[go: up one dir, main page]

CN101704796A - Preparation method of 3-morpholone - Google Patents

Preparation method of 3-morpholone Download PDF

Info

Publication number
CN101704796A
CN101704796A CN200910131764A CN200910131764A CN101704796A CN 101704796 A CN101704796 A CN 101704796A CN 200910131764 A CN200910131764 A CN 200910131764A CN 200910131764 A CN200910131764 A CN 200910131764A CN 101704796 A CN101704796 A CN 101704796A
Authority
CN
China
Prior art keywords
reaction
preparation
morpholone mai
solvent
morpholone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN200910131764A
Other languages
Chinese (zh)
Other versions
CN101704796B (en
Inventor
陈维
翁科杰
杨建军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ninhua Group co Ltd
Original Assignee
Sinochem Ningbo Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinochem Ningbo Ltd filed Critical Sinochem Ningbo Ltd
Priority to CN2009101317643A priority Critical patent/CN101704796B/en
Publication of CN101704796A publication Critical patent/CN101704796A/en
Application granted granted Critical
Publication of CN101704796B publication Critical patent/CN101704796B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

The invention provides a synthetic process of 3-morpholone. The traditional method for synthesizing the compound at home and abroad needs to use sodium metal or sodium-hydrogen and has high equipment investment and complex operation. In the synthetic process, 2-acetyl chloride aminoethanol generated by ethanolamine and chloroacetic chloride generates morpholone through ring closing reaction under the action of alkaline. The synthetic process has simpleness, low equipment requirement, simple operation, high product yield and good quality and is suitable for industrialized production.

