CN1680374A - Novel synthesis and crystallization of piperazine ring-containing compounds - Google Patents
Novel synthesis and crystallization of piperazine ring-containing compounds Download PDFInfo
- Publication number
- CN1680374A CN1680374A CNA2005100042895A CN200510004289A CN1680374A CN 1680374 A CN1680374 A CN 1680374A CN A2005100042895 A CNA2005100042895 A CN A2005100042895A CN 200510004289 A CN200510004289 A CN 200510004289A CN 1680374 A CN1680374 A CN 1680374A
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- CN
- China
- Prior art keywords
- mirtazapine
- phenyl
- methyl
- piperazine
- solvent
- Prior art date
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- Pending
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- 150000001875 compounds Chemical class 0.000 title abstract description 17
- 125000004193 piperazinyl group Chemical group 0.000 title abstract description 3
- 238000002425 crystallisation Methods 0.000 title description 5
- 230000008025 crystallization Effects 0.000 title description 4
- 230000015572 biosynthetic process Effects 0.000 title description 3
- 238000003786 synthesis reaction Methods 0.000 title description 3
- RONZAEMNMFQXRA-UHFFFAOYSA-N mirtazapine Chemical compound C1C2=CC=CN=C2N2CCN(C)CC2C2=CC=CC=C21 RONZAEMNMFQXRA-UHFFFAOYSA-N 0.000 claims abstract description 78
- 229960001785 mirtazapine Drugs 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000001953 recrystallisation Methods 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 52
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 41
- 239000002904 solvent Substances 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 24
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 15
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 14
- 239000012043 crude product Substances 0.000 claims description 13
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 abstract description 42
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 12
- 238000002360 preparation method Methods 0.000 abstract description 10
- 230000003301 hydrolyzing effect Effects 0.000 abstract 2
- FEIACFYXEWBKHU-UHFFFAOYSA-N (2-aminopyridin-3-yl)methanol Chemical compound NC1=NC=CC=C1CO FEIACFYXEWBKHU-UHFFFAOYSA-N 0.000 abstract 1
- KUSNCWLQRVMIRN-UHFFFAOYSA-N 2-chloro-n-(2-chloroethyl)-n-methyl-2-phenylethanamine Chemical compound ClCCN(C)CC(Cl)C1=CC=CC=C1 KUSNCWLQRVMIRN-UHFFFAOYSA-N 0.000 abstract 1
- PYZPABZGIRHQTA-UHFFFAOYSA-N [2-(4-methyl-2-phenylpiperazin-1-yl)pyridin-3-yl]methanol Chemical compound C1N(C)CCN(C=2C(=CC=CN=2)CO)C1C1=CC=CC=C1 PYZPABZGIRHQTA-UHFFFAOYSA-N 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 24
- 238000010992 reflux Methods 0.000 description 23
- 150000002825 nitriles Chemical class 0.000 description 21
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000003513 alkali Substances 0.000 description 15
- -1 piperazine ring compound Chemical class 0.000 description 13
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 12
- 239000011541 reaction mixture Substances 0.000 description 12
- 235000001968 nicotinic acid Nutrition 0.000 description 11
- 239000011664 nicotinic acid Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 description 8
- 239000003153 chemical reaction reagent Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- VSAISIQCTGDGPU-UHFFFAOYSA-N phosphorus trioxide Inorganic materials O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 4
- 238000007363 ring formation reaction Methods 0.000 description 4
- 239000011877 solvent mixture Substances 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000006704 dehydrohalogenation reaction Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229910001950 potassium oxide Inorganic materials 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XDJWZONZDVNKDU-UHFFFAOYSA-N 1314-24-5 Chemical compound O=POP=O XDJWZONZDVNKDU-UHFFFAOYSA-N 0.000 description 2
- FFNVQNRYTPFDDP-UHFFFAOYSA-N 2-cyanopyridine Chemical compound N#CC1=CC=CC=N1 FFNVQNRYTPFDDP-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical group FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002841 Lewis acid Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical class CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000000010 aprotic solvent Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Chemical group BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 208000024732 dysthymic disease Diseases 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Chemical group 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 150000007517 lewis acids Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- IRMBVBDXXYXPEW-UHFFFAOYSA-N 1-methyl-3-phenylpiperazine Chemical compound C1N(C)CCNC1C1=CC=CC=C1 IRMBVBDXXYXPEW-UHFFFAOYSA-N 0.000 description 1
