92 results about "Trifluoroacetic acid anhydride" patented technology

A trifluoroacetic anhydride processing technique is provided, which utilizes the trifluoroacetic acid and the phosphorus pentoxide as raw materials. The material usage rate (weight) of the trifluoroacetic acid and the phosphorus pentoxide is 1 : 1.5 to 1 : 0.65 and the phosphorus pentoxide is added twice. The entire operation process is done in the fully sealed state, the high boiling substance (after cut) and the tail gas are treated and recycled after collecting the finished products; the condensing water and the cooling water are water from deep well and the byproduct phosphoric acid are all recycled. The invention prepares the trifluoroacetic anhydride applied in the highly efficient liquid chromatogram and the derivating agent of the gas chromatogram, the solvent, catalyst, the condensation dehydration agent and the retention agent of various synthetic reaction, which has complete, canonical and reasonable process and convenient operation, therefore is suitable for industrial production, can effectively improve the purity and the yield of the products, has no environment pollution and reduces the production cost.

The invention provides N-full-aromatic hydrocarbon diamine-bisphenol tetrafunctional fluorenyl benzoxazine and a preparation method thereof. The method comprises the following steps: firstly, protecting amino in 2,7-diamino-9,9-bis-(4-hydroxyphenyl) fluorene by using trifluoroacetic anhydride to generate 2,7-bistrifluoroacetamido-9,9-bis(4-hydroxyphenyl) fluorene, and then carrying out Mannich condensation reaction with aromatic amine and paraformaldehyde to form a 2,7-bistrifluoroacetamido bisphenol fluorenyl benzoxazine monomer; carrying out amino deprotection, and then carrying out secondary Mannich condensation reaction with a phenolic compound and paraformaldehyde to finally obtain a novel N-full-aromatic hydrocarbon diamine-bisphenol tetrafunctional fluorenyl benzoxazine monomer. By adopting the N-full-aromatic hydrocarbon diamine-bisphenol tetrafunctional fluorenyl benzoxazine and the preparation method thereof, the problems that the fluorenyl polybenzoxazine with a large steric hindrance structure is small in molecular weight, low in crosslinking density and poor in tenacity, and the thermal performance is reduced by introducing a flexible group are solved, the processing property of the polymer is improved, and controllable structure and performance of polybenzoxazine are achieved.

The invention provides a preparation method of 1,1,1,5,5,5-hexafluoro acetylacetone. The preparation method comprises the following steps: carrying out first-stage reaction on trifluoroacetyl acetate and trifluoroacetic anhydride under the action of a catalyst at 40-60 DEG C for 5-10 hours; then raising the temperature to 120-150 DEG C for second-stage reaction, and distilling out the resulting 1,1,1,5,5,5-hexafluoro acetylacetone while reacting to obtain a crude 1,1,1,5,5,5-hexafluoro acetylacetone product; and finally purifying the crude product to obtain a refined 1,1,1,5,5,5-hexafluoro acetylacetone product. In the preparation method provided by the invention, as inexpensive trifluoroacetic anhydride and trifluoroacetyl acetate are used as raw materials for the reaction, the cost of the product is dramatically reduced; and as no acid is generated in the reaction process, the environmental pollution is low.

The invention discloses a method for synthetizing a 2-trifluoromethyl oxazole compound. According to the method, trifluoroacetic anhydride is used as a reaction reagent; an oxime ester derivative is used as a reaction substrate; a tellurium compound and iodine are used as catalysts; in a solvent, heating is performed at 110 to 120 DEG C; stirring reaction is performed for 1 to 8h; the 2-trifluoromethyl oxazole compound is prepared. The synthesis method has the advantages that the yield is high; the raw materials can be easily obtained; the operation is simple and convenient; the functional group universality is good, and the like. Good industrial application prospects are realized.

