96 results about "Dimethylformamide-dimethylacetal" patented technology

The present invention provides a production method of 5-aminopyrimidine compound represented by the formula (5) by reacting a glycine compound represented by the formula (1) with t-butoxybisdimethylaminomethane, dimethylformamidedimethylacetal or dimethylformamidediethylacetal to produce a dialkylaminomethylene compound represented by the formula (2), reacting the compound of formula (2) in the presence of an acid to produce a hydroxymethylene compound represented by the formula (3), and reacting the compound of formula (3) with an amidine compound represented by the formula (4) or a salt thereof.

The invention discloses a preparation method of gefitinib. The preparation method takes 4-methoxyl-5-(3-morpholine propoxyl)-2-nitrobenzonitrile as a raw material, then subjecting the raw material to treatments of reduction and salt forming reactions so as to obtain an intermediate 2-amino-4-methoxyl-5-(3-morpholine propoxyl) benzonitrile hydrochloride, then directly subjecting the intermediate to react with N,N-dimethyl formamide dimethyl acetal so as to obtain N'-(2-cyano-5-methoxyl-4-(3-morpholinyl propoxyl)benzyl)-N,N-dimethyl formamidine, and finally subjecting the formamidine intermediate to carry out rearrangement reactions with 3-chloro-4-fluoroaniline so as to obtain the gefitinib. The preparation method has the advantages of mild reaction conditions, convenient intermediate purification method, and suitability for industrial production.

The invention relates to a synthetic process of 5-bromo-7-azaindole which is an important medical intermediate. The synthetic process comprises the steps of generating 2-nitro-3-methyl-5-bromopyridine from 2-amino-3-methyl-5-bromopyridine by virtue of the oxidation of caro acid, and generating an intermediate 3 under the actions of tetrahydropyrrole and N,N-dimethylformamide dimethyl acetal (DMF-DMA), and finally carrying out reduction and loop closing under the action of a raney nickel/85% hydrazine hydrate system or other low valence metal so as to generate 5-bromo-7-azaindole. The synthetic process is suitable for industrial production and has the advantages that the raw material cost is low, initial raw materials are easily available, and the operation is easy.

The present invention provides a preparation method of lapatinib. The method comprises contacting a compound shown as a formula 1 with a compound shown as a formula 2 to produce a compound shown as a formula 3; reducing the compound shown as the formula 3 to produce a compound shown as a formula 4; contacting a compound shown as a formula 5 with N,N-dimethylformamide dimethyl acetal to produce a compound shown as a formula 6; contacting the compound shown as the formula 6 with the compound shown as the formula 4 to produce a compound shown as a formula 7; in the presence of an acid, an alkali and NaNH(OAc)3, contacting a compound shown as a formula 8 with a compound shown as a formula 9 to produce a compound shown as a formula 10; in the presence of a catalyst and an alkali, contacting the compound shown as the formula 10 with a compound shown as a formula 11 to produce a transition intermediate, and contacting the transition intermediate with the compound shown as the formula 7 and p-toluenesulfonic acid to produce a compound shown as a formula I; through use of the method, the lapatinib can be effectively prepared.

The invention relates to preparation for a medicinal intermediate 6-chloro-5-fluroindole for synthesizing an anti-cancer medicament, which comprises the following steps that: firstly, 3-fluro-4-aminotoluene reacts in a concentrated sulfuric acid system, the pH value is adjusted to be neutral after the reaction, and the mixture is filtered to obtain 3-fluro-4-amino-6-nitrotoluene; secondly, a sodium nitrite solution and cuprous chloride are added in the concentrated sulfuric acid system, and the mixture is diluted by clear water to obtain 3-fluro-4-chloro-6-nitrotoluene; thirdly, the 3-fluro-4-chloro-6-nitrotoluene and N, N-dimethyl formamide dimethylacetal react in a molecular sieve drying DMF system to obtain 2-(methylamino) ethylene-4-fluro-5-chloronitrobenzene; and finally, iron powder is added into an acetic acid system, and after the reaction, the mixture is recrystallized by using a mixed system containing petroleum ether to obtain the white 6-chloro-5-fluroindole. The method has the advantages of simple operation, environmental friendliness, high purity and low cost, and is suitable for industrialized production.