- DBHXNJNEECWGSO-UHFFFAOYSA-N 11h-pyrido[2,3-c][2]benzazepine Chemical class C1=NC2=NC=CC=C2CC2=CC=CC=C21 DBHXNJNEECWGSO-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 229910015900 BF3 Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229940087098 Oxidase inhibitor Drugs 0.000 description 1
- 229940123445 Tricyclic antidepressant Drugs 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 230000001430 anti-depressive effect Effects 0.000 description 1
- 239000000935 antidepressant agent Substances 0.000 description 1
- 229940005513 antidepressants Drugs 0.000 description 1
- VMPVEPPRYRXYNP-UHFFFAOYSA-I antimony(5+);pentachloride Chemical compound Cl[Sb](Cl)(Cl)(Cl)Cl VMPVEPPRYRXYNP-UHFFFAOYSA-I 0.000 description 1
- 150000001538 azepines Chemical class 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 239000012442 inert solvent Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical group II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Chemical group 0.000 description 1
- 239000011630 iodine Chemical group 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010641 nitrile hydrolysis reaction Methods 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000008194 pharmaceutical composition Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229940023942 remeron Drugs 0.000 description 1
- 229940124834 selective serotonin reuptake inhibitor Drugs 0.000 description 1
- 239000012896 selective serotonin reuptake inhibitor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000003029 tricyclic antidepressant agent Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/55—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/24—Antidepressants
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
- C07D471/12—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains three hetero rings
- C07D471/14—Ortho-condensed systems
Abstract
The present invention is directed to methods for the preparation of piperazine ring-containing compounds, particularly mirtazapine. According to the present invention, the mirtazapine intermediate 1-(3-carboxypyridyl-2)-4-methyl-2-phenyl-piperazine is made by hydrolyzing 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine with a base where the base is present in a ratio of up to about 12 moles of the base per one mole of 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine. The mirtazapine intermediate 1-(3-carboxypyridly-2)-4-methyl-2-phenyl-piperazine may be made by hydrolyzing 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine with potassium hydroxide at a temperature of at least about 130 DEG C. The method of the present invention also includes reacting 2-amino-3-hydroxymethyl pyridine with N-methyl-1-phenyl-2, 2'-iminodiethyl chloride to form 1-(3-hydroxymethylpyridyl-2)-4-methyl-2-phenyl piperazine, and adding sulfuric acid to the 1-(3-hydroxymethylpyridyl-2)-phenyl-4-methylpiperazine to form mirtazapine. The present invention also relates to new processes for recrystallization of mirtazapine form crude mirtazapine.
Description
The application is that application number is 00807574.3 (PCT/US00/10357), the applying date to be the dividing an application of application for a patent for invention on April 18th, 2000.
The cross-reference of related application
The application requires US provisional application 60/130,047 (submission on April 19th, 1999) as basis for priority.
The field of the invention
It is synthetic to the present invention relates to organic chemistry, particularly relates to and contains the piperazine ring compound, as synthesizing of mirtazapine, and relates to mirtazapine different solvents and solvent systems crystallization.
Background of invention
Mirtazapine is 1,2,3,4,10, and 14b-six hydrogen-2-methylpyrazine is [2,1-a] pyrido [2,3-c] [2] benzazepines also, and structure is formula I:
This material is ratified by FDA (Food and Drug Adminstration), and trade mark is Remeron , is used for the treatment of dysthymia disorders.Mirtazapine has the Fourth Ring structure, and is different with the depression agent of other type, as is different from selective serotonin reuptake inhibitor, tricyclic antidepressants antidepressant or oxidase inhibitor.Mirtazapine belongs to piperazine and azepines compounds.
Mirtazapine can prepare with U.S. Patent No. 4,062,848 disclosed methods.According to U.S. Patent No. 4,06 2, the method for 848 (" 848 patents "), (preparation of 3-4-hydroxymethylpiperidine base-2-4-methyl-2-phenyl-Piperazine is from 2 to mirtazapine intermediate 1-, and the 3-substituted pyridine derivative begins.Therefore, shown in synthetic route 1, when from 2-amino-when 3-cyano group-pyridine begins to prepare, the method for " 848 patent " needed for 4 steps could synthesize mirtazapine.It is less to need a kind of step, therefore only needs to consume less reagent, solvent and time method and prepares mirtazapine.