The invention discloses a novel preparation method of Vildagliptin. The preparation method comprises that L-prolinamide as a raw material, chloroacetyl chloride and tetrahydrofuran undergo an acylation reaction, the reaction product is subjected to suction filtration, the filtrate and trifluoroacetic anhydride directly undergo a dehydration reaction without filtrate separation purification to produce (-)-(2S)-1-chloroacetylpyrrolidine-2-carbonitrile (II), the refined (-)-(2S)-1-chloroacetylpyrrolidine-2-carbonitrile, 3-amino-1-adamantanol (III), potassium carbonate and potassium iodide undergo a reaction to produce (-)-(2S)-1-[[(3-hydroxytricyclo[3.3.1.1[3,7]]dec-1-yl)amino]acetyl]pyrrolidine-2-carbonitrile (I) in acetone, and the (-)-(2S)-1-[[(3-hydroxytricyclo[3.3.1.1[3,7]]dec-1-yl)amino]acetyl]pyrrolidine-2-carbonitrile (I) is refined by calcium double salt, ethyl acetate and butanone to form pure Vildagliptin (compound wg-0). The improved synthesis technology has the advantages of less reaction steps, operation simpleness, after-treatment simpleness, low employee cost, equipment cost and time cost, high yield, high product quality and industrialization feasibility.

The invention discloses a qualitative and quantitative method for various biogenic amines in white wine and belongs to the technical field of white wine analysis and detection. According to the qualitative and quantitative method, the liquid-liquid extraction is utilized to enrich the biogenic amines in the white wine; derivation is required by both gas phase qualitative treatment and liquid phase quantitative treatment; a derivation agent adopted by the gas phase is TFAA (Trifluoroacetic Anhydride); and dansyl chloride precolumn derivatization is taken as the derivation agent for the liquid phase. According to the method provided by the invention, 9 biogenic amines are firstly determined in the white wine; the limit of detection of the quantitative method can be reduced to about 10ug/L; the linearly dependent coefficient is more than 0.99; the recovery rate is 80.19%-104.05%; the relative standard deviation is within 4%; the biogenic amines in the white wine can be detected by using the qualitative and quantitative method; the feasibility is excellent; and the precision is high.

The invention discloses a method for synthesizing a trifluoromethyl-1,2,4-triazinone compound through copper catalyzed synthesis. The method comprises the following steps: by taking copper salt as a catalyst, and nitrine, alkyne and trifluoroacetic anhydride as raw materials, adding triethylanmine, stirring for 1-16 hours at room temperature in a tetrahydrofuran solvent, and after the reaction is completed, treating a reaction liquid, thereby obtaining the trifluoromethyl-1,2,4-triazinone compound. The synthesis method disclosed by the invention has the advantages of being cheap in catalyst price, low in toxicity, gentle in reaction condition, high in yield, easy in raw material obtaining, simple and convenient to operate, high in functional group universality and the like, and has good industrial application prospects.

Surface preparation of a compound semiconductor surface, such as indium antimonide (InSb), with a triflating agent, such as triflic anhydride or a trifluoroacetylating agent, such as trifluoroacetic anhydride is described. In one embodiment, the triflating or trifluoroacetylating passivates the compound semiconductor surface by terminating the surface with triflate trifluoroacetate groups. In a further embodiment, a triflating agent or trifluoroacetylating agent is employed to first convert a thin native oxide present on a compound semiconductor surface to a soluble species. In another embodiment, the passivated compound semiconductor surface is activated in an ALD chamber by reacting the triflate or trifluoroacetate protecting groups with a protic source, such as water (H₂O). Metalorganic precursors are then introduced in the ALD chamber to form a good quality interfacial layer, such as aluminum oxide (Al₂O₃), on the compound semiconductor surface.

The invention discloses a high performance liquid chromatography detection method for the abamectin content in edible vegetable oil. The method comprises the steps that a sample is subjected to vortex oscillation extraction through methanol, purified with an ODS C18 solid-phase extraction column, subjected to derivatization through N-methylimidazole and trifluoroacetic anhydride and lastly determined through a liquid chromatography-fluorescence method. According to the method, few reagents are adopted, and the cost is reduced; a sample pretreatment method is simple, the purification effect is good, maintenance of instruments in the using process is reduced, and the technical problems that when a liquid chromatography-ultraviolet detector is used, the sensitivity is too low, and matrix interference is serious are solved; a determined result is accurate and good in repeatability, the detection specificity and sensitivity are high, and a reference is provided for detection of the abamectin content in the edible vegetable oil.

