158results about How to "Starting materials are cheap and readily available" patented technology

The invention relates to a method for synthesizing chiral beta-acetenyl ketone by catalytic intermolecular decarboxylation from beta-ketonic acid and a propargyl compound. A chiral copper catalyst adopted in the invention is synthesized in stiu from a copper salt and a chiral P,N,N-tridentate ligand in various polar solvents and nonpolar solvents. According to the invention, various chiral beta-acetenyl ketone compounds with substituent groups can be synthesized conveniently, and can obtain a percent enantiomeric excess as high as 95%. The method in the invention is advantaged by operational simplicity, available raw materials, wide substrate application range, high enantioselectivity, and the like.

The invention discloses a method for preparing medetomidine. Medetomidine can be effectively prepared according to the method for preparing medetomidine, and by adopting a cheap 4-imidazole derivative and cheap 1-(2,3-dimethylphenyl)ethanone as raw materials, the medetomidine product is prepared only through three-step reactions. The method has simple process conditions, is easy to control, and is conducive to industrialized mass production; and the yield of medetomidine prepared by the method for preparing medetomidine can reach 76%, and the product purity can reach 99.5%.

The invention discloses a preparation method of a 2-trifluoromethyl substituted quinazolinone compound. The preparation method comprises the following steps: adding ferric trichloride, sodium hydrogen, a molecular sieve, trifluoroethyleneimide chloride and isatin into an organic solvent, reacting at the temperature of 40 DEG C for 10 hours, heating to 120 DEG C, reacting for 20 hours, and after the reaction is completed, carrying out post-treatment to obtain the 2-trifluoromethyl substituted quinazolinone compound. The preparation method is simple and convenient to operate, cheap and easily available in initial raw materials and catalysts, high in reaction efficiency and wide in substrate compatibility range, diversified substituted quinazolinone compounds with trifluoromethyl can be synthesized through substrate design, and the practicability of the method is widened while operation is facilitated.

The invention relates to the field of organic synthesis, and relates to a method for preparing chiral 4,5-dihydropyrazole compounds. The invention relates to a method for synthesizing the chiral 4,5-dihydropyrazole compounds through a catalyzed asymmetric [2+3] cycloaddition reaction of a hydrazine compound and a propargyl compound. An adopted chiral copper catalyst is prepared through an in-situ reaction of copper salt and a chiral tridentate P,N,N-ligand in various polar and non-polar solvents. With the method, various chiral 4,5-dihydropyrazole compounds with substituent groups can be conveniently synthesized. The percent enantiomer excess is up to 96%. The method has the characteristics of simple operation, easy-to-obtain raw materials, wide substrate application range, high enantioselectively, and the like.

The invention relates to a preparation method for 3-fluorophthalic acid. The preparation method comprises the following steps that: (I) 2,6-difluorobenzonitrile which is used as a starting material is subjected to an ammoximation reaction in an aprotic solvent to obtain 2-amino,6 -fluorobenzonitrile; (II) the 2-amino,6 -fluorobenzonitrile is subjected to a diazotization reaction and then reacts with liquid HBr to form 2- bromo,6 -fluorobenzonitrile; (III) the 2- bromo,6 -fluorobenzonitrile is subjected to a cyanation reaction in an aprotic solvent to form 3-fluorophthalic benzenedicarbonitrile; (IV) the 3-fluorophthalic benzenedicarbonitrile is decomposed in an aqueous solution of inorganic acid to obtain a target substance. The preparation method overcomes the defects of difficult preparation of raw materials, low yield of the target substance, long preparation time or/and low purity and so on in the prior art of preparing the 3-fluorophthalic acid and is capable of meeting commercial preparation requirements.

The invention relates to a preparation method of high-purity obeticholic acid. A compound chenodeoxycholic acid (CDCA) shown as a formula II is used as a starting raw material and subjected to oxidation, esterification, hydroxy protection, ethylidene formation, catalytic hydrogenation, carbonyl reduction and esterolysis reaction to obtain the high-purity obeticholic acid. The preparation method of the high-purity obeticholic acid, provided by the invention, has the advantages of low toxicity, low pollution, high purity, good stereoselectivity, low content of impurities, mild reaction conditions, high safety, simplicity and convenience in production operation and the like, and is suitable for industrial production.

The invention relates to a preparation method of a steroid drug intermediate, and concretely relates to a preparation method of a betamethasone intermediate which is 16beta-methyl-17alpha-hydroxypregna-4,9-diene-3,20-dione. The method comprises the following steps: carrying out a cyanidation reaction on 9alpha-hydroxy-4-ene-pregna-3,17-dione, carrying out a ketal protection reaction, carrying out a double elimination reaction, carrying out an epoxy reaction, and carrying out a Grignard addition hydrolysis reaction to prepare the target product. The method is a brand preparation technology for producing the betamethasone intermediate, and has the characteristics of cheap and easily available initial raw material, simple operations of all above reactions, high yield, suitableness for industrial massive production, and realization of the yield and the quality reaching satisfactory levels.

