15 results about "Triethyl orthoformate" patented technology

This application relates to a UV-3 ultraviolet absorber and its preparation method, belonging to the field of chemical synthesis technology. The preparation method employs a one-pot process, in which benzocaine reacts with triethyl orthoformate in xylene solvent. This step utilizes reactive distillation coupling control, continuously removing the generated alcohol distillate through a distillation separation device to promote reaction equilibrium shift, obtaining a xylene solution of the intermediate NET. Subsequently, the solution is heated to a reaction temperature of 135–145°C, and benzyl chloride is added dropwise for N-alkylation, while a tail gas absorption device absorbs byproduct gases. The reaction slurry is then cooled for crystallization, solid-liquid separation, and drying to obtain the UV-3 product. This invention simplifies the production process through a one-pot process, avoids the use of toxic DMF solvent, and solves the technical problem of raw material residues leading to subsequent side reactions in the one-pot process through reactive distillation coupling control, resulting in a final product with high purity and high yield.

This invention proposes a method for preparing dehydroepiandrosterone (DHEA), comprising the following steps: S1, dissolving 4-androstenedione in acetic anhydride to obtain a first material, which is then pumped separately into an acetylation microchannel reactor with quaternized GO-phosphotungstic acid catalyst supported on the inner wall for reaction with acetyl chloride; S2, mixing triethyl orthoformate with anhydrous ethanol to obtain a second material, which is then pumped separately into a ketal microchannel reactor with niobium oxide / γ-CD-phosphotungstic acid catalyst supported on the inner wall of the ketal microchannel reactor; S3, dehydrating the effluent from step S2 and adjusting the pH to 7-8, then pumping separately into a reduction microchannel reactor with an ethanol solution containing sodium borohydride for reduction reaction; S4, adding hydrochloric acid to the effluent from step S3 and adjusting the pH to 2-3 to obtain a hydrolysate; evaporating the solvent from the hydrolysate, filtering and drying to obtain DHEA. The supported heteropolyacid composite membrane used in this invention exhibits high catalytic efficiency, high yield, and excellent quality.

The invention relates to a preparation method of medroxyprogesterone acetate. The preparation method of medroxyprogesterone acetate comprises the following steps: mixing 17alpha-hydroxyprogesterone with glacial acetic acid, acetic anhydride and a first catalyst for first reaction to prepare an intermediate 1; mixing the intermediate 1 with tetrahydrofuran, ethanol, triethyl orthoformate and a second catalyst to carry out a second reaction, then adding formaldehyde and N-methylaniline to carry out a third reaction, then adding hydrochloric acid and water to carry out a fourth reaction, and collecting a crude product of an intermediate 2; and preparing the medroxyprogesterone acetate through a series of refining steps. According to the preparation method, the dosage of the palladium-carbon catalyst is small, the cost can be obviously reduced, and the product is lower in impurity content and higher in purity.

The utility model discloses a reactor for preparing triethyl orthoformate through alcoholysis reaction. Comprising a bottom plate, a tank body fixedly connected to the upper end of the bottom plate, a feeding unit arranged at the upper end of the tank body, an air inlet unit arranged on the side wall of the tank body, a discharging unit arranged on the lower portion of the side wall of the tank body, a mixing mechanism arranged at the upper end of the bottom plate, a second fixing box arranged on the lower portion of the inner wall of the tank body and a vertical cylinder fixedly connected to the upper end of the second fixing box. The hopper body is fixedly connected to the upper end of the vertical cylinder, the inner tank is fixedly connected to the inner wall of the second fixing box, the second through hole is formed in the lower end of the inner tank in a penetrating mode, the vertical pipes are fixedly connected to the upper end of the inner tank, and the third through holes are formed in the peripheral walls of the vertical pipes in a penetrating mode. The device has the advantages that the gas-liquid mass transfer can be efficiently enhanced, the removal of light components is promoted, the semi-continuous efficient reaction is realized, and the catalyst is convenient to recycle.

The invention discloses a synthesis method of a diene liquid crystal monomer, which comprises the following steps: S1, Grignard addition reaction: carrying out Grignard addition reaction on substituted cyclohexyl N-methoxy-N-methyl benzamide and a substituted cyclohexyl methyl chloride Grignard reagent to obtain a ketone intermediate; s2, the ketone intermediate sequentially reacts with 5, 5-dibromobarbituric acid for a bromination reaction, then sodium formate is added into an alcohol solvent for a hydroxylation reaction, then sodium borohydride is added for a reduction reaction, and a vicinal diol intermediate is obtained; and S3, carrying out an orthoformate reaction on the vicinal diol intermediate obtained in the step S2 and triethyl orthoformate in a fluorine-containing alcohol solvent, then heating to reflux, and carrying out an elimination reaction to obtain the target diene liquid crystal monomer. According to the invention, a traditional double bond construction strategy of multiple Wittig reactions is abandoned, a new synthesis route which takes the Grignard reaction as a starting point and finally constructs a diene structure by a one-pot method through a low-temperature orthoformate / elimination reaction carried out in a specific fluorine-containing solvent is designed, the route is simple, the total yield is high, and the overall cost is lower.