The present invention provides a novel process for the preparation of acyclic phosphonate nucleotide analogs using novel intermediates. Thus, for example, (R)-9-(2-phosphonomethoxypropyl)adenine is reacted with dimethylformamide dimethylacetal to give N⁴-dimethylaminomethyledino-9-(2-phosphonomethoxy ethyl) adenine, which is then reacted with chloromethyl-2-propyl carbonate in presence of triethylamine to give (R)—N⁴-Dimethylaminomethyledino-9-(2-phosphono methoxypropyl) adenine disoproxil, followed by deprotection with acetic acid to get tenofovir disoproxil. Tenofovir disoproxil is then treated with fumaric acid to give tenofovir disoproxil fumarate.

The invention discloses a method for preparing Afatinib (I). The method comprises the following steps: 2-cyano-4-[4-(N,N-dimethylamino)-1-oxo-2-buten-1-yl]amino-5-[(S)-(tetrahydrofuran-3-yl)oxy]aniline (II) and N,N-dimethylformamide dimethylacetal (DMF-DMA) are subjected to condensation reaction so as to produce an intermediate (III), and the intermediate (III), without to the need of separation, is directly subjected to cyclization reaction with 4-fluoro-3-chloroaniline so as to prepare Afatinib (I). According to the method, the steps for preparing Afatinib are reduced obviously, and the cost is reduced greatly.

The invention relates to a method for synthesizing an important intermediate 2-chloro-3-amino-4-methylpyridine for an anti-AIDS medicament Nevirapine, and belongs to the technical field of organic synthesis. The method comprises the following process steps that: ethyl cyanoacetate and acetone are dehydrated and condensed to generate a condensation compound I under the action of a catalyst; dimethyl formamide, dimethyl sulfate and sodium methoxide solution react to generate N,N-dimethylformamiade dimethyl acetal (N,N-dimethyl formamide A), and then the N,N-dimethylformamiade dimethyl acetal reacts with the condensation compound I to generate conjugated enamine, namely a condensation compound II; the condensation compound II is cyclized by hydrochloric acid and ethanol to form a cyclic compound 2-chloro-4-methyl-ethyl nicotinate; the 2-chloro-4-methyl-ethyl nicotinate is ammonolyzed by ammonia gas to form 2-chloro-4-methyl-niacinamide; and the 2-chloro-4-methyl-niacinamide is subjected to Hofmann degradation reaction to form the 2-chloro-3-amino-4-methylpyridine. Compared with the prior synthesizing method, the method of the invention has the remarkable characteristic of reducing the reaction steps, and is suitable for large-scale industrialized production; the molar total yield of the five-step reaction is improved to 27 percent from the prior 24 percent; and the purity of the product reaches over 99 percent.

The invention discloses a method for preparing Afatinib. The method comprises the following steps: 4-fluoro-3-chloroaniline and N,N-dimethylformamide dimethylacetal (DMF-DMA) are subjected to condensation reaction so as to produce a Schiff base (III), and the Schiff base (III), without to the need of separation, is subjected to cyclization reaction with 2-cyano-4-[4-(N,N-dimethylamino)-1-oxo-2-buten-1-yl]amino-5-[(S)-(tetrahydrofuran-3-yl)oxy]aniline so as to prepare Afatinib. According to the method, the steps for preparing Afatinib are reduced obviously, and the cost is reduced greatly.

