52 results about "Formamidine acetate" patented technology

The invention discloses a novel method used for preparing high-purity 4-chloropyrrolo[2,3-d]pyrimidine in industrialization scale. According to the method, ethyl cyanoacetate, bromo-acetal, formamidine acetate, and sodium alcoholate are taken as raw materials; N,N-dimethylformamide, ethyl alcohol, and phosphorus oxychloride are taken as solvents; and 4-chloropyrrolo[2,3-d]pyrimidine is obtained via three-step approach. The process route of the method is simple; time is short; next step feed can be carried out directly without complex purification process of intermediates; no toxic agent is used; the method is safe and reliable, and is low in cost; total yield is higher than 30%; and the purity of obtained products is as high as 99.2%.

The invention discloses a novel amino acid derivative L-4-terazine-phenylalanine (3-(4-(1,2,4,5-tetrazin-3-yl) phenyl)-2-aminopropanoic acid). L-4-cyan-phenylalanine is used as an initial reactant and reacts with formamidine acetate and anhydrous hydrazine under catalysis of sulfur; then the reactants are oxidized by sodium nitrite to generate L-4-1,2,4,5-terazine-phenylalanine. The L-4-1, 2, 4, 5-terazine-phenylalanine is integrated into the biologically active peptide and protein molecules as phenylalanine / tyrosine analogue, and can be applied to on biological orthogonal field based on inverse electronic Diels-Alder reaction as a biomarker; meanwhile, the L-4-1,2,4,5-terazine-phenylalaninethe can be introduced into biologically active peptide as phenylalanine / tyrosine analogue through solid phase polypeptide synthesis method and conduct pharmacological evaluation, so as to improve drug property of certain biologically active peptide.

The invention discloses a room-temperature A-site doping method for APbX3 perovskite quantum dots. The method comprises the following steps: 1) dissolving lead bromide and an organic ligand in toluene, performing stirring to dissolve the lead bromide and the organic ligand in order to obtain a lead precursor, and dissolving cesium carbonate, and formamidine acetate, methylamine acetate or guanidine carbonate in a long alkyl chain organic acid to obtain a doped A-site precursor, wherein the doped A-site precursor includes a doped A-site precursor salt; 2) injecting the doped A-site precursor obtained in step 1) into the lead precursor obtained in the step 1), and carrying out a full reaction to obtain a quantum dot stock solution; and 3), centrifuging and purifying the quantum dot stock solution obtained in step 2) to obtain A-site doped APbX3 perovskite quantum dots. The room-temperature A-site doping method for APbX3 perovskite quantum dots improves the performances of perovskite QLEDdevices by doping the A-site Cs matrix of the CsPbX3 with formamidine, methylamine or guanidine. The fluorescence quantum yield PLQY of the doped APbX3 quantum dots reaches 90% or above, and the efficiency (EQE) of the QLEDs of the doped APbX3 quantum dots reaches 10 or more.

The invention relates to a method for preparing a gefitinib intermediate, in particular to a method for preparing 4-chlorine-6-(3-chlorine propoxy)-7-methoxy quinazoline. A formula II compound 6-(3-hydroxy propoxy)-7-methoxy quinazoline-4 (3H)-ketone and thionyl chloride are reacted to obtain the gefitinib intermediate. The formula II compound uses 5-hydroxy-4-methoxy group-2-nitrobenzene methyl formate as a raw material to be condensed with halohydrin shown in a formula VI, nitro is reduced, and formamidine acetate cyclization and thionyl chloride chlorination are reacted to obtain the gefitinib intermediate. The synthesis scheme provided by the invention reduces the generation of by-products by introduction of hydroxyl, the production cost is reduced, meanwhile, the environment pollution is reduced, the quality of products is increased, and the purity of the prepared 4-chlorine-6-(3-chlorine propoxy)-7-methoxy quinazoline is over 98 percent. Compared with the prior art, the method is greatly increased and improved, wherein, X is halogen.