Description

3-morpholone mai preparation method
Technical field
The present invention relates to a kind of preparation method of 3-morpholone mai.
Background technology
Morpholone mai is a kind of important compound.People are very interested in the compound of this class formation, and especially the research of 3-morpholone mai derivative more and more is subjected to people's attention, for example US6265402, US3308121, US6265402B1, CN1736992.The 3-morpholone mai is to produce multiple medicine and novel high polymer material (for example: important intermediate polyesteramide), it is widely used in organic synthesis, macromolecular material and pharmaceutical industry field.Produced (the J.Wuhan Univ. (Nat.Sci.Ed.) 2004 that this product mainly utilizes sodium Metal 99.5, thanomin and ethyl chloroacetate to produce in the past, 50, (2), 173-176, Journal ofPolymer Science, Part A Polymer Chemistry 2002,40, (24), 4550-4555, and US5349045); Or utilize sodium hydrogen, thanomin and ethyl chloroacetate to produce (W02006063113); Or utilize sodium Metal 99.5, thanomin and Mono Chloro Acetic Acid to produce (US4372974).Make a general survey of the 3-morpholone mai synthetic method of having delivered, no matter being to use sodium Metal 99.5 still is that the synthetic method of sodium hydrogen all exists complicated operation, the equipment requirements height, and therefore big the and low defective of yield of potential safety hazard is difficult to be applied to amplify production.
By retrieval, in the synthetic and preparation method of known 3-morpholone mai, current also do not have an industrial method of avoiding using sodium Metal 99.5 or sodium hydrogen and producing the 3-morpholone mai.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of 3-morpholone mai, this method has overcome in the conventional production 3-morpholone mai method, owing to need to use sodium Metal 99.5 or sodium hydrogen,, and be easy to suitability for industrialized production to equipment requirements height, potential safety hazard is big and yield is low defective.
For achieving the above object, the preparation method according to production 3-morpholone mai of the present invention comprises steps A: ring-closure reaction is taken place in solvent orange 2 A for 2-chloracetyl amido ethanol and alkali prepare the 3-morpholone mai, reaction formula is as follows:
Figure G2009101317643D0000021
Especially, above-mentioned steps A reaction can be carried out under the reflux temperature of-80 ℃~solvent orange 2 A, and the mol ratio of 2-chloracetyl ethanol and alkali is 1: (1~2), the reaction times is 0.5~48 hour.
Preferably, after the steps A reaction finishes, also comprise the separation purification step of 3-morpholone mai.
Preferably, the reacted separation purification step of described steps A comprises: (1) regulates PH=7; (2) Separation and Recovery solvent orange 2 A; (3) extraction and collected organic layer; And (4) re-crystallization step.
According to one embodiment of present invention, under-80 ℃~solvent orange 2 A reflux temperature, 2-chloracetyl amido ethanol and alkali are 1 with its mole number: the ratio of (1~2) joins in the solvent orange 2 A, under-80 ℃~solvent orange 2 A reflux temperature, reacts 0.5~48 hour; After described separation purification step is included in the reaction end, adds 37% concentrated hydrochloric acid and transfer PH=7, heating up steams solvent orange 2 A, remaining mixture is chilled to room temperature, the water that adds 5~10 times of remaining mixture volumes is used the methylene dichloride or the ethyl acetate extraction of 2~10 times of water yields, triplicate again, use anhydrous sodium sulfate drying, filter, be evaporated to dried crude product, add the solvent C dissolving, room temperature or be cooled to-80 ℃~25 ℃ recrystallizations 1~48 hour is filtered the crystal oven dry that obtains and is promptly made the 3-morpholone mai.
The described solvent orange 2 A of steps A can be selected from water, acetonitrile, methyl alcohol, ethanol, Virahol, sec-butyl alcohol, the trimethyl carbinol, the 3-amylalcohol, the 2-amylalcohol, tertiary amyl alcohol, 2-methyl-butanols, 3-methyl-3-amylalcohol, ethylene glycol, ethylene glycol monomethyl ether, glycol dimethyl ether, glycerine, N, dinethylformamide, N, the N-N,N-DIMETHYLACETAMIDE, N-Methyl pyrrolidone, dimethyl sulfoxide (DMSO), ethyl acetate, normal hexane, normal heptane, ether, sherwood oil, chloroform, methylene dichloride, tetrahydrofuran (THF), the 2-methyltetrahydrofuran, 1, the 4-dioxane, benzene, toluene, dimethylbenzene, sym-trimethylbenzene, chlorobenzene, dichlorobenzene, t-butyl methyl ether.
Alkali described in the steps A can be selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, sodium methylate, sodium ethylate, sodium isopropylate, potassium isopropoxide, sodium tert-butoxide, potassium tert.-butoxide, sodium tert-amyl alcohol, tertiary amyl alcohol potassium, sodium bicarbonate, saleratus, yellow soda ash, salt of wormwood, cesium carbonate, Quilonum Retard, sodium hydrogen, triethylamine, diisopropyl level ethylamine, tri-n-butylamine, pyridine, 2,6-lutidine.