The invention discloses a novel synthesis method of an anticancer medicine gefitinib. The preparing method includes subjecting 4-methoxy-5-(3-morpholinopropoxy)-2-nitrobenzonitrile that is adopted as a raw material to reduction by sodium hydrosulfite, salifying with hydrochloric acid, reacting with N,N-dimethylformamide dimethyl acetal to obtain a condensation product, subjecting the condensation product and 3-chloro-4-fluoroaniline to cyclization to obtain the gefitinib. The initial raw material adopted by the preparing method is cheap and easily available. The synthesis route is simplified. The raw material utilization rate and the total yield are largely increased. Reaction intermediates are mostly purified by a recrystallization method or are directly used for a next reaction. The method has characteristics of high yield, less three-waste in reaction processes and low cost, and is suitable for industrial production.

The invention discloses a preparation method of 1,4,7,10-tetraazacyclododecane. The method comprises the following steps: adopting triethylene tetramine, methyl benzene and water to obtain a triethylene tetramine hydrated crystal substance; heating the triethylene tetramine hydrated crystal substance and the methyl benzene to react to obtain a triethylene tetramine-methyl benzene solution, and obtaining linear triethylene tetramine through drying, filtration and reduced pressure distillation; enabling the linear triethylene tetramine, N,N-dimethylformamide dimethylacetal and methyl benzene to react, and crystallizing to obtain clear crystal bis-imidazoline; enabling potassium carbonate, solvent acetonitrile, bis-imidazoline and 1,2-ethylene dibromide to react, and conducting reduced pressure distillation, washing and drying to obtain bromine; under the protection of nitrogen, adding a potassium hydroxide water solution, heating to a back flow state, dropwise adding a bromine salt water solution, and conducting filtration, precipitation, condensation, cooling and crystallization to obtain the 1,4,7,10-tetraazacyclododecane. The invention also provides a preparation method of a polyamide nanofiltration membrane. According to the invention, the purity of 1,4,7,10-tetraazacyclododecane is improved.

The invention relates to a synthesis method of 6-chloroimidazo[1,2-a]pyridine-3-formonitrile. The synthesis method of the 6-chloroimidazo[1,2-a]pyridine-3-formonitrile comprises the following steps: reacting 2-amino-5-chloropyridine and N,N-dimethylformamide dimethylacetal at a temperature ranging from 50 to 110 DEG C for 2-10 hours to obtain (E)-N'-(5-chloropyridine-2-yl)-N,N-dimethylformamidine, next, reacting (E)-N'-(5-chloropyridine-2-yl)-N,N-dimethylformamidine with bromoacetonitrile at a temperature ranging from 50 to 150 DEG C for 5-35 hours under the action of a base in a solvent, then carrying out ethyl acetate extraction, water washing, drying and rotary evaporation and concentration to obtain the coarse product of the 6-chloroimidazo[1,2-a]pyridine-3-formonitrile, and recrystallizing the coarse product solvent to obtain the pure product. The synthesis method of the 6-chloroimidazo[1,2-a]pyridine-3-formonitrile has the beneficial effects of mild reaction conditions, easiness for operation, stable product quality and high product purity.

The invention relates to a synthetic method of ethyl 3-aldehyde-6-chloroimidazo[1,2-a]pyridine-8-formate. The method comprises the following steps: carrying out a substitution reaction on ethyl 2-aminonicotinate and N-chlorosuccinimide in a certain solvent at normal temperature to prepare ethyl 2-amino-5-chloronicotinate; and reacting2-amino-5-chloronicotinate with N,N-dimethylformamide dimethyl acetal to prepare an intermediate, reacting the intermediate with chloroacetaldehyde in a certain solvent at 0-100DEG C without purifying the intermediate, cooling, and drying to obtain ethyl 3-aldehyde-6-chloroimidazo[1,2-a]pyridine-8-formate. The method has the advantages of easily available reaction raw materials, reasonable price, mild reaction conditions, easy operation, easy control and simple post-treatment, and the above obtained product has the advantages of stable quality and high purity.

