49 results about "Piperidinedione" patented technology

The present invention relates to improved processes for preparing 3-(4-amino-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione (I) (lenalidomide) and its intermediate 3-(1-oxo-4-nitro-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione. The present invention further relates to improved processes for preparing lenalidomide crystalline form A, use of said crystalline form A as an active pharmaceutical ingredient or as an intermediate in the preparation of further crystalline or amorphous forms of lenalidomide, compositions comprising lenalidomide crystalline form A and their use in the treatment of disease.

The invention discloses a method for preparing lenalidomide. The method comprises the following steps: firstly, etherifying 2-methyl-3-nitrobenzoic acid to obtain 2-methyl-3-nitrobenzoic acid methyl ester, brominating to obtain 2-brooethyl-3-nitrobenzoic acid methyl ester, reacting L-glutamine and tert-butyl dicarbonate to obtain N-Boc glutamic acid, acquiring 3-amino-2,6-piperidine diketone protected by Boc from N-Boc-glutamic acid in the presence of a condensing agent and a catalyst, further reacting with acid to prepare 3-amino-2,6-piperidine diketone hydrochloride, reacting 3-amino-2,6-piperidine diketone with 2-brooethyl-3-nitrobenzoic acid methyl ester so as to obtain 3-(4-nitryl-1,3 dihydro-1-oxo-2 hydrogen-isobenzazole-2-yl) piperidine-2,6-diketone, and finally reducing, thereby obtaining lenalidomide. The method disclosed by the invention is high in product yield.

The invention relates to the field of drug synthesis, and particularly relates to a preparation method of a lenalidomide intermediate and lenalidomide. The compound is a drug for treating multiple myeloma. The method comprises the steps of adopting 2-bromomethyl-3-nitrobenzoate and 3-amino-2,6-piperidione hydrochloride as reaction substrates and an inorganic base as an acid-binding agent and obtaining a white to almost white key intermediate 3-(4-nitro-1-oxo-1,3-dihydro-2H-isoindole-2-yl) piperidine-2,6-diketone of the lenalidomide through simple post-treatment; and adopting a mixed solvent of an organic solvent and water as a reaction solvent and carrying out catalytic hydrogenation in the presence of palladium on carbon to prepare the lenalidomide (II). The process route is low in production cost, and a product is high in purity and friendly to environment, and has relatively great implement value and social and economical benefits.

A novel dentifrice composition is provided for prevention or treatment of carcinoma of the oral cavity, caries and periodontal diseases of the oral cavity. The dentifrice composition contains a silica abrasive and medicinal agents useful in the treatment of human neoplastic disease. The medicinal agent is selected from the group consisting of 3-N-phenylacetylamino-2,6-piperidinedione, phenylacetylglutamine, phenylacetylisoglutamine, phenylbutyrate, phenylacetate, combinations thereof and pharmaceutically acceptable salts thereof. The components of the dentifrice composition act advantageously to allow the composition to remove plaque, tartar, and oral disease-causing bacteria.

The present invention relates to 3-(4-amino-1, 3-dihydro-1-oxo-2 H-isoindole-2-yl)-2, 6-piperidinedione preparation method. The method is as follows: in the presence of reducing system, a target product is prepared by reaction of formula (II) compound in an organic solvent. The method provided by the present invention has no need to use hydrogen as a reducing agent, and is safe, low in cost, high in yield, easy in purification and easy in industrialization.

The invention relates to novel 3-(4-amino-1,3-dihydro-1-oxo-2H-isoindole-2-yl)-2,6-piperidinedione crystal form and a preparation method thereof, and particularly to four novel crystal forms, namely, crystal form X, crystal form XI, crystal form XII and crystal form XIII, and the preparation method of the novel crystal forms. The four novel crystal forms are stable to store, good in flowability, small in static electricity, more applicable to medicine preparations, simple and efficient in preparation process, capable of achieving on-scale production and environmental friendly.