Employed described solvent C is selected from water in the steps A reaction back separation purification step, acetonitrile, methyl alcohol, ethanol, Virahol, sec-butyl alcohol, the trimethyl carbinol, the 3-amylalcohol, the 2-amylalcohol, tertiary amyl alcohol, 2-methyl-butanols, 3-methyl-3-amylalcohol, ethylene glycol, ethylene glycol monomethyl ether, glycol dimethyl ether, glycerine, N, dinethylformamide, N, the N-N,N-DIMETHYLACETAMIDE, N-Methyl pyrrolidone, dimethyl sulfoxide (DMSO), ethyl acetate, normal hexane, normal heptane, ether, sherwood oil, chloroform, methylene dichloride, tetrahydrofuran (THF), the 2-methyltetrahydrofuran, 1, the 4-dioxane, benzene, toluene, dimethylbenzene, sym-trimethylbenzene, chlorobenzene, dichlorobenzene, t-butyl methyl ether.
Wherein, the solvent orange 2 A described in the steps A is preferably water, ethanol, tetrahydrofuran (THF), 1,4-dioxane, toluene; Described alkali is preferably sodium hydroxide, potassium hydroxide, sodium methylate, sodium ethylate; It is 1 that the mole ratio of 2-chloracetyl amido ethanol and alkali is preferably: (1~1.2); Reaction times under the solvent orange 2 A reflux temperature is preferably 12~24 hours.
Employed described solvent C is preferably tetrahydrofuran (THF), 1,4-dioxane, toluene, ether, ethyl acetate in the reacted separation purification step of steps A.
2-chloracetyl amido ethanol can be commercial also synthetic voluntarily.Preferably, the 2-chloracetyl amido ethanol in the preparation in accordance with the present invention can prepare by step B: in solvent B, thanomin reacts with chloroacetyl chloride in the presence of acid binding agent, and reaction formula is as follows:
Especially, above-mentioned steps B reaction can be carried out under the reflux temperature of-80 ℃~solvent B, and the reaction times is 0.5~48 hour, and the mol ratio of thanomin and acid binding agent is 1: 1~1: 2, and the mol ratio of thanomin and chloroacetyl chloride is 1: 1~1: 2.
Preferably, after above-mentioned steps B reaction finishes, comprise that 2-chloracetyl amido alcoholic acid separates purification step.
Preferably, the reacted separation purification step of described step B comprises: (1) Separation and Recovery solvent B; (2) extraction and collected organic layer; (3) concentrating under reduced pressure.
According to one embodiment of present invention, described step B reaction is: thanomin, acid binding agent are 1 with its mole number: the ratio of (1~2) and solvent B put in the reactor, measure the adding chloroacetyl chloride to be 1~2 times with the thanomin mol ratio, under-80 ℃~solvent B reflux temperature, reacted 0.5~48 hour; The reacted separation purification step of described step B comprises: heating up steams solvent B, remaining mixture is chilled to room temperature, the water that adds 5~10 times of remaining mixture volumes, use the methylene dichloride or the ethyl acetate extraction of 2~10 times of water yields again, triplicate is used anhydrous sodium sulfate drying, filters, concentrating under reduced pressure promptly gets 2-chloracetyl amido ethanol
The described solvent B of step B can be selected from water, acetonitrile, methyl alcohol, ethanol, Virahol, sec-butyl alcohol, the trimethyl carbinol, the 3-amylalcohol, the 2-amylalcohol, tertiary amyl alcohol, 2-methyl-butanols, 3-methyl-3-amylalcohol, ethylene glycol, ethylene glycol monomethyl ether, glycol dimethyl ether, glycerine, N, dinethylformamide, N, the N-N,N-DIMETHYLACETAMIDE, N-Methyl pyrrolidone, dimethyl sulfoxide (DMSO), ethyl acetate, normal hexane, normal heptane, ether, sherwood oil, chloroform, methylene dichloride, tetrahydrofuran (THF), the 2-methyltetrahydrofuran, 1, the 4-dioxane, benzene, toluene, dimethylbenzene, sym-trimethylbenzene, chlorobenzene, dichlorobenzene, t-butyl methyl ether.
The described acid binding agent of step B can be selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, sodium bicarbonate, saleratus, yellow soda ash, salt of wormwood, cesium carbonate, Quilonum Retard, triethylamine, diisopropyl level ethylamine, tri-n-butylamine, pyridine, 2,6-lutidine.
The described acid binding agent of step B is preferably and is selected from sodium hydroxide, potassium hydroxide, yellow soda ash, salt of wormwood, triethylamine, pyridine; The mole ratio of thanomin and acid binding agent is preferably 1: (1.1~1.5); Described solvent B is preferably and is selected from water, acetonitrile, methylene dichloride, tetrahydrofuran (THF), 1,4-dioxane, toluene; The mole ratio of thanomin and chloroacetyl chloride is preferably 1: (1.1~1.5); Reaction times under the solvent B reflux temperature is preferably 2~6 hours.
The 3-morpholone mai of the present invention's preparation has in organic synthesis, macromolecular material and pharmaceutical industry field widely to be used.