The invention discloses a method for preparing a 4,6-dichloro-5-fluoropyrimidine compound, which comprises the following steps: preparing 4,6-dihydroxy-5-fluoropyrimidine from 2-diethyl fluoropropionate and formamidine acetate in the presence of sodium methoxide; and reacting 4,6-dihydroxy-5-fluoropyrimidine with a solvent and a chlorinating agent in the presence of tertiary amine catalyst to obtain 4,6-dichloro-5-fluoropyrimidine. The invention has the advantages of simple process, low cost, environment friendly, high yield and high purity of the product.

The invention relates to a preparation method of voriconazole, wherein the preparation method comprises the following specific steps: adding alpha-fluoropropionyl ethyl acetate and a methanol solution of formamidine acetate into a methanol solution of sodium methylate, carrying out cyclization to obtain 6-ethyl-5-fluoropyrimidine-4(3H)-one, chloridizing to obtain 4-chloro-6-ethyl-5-fluoropyrimidine, dissolving 4-chloro-6-ethyl-5-fluoropyrimidine in tetrahydrofuran, dropwise adding into a tetrahydrofuran solution of lithium diisopropylamide, adding a tetrahydrofuran solution of 1-(2,4-difluorophenyl)-2-(1H-1,2,4-triazole-1-yl)ethyl ketone, carrying out a reaction to obtain 3-(4-chloro-5-fluoropyrimidine-6-yl)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazole-1-yl)butyl-2-ol, dissolving in ethanol, adding 10% palladium-carbon and sodium acetate, and then splitting to obtain voriconazole. According to the preparation method of voriconazole, the preparation method is simple, and the production cost is low.

The invention discloses a preparation method of Afatinib. According to the method, 4-fluorobenzonitrile is taken as the raw material, and an intermediate 3-[4-(N,N-dimethylamino)-1-oxo-2- butene-1-yl] amino-4-[(S)-(tetrahydrofuran-3-yl) oxy]-6-aminobenzonitrile (IX) is obtained after nitrification, reduction, acylation, nitrification and reduction; the intermediate (IX) and formamidine acetate are subjected to ring closure to generate 4-amino-6-[[4-(N,N-dimethylamino)-1-oxo-2- butene-1-yl] amino]-7-[(S)-tetrahydrofuran-3-yl) oxy]quinazoline (X); the intermediate (X) and 3-chloro-4-phenylboronic acid have a Chan-Lam reaction to generateAfatinib (I). Cheap 4-fluorobenzonitrilewhich is easy to obtain is taken as the starting raw material, a preparation method of the intermediate (X) is not reported, and the preparation method of Afatinib (I) is not reported in literature.

The invention relates to a preparation method of formamidinium bromide perovskite quantum dots with controllable size. The preparation method comprises the following steps: 1) completely dissolving a certain amount of formamidine acetate, lead bromide, hydrogen bromide, oleic acid and oleylamine in dimethylformamide to prepare a perovskite precursor; 2) injecting the precursor and different amounts of hydrogen bromide solutions into toluene to obtain a mixed solution; 3) centrifuging the mixed solution in a centrifuge tube to remove impurities to obtain formamidinium bromide perovskite quantum dots; and 4) dispersing the product in toluene to obtain the formamidinium bromide perovskite quantum dots with controllable size. The method has the advantages that the raw materials are cheap and easy to obtain, required equipment is simple, popularization is easy, and the size of the quantum dots can be adjusted by adding the amount of HBr. The quantum dots are suitable for the technical field of quantum dot material controllable preparation.

The invention relates to a method for preparing a pyrazole derivative for preparing ibrutinib, and belongs to the technical field of pharmacy. The method comprises the following steps: reacting raw materials with formamidine acetate in an organic solvent at 80-130 DEG C, cooling after the reaction is completed, and collecting solids to obtain a product, wherein the organic solvent is one or more of N,N-dimethyl formamide, N,N-dimethylacetamide, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, glycol dimethyl ether, n-butyl alcohol, isobutanol, n-amyl alcohol and isoamyl alcohol. The method can be used for solving the problem of long-time high temperature reaction in the prior art, is simple and convenient, is low in cost, and is suitable for industrial production.