The invention discloses a clean and high-conversion-rate preparing method of 2,2,2-trifluroacetophenone. The method includes the following steps of S1, making N,O-dimethylhydroxylamine hydrochloride as the raw material react with organic alkali to obtain free N,O-dimethylhydroxylamine; S2, making trifluoroacetic anhydride react with free N,O-dimethylhydroxylamine to generate N,O-dimethyltrifluoroacetamide; S3, making a Grignard reagent react with N,O-dimethyltrifluoroacetamide to prepare trifluroacetophenone, recovering N,O-dimethylhydroxylamine generated in the step S1, applying N,O-dimethylhydroxylamine to the step S2, and recycling the reaction solvents used in the steps S1, S2 and S3. By means of the preparing method, prepared high-nucleophilicity N,O-dimethyltrifluoroacetamide reactswith the Grignard reagent, 2,2,2-trifluroacetophenone is efficiently prepared, meanwhile produced byproducts can be applied for preparing N,O-dimethyltrifluoroacetamide, and a recycling effect is achieved.

A method for preparing S-(perfluoroalkyl)-dibenzothiophenium trifluoromethanesulfonate shown as a general formula (I) by a one-pot process with significant effects is disclosed by the invention. The method includes reacting a biphenyl compound, perfluoroalkyl sulfonate, trifluoroacetic anhydride and trifluoromethanesulfonic acid. The biphenyl compound can be recovered and utilized so that the method is an environmentally friendly preparing method.

The invention discloses a gas chromatographic column pretreatment method for high-viscosity alcohol or/and amines. The pretreatment method comprises the following steps of: placing 0.5-1mL of derivatization reagent trifluoroacetic anhydride in a volumetric flask with the volume of 5mL; adding 10-50mg of high-viscosity alcohol or/and amines in the volumetric flask at the temperature of 0-5 DEG C; oscillating the mixture for 0.5-1 minute; reacting for 10-30 minutes at the temperature of 30-60 DEG C; and cooling to the temperature of 20-25 DEG C to obtain a sample for gas chromatography detection. The pretreatment method is mainly used for quickly analyzing high-viscosity alcohol or/and amines.

The invention discloses a method for quantitating abamectin, alachlor and procymidone in edible vegetable oil. A sample is subjected to methanol vortex oscillation extraction and purified with an Envi-18 solid-phase extraction column, the content of alachlor and procymidone in part of the sample is directly analyzed with a gas chromatograph, the rest sample is subjected to derivatization with N-methylimidazole and trifluoroacetic anhydride, and the content of abamectin is determined with a liquid chromatogram-fluorescence method. Fewer reagents are adopted in the method, abamectin, alachlor and procymidone in the edible vegetable oil can be effectively extracted, and the cost is saved; the sample pretreatment method is simple, a cleaner loading solution is provided, and maintenance of instruments during usage is reduced; measured results are accurate, the repeatability is good, detection specificity and sensitivity are high, and the reference is provided for simultaneous detection of the content of abamectin, alachlor and procymidone in the edible vegetable oil.

The invention provides a synthetic method of an efavirenz key intermediate. The synthetic method comprises the following steps: carrying out reaction on parachloroaniline and pivaloyl chloride to protect amino to obtain N-(4-chlorphenyl)-2,2-dimethyl propanamide; carrying out Friedel-Crafts acylation reaction on the product and Friedel-Crafts acylation under action of aluminum trichloride to hydrolyze to obtain 4-chloro-2-trifluoroacetyl aniline hydrochloride in an acidic condition; and then carrying out alkalization to obtain 4-chloro-2-trifluoroacetyl aniline, carrying out reaction with cyclopropyl acetylene magnesium chloride in a catalytic system formed by a ligand (1R, 2S)-1-phenyl-2-(1-pyrrolidyl)-1-propyl alcohol, and carrying out an asymmetrical self-catalytic reaction to obtain the efavirenz key intermediate. The synthetic method of the efavirenz key intermediate, provided by the invention, is cheap and easily available in raw material, low in toxicity of reagent and mild in reaction condition, amino protection and deprotection are not carried out frequently, the line is concise, the yields of reaction of each step are excellent, and the total yield is high.

The invention relates to a simple synthesizing method of 2-pyridine methyl sulfide and related drugs. The method is characterized in that 2-methyl pyridine n-oxide is used as the raw material and pyridine n-oxide or dichloromethane is used as the solvent to have reaction with trifluoroacetic anhydride to obtain a trifluoroacetate intermediate, purification is not needed, the trifluoroacetate intermediate is allowed to have reaction with thiophenol under the catalysis of lithium bromide or tetrabutyl ammonium bromide and by using toluene or ethyl acetate as the solvent to generate the 2-pyridine methyl sulfide. The method is simple to operate, cheap in reagents, easy in reagent obtaining, mild in reaction conditions, wide in substrate applicability, good in position selectivity, high in yield and the like. In addition, the method is successfully applied to the synthesizing of omeprazole sulfide and rabeprazole sulfide, and the synthesizing method does not need catalysts.

