39 results about "Trimethylbromosilane" patented technology

The invention relates to a novel method for preparing tenofovir, in particular to a method for preparing a tenofovir compound, in particular the monohydrate of the tenofovir for resisting hepatitis B viruses and human immunodeficiency viruses. The method comprises the following steps of: using (substituted) triphenylchloromethane XIII to protect hydroxy in the end position of (R)-1,2-propanediol,condensing the obtained product with dialkyl sulfonyloxy methyl phosphonate V to obtain XV, hydrolyzing the XV in the aqueous solution of an organic acid to remove the protective group of the hydroxyl at the end position of XV to obtain an intermediate XI, condensing sulfonate XII of the intermediate XI with adenine to obtain an intermediate VII, transforming the intermediate VII into the corresponding trimethylsilyl phosphonate VIII by trimethylsilyl bromide (TMSBr), and hydrolyzing the VIII to obtain the target product. The method has the advantages of short process route, convenient operation, low cost and easy access of raw materials and favorability for large scale production.

The present invention discloses one improved preparation process of Adefovir dipivalate. In the synthesis of the mother compound 9-[2-(phosphinocarboxyl methoxy) ethyl adenine, trimethyl chlorsilane, rather than expensive trimethyl bromosilane, as material and potassium iodide as nucleophilic reagentare used to reduce cost while the product yield and quality is maintained. The production process of the present invention may be used in industrial production.

The invention relates to a synthesis method for making cefpirome sulfate. The method comprises the following steps that: cefotaxime and 2, 3-cyclopenopyridine, with the molar ratio of between 1:7 and 1:12, are mixed with trimethyl bromosilicane used as protecting agent inside organic solvent to carry out substitution reaction, thereby generating cefpirome dihydrobromide; and the salt-forming reaction of the cefpirome dihydrobromide is carried out to make cefpirome sulfate. According to the synthesis method of cefpirome sulfate provided by the technical proposal of the invention, cefotaxime and trimethyl bromosilicane are respectively used as raw material and protecting agent to make cefpirome sulfate. Because enough supply and technical maturity of cefotaxime are realized in China and trimethyl bromosilicane is more active than trimethylchlorosilane and is cheaper than trimethyliodosiliane, the synthesis method has the advantages of low cost of raw material, high yield, simple synthetic route and convenient operation.

The invention provides a tenofovir preparation method suitable for industrialized production. According to the method, tenofovir is obtained through catalyzing and hydrolyzing a raw material intermediate (R)-9-[2-(diethylphosphonomethoxy)propyl]adenine via trimethylbromosilane, wherein the raw material intermediate (R)-9-[2-(diethylphosphonomethoxy)propyl]adenine is obtained through the following steps: firstly, obtaining (R)-9-(2-hydroxypropyl)adenine via the ring-opening condensation of adenine and (R)-epoxypropane under an alkaline condition; secondly, catalyzing the (R)-9-(2-hydroxypropyl)adenine through lithium t-butoxide; thirdly, conducting etherification on the catalyzed (R)-9-(2-hydroxypropyl)adenine and p-benzenesulfonyloxymethyl phosphoric acid diethylester, so as to obtain the (R)-9-[2-(diethylphosphonomethoxy)propyl]adenine. The method is characterized in that purified water of appropriate proportion is added in a mixed product obtained through catalyzing and hydrolyzing the (R)-9-[2-(diethylphosphonomethoxy)propyl] adenine via trimethylbromosilane; the tenofovir is obtained through spontaneous crystallization at an appropriate temperature and cooling rate, as well as at an appropriate stirring speed. According to the invention, the obtained tenofovir product has the characteristics of high yield, strong indissolubility in operation under room temperature, simplicity in filtration and collection due to large particles, short production time, low energy consumption, and the like.