Synthetic route 1
2-amino-3 N-methyl isophthalic acid-phenyl-1-(3-cyano-methyl-pyridyl base-2)-
-cyanopyridine 2,2 '-imino-diacetic ethyl muriate 4-methyl-2-phenyl-Piperazine
1-(3-carboxymethyl pyridyl-2)-1-(3-4-hydroxymethylpiperidine base-2)-
4-methyl-2-phenyl-Piperazine 4-methyl-2-phenyl-Piperazine mirtazapine
According to U.S. Patent No. 4,062, the method of 848 (" 848 patents "), the preparation of mirtazapine intermediate 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine be under strong alkaline condition (every mole nitrile with 25 moles of hydrogen potassium oxides) with nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine hydrolysis, reaction is at high temperature carried out, and reaction reaches 24 hours.Because severe reaction conditions, when purifying products therefrom and processing reaction waste (neutralize and handle a large amount of concentrated alkali solutions), need do a lot of work.Highly basic condition and long reaction times make with the method expense of " 848 patent " very high, especially time in reactor and expense.
According to U.S. Patent No. 4,062,848 method, crude product mirtazapine recrystallization can only carry out in ether and sherwood oil 40-60, and for scale operation, solvent ether and sherwood oil 40-60 all are difficult to handle.
Brief summary of the invention
The invention provides a kind of method for preparing mirtazapine, may further comprise the steps: formula
With formula
The compound reaction forms following formula
Compound, and in following formula: compound, add a kind of closed loop reagent,
Form mirtazapine, wherein R
1Be selected from methylol, chloromethyl, brooethyl and iodomethyl; R
2Be amine; R3 is selected from chlorine, fluorine, bromine and iodine.
A preferred embodiment of the present invention provides a kind of method for preparing mirtazapine, comprise 2-amino-3-4-hydroxymethylpiperidine and N-methyl isophthalic acid-phenyl-2,2 '-reaction of imino-diacetic ethyl muriate, form 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenylpiperazine, in 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine, add sulfuric acid, form mirtazapine.
In addition, the preparation of having found mirtazapine intermediate 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine can be hydrolyzed nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine with new comparatively ideal reaction conditions.This new reaction condition comprises the mol ratio and short reaction times of low potassium hydroxide to nitrile among the present invention.
The present invention relates to prepare a kind of improved method of 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine, promptly pass through 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine hydrolysis, reactions steps comprises reacts 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine and a kind of alkali, and wherein the ratio of alkali is that every mole of 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine is used 12 mol alkali at most.
In a preferred embodiment of the present invention, alkali is about 12 to 1 to 9 to 1 to the mol ratio of 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine.
In the another preferred embodiment of the present invention, alkali is potassium hydroxide or sodium hydroxide.
In the another embodiment of the present invention, the mixture of 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine and alkali is heated to about 130 ℃ at least.
In another embodiment, the hydrolysis of 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine is carried out in the mixture of water and a kind of solvent, and solvent is selected from methyl alcohol, ethanol, propyl alcohol, Virahol, butanols, dimethyl formamide, N,N-DIMETHYLACETAMIDE and dimethyl sulfoxide (DMSO).
The present invention relates to from the crude product mirtazapine, prepare improving one's methods of mirtazapine, comprise the mixture of step (a) heating mirtazapine and solvent; (b) separate mirtazapine.
In preferred embodiment of the present invention, water is added in the mixture of the mirtazapine of heating and solvent, mirtazapine is beneficial to separates out.
In another embodiment, preferred solvent is methyl alcohol, ethanol, Virahol, acetone, toluene and hexane and their mixture.
In another embodiment, preferred solvent is toluene, hexane and methylene dichloride.
Detailed Description Of The Invention
The present invention relates to contain the compound of piperazine ring, as the new preparation process of mirtazapine, as described in following synthetic route 2.Method of the present invention is better than prior art, compares with selectable other method, and particularly productive rate is higher, reactions steps is less and reduced the expense of raw material.
