54 results about "Nifuratel" patented technology

The invention relates to a medicine producing field, specifically, to an improved producing method of antibacterial medicine nifuratel. The method makes use of thiourea as initial material to produce nifuratel. The improvement is that it is no longer to use methyl mercaptan or methomyl in the known method while producing the intermediate 2-(methylthiomethyl)hydropropane. Furthermore, the invention is no longer to use metal natrium in the known method when the 3-methylthio-2-hydroxy-propylhydrazine and diethyl carbonate are heated to produce N-amido-5-methylthiomethyl-2-oxazolidone in the existance of alkali. All of the improvements largely improve the preparation of the nifuratel, especially for the production condition in a large scale, reduce the environment pollution and benefit to ensure the production safety.

The invention relates to a nifuratel-nysfungin vaginal expandable suppository and its preparation method and detection method. The nifuratel-nysfungin vaginal expandable suppository comprises a drug-containing matrix comprising nifuratel, nysfungin and a matrix, and also comprises an expandable carrier. Through use of colloidal silicon dioxide in the drug-containing matrix, nysfungin hygroscopicity is reduced and suppository stability is improved. Nifuratel, nysfungin, povidone and hydroxypropyl methylcellulose form a skeleton clathrate so that nysfungin and nifuratel stability are further improved and the time of action produced by the active components on the vagina is further prolonged. Propylene glycol monostearate and Tween 80 can promote absorption of the active components by the vagina and suppository bioavailability is improved. The nifuratel-nysfungin vaginal expandable suppository utilizes seven novel lead-edge technologies and has the advantages of drug liquid leakage prevention, high stability, lasting curative effects and secondary infection prevention.

The invention belongs to the field of drug synthesis and provides a novel method for synthetizing nifuratel. The synthesis method of the nifuratel disclosed by the invention innovatively adopts a post-treatment method of 'ethanol with water' to obtain a midbody 3-methyl mercapto-2-hydroxy propyl hydrazine (A1); high-vacuum reduced pressure distillation of the midbody 3-methyl mercapto-2-hydroxy propyl hydrazine (A1) is avoided; the nifuratel is prepared by a 'one-pot' method; preparation of a midbody N-amino-5-methylthiomethyl-2-oxazolidinone (A2) and post-treatment operation of 5-nitro-furfural (B1) are simplified; the purity of the obtained nifuratel product is higher than 99.8%; and the yield is higher than 30%. The synthesis method of nifuratel disclosed by the invention is simple, convenient and easy to control; the post-treatment operation is simple and feasible; industrialized production is facilitated; the used material is available in China; the pollution on the environment is small; and the material is cheap and easily available.

The invention discloses a nifuratel with a optical activity. Specifically, the invention provides a (S)-nifuratel, i.e. (S)-5-[(methylthio)methyl]-3-[(5-nitryl-2-furan)methylene]amido]-2-oxazolidone, the producing method and the combination including the optical activity compound. Compared to the racemic nifuratel, (S)-nifuratel has a better anti-inflammatory and anti-fungi activity. The invention also discloses the producing method for (S)-nifuratel which has the (S)-chloroepoxy propane as initial material, adopts the 3-dimension and selective synthesis method and produce a high optical purity (S)-nifuratel with a high yield.

The invention discloses a preparation process of nifuratel, which is suitable for industrialization, and a purifying method, including: taking 3-ammo-5-[(methylthio)methyl]-2-oxadixyl and 5-nitrofurfuraldiacetate as the initial raw materials, acid-hydrolyzing and docking to generate nifuratel, post-processing and recrystallizating to obtain a highly finished product. The highly finished product obtained by the method has high purity, the operating method is simple, the production cost is low, the yield is high, the preparation process is more suitable for industrialization, and the preparationprocess has the competition in the same processes.

The invention relates to a nifuratel-nysfungin gel and a preparation method of the nifuratel-nysfungin gel. The gel is prepared by nifuratel, nysfungin, hydrogel matrix and other auxiliary materials. According to the invention, the pharmaceutical ingredients are fully dissolved and evenly mixed in the gel matrix, and the pharmaceutical ingredients are fully contacted with the vaginal wall, so that the bacteriostasis of the medicine is fully exerted, and the nifuratel-nysfungin gel is safe and comfortable to use without foreign body sensation and greasy feeling. The nifuratel-nysfungin gel canbe used for treating vulva and vaginal infections and vaginal mixed infection caused by bacteria, trichomonas and candida, thus effectively maintaining the physiological environment of the vagina, providing the survival condition suitable for vaginal beneficial bacterium group and promoting disease recovery.