Embodiment
Describe the present invention below in conjunction with embodiment, but content of the present invention is not limited to this fully.
The preparation of embodiment 1:3-morpholone mai
Step 1:2-chloracetyl amido ethanol
61 gram thanomins and 151.7 gram triethylamines are dissolved in 800 milliliters of methylene dichloride, and 0 ℃ under agitation drips 169.4 gram chloroacetyl chlorides, after dropwising, stirring at room 6 hours adds 800 ml waters in the reaction solution, tell dichloromethane layer, water layer is with 300 milliliters of dichloromethane extractions, and triplicate merges organic layer, anhydrous sodium sulfate drying, concentrate, obtain yellow oil 122.4 grams, yield 89%, without being further purified, can be directly used in next step reaction.
Step 2:3-morpholone mai
122.4 gram 2-chloracetyl amido ethanol is dissolved in 100 ml waters, 180 grams, 20% aqueous sodium hydroxide solution splashes in room temperature, and 30 ℃ were reacted 24 hours, and the frozen water cooling adds 37% concentrated hydrochloric acid down and transfers PH=7, add 300 milliliters of ethyl acetate extractions, triplicate, the organic layer anhydrous sodium sulfate drying filters, be evaporated to dried, add 500 milliliters of ether recrystallizations, recrystallization temperature is-30 ℃, and crystallization time is 48 hours.The crystal oven dry that filtration obtains promptly makes 3-morpholone mai 73.8 grams, yield 82%.
Structural formula is as follows:
Figure G2009101317643D0000051
Molecular formula: C 4H 7NO 2
Molecular weight: 101.1
Proterties: colourless acicular crystal
Fusing point: 104-105 ℃
Nucleus magnetic resonance and mass-spectrometric data are as follows:
1H?NMR(500MHz,CDCl 3):δ8.13(s,1H),4.15(s,2H),3.83(t,J=5.0Hz,2H),3.41(m,2H);
13C?NMR(125MHz,CDCl 3):δ169.3,67.3,62.9,40.8;
MS(EI):(m/z)=101(M +).
The preparation of embodiment 2:3-morpholone mai
Step 1:2-chloracetyl amido ethanol
61 gram thanomins and 50 gram dissolution of sodium hydroxide are in 800 ml waters, and 0 ℃ under agitation drips methylene dichloride (300 milliliters) solution that contains 135.54 gram chloroacetyl chlorides, after dropwising, stirring at room 3 hours is told dichloromethane layer, and water layer is with 300 milliliters of dichloromethane extractions, triplicate, merge organic layer, anhydrous sodium sulfate drying concentrates, obtain yellow oil 107.3 grams, yield 78% without being further purified, can be directly used in next step reaction.
Step 2:3-morpholone mai
107.3 gram 2-chloracetyl amido ethanol is dissolved in 100 milliliters of ethanol, 600 milliliters of ethanolic solns that contain 63.7 gram sodium ethylates splash in room temperature, after dropwising, 30 ℃ were reacted 12 hours, reaction solution is chilled to room temperature, splash into 200 milliliters in water, the frozen water cooling adds 37% concentrated hydrochloric acid down and transfers PH=7, and ethanol is reclaimed in underpressure distillation, add 300 milliliters of ethyl acetate extractions in the residuum, triplicate, the organic layer anhydrous sodium sulfate drying filters, be evaporated to dried, add 600 milliliters of toluene recrystallizations, recrystallization temperature is-20 ℃, and crystallization time is 36 hours.The crystal oven dry that filtration obtains promptly makes 3-morpholone mai 59.1 grams, yield 75%.
The preparation of embodiment 3:3-morpholone mai
Step 1:2-chloracetyl amido ethanol
61 gram thanomins and 166 gram salt of wormwood are suspended in 800 milliliters of tetrahydrofuran (THF)s, 0 ℃ under agitation drips 169.4 gram chloroacetyl chlorides, after dropwising, stirring at room 6 hours, tetrahydrofuran (THF) is reclaimed in underpressure distillation, add 200 ml waters and 300 milliliters of methylene dichloride in the reaction solution, tell dichloromethane layer, water layer is with 300 milliliters of dichloromethane extractions, triplicate, merge organic layer, anhydrous sodium sulfate drying concentrates, obtain yellow oil 110 grams, yield 80% without being further purified, can be directly used in next step reaction.
Step 2:3-morpholone mai
110 gram 2-chloracetyl amido ethanol are dissolved in 100 milliliters of ethanol, 800 milliliters of ethanolic solns that are dissolved with 44.9 gram potassium hydroxide splash in room temperature, after dropwising, 30 ℃ were reacted 24 hours, reaction solution is chilled to room temperature, splash into 200 milliliters in water, the frozen water cooling adds 37% concentrated hydrochloric acid down and transfers PH=7, and ethanol is reclaimed in underpressure distillation, adds 300 milliliters of ethyl acetate extractions, triplicate, the organic layer anhydrous sodium sulfate drying filters, and is evaporated to 400 milliliters of ethyl acetate decrease temperature crystallines of residue, Tc is-20 ℃, and crystallization time is 24 hours.The crystal oven dry that filtration obtains promptly makes 3-morpholone mai 58.2 grams, yield 72%.