The present invention relates to a method for alleviation, prevention, and treatment of attention deficit disorder, sexual dysfunction, and related conditions by administering certain bioactive metabolites of the known anti-depressant compound gepirone. In a preferred embodiment, the compound is 4,4,-dimethyl-3-hydroxy-1-[4-[4-(2-pyrimidinyl)-1-piperazinyl]butyl]-2,6-piperidinedione (3-OH gepirone).

The invention discloses a synthetic process of 1-alkyl-4-p-fluorophenyl-2,6-piperadinedione-3-formic ester. The synthetic process comprises the following steps of using 1-alkyl-4-p-fluorophenyl-2,6-piperadinedione-3,5-diformic ester, sodium hydroxide water solution and the like as raw materials and lower fatty alcohol as a solvent to undergo selective hydrolysis reaction through a chemical method, cooling, diluting, filtering, recovering unreacted raw materials, acidifying the filtrate, filtering, washing and drying in vacuum, thus obtaining an intermediate 1-alkyl-4-p-fluorophenyl-2,6-piperadinedione-3-formic acid-5-formic ester; then dissolving the intermediate in an organic solvent, adding a small amount of catalyst to carry out decarboxylic reaction, cooling, filtering, adding water to the filtrate to be stirred for layering, recovering a solvent at reduced pressure with an organic phase, and carrying out cooling crystallization on the residues, thus obtaining the product 1-alkyl-4-p-fluorophenyl-2,6-piperadinedione-3-formic ester. The synthetic process is short in route, is efficient, has the characteristics of cheap and accessible raw materials, high product yield, less three wastes and the like, and is suitable for large-scale industrial production.

The invention discloses an antitumor drug lenalidomide intermediate preparation method. The preparation method comprises the following steps: 1) under existence of cuprous iodide and organic alkali, performing contact reaction between 4-nitro indoline and 3-bromine-2,6-piperidine to obtain 3-(4-nitro-1,3-xylylenimine-2-yl)piperidine-2,6-diketone; 2) performing oxidizing reaction on the 3-(4-nitro-1,3-xylylenimine-2-yl)piperidine-2,6-diketone obtained in the step 1) to obtain lenalidomide intermediate of 3-(4-nitro-1-oxo-1,3-xylylenimine-2-yl)piperidine-2,6-diketone. The method disclosed by the invention has obviously smaller steps, the raw materials are easy to obtain, a yield is also improved, and the method is more suitable for industrial production.

The invention belongs to the field of chemical synthesis, and particularly relates to a method for synthesizing lenalidomide. The method adopts three-step polymerization, and specifically comprises: (1) carrying out a bromination reaction on 2-methyl-3-nitromethyl benzoate as a starting raw material and a bromination reagent to generate a compound 1 2-bromomethyl-3-nitromethyl benzoate; (2) performing cyclization on the compound 1 and 3-aminopiperidine-2,6-dione hydrochloride under a solvent-free condition to generate a compound 2 3-(4-nitro-1-oxo-1,3-dihydroisoindole-2-yl)piperidine-2,6-dione; and (3) reducing the compound 2 with a reducing agent to obtain lenalidomide. According to the invention, the method is a novel preparation process method of lenalidomide, and has advantages of easily available process raw materials, short steps, simple and convenient operation, environmental friendliness, implementation value of industrial production, and social and economic benefits.

The invention provides a novel protein degradation targeting chimeric compound, application and a preparation method thereof. The protein degradation targeting chimeric compound is 2-(2, 6-dioxo-piperidine-3-yl)-4-fluoro-isoindole-1, 3-dione. The preparation method comprises the following steps: S1, carrying out a fluorination reaction on 3-chlorophthalic anhydride to generate 3-fluorophthalic anhydride; and step S2, carrying out a condensation reaction on the 3-fluorophthalic anhydride and 3-amino-2, 6-piperidinedione hydrochloride so as to obtain the 2-(2, 6-dioxo-piperidine-3-yl)-4-fluoro-isoindole-1, 3-dione. According to the protein degradation targeting chimeric body, the compound is moderate in molecular size, good in fluorine leaving performance, small in molecular weight and stable in performance, target protein and E3 ubiquitin enzyme can be effectively close to each other, and the protein degradation targeting chimeric body can be effectively used for preparing targeting drugs. And the preparation method is simple and convenient, less in three wastes and low in raw material price, so that the preparation cost is low, and the method is suitable for industrial large-scaleproduction.