Synthetic route 2
Mirtazapine
More particularly, the present invention relates to the method for III and IV compound mirtazapine from formula II.In the method for the invention, the formula II compound of said synthesis route 2, wherein R
1Be methylol, chloromethyl, brooethyl or iodomethyl, R
2Be amine, preferably-NH2, with the formula III compound reaction of said synthesis route 2, wherein R
3Be chlorine, fluorine, bromine or iodine, form formula IV compound, wherein R
1Definition as above.
In the method for the present invention, formula II compound is dissolved in a kind of solvent, in methylene dichloride, the formula III compound is added in the solvent mixture mixture that heating is produced.Preferably, be the reflux temperature that is heated to solvent.This mixture is heated and forms formula IV compound.Then formula IV compound is carried out ring-closure reaction, generate mirtazapine.Formula IV compound carries out ring-closure reaction and can carry out with a kind of closed loop reagent.Suitable closed loop reagent is dehydration or dehydrohalogenation reagent.The dehydration or the dehydrohalogenation reagent that are used for this purpose adding reaction mixture comprise acid, as sulfuric acid, the vitriol oil, concentrated hydrochloric acid, trifluoroacetic acid, phosphoric acid, Tripyrophosphoric acid (PPA), phosphoryl chloride, phosphorus trioxide, five phosphorus oxide and lewis acid (Lewis acids), as aluminum chloride, iron(ic) chloride, zinc chloride, tin chloride, titanium chloride, boron trifluoride, antimony pentachloride and zirconium tetrachloride.
Particularly preferred dewatering agent is sulfuric acid and phosphoric acid derivatives, as PPA and phosphoryl chloride, the most preferably vitriol oil.Particularly preferred dehydrohalogenation reagent is an aluminum chloride.
In the preferred embodiment of the invention, formula II, III and IV compound are formula II ', III ' and IV ' compound, illustrate respectively in following synthetic route 3.In the one embodiment of the invention, 2-amino-3-4-hydroxymethylpiperidine and N-methyl isophthalic acid-phenyl-2,2 '-reaction of imino-diacetic ethyl muriate, form 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine.In the present invention, 2-amino-3-4-hydroxymethylpiperidine (II ') is added in a kind of solvent, The suitable solvent comprises 1,2-ethylene dichloride, methylene dichloride, dimethyl formamide, N,N-DIMETHYLACETAMIDE and dimethyl sulfoxide (DMSO).With N-methyl isophthalic acid-phenyl-2,2 '-imino-diacetic ethyl muriate (III ') adds in this solvent mixture, and with the gained mixture heating up.Preferably be heated to the reflux temperature of solvent.Heat this mixture to 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine and form, reaction is carried out fully.The about 6-24 of reasonable time hour.Transfer 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine to mirtazapine through ring-closure reaction then.
The ring-closure reaction of 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine strong dehydration (R '=OH) carry out under the condition, preferably under Heating temperature, carry out.Suitable dewatering agent comprises acid, as sulfuric acid, concentrated hydrochloric acid, trifluoroacetic acid, phosphoric acid, Tripyrophosphoric acid (PPA), phosphoryl chloride, phosphorus trioxide and five phosphorus oxide.Particularly preferred dewatering agent is sulfuric acid and phosphoric acid derivatives, as PPA and phosphoryl chloride, the most preferably vitriol oil.
Synthetic route 3
2-amino-3-hydroxyl N-methyl isophthalic acid-phenyl-2,2 '-imido 1-(3-4-hydroxymethylpiperidine base-2)-mirtazapine
Picolyl diethylammonium chloride 4-methyl-2-phenyl-Piperazine
The present invention also provides a kind of and has prepared the novel method of mirtazapine intermediate 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine from nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine, wherein said nitrile (i) is by basic hydrolysis, and the molar ratio of used alkali and nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine is lower; (ii) with short reaction times hydrolysis.