The invention discloses a preparation method of a drug intermediate 8-(2-benzamido) sodium caprylate, which comprises the following steps: in the presence of a solvent A or a catalyst, reacting salicylamide with triethyl orthoformate to obtain a compound I-1; (2) in the presence of alkali and a solvent B, carrying out substitution reaction on the compound I-1 and 8-bromocaprylic acid tert-butyl ester to obtain a compound I-2; (3) in the presence of an acid and a solvent C, carrying out a deprotection reaction on the compound I-2 to obtain a compound I-3; and (4) in the presence of a solvent D, reacting the compound I-3 with alkali salt of sodium to obtain the compound I. The method provided by the invention has the advantages of high yield, high selectivity, low production cost, few byproducts, easiness in industrial production and environmental friendliness.

The invention provides a preparation method of fenerenone and an intermediate thereof. The invention discloses a preparation method of a fenerenone intermediate 5, which comprises the following steps: step 1, in an organic solvent, carrying out resolution reaction on a fenerenone intermediate 2 and D-diphenyl tartrate to obtain a resolution salt, and then carrying out acid-base reaction on the resolution salt and alkali to obtain a fenerenone intermediate 3; 2, in an organic solvent, in the presence of acid, carrying out nucleophilic substitution reaction on the fenerenone intermediate 3 and triethyl orthoformate to obtain a fenerenone intermediate 4; and step 3, in a solvent, carrying out a hydrolysis reaction on the fenerenone intermediate 4 to obtain the fenerenone intermediate 5. The preparation method provided by the invention has the advantages of short reaction steps, high reaction total yield, simple and safe operation, simple post-treatment steps, high purity of the prepared product, low production cost and suitability for industrial production.

The utility model discloses a distillation and purification device for triethyl orthoformate. Comprising a bottom plate, a bearing block fixedly connected to the upper end of the bottom plate, a distillation still fixedly connected to the upper end of the bearing block, a groove body formed in the peripheral wall of the distillation still in a penetrating mode, a sliding door hinged to the inner wall of the groove body, a feeding assembly arranged on the peripheral wall of the distillation still, a steam output assembly arranged at the upper end of the distillation still and a discharging assembly arranged at the lower end of the distillation still. The first bearing ring is fixedly connected to the middle part of the inner wall of the distillation kettle; the movable ring is placed at the upper end of the first bearing ring; the fixed cylinder is arranged on the inner wall of the movable ring in a sliding manner; the separation cylinder is fixedly connected to the lower end of the movable ring; the guide cylinder is fixedly connected to the upper end of the fixed cylinder; the air guide assembly is arranged at the upper part of the inner wall of the distillation kettle. The utility model has the advantages that the internal airflow can be actively guided and adjusted, the mass and heat transfer efficiency is high, and the cleaning and maintenance are convenient.

The application belongs to the technical field of medicine synthesis, and particularly relates to a gemigim intermediate compound and a preparation method thereof. The gemigim new intermediate compound is obtained by reacting alpha-cyanoacetamide, triethyl orthoacetate and triethyl orthoformate as starting materials. The new intermediate is cyclized to obtain a gemigim key intermediate compound 3-cyano-4-methoxy-2(1H)-pyridinone. The new intermediate synthesis method provided by the application is simple, triethyl orthoformate is used as a 'one-carbon unit' donor, the reagent only produces ethanol in the cyclization process, the use of DMF-DMA can be effectively avoided, and then the generation of dimethylamine gas or its acetate salt is avoided, so that the reaction operation is safer and more environmentally friendly.

The invention relates to the technical field of pharmaceutical chemicals, in particular to a preparation process of hydrocortisone acetate. The preparation process comprises the following steps: carbonyl protection reaction: sequentially adding ethylene glycol, triethyl orthoformate and a compound 1 into a reaction flask, then adding p-toluenesulfonic acid, adding water for crystallization, filtering and drying to obtain a compound 2; a reduction hydrolysis reaction; and a replacement reaction: adding the compound 3 into the reaction solvent, adding potassium acetate, carrying out a heating reaction, after the reaction is completed, cooling, adding water for crystallization, filtering to obtain a crude product of hydrocortisone acetate, dissolving with dichloromethane and water for desalting, washing with water for layering, concentrating to be dry, crystallizing with an alcohol solvent, and discharging to obtain a refined product of hydrocortisone acetate. According to the present invention, the method has characteristics of simple and convenient operation, high product yield, and high purity, and the method of cooling after the reaction, adding water, precipitating, filtering, removing most of the impurities, dissolving to remove the salt, and carrying out alcohol refining and discharging is provided, such that the method has characteristics of simple and convenient operation, and the obtained product has characteristics of high yield and high purity.