The invention provides a synthesis method of 5-chloro-7-azaindole. The synthesis method comprises the following steps: (1) reacting a dilithium initiator and trimethylbromosilane to prepare silicon-containing organic lithium; (2) reacting 2-amino-3-methylpyridine and di-tert-butyl dicarbonate to prepare 2-N-BOC-amino-3-methylpyridine; (3) performing lithiation on the 2-N-BOC-amino-3-methylpyridine through the silicon-containing organic lithium, and performing delithiation activation, cyclization and dehydration to prepare 7-azaindole; (4) performing hydrogenation reduction reaction on the 7-azaindole to generate 2,3-dihydro-7-azaindole; (5) performing chlorination reaction on the 2,3-dihydro-7-azaindole through liquid chlorine to generate 5-chloro-2,3-dihydro-7-azaindole; and (6) performing dehydrogenation reaction on the 5-chloro-2,3-dihydro-7-azaindole to obtain 5-chloro-7-azaindole. The synthesis method provided by the invention has the advantages of mild conditions and high yield.

The invention relates to a method for synthesizing a pharmaceutical intermediate nitrogen heterocyclic bromo-compound. The method comprises that 6-bromoisoquinoline, dichloromethane and m-chloroperoxybenzoic acid as raw materials undergo a reaction to produce a mixture 6-bromoisoquine oxynitride, phosphorus oxychloride is added into the mixture so that solid and water phase products are obtained,the solid products are dried, the water phase products are repeatedly washed and are extracted multiple times, the organic phase is spin-dried, the solid and water phases are treated so that 6-bromo-1-chloroisoquinoline is obtained, the solid crude product and the water crude product are mixed, the mixture is treated through a silica gel column of 100-200 meshes, the mixture is eluted through a petroleum ether PE: ethyl acetate EA eluent A to form a pure product 6-bromo-1-chloroisoquinoline, trimethylbromosilane, acetonitrile and 6-bromo-1-chloroisoquinoline undergo a reaction, pH of the reaction product is adjusted to 7 so that 1, 6-dibromoisoquinoline is obtained, and the 1, 6-dibromoisoquinoline is added into dichloroditriphenyl phosphine and a homemade Grignard reagent so that a finalproduct 6-bromo-1-methylisoquinoline is obtained. The method has the advantages of clear processes, less waste, high yield, raw material saving and operation easiness.

The invention provides a preparation method of a stable silicon coated pure-phase CsPb2Br5 inorganic nanocrystal. The preparation method comprises the following steps: adding octadecene, oleic acid and APTES into cesium carbonate and anhydrous lead acetate to prepare a reaction precursor solution, performing heating and stirring, performing heating to 60 DEG C under vacuum, and introducing nitrogen to remove reaction gas generated in the heating process; cutting back to vacuum, heating to 90 DEG C, and introducing nitrogen; heating to 120 DEG C in vacuum, keeping the temperature until cesium carbonate and anhydrous lead acetate are completely dissolved, introducing nitrogen, heating to 140-150 DEG C, injecting trimethylbromosilane, reacting for 1 hour, and cooling to room temperature; andperforming mixing with methyl acetate, and purifying the mixture for seven times to obtain the stable silicon-coated pure-phase CsPb2Br5 nanocrystal. According to the method, a silicon shell layer isprepared by adopting APTES, the stability of the nanocrystal is improved, the structure of the silicon shell layer is not damaged after multiple times of purification, and the high stability is achieved while it is guaranteed that the pure-phase CsPb2Br5 nanocrystal is synthesized.

The invention discloses a method for synthesizing bromotrimethylsilane, and relates to a synthetic production technology for a chemical product. The method comprises the following steps of: under oxygen-free conditions, stirring in a reaction kettle in which phosphorus tribromide and silyl ether are sequentially added, raising the temperature to 1005 DEG C, keeping the temperature, performing reflux reaction for 60.5 hours, rectifying under normal pressure to obtain the bromotrimethylsilane, and stopping to receive a finished product of the bromotrimethylsilane when the temperature in the kettle is raised to 135 DEG C. By the method, a silyl ether-phosphorus tribromide method is improved and innovated, side reactions are avoided, the obtained product has purity, and the finished product of the bromotrimethylsilane which has the content of about 99 percent can be obtained; and the stirring at normal temperature is changed into high-temperature reflux, so that the reaction time is greatly shortened.