The invention provides the improved method for preparing mirtazapine intermediate 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine, nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine is dissolved in the mixture of a kind of water and organic solvent.Preferred organic comprises polar proton inert solvent and alcohol.Polar protic inert organic solvents such as dimethyl formamide, N,N-DIMETHYLACETAMIDE and dimethyl sulfoxide (DMSO) etc. are preferred.Preferred alcohol is methyl alcohol, ethanol, propyl alcohol, Virahol, butanols etc.With an amount of alkali, add in the reaction mixture as potassium hydroxide or sodium hydroxide.A certain amount of alkali, as potassium hydroxide or sodium hydroxide, every mole of nitrile than no more than 12 mol alkali (as 12: 1 KOH: be preferred nitrile).Alkali, as potassium hydroxide, amount be 9 mol alkali in molar ratio approximately than 1 mole of nitrile (9: 1KOH: nitrile) to 12 moles of hydrogen potassium oxides than 1 mole of nitrile (12: 1KOH: nitrile) for preferred.
In the present invention, at least 130 ℃, preferred temperature of reaction is at about 130-150 ℃ with the mixture heating up of nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine, solvent and alkali.In one embodiment of the invention, reaction can be carried out adding to depress, with the temperature that is easy to reach high.At least 3 normal atmosphere preferably.More preferably, pressure is at least 3-4 normal atmosphere.The reacting by heating mixture is finished up to reaction.Available HPLC detection reaction is finished.Nitrile hydrolysis reactor is finished the required time and is changed with temperature of reaction.The common required reaction times of comparatively high temps is shorter, and often needs the longer reaction times than low reaction temperatures.Though the present invention is the limited reactions time not, preferred about 2-8 of reaction times hour.In a single day reaction is finished, with the pH reduction of reaction mixture, preferably reduce to about 6-7.Preferably, reduce pH with hydrochloric acid.Washing and filter reaction mixture separate mirtazapine intermediate 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine.
In another embodiment, mixture heating up with nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine and potassium hydroxide, and with the water of minimum, as the about 0.25-1mL water of every gram KOH and a small amount of aprotic solvent, as dimethyl formamide, N,N-DIMETHYLACETAMIDE and dimethyl sulfoxide (DMSO),,, under very high concentrations or almost pure condition, under atmospheric pressure react with about 0.1-0.5 gram aprotic solvent as every gram nitrile.Washing and filter reaction mixture separate mirtazapine intermediate 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine.
The present invention obviously reduces the potassium hydroxide consumption from the novel method that nitrile 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine prepares mirtazapine intermediate 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine, is reduced to 1 mole of nitrile with 12 moles or potassium hydroxide still less from every mole of nitrile of " 848 patent " method with 25 moles of hydrogen potassium oxides.Reducing the amount of required alkali has obviously simplified the aftertreatment work of reaction and has reduced environmental problem.
The present invention also provides a kind of novel method for preparing pure mirtazapine with the recrystallization purifying crude product.After 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine closed loop forms mirtazapine, just can carry out mirtazapine crude product recrystallization and purifying.
Have been found that usual vehicle, can be used for mirtazapine crude product recrystallization as toluene or methylene dichloride and solvent systems such as alcohol-water.According to the present invention, the mirtazapine crude product is suspended in the appropriate solvent.Preferred solvent comprises the mixture of first, ethanol, Virahol, acetone and these solvents, or the mixture of one or more these solvents and water.Other preferred solvent also comprises toluene, hexane, methylene dichloride.Even more preferably water and alcoholic acid solvent mixture.The preferred proportion of solvent mixture is an ethanol: water is about 1: 1-1: 4.
In the present invention, the suspension of crude product mirtazapine and solvent is heated to suitable temperature, suitable temperature comprises, as, the reflux temperature of solvent for use system in the arbitrary special embodiment of the present invention.As, when using toluene as solvent in one embodiment of the invention, suitable temperature is about 110 ℃.During the reaction mixture cooling, the mirtazapine of purifying promptly is settled out.Filter the also throw out of dry gained, obtain the recrystallization mirtazapine of purifying.
In another embodiment, the crude product mirtazapine is suspended in a kind of solvent such as the ethanol, heats this mixture, drip water then,, be easy to make the mirtazapine precipitation the solution cooling to refluxing.This throw out of purifying washs and the dry mirtazapine that obtains purifying after filtration.The crystalline mirtazapine can be a kind of water adducts, and water-content can reach 3% (3%w/w).
