WO1996035682A1 - Procede de preparation d'un derive d'acide benzofurane carboxylique optiquement pur, et son utilisation pour preparer l'efaroxan - Google Patents
Procede de preparation d'un derive d'acide benzofurane carboxylique optiquement pur, et son utilisation pour preparer l'efaroxan Download PDFInfo
- Publication number
- WO1996035682A1 WO1996035682A1 PCT/FR1996/000697 FR9600697W WO9635682A1 WO 1996035682 A1 WO1996035682 A1 WO 1996035682A1 FR 9600697 W FR9600697 W FR 9600697W WO 9635682 A1 WO9635682 A1 WO 9635682A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optically pure
- ethyl
- dihydro
- general formula
- carboxylic acid
- Prior art date
Links
- 0 CC[C@@]1(*)Oc2ccccc2C1 Chemical compound CC[C@@]1(*)Oc2ccccc2C1 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
- C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
- C07D307/82—Benzo [b] furans; Hydrogenated benzo [b] furans with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
- C07D307/84—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
- C07D307/85—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen attached in position 2
Definitions
- the present invention relates to a process for the preparation of an optically pure 2-ethyl-2,3-dihydro-benzofuran-carboxylic acid derivative, the derivative obtained and its use for the preparation of the 2- [2- (2 -ethyl-2,3-dihydro-benzofuranyl)] - 2-imidazoline corresponding optically pure, in particular of efaroxan.
- Derivatives of 2- [2- (2-ethyl-2,3-dihydro-benzofuranyl)] - 2- imidazoline, in particular efaroxan are antagonist derivatives of the ⁇ 2-adrenergic receptors, described in the European patent application
- N ° 0 071 368 (Reckitt & Colman) for the treatment of depression or migraine. They are also described for the treatment of Parkinson's disease and neurodegenerative disorders such as Alzheimer's disease in patent applications WO No. 95/00145 and No. 95/01791 (Pierre Fabre
- the present invention relates to a new process for stereospecific synthesis of optically pure derivatives of 2- [2- (2- (2-ethyl-2,3-dihydro-benzofuranyl)] - 2-imidazoline, of general formula I
- R represents a hydrogen atom, a halogen, a lower alkyl, lower alkoxy or hydroxy radical, from a corresponding optically pure 2-ethyl-2,3-dihydro-benzofuran-carboxylic acid derivative, and the optically pure derivatives obtained by this process.
- the synthesis of the derivatives of general formula I is more particularly described in patent application EP-A-0 071 368, and consists in converting the derivative of 2-ethyl-2,3-dihydro-benzofuran-carboxylic acid into amide of general formula III,
- the present invention therefore relates first of all to the process for preparing the starting acid of general formula II
- R represents a hydrogen atom, a halogen, a lower alkyl, lower alkoxy or hydroxy radical
- suitable optically pure enantiomer of 2-phenylglycinol is meant the enantiomer of the acid allowing good separation of the diastereoisomeric salts obtained, one being more stable than the other, and crystallizing.
- the acid of general formula II of configuration R is obtained, by selective crystallization with S (+) - 2-phenylglycinol and conversely the acid of configuration S with R (-) - 2-phenylglycinol.
- suitable solvent any solvent capable of promoting the selective crystallization of one enantiomeric salt, while keeping the other in solution. It will advantageously be chosen from acetone, ethyl acetate, methyl ethyl ketone and their mixtures.
- Different chiral amines can be used to form a diastereoisomer salt with the acid of general formula II, such as for example ⁇ -methyl-benzyl-amine, or optically active amino-alcohols such as phenylalaninol or prolinol.
- (+) - 2-phenylglycinol is an amino alcohol easily accessible by reduction of S (+) - phenylglycine (Tetrahedron Lett., 1992,
- the present invention also relates to the derivatives of general formula II, optically pure which can be obtained by the above process, in particular the derivatives having an enantiomeric purity greater than or equal to 95%, more particularly greater than 96.5%.