The invention relates to a method for preparing formamidine acetate. The method comprises the following steps of: according to a molar ratio of 1.0:(0.9-1.5):(0.9-1.5):(1.0-2.0):(2.0-5.0) of formonitrile to anhydrous fatty alcohol to anhydrous hydrogen chloride to ammonium acetate to ammonia, generating a hydrochloride of alkyl carbamate by the formonitrile, the anhydrous fatty alcohol and the anhydrous hydrogen chloride; generating ammonium chloride and an acetate of the alkyl carbamate by exchanging with the ammonium acetate without generating orthoformic acid trialkyl ester through alcoholysis; and continuously ammoniating the acetate of the alkyl carbamate to generate the formamidine acetate. In the reaction process of the method, the raw materials do not contain the orthoformic acid trialkyl ester, thus the reaction process has simple operation, low cost, less environmental pollution and high yield.

The invention discloses a one-pot method for preparing pyrrolo[2,1-F][1,2,4]triazin-4-amine, and belongs to the field of organic chemical synthesis. According to the method, a one-pot method is adopted, pyrrole is used as a raw material, chlorosulfonyl isocyanate is used as a cyanation reagent, O-[4-nitro-2-(trifluoromethyl)phenyl] hydroxylamine is used as an amination reagent, formamidine acetateis used as a cyclization reagent, and the pyrrolo[2,1-F][1,2,4]triazin-4-amine with a high yield and high purity is prepared. The method disclosed by the invention is simple to operate, high in product yield, high in purity, mild in reaction condition, less in energy consumption, less in pollution and very suitable for industrial production.

The invention discloses a method for preparing 4-amino-3-(4-aminobenzene)furo[2,3-d] pyrimidine. The method comprises the following steps: using nitroacetophenone as a raw material, reacting the nitroacetophenone and N-bromo-succinimide to generate 2-bromo-1-(4-nitrophenyl)aceton by using para-toluenesulfonic acid as a catalyst, further reacting the 2-bromo-1-(4-nitrophenyl)aceton, sodium acetate and tetrabutylammonium bromide to generate 2-acetoxyl-1-(4-nitrophenyl)aceton, through reducing nitro into amino, reacting the 2-bromo-1-(4-nitrophenyl)aceton and hydrochloric acid, and reducing acetoxyl group into hydroxy to obtain 1-(4-aminophenyl)-2-hydroxy-aceton; then reacting the 1-(4-aminophenyl)-2-hydroxy-aceton, malononitrile and diethylamine to obtain 2-amino-4-(4-aminophenyl)-3-furan nitrile; finally reacting the 2-amino-4-(4-aminophenyl)-3-furan nitrile and formamidine acetate to obtain the 4-amino-3-(4-aminobenzene)furo[2,3-d] pyrimidine. The method has the advantages that the operation is simple and the total recovery is high.

The invention discloses a chemical modification method for laccase and application of modified laccase. The chemical modification method for laccase comprises the following steps: successively addinga laccase inhibitor, a carboxyl activator and an amino group-containing chemical modifier into an aqueous laccase solution, and carrying out dialysis on a reaction system after a reaction is completedso as to obtain chemically-modified laccase, wherein the amino group-containing chemical modifier is formamidine acetate or L-tryptophan methyl ester hydrochloride, and the carboxyl activator is 2-ethyl-5-phenylisoxazolium-3'-sulfonate. According to the chemical modification method for laccase, the laccase inhibitor is added in the process of a cross-linking reaction so as to protect the active center site of laccase from influence, so the active group, i.e., the carboxyl group, on a laccase chain is protected by forming a peptide bond through the cross-linking reaction of activated carboxylgroups and amino groups, which enables the chemical modification effect of the laccase to be effectively ensured. The chemically-modified laccase prepared in the invention can be widely applied to fiber modification for improvement of the paper making performance of fibers.