Solvent of the present invention and solvent systems are suitable for extensive reaction, are more suitable for extensive reaction than ether or sherwood oil 40-60.In addition, during with solvent systems of the present invention, crystalline output also improves a lot.
Mirtazapine and mirtazapine intermediate 1-(3-cyanopyridine-based-2)-4-methyl-2-phenyl-Piperazine and 1-(3-carboxyl pyridine base-2)-4-methyl-2-phenyl-Piperazine, each contains an asymmetric carbon atoms, therefore, except racemic modification, can also prepare optical isomer respectively.Just as comprising that racemic mixture is the same, method of the present invention also comprises these optical isomers.
According to the present invention, the prepared mirtazapine of method of the present invention can be made the pharmaceutical composition that is exclusively used in the treatment dysthymia disorders, and such composition is made up of with medicine acceptable carrier well known to those skilled in the art and/or vehicle the mirtazapine of therapeutically effective amount.
Embodiment
The purpose of the embodiment that below provides is explanation the present invention, and is not interpreted as the qualification to the scope of the invention or spirit.
Embodiment 1
The preparation of 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine
A mechanical stirrer is installed in a 50ml three-necked bottle, a condenser and a thermometer, 1g (0.008 mole) 2-amino-3-4-hydroxymethylpiperidine and 20ml1 packs into, the 2-ethylene dichloride, reactant begins to mix, and add in this suspension 2.8g (0.012 mole) N-methyl isophthalic acid-phenyl-2,2 '-imino-diacetic ethyl-muriate.Reaction mixture is heated to backflow (～80 ℃), and under this temperature, kept 6 hours.
After 6 hours, with the reaction mixture cooling, remove under anhydrous distillation condition and desolvate (1, the 2-ethylene dichloride), obtain yellow powder, it contains 1.8g1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine (productive rate 80%).This powder can be used for preparing mirtazapine, need not to be further purified.
Embodiment 2
The preparation mirtazapine
A mechanical stirrer, a condenser and a thermometer are installed in a 50ml three-necked bottle.1.8g 1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine is added in the vitriol oil that 5ml is cooled to 10 ℃ in advance.The solution of mixed at room temperature gained 4 hours, heated then 1 hour to about 50～60 ℃.After the cooling, under with strong aqua or sodium hydroxide mixing and neutral condition, reactant is added in the 25g ice.Isolate formed precipitation after filtration.The mother liquor reduction vaporization is extremely done.The remnant of gained in formed precipitation and the mother liquor is suspended in respectively in the 20ml Virahol.The isopropanol extraction liquid that evaporation merges is to doing.Obtain an oily matter, it contains 1.35g mirtazapine (productive rate 80%).
Embodiment 3
The preparation mirtazapine
1-(3-4-hydroxymethylpiperidine base-2)-4-methyl-2-phenyl-Piperazine (1.8g) is added in about 5ml vitriol oil, and gained solution mixed 6 hours at 35 ℃.After the cooling,, reactant is added in the 25g ice mixing with strong aqua or sodium hydroxide and alkalizing to the condition of pH=10.With the isolated precipitation of dichloromethane extraction, evaporate this extracting solution to doing, obtain 1.6g mirtazapine (productive rate 95%).
Embodiment 4
Preparation 1-(3-carboxyl pyridine base-2-)-4-methyl-2-phenyl-Piperazine
With 1-(3-is cyanopyridine-based-2-)-4-methyl-2-phenyl-Piperazine (54g) is dissolved in 340ml ethanol and the 34ml water.The solid potassium hydroxide that adds 85% (113g), reacting by heating mixture to 140 ℃ in high pressure vessel.Pressure is increased to 3-4 normal atmosphere, under this pressure, reaction mixture is kept mixing 5 hours.After 5 hours, cool off this reaction mixture, from reaction mixture, remove ethanol under reduced pressure, add fresh water and toluene, make to be divided into two-phase.With in the hydrochloric acid (HCl) and the aqueous solution to pH=6.5-7.When pH=6.5-7, evaporation water outlet, and add toluene filters out inorganic salt, toluene solution is evaporated to dried, draws 52g 1-(3-carboxyl pyridine base-2-)-4-methyl-2-phenyl-Piperazine (productive rate: 90%).