The invention discloses a high-regioselectivity bromination method for phenol compounds. According to the high-regioselectivity bromination method, bromotrimethylsilane serving as a bromination reagent, aryl sulfoxide serving as an activating agent and the phenol compounds are stirred and react for 1-12 hours at the temperature of 0-50 DEG C in a solvent and under the nitrogen atmosphere, thus high-regioselectivity bromination of the phenol compounds is achieved, and bromophenol compounds are obtained by separating and purifying through filtering, extraction or column chromatography methods. The high-regioselectivity bromination method adopts the aryl sulfoxide as the activating agent, the sulfoxide substituent group is large, on the one hand, regioselectivity of a phenol compound bromination reaction is high, when the hydroxyl para-position of the phenol compounds has no substituent group, a product of para-bromination is obtained in a regioselectivity mode, however when the hydroxylpara-position of the phenol compounds has the substituent group, a product of ortho-bromination is obtained in a regioselectivity mode, on the other hand, by-products can be simultaneously recycled byseparating and purifying through the filtering and extraction methods, and the separating and purifying costs are lowered compared with the column chromatography.

The invention belongs to the field of pharmaceutical synthesis. A preparation method of high-stability adefovir dipivoxil is characterized by comprising the following steps: 1) a compound 1 undergoestrimethylbromosilane substitution, followed by hydrolysis with a NaOH aqueous solution to obtain a compound 2; 2) the compound 2 and a compound 3 are catalyzed by triethylamine in N-methylpyrrolidoneto obtain a compound 4; 3) the compound 4 is refined to obtain a compound 5, namely [[2-(6-amino-9H-purine-9-yl)ethoxy]methyl]phosphodi(pivaloyloxymethyl)ester. The preparation method of high-stability adefovir dipivoxil has advantages of good stability of bulk drugs and simple production process, and is suitable for large-scale commercial production.

The invention discloses a preparation method of 3-bromopropionitrile, wherein the preparation method comprises the following steps: taking acrylonitrile as a raw material, carrying out trimethylbromosilane intermolecular addition reaction, and distilling and purifying to obtain high-purity 3-bromopropionitrile. According to the method, cheap acrylonitrile is used as the raw material, and the high-purity 3-bromopropionitrile is obtained through the trimethylbromosilane intermolecular addition reaction and finally distillation and purification; the raw material is cheap and easy to obtain, and the method is suitable for commercial production, environmentally friendly, small in amount of generated three wastes and high in yield.

The invention discloses a preparation method of (R)-9-[2-(phosphoryl methoxyl)propyl]-adenine, and relates to a preparation method of an antiviral drug for an acquired immune deficiency syndrome. The method comprises the steps that when (R)-9-[2-(diethyl phosphoryl methoxyl)propyl]-adenine is prepared, (R)-hydroxypropyl adenine and diethyl p-toluenesulfonyloxymethylphosphonate (DESMP) are subjected to a condensation reaction under the action of magnesium tert-butoxide to generate the (R)-9-[2-(diethyl phosphoryl methoxyl)propyl]-adenine; PMPA diethyl ester is subjected to deethylation through trimethylbromosilane by taking water as solvent to obtain the (R)-9-[2-(phosphoryl methoxyl)propyl]-adenine (PMPA). According to the technology, the product yield is increased, the technology is cleaner, the production cost is lowered, the product yield is increased, the raw materials are easy to obtain, and industrialization is easy to achieve.

The invention relates to a method for preparing P-[[[1-[(2-amino-9H-purine-9-yl) methyl] cyclopropyl] oxy] methyl]-phosphoric acid (Besifovir). The method comprises the following steps: 1) enabling acompound of formula (1) as shown in the specification to react with tertiary butyl diphenylchlorosilane so as to prepare a compound of formula (2) as shown in the specification; 2) enabling the compound of formula (2) to react with ethyl magnesium bromide so as to prepare a compound of formula (3) as shown in the specification; 3) enabling the compound of the formula (3) to react with p-toluenesulfonyl oxymethyldiethoxyphosphine under a condition that tertiary butanol lithium is adopted as an alkali so as to prepare a compound of formula (23) as shown in the specification; 4) carrying out ammonium fluoride hydrolysis on the compound of formula (23) so as to prepare a compound of formula (24) as shown in the specification; 5) enabling the compound of formula (24) to react with a compound offormula (28) as shown in the specification so as to prepare a compound as a solid of formula (22) as shown in the specification; 6) carrying out reduction dechloridation on the compound of formula (22) as shown in the specification under a condition of a catalyst and a hydrogen supplier so as to prepare a compound as a solid of formula (25) as shown in the specification; 7) carrying out trimethylbromide silane hydrolysis on the compound of formula (25), so as to obtain Besifovir as shown in the specification. The method is cheap in raw material and intermediate material, easy in raw materialand intermediate material obtaining, low in cost, high in yield, gentle in condition and good in security.