The invention relates to the field of pharmacy, in particular to a method for efficiently synthesizing an elagolix intermediate. The method takes 6-methyluracil as a starting material, and comprises five reactions of aminoalkylation, halogenation, coupling, benzyl halide substitution and deprotection. The synthetic method has the advantages that the starting material is cheap and easy to obtain, areaction reagent is friendly to the environment, the reaction steps are simple, the aftertreatment is convenient, the overall yield is higher, and the method is especially suitable for industrial mass production and has larger application value.

The invention relates to a preparation method of 1-(mercaptomethyl)cyclopropyl acetic acid (I). The preparation method comprises the steps of carrying out ring opening on cyclopropanedimethanol cyclic sulfite (V) with potassium thioacetate, so that a compound (IV) is obtained; carrying out sulfonic acid esterification reaction on the compound (IV) and methanesulfonyl chloride or paratoluensulfonyl chloride to obtain a compound (III); carrying out cyano group substitution on the compound (III) to obtain a compound (II); and hydrolyzing the compound (II) under an alkaline condition so as to obtain the 1-(mercaptomethyl)cyclopropyl acetic acid (I), wherein R is a methyl or a p-methylphenyl. The invention further provides a preparation method of an 1-(mercaptomethyl)cyclopropyl acetic acid intermediate. The preparation methods of the 1-(mercaptomethyl)cyclopropyl acetic acid and the 1-(mercaptomethyl)cyclopropyl acetic acid intermediate are ingenious in design, initial raw materials are low in cost and easily available, and the technological process is simple and practicable, so that the production cost can be greatly reduced; the preparation methods are beneficial to industrial production and suitable for large-scale popularization and application.

The invention discloses a method for preparing emtricitabine. The method comprises the following steps: refining so as to obtain 5S-(5'-flucytosine-1')-1,3-oxythiacyclopentane-2-carbethoxy-(1'R,2'S,3'R)-menthyl lactate; under a weak alkali and solvent condition, removing a chiral aid L-menthol, thereby obtaining a product of emtricitabine. The initial raw material used in the method is low in price, easy to obtain, mild in reaction condition, high in atom utilization rate and simple and convenient in operation process, the reagent is environmentally friendly, the obtained product is high in chemical purity, meets medicine standards, and is applicable to industrial production of emtricitabine.

The invention provides a phosphaphenanthrene compound and a preparation method and application thereof. The compound is a compound shown in the formula I or a stereisomer, a geometrical isomer, a tautomer, a hydrate, a solvate, ester and pharmacologically acceptable salt of the compound shown in the formula I, wherein R, X and Y are as defined as in the instruction book. The compound has the goodsynergistic flame retardation effect, can be served as a fire retardant, is suitable for flame retardation in high polymer materials, and is particularly suitable for preparing the high polymer materials such as epoxy resin with the flame retardation property. The formula I is shown in the description.

The invention relates to a preparation method for organosilicone ring bodies. The method comprises that the organosilicone ring bodies are obtained via synthesis and purification processes of synthesis, hydrolysis, pyrolysis and distillation after Grignard reaction of chlorobenzene (bromobenzene). The method has the advantages of readily available and low-price raw materials, stable technology, high security and no environmental pollution, short reaction steps and low cost, and is suitable for industrial production.

The invention belongs to the technical field of chemical synthesis of N-heterocycle-containing drug intermediates, and particularly relates to a synthesis method of tert-butyl 4,7-diazaspiro[2.5]octyl-7-formate. By using diethyl malonate as a raw material, cyclization reaction, Hofmann reaction, hydrolysis reaction, acylation reaction for recyclization, reduction reaction and the like are performed to conveniently synthesize the target compound product. The method has the advantages of simple synthesis technique, cheap and accessible raw materials, mild reaction conditions, high controllability, low cost and high yield, and is convenient to operate.

The invention relates to a synthesis process of methoxsalen. In the process, pyrogallol is used as an initial raw material, and the methoxsalen is prepared by carrying out six-step reaction on the pyrogallol, wherein the total yield is 29%. The synthesis process has the advantages of short synthesis path, simple method, readily-available raw materials and suitability for industrial production.