Embodiment 5
Preparation 1-(3-carboxyl pyridine base-2-)-4-methyl-2-phenyl-Piperazine
With solid potassium hydroxide (150g, 85%) and 75ml water and 6.5g DMSO add to 1-(3-is cyanopyridine-based-2-)-4-methyl-2-phenyl-Piperazine (54g) in, reaction mixture is heated to 145-150 ℃ and mixed 8 hours.After 8 hours, tell the mutually inorganic of moisture and potassium hydroxide, will mainly contain the organic phase cooling of oily product.Add fresh water and toluene, tell two-phase.With in the hydrochloric acid and the aqueous solution to pH=6.5-7.When pH=6.5-7, evaporation removes and anhydrates, and adds toluene.The filtering inorganic salt are evaporated to toluene solution dried, obtain 52g 1-(3-carboxyl pyridine base-2-)-4-methyl-2-phenyl-Piperazine (productive rate: 90%).
Embodiment 6
The recrystallization of mirtazapine
The mirtazapine (20g) that embodiment 2 and 3 is obtained is suspended in the 20ml ethanol and reflux.In solution, drip 40mL water with 1 hour time in the backflow, be cooled to 10 ℃ then.Water: the resulting filter cake of solution washing of ethanol (2: 1), and 60 ℃ of vacuum-dryings.Obtain crystalline mirtazapine 18g, productive rate 90%.
Table 1 has been listed the overview with some other experiment unanimous on the whole of above-mentioned experimentation, and wherein productive rate % refers to the percentage ratio of gained mirtazapine crystallization yield from the crude product mirtazapine, and purity % refers to the percent purity compared with the mirtazapine standard substance.
Table 1 recrystallization method purifying crude product mirtazapine
| Solvent systems | Solvent ratio ml: ml/g | Condition | Productive rate 1????％ |
| Hexane | ????10 | Reflux | ????55 |
| Toluene | ????3 | Reflux | ????32 |
| Toluene | ????2 | Reflux | ????53 |
| Acetone | ????6∶25 | ????25℃ | ????65 |
| Ethanol/water | ????7∶10 | Reflux | ????67 |
| Methanol | ????2.25∶1.5 | Reflux | ????67 |
| Ethanol/water | ????1.5∶2 | Reflux | ????72 |
| Isopropanol | ????1.65∶2 | Reflux | ????60 |
| Acetone | ????3∶2 | Reflux | ????53 |
| Ethanol/water | ????1∶1.3 | Reflux | ????70 |
| Ethanol/water | ????1.3∶1.75 | Reflux | ????90.3 |
| Ethanol/water | ????1∶4 | Reflux | ????100 |
| Ethanol/water | ????1.1∶1.2 | Reflux | ????87.8 |
| Ethanol/water | ????0.8∶0.9 | Reflux | ????90 |
| Ethanol/water | ????0.8∶1 | Reflux | ????57 |
| Ethanol/water | ????0.6∶0.7 | Reflux | ????89.1 |
| Ethanol/water | ????0.35∶0.7 | Reflux | ????91.5 |
| Ethanol/water | ????0.6∶0.69 | Reflux | ????87 |
| Ethanol/water | ????2∶2.8 | Reflux | ????95.6 |
1Mirtazapine crystallization gram number * 100%/mirtazapine crude product gram number * 100%
Though the present invention lists some preferred embodiments at this, to those skilled in the art, obviously can under the situation that does not break away from spirit of the present invention, make change and modification to the embodiment that has provided.Therefore, the present invention only adds the included scope of right claim and applicable law limits by appended.
Claims (6)
1. the method for a recrystallization mirtazapine from the crude product mirtazapine comprises the steps:
(a) with the mixture heating up of crude product mirtazapine and a kind of solvent;
(b) cool off this mixture, so that the mirtazapine of purifying precipitation; With
(c) mirtazapine of separation recrystallization.
2. the described method of claim 1, wherein solvent is selected from the mixture of methyl alcohol, ethanol, Virahol, acetone and these solvents.
3. the described method of claim 2 also comprises in the mixture of mirtazapine and solvent adding entry, is beneficial to the step that mirtazapine is separated out.
4. the described method of claim 1, wherein solvent is selected from the mixture of toluene, hexane and methylene dichloride and these solvents.
