CN1580059A - 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazine-1,1-dioxide-3 - Google Patents

6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazine-1,1-dioxide-3 Download PDF

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CN1580059A
CN1580059A CN 03142015 CN03142015A CN1580059A CN 1580059 A CN1580059 A CN 1580059A CN 03142015 CN03142015 CN 03142015 CN 03142015 A CN03142015 A CN 03142015A CN 1580059 A CN1580059 A CN 1580059A
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methyl
formula
reaction
ethyl
chloro
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CN1266155C (en
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樊伟明
翁杭辉
丁建明
任秉钧
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ZHEJIANG ZHENYUAN PHARMACEUTICAL CO Ltd
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ZHEJIANG ZHENYUAN PHARMACEUTICAL CO Ltd
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Priority to PCT/CN2004/000792 priority patent/WO2005016937A1/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D513/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00
    • C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
    • C07D513/04—Ortho-condensed systems

Abstract

The invention discloses a preparation method of 6-chlorine-4-hydroxyl-2-methyl-2H-thieno (2,3-e)-1,2-thiazine-1,1-dioxide-3-carboxylic ester demonstrated by the figure 3 and the method includes the following steps: (a) choose the magnesium alkoxy as the alkali cyclization agent and cyclizate the compound of the figure 4 in the organic solvent and at the reaction temperature of between 40deg.C and 157deg.C; (b) separate the compound of the figure 3 from the mixture. The invention can increase the yield remarkably.