The invention relates to a method for preparing nifuratel. The method comprises the steps of (1) synthesizing 2-(methylmercapto-methyl)-oxacyclopropane through epoxy chloropropane and sodium methyl mercaptide; (2) generating reaction between hydrazine hydrate and the 2-(methylmercapto-methyl)-oxacyclopropane to synthesize 3-methylmercapto-2-hydroxy-propyl hydrazine; (3) generating reaction between diethyl carbonate and 3-methylmercapto-2-hydroxy-propyl hydrazine to prepare N-amino-5-methylmercapto-methyl-2-oxazolidinone; (4) hydrolyzing 5-nitrofuran formaldehyde diacetate ester under an acidic condition to prepare 5-nitro-2-furaldehyde; (5) generating reaction between the 5-nitro-2-furaldehyde and the N-amino-5-methylmercapto-methyl-2-oxazolidinone obtained in the step (3) to obtain the nifuratel, wherein in the step (1), 15-crown ether-5 is used as a catalyst, so that the conversion rate is high; no organic solvent is used during posttreatment of a product, and the posttreatment is simple.

The invention relates to a nifuratel-nystatin soft capsule-type suppository and a preparation method thereof. Nifuratel-nystatin sol in the nifuratel-nystatin soft capsule-type suppository is preparedfrom the following components in parts by weight: 40-60 parts of nifuratel, 3-5 parts of nystatin, 2-3 parts of carbomer, 1-2 parts of ethylparaben, 50-70 parts of glycerinum, 70-100 parts of ethyl alcohol, 20-30 parts of pH buffer liquid and 700-800 parts of medical pure water. The preparation method comprises the following steps of 1, raw material preparation; 2, liquid medicine preparation, wherein the nifuratel and the nystatin are mixed evenly in a sterile environment, then through a sterile filtering system, sterile filtering is conducted, and then micro-pore filtering is conducted, sothat a liquid medicine is obtained for later use; 3, gel matrix preparation; 4, nifuratel-nystatin sol preparation; 5, capsule pressing; 6, soft capsule-type suppository preparation. The nifuratel-nystatin soft capsule-type suppository and the preparation method thereof have the advantages that body hormone secretion is not affected, the sterilization effect is good, and the preparation method issimple.

The invention discloses a synthetic method of nifuratel. The synthetic method comprises the steps of carrying out a substitution reaction between epoxy chloropropane and sodium methyl mercaptide in the presence of a phase transfer catalyst to obtain epoxy propyl dimethyl sulfide, and then performing hydrazinolysis, cyclization and condensation on the obtained epoxy propyl dimethyl sulfide to obtain the nifuratel. The synthetic method is high in nifuratel yield, high in purity and low in impurity content; besides the method has the advantages that a ring-closure reaction is carried out under the alkaline condition of sodium methoxide, the use of metal sodium is avoided, production safety is ensured, and simultaneously, the reaction is easy to arouse, easy to control in process, the used raw materials are easy to get, basically no waste liquid is generated in the reaction of each step, and therefore, industrial pollution is greatly reduced; and as a result, the synthetic method of nifuratel is applicable to industrial production.

The invention belongs to the field of medical preparations and discloses a nifuratel compound tablet and a preparation method thereof. The nifuratel compound tablet disclosed by the invention has the following advantages of high disintegration speed and dissolving rate, excellent stability, exact dosage, convenience to take and carry, easily-obtained raw materials and low cost. The preparation method of the nifuratel compound tablet is simple in operation, easy to control, time-saving, labor-saving and beneficial for large-scale industrial production.

The invention provides a nifuratel gel and the related preparation method. The invention is made of nifuratel as the raw material, a gel substrate carbomer and other relative auxiliary materials and used to cure vulvar and vaginal infections and vaginal mixed infections caused by germs, trichomonads and candidas. The invention has the advantages of obvious curative effect, relative stable quality, and is convenient to carry and take, and is safe and sanitary. The invention is comprehensively improved in quality, and enriches the medication varieties after the formulation is changed, thus the invention has great significance for further meeting and guaranteeing the medication requirements of people.

The invention belongs to the technical field of synthesis of medicines and particularly relates to a nifuratel preparation method. The nifuratel preparation method comprises the following steps: taking epoxy propyl dimethyl sulfide as the starting material, having a ring-opening reaction with tert-butyl carbazate to obtain N'-(2-hydroxyl-3-methylmercapto-propyl)-tert-butyl carbazate; having a ringclosing reaction with urea under the catalytic action of cuprous bromide, obtaining a key intermediate N-(Boc-amino)-5-methylmercapto-methyl-2-oxazolidinone; hydrolyzing 5-nitro furfural diacetate under the action of trifluoroacetic acid to obtain 5-nitrofurfural, condensing with N-(Boc-amino)-5-methylmercapto-methyl-2-oxazolidinone, and obtaining nifuratel. In the process route, the cheap easy-to-get agents are chose, the operation difficulty and the processing burden caused after the reaction are reduced, the environmental harm is reduced, the production safety is guaranteed, and the preparation method is an easy, green and economical process route for the preparation of the nifuratel.