5. the described method of claim 2, wherein solvent is an ethanol.
6. the described method of claim 1, wherein the mirtazapine of recrystallization is a mirtazapine water adducts.
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| US13004799P | 1999-04-19 | 1999-04-19 | |
| US60/130047 | 1999-04-19 |
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| CN00807574A Division CN1356903A (en) | 1999-04-19 | 2000-04-18 | Synthesis and crystallization of piperazine ring-contg. compounds |
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| CN00807574A Pending CN1356903A (en) | 1999-04-19 | 2000-04-18 | Synthesis and crystallization of piperazine ring-contg. compounds |
| CNA2005100042895A Pending CN1680374A (en) | 1999-04-19 | 2000-04-18 | Novel synthesis and crystallization of piperazine ring-containing compounds |
| CNA2005100042880A Pending CN1679586A (en) | 1999-04-19 | 2000-04-18 | Novel synthesis and crystallization of piperazine ring-containing compounds |
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| AU6019900A (en) | 1999-11-24 | 2001-06-04 | Sumika Fine Chemicals Co., Ltd. | Anhydrous mirtazapine crystals and process for producing the same |
| AU6474200A (en) * | 1999-12-13 | 2001-06-18 | Sumika Fine Chemicals Co., Ltd. | Process for the preparation of a pyridinemethanol compound |
| US6660730B2 (en) * | 2000-11-27 | 2003-12-09 | Sumika Fine Chemicals Co., Ltd. | Anhydrous mirtazapine and process for preparing the same |
| UA83666C2 (en) | 2003-07-10 | 2008-08-11 | Н.В. Органон | Method for the preparation of enantiomerically pure mirtazapine |
| ES2246161B1 (en) * | 2004-07-22 | 2007-04-01 | Medichem, S.A. | IMPROVED PROCESS FOR THE MANUFACTURE OF MIRTAZAPINE. |
| JP4848704B2 (en) * | 2004-08-24 | 2011-12-28 | 住友化学株式会社 | Process for producing 2- (4-methyl-2-phenylpiperazin-1-yl) -3-cyanopyridine |
| JP5192707B2 (en) | 2007-03-22 | 2013-05-08 | 住友化学株式会社 | Manufacturing method of mirtazapine |
| EP2146993B1 (en) | 2007-04-11 | 2015-08-05 | Merck Sharp & Dohme B.V. | A method for the preparation of mirtazapine |
| US7994314B2 (en) | 2007-04-11 | 2011-08-09 | N.V. Organon | Method for the preparation of an enantiomerically pure benzazepine |
| KR101485418B1 (en) | 2013-05-29 | 2015-01-26 | 주식회사 메디켐코리아 | A synthetic method of high purity mirtazapine |
| JP2017088564A (en) * | 2015-11-13 | 2017-05-25 | 株式会社トクヤマ | Manufacturing method of mirtazapine |
| JP6571497B2 (en) * | 2015-11-13 | 2019-09-04 | 株式会社トクヤマ | Manufacturing method of mirtazapine |
| CN108191873B (en) * | 2018-01-08 | 2021-09-24 | 山东省食品药品检验研究院 | Method for purifying mianserin hydrochloride |
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| HRP20010747A2 (en) | 2002-12-31 |
| HUP0200839A2 (en) | 2002-08-28 |
| CZ20013658A3 (en) | 2002-08-14 |
| TR200103028T2 (en) | 2002-01-21 |
| KR20020019902A (en) | 2002-03-13 |
| WO2000062782A1 (en) | 2000-10-26 |
| CN1680365A (en) | 2005-10-12 |
| JP2004500324A (en) | 2004-01-08 |
| CN1356903A (en) | 2002-07-03 |
| CA2368815A1 (en) | 2000-10-26 |
| HUP0200839A3 (en) | 2003-05-28 |
| IL146023A0 (en) | 2002-07-25 |
| ZA200108220B (en) | 2006-02-26 |
| SK14672001A3 (en) | 2002-11-06 |
| RU2001128229A (en) | 2003-07-10 |
| CN1679586A (en) | 2005-10-12 |
| HK1044116A1 (en) | 2002-10-11 |
| YU74101A (en) | 2004-09-03 |
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