The invention discloses a medicine for treating angina. The medicine for treating the angina is mainly prepared from, by weight, 8-19 parts of Phenobarbital, 17-25 parts of cannabinoid A, 5-10 parts of a ginkgo biloba extract, 2-6 parts of isosorbide-5-mononitrate, 11-18 parts of ibuprofen, 1.5-1.8 parts of heparin, 0.5-1.9 parts of crospovidone, 8-15 parts of sodium alginate and 2-4 parts of 3-ethyl-(4-aminophenyl)-piperidinedione. The prepared medicine can quickly relieve myocardial ischemia and myocardial infarction angina, the treatment effect is significant, and the angina does not relapse for a long term after being cured.

Bioactive gepirone metabolites, such as 3-OH gepirone (4,4,-dimethyl-3-hydroxy-1-[4-[4-(2-pyrimidinyl)-1-piperazinyl]butyl]-2,6-piperidinedione), and their pharmaceutically acceptable salts and hydrates, can be used to alleviate psychological disorders or the symptoms thereof. The use of these compounds provides advantages over other therapeutic azapirones as they possess superior bioavailability, faster onset of action, and more stable plasma levels when administered to a mammal.

Pharmaceutical compositions and single unit dosage forms of (S)-3-(4-((4-(morpholinomethyl)benzyl)oxy)-1-oxoisoindolin-2-yl)piperidine-2,6-dione, or a pharmaceutically acceptable stereoisomer, prodrug, salt, solvate, hydrate, or clathrate, are provided herein. Also provided are methods of treating, managing, or preventing various disorders, such as cancer, an inflammatory disease and/or an immune-related disorder.

The invention discloses a synthetic method of 2, 4-dioxopiperidine. The method comprises the following steps: by taking monomethyl malonate, 3-amino methyl propionate hydrochloride or 3-amino ethyl propionate hydrochloride as an initial raw material, dichloromethane as a solvent, dicyclohexylcarbodiimide (DDC) as a dehydrator and triethylamine as an acid-binding agent, carrying out a reaction; acidylating a condensation product methyl-3-((3-methoxyl-3-carbonyl propyl) amino)-3-carbonyl propionate, wherein in the acidylating condensation reaction process, onium salt is used as a catalyst which is good in selectivity, few in side reaction and higher in yield; then, circularly condensing to obtain 3-(carbomethoxy(methoxycarbonyl))-4-carbonyl-1, 4, 5, 6-tetrapyridine-2-alcoholic sodium under the effect of sodium methylate; and then, decarboxylating in a hydrochloric acid system to obtain 2, 4-dioxopiperidine. In the whole reaction, as methoxyl is easy to remove, so that the synthetic method is available in the raw materials, mild in reaction condition, safe to operate and high in conversion rate.

Disclosed are a series of tricyclic substituted piperidine diketone compounds and their application in the preparation of drugs for the treatment of CRBN protein-related diseases, specifically disclosing derivative compounds represented by formula (I) or pharmaceutically acceptable salts thereof .

The invention relates to a herbicide for gramineous crop fields and application of the herbicide. The herbicide at least comprises N-dichloroacetyl-3-benzoyl-2, 4-piperidinedione and the derivative of the N-dichloroacetyl-3-benzoyl-2, 4-piperidinedione or the effective constituent of the enol-form structure of the N-dichloroacetyl-3-benzoyl-2, 4-piperidinedione, wherein the formula of the N-dichloroacetyl-3-benzoyl-2, 4-piperidinedione is shown as follows, and X1, X2, X3 and X4 are hydrogen, C1-C4 gaseous normal alkyl, branched alkyl, halogen, nitryl, trifluoromethyl, sulfonyl or methanesulfonyl. The herbicide which can be prepared into wettable powder, water dispersible granules, suspending agent and dispersible oil suspension is good in weeding effect, safe to crops such as corn and wheat, wide in weeding spectrum and good in preventing effect on gramineous weeds.