Description

6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazines-1, the synthetic method of 1-dioxide-3-carboxylicesters
Technical field
The present invention relates to the synthetic method of non-steroidal anti-inflammatory analgesics " lornoxicam " key intermediate (lornoxicam), more specifically relate to 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-and 1,2-thiazines-1, the synthetic method of 1-dioxide-3-carboxylicesters.
Technical background
At present, having gone on the market both at home and abroad with " lornoxicam " is that the tablet of activeconstituents and freeze-dried preparation are in order to treatment rheumatoid arthritis, osteoarthritis and postoperative various pain.Its outstanding analgesic effect can compare favourably with morphine, U-26225A commonly used clinically.
Clinical study to this product is both at home and abroad also increasing to some extent along with the good gradually of its market outlook.Yet because the chemosynthesis difficulty of the key intermediate of " lornoxicam " is bigger, the relevant synthetic document of publishing both at home and abroad also is a phoenix feathers and unicorn horns.
U.S. Pat 4,180,662 disclose a kind of method for making, this method is a raw material with 5-chloro-3-(N-methoxycarbonyl methylene radical-N-methyl)-aminosulfonyl thiophene-2-carboxylic acid methyl esters (formula 2), and ring-closure reaction is carried out in heating in containing the methanol solution of sodium methylate, after question response finishes, separate and obtain 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-and 1,2-thiazines-1,1-dioxide-3-carboxylate methyl ester (formula 1).Yet in above building-up process, the generating capacity of side reaction is very big, and the reaction soln color is very dark, causes last yield very low, and molar yield only is about 24%.
Therefore, this area press for the high preparation 6-chloro-4-hydroxy-2-methyl-2H-thieno-of the new yield of exploitation (2,3-e)-1,2-thiazines-1, the method for 1-dioxide-3-carboxylicesters.
Summary of the invention
The purpose of this invention is to provide a kind of prepare with high yield 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazines-1, the method for 1-dioxide-3-carboxylicesters.
The inventor is extensive studies through going deep into, and thinks that the low alkalescence with alkaline cyclization reagent sodium methylate of existing production method yield has direct relation too by force.According to the ordinal relation of metal active power, the elemental metals poorer slightly than sodium Metal 99.5 with metal active replaces sodium Metal 99.5, and the alkaline cyclization reagent of making can obtain result preferably.By reducing the alkalescence of the cyclization reagent that uses in the ring-closure reaction, for example replace organic sodium reagent with organomagnesium reagent, in alcoholic solvent, carry out ring-closure reaction, can improve the yield of reaction greatly.
For these reasons, the invention provides a kind of prepare 6-chloro-4-hydroxy-2-methyl-2H-thieno-that general formula is a formula 3 (2,3-e)-1,2-thiazines-1, the method for 1-dioxide-3-carboxylicesters,
Figure A0314201500051
In the formula, R 1Be C 1-C 4Alkyl;
This method comprises:
(a) with the alkoxyl magnesium of formula 5 as alkaline cyclizing agent, under organic solvent and 40 ℃ of-157 ℃ of temperature of reaction,
(R 2O) 2Mg
5
In the formula, R 2Be C 1-C 6Alkyl;
Make the compound cyclization of formula 4,
In the formula, R 3And R 4Represent C respectively 1-C 4Alkyl;
(b) from reaction mixture, isolate formula 3 compounds.
The inventive method uses alkoxyl magnesium can reduce the generation of side reaction as alkaline cyclization, thereby greatly improves the yield of formula 3 compounds, and then the production cost of reduction formula 3 compounds.
Embodiment
The invention provides a kind of method of synthesis type 3 compounds, it comprises step: (a) with alkoxyl magnesium as alkaline cyclizing agent, in organic solvent, make corresponding formula 4 compound cyclizations, form formula 3 compounds, (b) separate obtaining formula 3 compounds then.
In aforesaid method, the general formula of formula 3 compounds is:
Figure A0314201500062
Wherein, R 1Be selected from C 1-C 4Alkyl.Preferably, R 1Select white methyl, ethyl, propyl group and butyl; More preferably, R 1Be methyl and ethyl.
The general formula of formula 4 compounds is:
R wherein 3And R 4Be selected from C respectively 1-C 4Alkyl.Preferably, R 3And R 4Be selected from methyl, ethyl, propyl group and butyl respectively; More preferably, R 3And R 4Be respectively methyl and ethyl.
Alkoxyl magnesium can be represented with formula 5:
(R 2O) 2Mg
5
R wherein 2Be selected from C 1-C 6Alkyl.Preferably, R 2Be selected from methyl, ethyl, propyl group, butyl, amyl group and basic; More preferably, R 2Be selected from methyl, ethyl, propyl group and butyl; Best, R 2Be methyl, ethyl sec.-propyl and n-propyl.
The preparation of described alkoxyl magnesium can followingly be carried out, promptly by elemental metals magnesium and excessive C 1-C 6Alcohol is in that to be higher than under the temperature of room temperature reaction synthetic.In a preferred embodiments of the present invention, described temperature prioritised be this pure reflux temperature.Described alcohol can be C 1-C 6Monohydroxy-alcohol or contain C 1-C 6The solvent of monohydroxy-alcohol; Preferably, described solvent is preferably singly used C 1-C 6Monohydroxy-alcohol; More preferably, described solvent more preferably is single with methyl alcohol, ethanol, Virahol, n-propyl alcohol.
