield, free of highly corrosive solvents and suitable for industrial production.

The invention relates to a preparation method of Cefditoren Pivoxil. The preparation method comprises steps as follows: 7-ACA (3-acetyloxymethyl-5-thio-7-amino-8-oxy-1-nitrogen heterobicyclic octyl-2-ene-2 carboxylic acid) is taken as a starting raw material and is subjected to iodination and Wittig reaction after silanization protection, and a Cefditoren parent nucleus 7-ATCA (7-amino-3-[(Z)-2-(4-methyl-5-thiazole) vinyl]-3-cephem-4-carboxylic acid) is generated; after amino protection of aminothiazole ethyl gallate, a compound 2 is produced from 7-ATCA under catalysis of AlMe3; the compound2 is subjected to an esterification reaction with iodomethyl pivalate under actions of a phase transfer catalyst and an acid adsorbent, the amino protection is removed, and a target product CefditorenPivoxil is obtained. According to the preparation method, reaction conditions are mild, product purity and yield are high, the process is stable, amplification is easy, and the method is applicable to industrial production.

The invention discloses a method for preparing cefditoren pivoxil in the technical field of medicine, which comprises: dissolving a cefditoren pivoxi crude product in a water-soluble solvent; preparing a cefditoren pivoxil organic phase; preparing a cefditoren pivoxil aqueous phase; and adjusting the pH value of the solution, performing acid extraction treatment and menstruum crystallization treatment, and obtaining the cefditoren pivoxil with the purity of 98.1 to 98.8 percent. The method ensures that the cefditoren pivoxil can obtain high-purity products according with pharmacopoeia through purification under stable condition by simple operation.

The invention relates to a medicament composition and method of preparing the same. The medicament composition includes micronized particles of cefditoren pivoxil, wherein the particles have the d0.5 from 1[mu]m to 40 [mu]m. The invention also relates to method for preparing micronized cefditoren pivoxil particles.

An objective of the present invention is to provide a cefditoren pivoxil pharmaceutical preparation which can safely be administered to a patient and not only improves wettability of cefditoren pivoxil, but also further improves absorbability through the intestinal tracts by maintaining amorphous particles having a high oral absorbability in a liquid for a long period of time. The present invention is a pharmaceutical composition comprising amorphous cefditoren pivoxil and a sugar ester fatty acid, which is obtainable by mixing or wet-granulating particles containing amorphous cefditoren pivoxil with the sugar ester fatty acid while amorphous cefditoren pivoxil maintains its particle state.

The invention relates to a Cefditoren pivoxil for suspension and its preparing process, wherein the preparation is prepared from Cefditoren pivoxil, cane sugar, methyl hydroxypropylcellulose, egg white sweets and orange essence through sieving, weighing, mixing homogeneously, charging adhesive, palletizing, forced air drying and granulating.

The invention discloses a preparation method of a cefditoren pivoxil dimer. The preparation method is characterized in that an organic solvent and cefditoren sodium are added to a reaction container,and are stirred and dissolved, the temperature is reduced to subzero 20-subzero 50 DEG C, iodomethyl pivalate is added in batches, and iodomethyl pivalate is added again after reacting for a certain time after each addition of iodomethyl pivalate; inorganic or organic base is required to be added to control pH at 7.5-8.5 during the reaction, and subsequent separation and purification are performedafter the reaction to obtain the product. The preparation method has simple steps, simple raw materials and low cost, and is suitable for large-scale preparation. The content of the cefditoren pivoxil dimer prepared with the preparation method provided can reach 92.0% or higher, a theoretical basis is provided for safe use of drugs, effective data support is provided for the quality standard of cefditoren pivoxil, and effective guarantee is provided for safe clinical use of drugs.

The invention discloses a method for preparing a cefditoren pivoxil open-cycle dimer. The cefditoren pivoxil open-cycle dimer is characterized by being prepared by the following steps of reactions: firstly, protecting amino on cefditoren pivoxil by using Cbz (carbobenzoxyl), carrying out cycle opening so as to obtain a Cbz protected cefditoren pivoxil open-cycle substance, further enabling the Cbz protected cefditoren pivoxil open-cycle substance to react with the cefditoren pivoxil so as to obtain a Cbz protected cefditoren pivoxil open-cycle dimer, and finally removing Cbz protection, so as to obtain a product. The method disclosed by the invention is simple in step, low in cost and applicable to on-scale preparation. The content of the cefditoren pivoxil open-cycle dimer prepared by using the preparation method disclosed by the invention is up to 95.0% or greater, the yield can be up to 58%, theoretic bases are provided for medicine use security, effective data support is provided for quality standards of the cefditoren pivoxil, and effective insurance is provided for clinical use security of medicines.

The invention provides a preparation method of a thiazole compound as shown in a formula II, comprising the following steps of: by taking alkyl nitrite R3NO2 as a diazotization reagent, performing a diazotization deamination reaction on a compound of a formula I in an anhydrous polar solvent at a reaction temperature of 30-80 DEG C to generate the compound as shown in the formula II. The invention further provides a preparation method of a thiazole compound shown in a formula IV, comprising the following steps of: converting an ester group in the compound of the formula II to an aldehyde group so as to prepare the compound shown as the formula IV. The preparation method provided by the invention is moderate in reaction conditions, simple and convenient to operate, few in by-products, small in reaction molar volume, simple in after-treatment, saved in solvent dosage, suitable for industrialized production, environment-friendly, and capable of preparing the high-yield and high-purity key intermediate, namely, 4-methyl-5-formoxyl thiazole, of cefditoren pivoxil.

The invention relates to a cefditoren pivoxil purifying method. The method concretely comprises the following steps: dissolving crude cefditoren pivoxil with low purity in an organic solvent, adding an acid to form a salt, washing the salt, carrying out liquid separation, adding an organic solvent, adjusting the pH value of the obtained solution to 4.0-8.0 by using an alkali, adding the above obtained organic layer to a non-polar solvent in a dropwise manner to obtain an amorphous solid, and crystallizing the amorphous solid by using an organic solvent to obtain purified cefditoren pivoxil with a crystal form. The purity of the final product is 99.0-99.7%, the content of E-isomer is smaller than 0.1%. The method has the advantages of simplicity in operation, mild reaction conditions, obvious improvement of the purity of the product, and facilitation of industrial production.