The invention discloses a preparation method of adefovir. The preparation method comprises the following steps: adding 9-[2-(diethoxylphosphorylmethoxyl)ethyl]adenine into a water solution of HBr, heating to carry out reactions, cooling, and adjusting the pH to 2-3.5 to precipitate white solids namely white adefovir. The preparation method has the advantages that during the hydrolysis of 9-[2-(diethoxylphosphorylmethoxyl)ethyl]adenine, the step of evaporating organic solvents is eliminated, the reaction time is reduced, thus the preparation time is shortened; trimethyl iodo-silane, trimethyl bromo-silane, or trimethyl chloro-silane is replaced by a water solution of HBr, and the cost is reduced by nearly 100 to 400 yuan. Secondary solvent acetonitrile is not used, influence of pollution and solvent residue on drug quality is reduced; trimethyl bromo-silane is easy to decompose and is harmful to human body, and after HBr substitution, the harm to workers is largely reduced.

The invention discloses a method for preparing a 1,8-cineole derivative from 3-carene, which comprises the following steps: reacting 3-carene with N-bromosuccinimide at room temperature to generate a product A with 3-hydroxy-4-bromo-carane as a main component; reacting the product A under the action of trimethylbromosilane and the like to generate a product B, and conducting separating and purifying to obtain 2-bromo-1,8-cineole; then conducting reacting with ammonia water to generate a mixture of 2-hydroxy-1,8-cineole and 2-amino-1,8-cineole; adding HCl to convert the 2-amino-1,8-cineole into ammonia salt, separating out the ammonia salt in an organic solvent, and separating the ammonia salt from the 2-hydroxy-1,8-cineole; and dissolving the solid ammonia salt in water, adding alkali to convert the ammonia salt into amine again, and extracting and recycling the amine through an organic solvent. The conversion rate of all reaction raw materials is close to 100%, and the total selectivity of 2-hydroxy-1,8-cineole and 2-amino-1,8-cineole is greater than 98%.

The present invention discloses a tenofovir microcapsule and a preparation method thereof, and relates to the technical field of tenofovir. The tenofovir comprises the following components according to parts by weight: 56-60 parts of R-propylene oxide, 32-35 parts of diethyl p-toluenesulfonyloxymethylphosphonate, 2-4 parts of adenine, 12-15 parts of trimethyl bromo-silicane and 7-9 parts of dimethoxyethoxy aluminum hydride; and the microcapsule comprises the following components in parts by weight: 22-25 parts of chitin, 15-17 parts of microcrystalline cellulose, 14-16 parts of sodium alginate, 3-6 parts of hydrolase, 4-6 parts of thioglycolic acid, 6-8 parts of glucose, 4-5 parts of epichlorohydrin, 3-9 parts of an oil phase, 1-3 parts of a curing agent and 2-3 parts of a dispersing agent. The tenofovir capsule is improved in absorption rate and also relatively small in smell.

The invention belongs to the technical field of a fuel battery and particularly relates to a phosphoric acid grafted polyimide high-temperature proton exchange membrane and a preparation method thereof. The proton exchange membrane is prepared by a method comprising the following steps: firstly performing a bromination reaction on a benzene ring of a common diamine monomer to obtain bromized diamine; replacing bromine on the bromized diamine with phosphonate by using n-butyllithium and chlorophosphate so as to obtain phosphate grafted diamine; performing polycondensation reaction by using the phosphate grafted diamine, the common diamine and dianhydride to prepare the polyimide; and finally hydrolyzing the phosphonate on the polyimide by using trimethyl bromo-silicane and hydrochloric acid to prepare the phosphoric acid grafted polyimide high-temperature proton exchange membrane. The proton exchange membrane prepared by the method disclosed by the invention is excellent in proton conduction capability at a high temperature; the phosphoric acid is chemically boned in a polymer, hard to leak and good in hydrolysis resistance and stability; the phosphoric acid can also cooperate with N in the polyimide to form a continuous hydrogen bond network so as to realize water-free proton conduction.