Solvent of the present invention can also be mainly to comprise C 1-C 6The mixing solutions (being meant that mainly content greater than 70%, is preferably greater than 80%) of alcohol, for example mainly comprise C 1-C 6The tetrahydrofuran (THF) mixing solutions of alcohol.
Ring-closure reaction step of the present invention (a) is carried out in solvent, the preferred C of used solvent 1-C 6Alcohol (especially monohydroxy-alcohol) or its mixed solvent, can select C for use 1-C 6Monohydroxy-alcohol or contain C 1-C 6The mixed solvent of monohydroxy-alcohol, especially singly use C 1-C 6Monohydroxy-alcohol as solvent, more preferably single with methyl alcohol, ethanol, Virahol, n-propyl alcohol as solvent.
The temperature range of ring-closure reaction is not particularly limited, and is common between the reflux temperature of 40 ℃ of extremely selected solvents, especially C 6The reflux temperature of alcohol can reach 157 ℃.Preferably, the scope of temperature of reaction is 40-125 ℃, more preferably is 55-120 ℃, is 60-100 ℃ best.The boiling point of common solvent following (normal pressure):
Solvent Methyl alcohol Ethanol Virahol N-propyl alcohol Butanols Amylalcohol Hexanol
Boiling point (℃) ?64.5 78.3 82.4 97.2 117.7 138.0 157.1
In step (b), the method for available this area routine (as US 4,180, the method described in 662) separate type 3 compounds.A kind of preferred separation method is with methylene dichloride/2N HCl mixing solutions extraction, after dry the concentrating, obtains the crude product of formula 3 compounds.After organic solution (as methyl alcohol) washing, filtration, oven dry, can obtain product.
For isolating product, can following calculated yield:
Yield=(quality product * raw molecule amount)/(raw material charging capacity * molecular weight product) * 100%
Describe the present invention in detail below in conjunction with embodiment, these embodiment just are used for illustration purpose, do not limit the scope of the invention.
Embodiment 1
Preparation 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazines-1,1-dioxide-3-carboxylate methyl ester
Drop into 1500ml methyl alcohol, powdery metal magnesium 19.2g in 2 liters of there-necked flasks, dispersed with stirring post-heating back flow reaction 3 hours makes the methanol solution of gray magnesium methylate.
Then, disposable input 5-chloro-3-(N-methoxycarbonyl methylene radical-N-methyl)-aminosulfonyl thiophene-2-carboxylic acid methyl esters (is pressed US 4,180,662 is synthetic) 160g, be warming up to 65 ℃ of reactions, detect to product content with HPLC (Alltima C185u Length 150mm) and no longer rise to reaction end (about 12 hours).
Reaction is finished, and pours 1500ml 2N HCl and 800ml CH after the cooling into 2Cl 2In the mixed solution of forming, organic phase is got in layering.With 2 * 100ml CH 2Cl 2Aqueous phase extracted after the merging organic phase, is used anhydrous Na 2SO 4Dry.Filter, concentrate back gained solid and soak with methyl alcohol, dry after the filtration light yellow crystalline solid 112g, yield 77.2%, 200 ℃-202 ℃ of fusing points conform to the melting point values of title compound.
Embodiment 2
Preparation 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazines-1,1-dioxide-3-carboxylate methyl ester
Drop into 1600ml ethanol, powdery metal magnesium 19.2g in 2 liters of there-necked flasks, methyl iodide 0.5ml, back flow reaction is 3 hours after the dispersed with stirring, makes the gray ethanolic soln that contains magnesium ethylate.
Disposable then input 5-chloro-3-(N-methoxycarbonyl methylene radical-N-methyl)-aminosulfonyl thiophene-2-carboxylic acid methyl esters 160g is warming up to 80 ℃ of reactions, detects to product content with HPLC and no longer rises to reaction end.
Reaction is finished, and pours 2000ml 2N HCl and 800ml CH after the cooling into 2Cl 2In the mixed solution of forming, get organic phase.With 2 * 100mlCH 2Cl 2Aqueous phase extracted merges organic phase.The organic phase anhydrous Na 2SO 4Dry.The gained solid soaks with methyl alcohol after concentrate doing organic phase, dry light yellow crystalline solid 84g, yield 58%, 200 ℃-202 ℃ of fusing points.
Embodiment 3
Preparation 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazines-1,1-dioxide-3-carboxylate methyl ester
Drop into 1600ml Virahol, powdery metal magnesium 19.2g in 2 liters of there-necked flasks, methyl iodide 1.5ml, back flow reaction is 3 hours after the dispersed with stirring, makes the gray aqueous isopropanol that contains magnesium isopropoxide.
Disposable then input 5-chloro-3-(N-methoxycarbonyl methylene radical-N-methyl)-aminosulfonyl thiophene-2-carboxylic acid methyl esters 160g is warming up to about 95 ℃ reaction, detects to product content with HPLC and no longer rises to reaction end.
Reaction is finished, and pours 2000ml 2N HCl and 800ml CH after the cooling into 2Cl 2In the mixed solution of forming, get organic phase.With 2 * 100mlCH 2Cl 2Aqueous phase extracted merges organic phase.The organic phase anhydrous Na 2SO 4Dry.The gained solid is with methanol crystallization after concentrate doing organic phase, dry light yellow crystalline solid 60.9g, yield 42%, 200 ℃-202 ℃ of fusing points.
As described above, the molar yield of compound 1 has only 24% in the prior art, and the molar yield of compound 1 reaches as high as 77.2% among the present invention, has improved compared to existing technology more than 3 times, thereby has greatly reduced production cost, has very large application prospect.