The invention discloses a synthesis method of a flurobixafen metabolite. The synthesis method comprises the following steps: carrying out condensation reaction on ethyl difluoroacetoacetate and triethyl orthoformate to prepare an intermediate A; carrying out cyclization reaction on the intermediate A and hydrazine hydrate to generate an intermediate B; carrying out N-benzylation reaction on the intermediate B and a methoxybenzyl derivative to obtain an intermediate C; performing hydrolysis and acidification reaction on the intermediate C to obtain an intermediate D; reacting the intermediate D with thionyl chloride or oxalyl chloride to obtain an intermediate E; reacting the intermediate E with 2-(3, 4-dichlorophenyl)-4-fluoroaniline to obtain an intermediate F; and carrying out N-benzyl removal reaction on the intermediate F to obtain the flurobixafen metabolite. The method has the advantages of cheap raw materials, mild reaction conditions, simplicity in operation, environmental friendliness, no need of special and expensive catalysts, high yield and the like, and is suitable for industrial production.

This invention relates to the field of refrigerants, specifically to a mixed refrigerant and its preparation method. By weight, the refrigerant comprises 85-95 parts of a basic refrigerant, 1-5 parts of a flame retardant, 1-10 parts of a lubricating oil, and 0.1-0.5 parts of a stabilizer. The basic refrigerant is a mixture of R32, R1234ze(E), and R1234yf in a mass ratio of (18-28):(45-60):(15-25). The stabilizer is a mixture of triethyl orthoformate, triphenyl phosphite, and methylbenzotriazole in a mass ratio of (0.1-0.15):(0.1-0.15):(0.15-0.2). This refrigerant has a low GWP, good flame retardant properties, and good stability.

This invention discloses a method for preparing phenelzine, comprising the following steps: dissolving compounds of formula 1 and formula 2 in a solvent, adding piperidine and acetic acid, and performing carbon-carbon coupling to synthesize compound 3; dissolving compounds of formula 3 and formula 4 in a solvent, performing cyclization to synthesize compound 5; dissolving compound 5 in a solvent, adding triethyl orthoformate, and performing alkylation under acid catalysis to synthesize compound 6; dissolving compound 6 in a solvent, adding DDQ to synthesize compound 7; dissolving compound 7 in a solvent, and hydrolyzing it with NaOH to synthesize compound 8; dissolving compound 8 in a solvent, and performing amination under the action of CDI and hexamethyldisilazane to synthesize compound 9; dissolving compound 9 in a solvent, and performing reduction resolution under the action of catalysts A and B to synthesize phenelzine of formula 10. The method for preparing phenelzine of this invention has advantages such as high chiral selectivity, no need for column chromatography separation, high yield, and low cost.

The invention discloses 3D printing photosensitive resin capable of improving storage stability and a preparation method. The 3D printing photosensitive resin capable of improving storage stability is prepared from the following components in parts by weight: acrylate oligomer, acrylate monomer, polyvinyl alcohol silicate, photoinitiator, antioxidant, triethyl orthoformate, baking soda and pigment. When the photosensitive resin is exposed in air and absorbs water vapor, the triethyl orthoformate is in contact with water to generate hydrolysis reaction, and ethyl formate and ethanol are generated; ethyl formate and baking soda are subjected to a neutralization reaction, acidity is reduced, and ethyl formate is prevented from further generating acetate and ethyl alcohol; and the generated ethanol increases the wettability and eliminates bubbles at the same time. The method has the beneficial effects that water in the photosensitive resin can react with triethyl orthoformate to generate ethanol, so that the water is eliminated, the flocculation phenomenon can be reduced, and part of bubbles can be eliminated; meanwhile, the amount of generated ethanol can be controlled by adjusting the acidity and alkalinity through baking soda.

The invention belongs to the technical field of coating preparation, and discloses an automobile paint prepared from modified carbon black, wherein a component A is prepared from unsaturated polyester resin emulsion, water-based acrylic resin, water-based polyurethane dispersion, a dispersing agent, modified carbon black, a coalescing agent, a wetting agent, 0.3 part by weight of flatting agent and a defoaming agent according to a proportion; the component B is prepared from ethyl 3-ethoxypropionate, triethyl orthoformate and water dispersible polyisocyanate according to a proportion; the modified carbon black is obtained by sequentially carrying out polymer grafting and wax packaging treatment. According to the invention, the carbon black is modified and applied to the preparation of the water-based automobile paint, so that the weather resistance, hardness and wear resistance of the product can be remarkably improved.