The invention relates to the technical field of drug analysis, and in particular relates to a method for controlling impurities of a nifuratel vaginal tablet. The method is a gradient elution method with a detection wavelength of 260 nm. The mobile phase is phase A: a 9 to 11 mM KH2PO4 solution, and a potassium hydroxide aqueous solution is used to adjust pH. The volume ratio of phase B: acetonitrile: methanol is 18:82 to 22:78. The method provided by the invention can solve the problems of excipient interference and impurity separation at the same time, and can comprehensively and effectivelydetect the content of each impurity. An effective method is provided for impurity control of nifuratel in preparation. The method provides a basis for the formulation of preparation quality standards.

The invention relates to a vaginal repair technology, and specifically relates to a bacteriostatic tablet having vagina tightening effects. The bacteriostatic tablet consists of, by weight percentage,10-15% of AFGF freeze-dried powder, 10-15% of BFGF freeze-dried powder, 10-15% of diguanosine tetraphosphate, 5-10% of nifuratel, 5-15% of an adhesive, 30-50% of a filling agent, 2-10% of a disintegrating agent and 2-10% of a lubricating agent. The advantages of the bacteriostatic tablet are as follows: required nutrients can be provided; cell tissue of vagina can be fully nourished to keep the vagina lively; female vaginal mucosa and vagina can be repaired, inflammation diminishing, sterilization and peculiar smell removing can be realized, and functions of female self cleaning systems can be improved; broken fiber layers and damaged muscle layers can be rapidly repaired; the secretion of hormones can be stimulated, and the synthesis and secretion of collagen and elastic fiber can be promoted; and as the tablet is rich in sexual nerve repair factors, the sensitivity, pleasant sensation and happiness sensitivity can be effectively enhanced.

The invention provides a nifuratel solid preparation and a preparation method thereof. A nifuratel solid dispersion is contained. The solid dispersion comprises a nifuratel crude drug and an auxiliary material A. The auxiliary material A is selected from one or more of lactose, polyethylene glycol and mannitol. A preparation method of the nifuratel solid dispersion includes the steps that the nifuratel crude drug and the auxiliary material A are taken and mixed in a ball-milling mode in proportion, wherein the ball-milling mixing time ranges from 10 min to 360 min every kg of the nifuratel crude drug. The nifuratel solid dispersion and a nifuratel tablet containing the nifuratel solid dispersion have the high dissolution rate and bioavailability.

The invention relates to a nifuratel nystatin soft capsule and a preparation method thereof. The content of the soft capsule consists of nifuratel, nystatin, olive oil and medicinal vaseline. The capsule shell of the soft capsule comprises gelatin, glycerol, water and epsilon-polylysine. According to the nifuratel nystatin soft capsule, the formula of the nifuratel nystatin soft capsule is optimized, the olive oil is used for replacing the conventional medicinal soybean oil, and the epsilon-polylysine is used as the preservative so that the irritation of the nifuratel nystatin soft capsule to the vagina is reduced.

The invention belongs to the technical field of drug synthesis and in particular relates to a preparation process of an anti-infective drug nifuratel. The preparation process comprises the following steps: taking iodomethane, sodium sulfide and chlorocyclopropane as initial raw materials to obtain epoxy propyl methyl sulfide, carrying out ring-opening reaction with hydrazine hydrate to obtain 3-methylmercapto-2-hydroxyl-propylhydrazine, carrying out a ring-closure reaction to obtain N-amino-5-methylthiomethyl-2-oxazolidinone, hydrolyzing 5-nitro furfural diacetate in the presence of trifluoroacetic acid to obtain 5-nitro-2-furancarboxaldehyde, and performing condensation with N-amino-5-methylthiomethyl-2-oxazolidinone, thereby obtaining the nifuratel. Safe and cheap reagents are selected in the process route, and environment hazards are reduced. Meanwhile, the operating difficulty and reaction after-treatment burdens are reduced, the production safety is ensured, the process is a simple, green and economic process route for preparing the nifuratel, and the obtained product is high in yield, excellent in purity and suitable for large-scale industrial production of the nifuratel.

The invention belongs to the field of medicine synthesis, and discloses a synthetic method of nifuratel. The synthetic method of nifuratel is to carry out ring closing reaction under the alkaline condition of sodium methoxide, therefore, the metallic sodium can be avoided being used, and the safety in production can be ensured; meanwhile, the reaction is easy to generate, the process is easy to control, high yield of the synthesized nifuratel is achieved, few impurities are generated, and the quality is stable; and moreover, the synthetic method of nifuratel is simple in operation, and the raw material is easy to obtain; the used solvent and the raw material out of the reaction can be recycled along with low cost; no waste liquid is generated in each step of the reaction; the pollution is greatly reduced; and the synthetic method is suitable for industrial production.