Claims (10)

1. the preparation method of a 3-morpholone mai comprises steps A:, ring-closure reaction in solvent, is taken place and prepares the 3-morpholone mai in 2-chloracetyl amido ethanol and alkali.
2. the preparation method of 3-morpholone mai according to claim 1 is characterized in that reaction conditions is: temperature of reaction by-80 ℃~the reflux temperature of use solvent, reaction times 0.5-48 hour, be preferably and under the reflux temperature of solvent, reacted 12~24 hours; The mol ratio of 2-chloracetyl ethanol and alkali is between 1: 1~1: 2, be preferably 1: 1~and between 1: 1.2.
3. the preparation method of 3-morpholone mai according to claim 1 is characterized in that described alkali is selected from sodium hydroxide, potassium hydroxide, sodium methylate and sodium ethylate, and described solvent is selected from water, ethanol, tetrahydrofuran (THF), 1,4-dioxane, toluene.
4. according to the preparation method of each described 3-morpholone mai among the claim 1-3, after the reaction that it is characterized in that steps A finishes, also comprise the separation purification step of 3-morpholone mai.
5. the preparation method of 3-morpholone mai according to claim 4 is characterized in that described separation purification step comprises: (1) regulates PH=7; (2) Separation and Recovery is reacted employed solvent; (3) extraction and collected organic layer; And (4) re-crystallization step.
6. the preparation method of 3-morpholone mai according to claim 1, it is characterized in that, described 2-chloracetyl amido ethanol passes through step B prepared in reaction: under the condition that acid binding agent exists, thanomin and chloroacetyl chloride be prepared in reaction 2-chloracetyl amido ethanol in solvent.
7. the preparation method of 3-morpholone mai according to claim 6, it is characterized in that described step B reaction conditions is: be reflected at temperature of reaction by-80 ℃~carry out under the reflux temperature of use solvent, reaction times is 0.5~48 hour, is preferably to react under the reflux temperature of use solvent 2~6 hours; The mol ratio of thanomin and acid binding agent is 1: 1~1: 2, is preferably 1: 1.1~1: 1.5, and the mol ratio of thanomin and chloroacetyl chloride is 1: 1~1: 2, is preferably 1: 1.1~1: 1.5.
8. the preparation method of 3-morpholone mai according to claim 6, it is characterized in that: described acid binding agent is selected from sodium hydroxide, potassium hydroxide, salt of wormwood, triethylamine, pyridine, described solvent is selected from water, acetonitrile, methylene dichloride, tetrahydrofuran (THF), 1,4-dioxane, toluene.
9. according to the preparation method of each described 3-morpholone mai among the claim 6-8, it is characterized in that comprising that also 2-chloracetyl amido alcoholic acid separates purification step after described step B reaction finishes.
10. the preparation method of 3-morpholone mai according to claim 9,2-chloracetyl amido alcoholic acid separation purification step comprises under it is characterized in that: the employed solvent of reaction among (1) Separation and Recovery step B; (2) extraction and collected organic layer; (3) concentrating under reduced pressure.
CN2009101317643A 2009-04-01 2009-04-01 Preparation method of 3-morpholone Expired - Fee Related CN101704796B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009101317643A CN101704796B (en) 2009-04-01 2009-04-01 Preparation method of 3-morpholone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009101317643A CN101704796B (en) 2009-04-01 2009-04-01 Preparation method of 3-morpholone

Publications (2)

Publication Number Publication Date
CN101704796A true CN101704796A (en) 2010-05-12
CN101704796B CN101704796B (en) 2011-12-21

Family

ID=42375060

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009101317643A Expired - Fee Related CN101704796B (en) 2009-04-01 2009-04-01 Preparation method of 3-morpholone

Country Status (1)