The invention relates to the technical field of preparation methods of carboxylic acid amide, in particular to the technical field of preparation methods of agomelatine and an intermediate thereof. The invention particularly relates to an intermediate of agomelatine and a relevant preparation method. The preparation method comprises the following steps of: undergoing an alkylation reaction on 1-halogen-7-naphthalene alkoxyl serving as a raw material to obtain a compound shown as a formula (2); undergoing a Grignard reaction on the obtained compound shown as the formula (2) to obtain a compound shown as a formula (3); reacting the obtained compound shown as the formula (3) with trifluoroacetic anhydride to obtain a compound shown as a formula (4), wherein the compound shown as the formula (4) is a novel intermediate compound for synthesizing agomelatine and a derivative thereof; reacting the compound shown as the formula (4) with sodium azide simultaneously to obtain a compound shown as a formula (5), wherein the compound shown as the formula (5) is a novel intermediate compound for synthesizing agomelatine and a derivative thereof; and undergoing simple type reactions such as hydrogenation reduction, electrophilic substitution and the like on the compound shown as the formula (5) to obtain agomelatine suitable for process production and a derivative thereof, wherein R1 is alkyl; and X is F, Cl, Br or I.

The invention relates to the field of organic synthesis, and discloses a method for synthesizing a pyrazolo[1,5-a]pyridine-3-carboxylate derivative. The method comprises the following step: 1) 2-pyridine acetate or substitute 2-pyridine acetate and N,N-dimethylformamide dimethyl acetal are subjected to a reaction; 2) hydroxylamine hydrochloride is continuously added for a reaction to obtain a compound III; and 3) the compound III and trifluoroactic anhydride are subjected to the reaction to generate the product. After the reaction is completed, water is added, and the pH value is adjusted to neutrality, extraction is carried out and the organic phases are merged, and then the steps of drying, concentration and re-crystallization are carried out. The synthetic method has the advantages of easy acquisition of the raw materials, mild reaction condition and high yield; whether the raw materials have a symmetrical structure or not, the target product can be specifically obtained, post-treatment and purifying are easily operated, and amplification production can be realized.

The invention provides a synthesis method of 3-bromo-6-chloropyridyl-2-formic acid, which comprises the following steps: by using 3-bromo-6-chloropyridine as an initial raw material, carrying out oxidation reaction with urea peroxide and trifluoroacetic anhydride to obtain 3-bromo-6-chloropyridine oxynitride; reacting with trimethylsilyl cyanide and triethylamine to obtain 3-bromo-6-chloropyridyl-2-cyanide; and finally, hydrolyzing in sulfuric acid to obtain the 3-bromo-6-chloropyridyl-2-formic acid. The synthesis method provided by the invention has the advantages of high operational safety, environment friendliness and the like; and especially, the synthesis method uses low-cost low-toxicity raw materials in stead of such expensive raw material as 2-fluoro-3-bromo-6-chloropyridine and virulent raw material sodium cyanide, and is suitable for large-scale industrial production.

The invention discloses a one-pot method used for synthesis of diaryl methyl ketal. The on-pot method is shorter in process, and is more effective. A novel synthesis strategy is provided for synthesisof some complex diaryl ketones. According to the one-pot method, an aryl carboxylic acid and a R-substituted benzene compound are selected, in the presence of trifluoroactic anhydride, boron trifluoride diethyl etherate is taken as a catalyst, direct acylation reaction is carried out, without treatment, methanol and trimethyl orthoformate are added for continuous reaction so as to obtain a diarylmethyl ketal product, so that one-pot synthesis of diaryl methyl ketal from aromatic acids is realized.

A process for the production of tertiary amines by reductive amination of carbonyl compounds with secondary amines in the presence of a water scavenger, preferably trifluoroacetic acid anhydride, is disclosed. This process has applications in the preparation of imidazole-containing benzodiazepines, which are inhibitors of farnesyl protein transferase.