Claims (10)

  1. One kind prepare 6-chloro-4-hydroxy-2-methyl-2H-thieno-that general formula is a formula 3 (2,3-e)-1,2-thiazines-1, the method for 1-dioxide-3-carboxylicesters,
    In the formula, R 1Be C 1-C 4Alkyl;
    It is characterized in that the method comprising the steps of:
    (a) with the alkoxyl magnesium of formula 5 as alkaline cyclizing agent, under organic solvent and 40 ℃ of-157 ℃ of temperature of reaction,
    (R 2O) 2Mg
    5
    In the formula, R 2Be C 1-C 6Alkyl;
    Make the compound cyclization of formula 4,
    Figure A031420150002C2
    In the formula, R 3And R 4Represent C respectively 1-C 4Alkyl;
    (b) from reaction mixture, isolate formula 3 compounds.
  2. 2. the method for claim 1 is characterized in that, described R 1, R 3, R 4Be selected from methyl, ethyl, propyl group and butyl respectively.
  3. 3. method as claimed in claim 2 is characterized in that, described R 1, R 3, R 4Be selected from methyl and ethyl respectively.
  4. 4. the method for claim 1 is characterized in that, described R 2Be selected from methyl, ethyl, propyl group, butyl, amyl group and hexyl.
  5. 5. method as claimed in claim 4 is characterized in that, described R 2Be selected from methyl, ethyl, propyl group and butyl.
  6. 6. method as claimed in claim 4 is characterized in that, described R 2Be selected from methyl, ethyl, sec.-propyl and n-propyl.
  7. 7. the method for claim 1 is characterized in that, described temperature of reaction is 40-125 ℃.
  8. 8. the method for claim 1 is characterized in that, described temperature of reaction is 60-100 ℃.
  9. 9. the method for claim 1 is characterized in that, described organic solvent is C 1-C 6Monohydroxy-alcohol or its mixed solvent.
  10. 10. the method for claim 1 is characterized in that, the water content of described organic solvent is less than 5%.
CN 03142015 2003-08-01 2003-08-01 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazine-1,1-dioxide-3 Expired - Lifetime CN1266155C (en)

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CN 03142015 CN1266155C (en) 2003-08-01 2003-08-01 6-chloro-4-hydroxy-2-methyl-2H-thieno-(2,3-e)-1,2-thiazine-1,1-dioxide-3
PCT/CN2004/000792 WO2005016937A1 (en) 2003-08-01 2004-07-13 A SYNTHETIC METHOD FOR 6-CHLORO-4-HYDROXY-2-METHYL-2H-THIENO (2,3-e)-1,2-THIAZINE1, 1-DIOXIDE-3-CARBOXYLATE

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102020667A (en) * 2010-09-06 2011-04-20 刘雨林 Method for synthesizing 6-chloro-4-hydroxyl-2-methyl-2H-thieno(2.3.e)-1.2thiazide-1.1-dioxide-3-methyl formate

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US8757213B2 (en) 2011-11-04 2014-06-24 Blue Gentian, Llc Commercial hose
ES2595240T3 (en) 2012-07-09 2016-12-28 Lupin Limited Tetrahydroquinazolinone derivatives as PARP inhibitors
CN106632403B (en) * 2017-01-23 2018-09-11 牡丹江医学院 A kind of operation analgesic antiphlogistic medicine and preparation method thereof

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CA1066711A (en) * 1974-08-26 1979-11-20 Hoffmann-La Roche Limited Thiophene derivatives
AU518216B2 (en) * 1977-09-06 1981-09-17 Hafslund Nycomed Pharma Aktiengesellschaft Thienothiazine derivatives

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102020667A (en) * 2010-09-06 2011-04-20 刘雨林 Method for synthesizing 6-chloro-4-hydroxyl-2-methyl-2H-thieno(2.3.e)-1.2thiazide-1.1-dioxide-3-methyl formate

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