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 belongs to the field of organic synthesis, and particularly relates to a synthesis method of imidazo[1,2-alpha]pyridyl-3-formic acid. The method comprises the following steps: reacting N,N-dimethylformamidodimethyl acetal with 2-aminopyridine at 40-100 DEG C for 2-8 hours to obtain an N,N-dimethyl-N'-2-pyridylformamidine intermediate, reacting the intermediate with ethyl bromoacetate at 50-160 DEG C, and recrystallizing to obtain a pure product; carrying out hydrolysis reaction on ethyl imidazo[1,2-alpha]pyridyl-3-formate in a certain solvent for 1-5 hours; and after the reaction finishes, neutralizing with hydrochloric acid, filtering, washing with water, and drying to directly obtain the imidazo[1,2-alpha]pyridyl-3-formic acid pure product. The method has the advantages of accessible reaction raw materials, reasonable price, mild reaction conditions and simple after-treatment, and is easy to operate and control; and the product has the advantages of stable quality and high purity.

The invention discloses a preparation technology for a 3-aryl-4-nitro isoxazole compound. The preparation technology comprises the following steps: synthesizing a compound shown as formula II through the nucleophilic addition of hydroxylamine hydrochloride and the compound shown as formula I used as the raw material; acquiring the compound shown as formula III through the substitution reaction of the compound shown as formula II and N-chlorosuccinimide; preparing 1-dimethyl amino-2-nitro ethylene through the reaction of N,N-dimethylformamide dimethyl acetal and nitromethane used as the raw material; and acquiring a target product 3-aryl-4-nitro isoxazole compound through the cyclization reaction of the compound shown as formula III and 1-dimethyl amino-2-nitro ethylene. The raw materials in the synthesis route are low in cost and easily acquired, the operation condition is mild and is easily controlled, the product is easily purified and the preparation technology is a new method for synthesizing the 3-aryl-4-nitro isoxazole compound.

The invention discloses a method for preparing Alisertib (I), which comprises the following steps: an addition reaction is carried out between 3-[(2-fluoro-6-methoxyl) phenyl]-5-chlorobenzene phthalein (II) and acetonitrile, so as to generate 1,3-dihydro-1-hydroxyl-3-[(2-fluoro-6-methoxyl) phenyl]-5-chloro-isobenzofuranone-1-acetonitrile (III); a condensation reaction is carried out between the intermediate (III) and N,N-dimethyl formamide-dimethylacetal (DMF-DMA), so as to generate 3-{[1-(4-chlorphenyl)-1'-(2-fluoro-6-methoxyphenyl) methanol]-2-group}-2-[2-(dimethylamino) methene]-3-oxa-propionitrile (IV); a cyclization reaction is carried out between the intermediate (IV) and 4-guanidine-2-methoxyl benzoate hydrochloride (VI), so as to generate 4-{[4-[1-(4-chlorphenyl)-1'-(2-fluoro-6-methoxyphenyl) methanol]-5-pyrimidine-carbonitrile-2-group] amino}-2-methoxyl benzoic acid (V); Alisertib (I) is obtained by reducing, oxidizing and cyclizing the intermediate (V). The method has the advantages that the process is easy; the raw materials are easy to obtain; the requirement for industrial magnification is met.

The invention relates to the field of organic synthesis, and particularly relates to a synthetic method for imidazo-[1, 2a]-3,8-PET, which comprises the following steps of reacting N, N-dimethylformamide dimethyl acetal with ethyl 2-aminopyridine-3-carboxylate at 40-100 DEG C to obtain a purification-free intermediate. The intermediate and ethyl bromoacetate, in a certain proportion, react with each other at 50-160 DEG C in a certain solvent under the effect of alkali. When the reaction is finished, the obtained product is cooled to the room temperature, extracted in the ethyl acetate solution, washed in water and NaCl saturated solution, dried by anhydrous sodium sulfate, rotated, evaporated and concentrated to obtain an imidazo-[1, 2a]-3,8-PET primary product. The imidazo-[1, 2a]-3,8-PET primary product is recrystallized in a mixed solution of n-hexane and ethyl acetate in the volume ratio of 1:1, and then a pure product can be obtained. The above method is easily available in reaction raw material, reasonable in price, mild in reaction condition, easy to operate, easy to control and simple in post-treatment. Products obtained through the above method are stable in quality and high in purity.