Country Link
CN (1) CN101704796B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103804316A (en) * 2012-11-13 2014-05-21 天津药物研究院 Preparation method of (2RS, 3RS)-6-[a-(2-ethoxyl phenoxyl) benzyl] morpholine-3-one (I)
CN103880768A (en) * 2014-02-26 2014-06-25 南通大学 Chemical synthesis method of 3-cyclobutylmorpholine
CN104356086A (en) * 2014-11-28 2015-02-18 湖南科技大学 Preparation method of 3-morpholone suitable for industrial production
CN115947697A (en) * 2022-12-28 2023-04-11 苏州汉德创宏生化科技有限公司 Synthesis method of 3-oxomorpholine-4-carboxylic acid tert-butyl ester

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102746288B (en) * 2012-07-24 2015-04-08 常州制药厂有限公司 Preparation methods of anticoagulant and key intermediate of anticoagulant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5349045A (en) * 1993-01-26 1994-09-20 United States Surgical Corporation Polymer derived from cyclic amide and medical devices manufactured therefrom

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103804316A (en) * 2012-11-13 2014-05-21 天津药物研究院 Preparation method of (2RS, 3RS)-6-[a-(2-ethoxyl phenoxyl) benzyl] morpholine-3-one (I)
CN103880768A (en) * 2014-02-26 2014-06-25 南通大学 Chemical synthesis method of 3-cyclobutylmorpholine
CN103880768B (en) * 2014-02-26 2016-04-13 南通大学 A kind of chemical synthesis process of 3-cyclobutyl morpholine
CN104356086A (en) * 2014-11-28 2015-02-18 湖南科技大学 Preparation method of 3-morpholone suitable for industrial production
CN115947697A (en) * 2022-12-28 2023-04-11 苏州汉德创宏生化科技有限公司 Synthesis method of 3-oxomorpholine-4-carboxylic acid tert-butyl ester

Also Published As

Publication number Publication date
CN101704796B (en) 2011-12-21

Similar Documents

Publication Publication Date Title
CN102627573B (en) Synthesis method for 5-aminolevulinic acid hydrochloride
KR101466245B1 (en) Method for preparing methanesulfonic acid salt and novel compound used therein
CN101704796B (en) Preparation method of 3-morpholone
CN112110828A (en) Synthesis method of pipadiric acid and intermediate thereof
US11401235B2 (en) Synthesis of terphenyl compounds
CN102351778A (en) Preparation method of arbidol hydrochloride
CA2670282A1 (en) A new method for preparing 4,4'-(1-methyl-1,2-ethandiyl)-bis-(2,6-piperazinedione)
CN102863359A (en) Synthesis method of anti-flu medicine
CN103373963B (en) Intermediate of pazopanib hydrochloride and preparation method thereof
CN103288693B (en) Method for preparing 1-mercaptopyrene and intermediate compound thereof
CN103739541B (en) The preparation method of 5,6-dihydro-3-(4-morpholinyl)-1-[4-(2-oxo-piperidino) phenyl]-2 (1H)-pyridones
CN114539285A (en) A kind of preparation method of mabaloxavir
CN102731368A (en) Preparation method of 5,5-difluoro-3-substituted piperidine derivative
WO2015012271A1 (en) Method for producing heterocyclic compound
KR20130054250A (en) A process for the preparation of highly pure ambrisentan
CN103012261A (en) Method for preparing montelukast sodium and intermediate of montelukast sodium
CN116332935B (en) Synthesis method of folic acid
CN116813505A (en) A method for preparing O-methyl-N-benzyloxycarbonyl-L-homoserine
CN113698392B (en) A preparation method of Prunster intermediate
CN111574463A (en) Riagliptin intermediate compound IV
CN108689957A (en) A kind of preparation method and application of 2R/2S- trifluoromethyls morpholine and its hydrochloride
JPS62187467A (en) Novel production of 4-acetylisoquinoline compound
CN120309497A (en) A preparation method of nedocromil intermediate
CN102020616B (en) Method for preparing 2-(3-oxo-morpholine) acetonitrile
US20050165054A1 (en) Process for the preparation of quinoline derivatives

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111221

Termination date: 20180401