The invention provides a synthesis method of chiral benzocyclic beta-ketoester compounds, and the compounds are benzocyclic beta-ketoester compounds containing the chiral quaternary carbon center at 2-position. The synthesis method is as follows: in the presence of an alkali additive, a chiral copper catalyst catalyzes an asymmetric propynyl substitution reaction of benzocyclic beta-ketoester compounds and acetylene propyl compounds in a reaction medium to synthesize the benzocyclic beta-ketoester compounds containing the chiral quaternary carbon center at 2-position. The chiral copper catalyst is prepared in situ from copper salts and chiral P, N, N-tridentate ligands in various polar and nonpolar solvents. The method can conveniently synthesize various functionalized benzocyclic beta-ketoester compounds containing the chiral quaternary carbon center at 2-position, and the enantiomer excess percentage is up to 95%. The method has the characteristics of simple operation, easy availability of raw materials, wide application range of substrates, high enantioselectivity and the like.

The invention discloses a one-pot method for preparing a crucial intermediate in oseltamivirphosphate synthesizing reaction. The method is characterized in that: 1,3-butadiene and ethyl propiolic acid ethyl ester are adopted as raw materials, alcohol and isocyanate/salt are adopted as main reactants, DBU is adopted as a catalyst, and no separation process is required before a finished product is obtained, such that the one-pot method is realized. The method mainly comprises steps that: 1, 1,3-butadiene is cooled to a temperature of -78 DEG C; ethyl propiolic acid ethyl ester and hydroquinone are added to 1,3-butadiene, and the mixture is stirred for 3 days under a temperature of 110 DEG C; the mixture is subject to vacuum distillation, such that 1-ethyl formate-1,4-diene cyclohexane is obtained; 2, I2 is added to a solution of 1-ethyl formate-1,4-diene cyclohexane and AgOCN; the mixture is heated to a temperature of 35-40 DEG C within 4 hours, such that a mixture A is obtained; alcohol and waterless HCl are added to the mixture A, and the mixture is stirred for 6-8 hours under a temperature of 35-40 DEG C, such that a mixture B is obtained; DBU is added to the mixture B, and the mixture is subject to a reaction over night under a temperature of 35-40 DEG C; the mixture is purified, such that the finished product is obtained; or DBU is added to the mixture A, the mixture is subject to a reaction over night under a temperature of 35-40 DEG C, and the mixture is purified, such that the finished product is obtained. Compared to existing technologies, the method is substantially advantaged in that: initial raw materials are cheap and easy to obtain, the reaction route is short, the synthesis period is shortened, the reaction method is improved into a one-pot method, the separation and purification processes are simple, the yield is high, the reaction efficiency is high, and the method has certain potential to be used in large-scaled productions.

The invention discloses a novel synthesis method of a ticagrelor intermediate (1R,2R)-2-(3,4-difluorophenyl) cyclopropane nitrile. The novel synthesis method comprises the following steps: firstly, carrying out amination reaction on a glucose molecule chiral auxiliary reagent and (2E)-3-(3,4-diflurophenyl) acryloyl chloride; secondly, carrying out cyclopropanation reaction on a reactant and a sulfur ylide reagent to obtain a N-glucosyl (1R,2R)-2-(3,4-diflurophenyl) cyclopropanecarboxamide; thirdly, carrying out beta-N-glycosylation reaction on the N-glucosyl(1R,2R)-2-(3,4-diflurophenyl) cyclopropanecarboxamide under the action of PPh3, CBr4, AgOTf and NH3 water. The novel method has the characteristics of shorter process route, low-priced and easily-obtained starting materials, high yield, good stereoselectivity, good enantioselectivity and the like; the production cost is reduced to a great extent and better benefits in economy are obtained.

The invention discloses a canagliflozin drug impurity as well as a preparation method and application thereof. The invention provides a compound as well as a preparation method and application thereof. The method comprises the following steps: (1) enabling the compound as shown in formula 2 to be in contact with an alkaline lithium hydroxide aqueous solution to obtain a coarse product containing a compound as shown in formula 3, wherein the coarse product contains a compound as shown in formula 1; (2) crystallizing and filtering the coarse product to obtain mother liquor; (3) concentrating the mother liquor to obtain residues; and (4) crystallizing and filtering the residues in an L-proline-containing organic solvent, thus obtaining the compound as shown in formula 1. The method provided by the invention can realize directed preparation of the compound as shown in formula 1, and a reliable impurity contrast is provided for quality research on industrially produced canagliflozin-series diabetes treatment drug products and quantitative control over impurities.

The invention discloses a preparation method of pyridodipyrimidine and pyridodipyrazole derivatives. The method comprises the following steps: carrying out a contact reaction on substituted methylquinoline derivatives, 6-amino-1,3-dimethylpyrimidine-2,4-dione or 3-methyl-1-phenyl-5-aminopyrazole and an iodine elementary substance to synthesize pyridodipyrimidine compounds, pyridodipyrazole compounds and derivatives thereof in one-pot. According to the preparation method, the adopted raw materials are cheap and easy to obtain, the preparation method is simple, steps are relatively short, the yield is up to 97%, and a feasible method is provided for industrially preparing the compounds.