- This acid is transformed into an ester by treatment with SOC 2 / MeOH, then the methyl ester obtained is treated with ammonia to form the amide which, by dehydration with P 2 O 5 in toluene, provides the corresponding nitrile.
- the last stage of the synthesis consists of the preparation of the imidate from the nitrile, by reaction with a catalytic quantity of sodium methylate, which is then treated with ethylenediamine in a solution of isopropanol and hydrochloric acid , to obtain the desired imidazoline.
- the overall yield of the preparation of the dextrorotatory isomer of 2-ethyl-2,3-dihydro-benzofuran-2-carboxylic acid is 50% from its racemic, and the preparation of (+) -2- [2- (2-ethyl-2,3-dihydro-benzofuranyl] -2-imidazoline as hydrochloride is 50%.
- Example 2 (+) -2-ethyl-2,3-dihydro-2-benzofuran-methyl carboxylate The enantiomerically pure acid obtained in Example 1 is treated with
- Example 3 The amide of Example 3 is treated with 5 g of P 2 O 5 in 50 ml of toluene at reflux for 16 h. After decantation, usual extraction, 1.06 g of nitrile is obtained, which is used directly in the next step.
- Example 4 The nitrile obtained in Example 4 (1 g) is placed in ethanol (50 ml) and treated with a catalytic amount of sodium methylate at 0 ° C, then left for 6 days at room temperature.
- TLC 0.582 ml of ethylenediamine is added to the reaction medium followed by a 5N solution of isopronanol saturated with hydrochloric gas. Stirring is continued for 4 days then the reaction mixture is extracted with CH 2 CI 2 and a solution of IN sodium hydroxide, 702 mg of the compound are then obtained in the base form, the hydrochloride of which is formed in ether by addition of 0 , 62 ml of isopropanol, HCl (5N).
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Plural Heterocyclic Compounds (AREA)
- Furan Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU58255/96A AU708894B2 (en) | 1995-05-10 | 1996-05-09 | Process for the preparation of an optically pure benzofurancarboxylic acid derivative and its use for preparing efaroxan |
NZ308581A NZ308581A (en) | 1995-05-10 | 1996-05-09 | Method for preparing an optically pure benzofuran carboxylic acid and use thereof for preparing efaroxan |
AT96919883T ATE190977T1 (de) | 1995-05-10 | 1996-05-09 | Verfahren zur herstellung eines optisch reinen benzofurancarbonsäurederivates und dessen verwendung zur herstellung von efaroxan |
US08/952,133 US5880296A (en) | 1995-05-10 | 1996-05-09 | Method for preparing an optically pure benzofuran carboxylic acid and use thereof for preparing efaroxan |
DE69607341T DE69607341D1 (de) | 1995-05-10 | 1996-05-09 | Verfahren zur herstellung eines optisch reinen benzofurancarbonsäurederivates und dessen verwendung zur herstellung von efaroxan |
JP8533831A JPH11505223A (ja) | 1995-05-10 | 1996-05-09 | 光学的に純粋なベンゾフランカルボキシル酸誘導体を調製するための方法およびエフアロキサン調製のためのその用途 |
EP96919883A EP0824531B1 (fr) | 1995-05-10 | 1996-05-09 | Procede de preparation d'un derive d'acide benzofurane carboxylique optiquement pur, et son utilisation pour preparer l'efaroxan |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9505513A FR2733983B1 (fr) | 1995-05-10 | 1995-05-10 | Procede de preparation d'un derive d'acide benzofurane carboxylque optiquement pur et son utilisation pour preparer l'efaroxan |
FR95/05513 | 1995-05-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996035682A1 true WO1996035682A1 (fr) | 1996-11-14 |
Family
ID=9478824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1996/000697 WO1996035682A1 (fr) | 1995-05-10 | 1996-05-09 | Procede de preparation d'un derive d'acide benzofurane carboxylique optiquement pur, et son utilisation pour preparer l'efaroxan |
Country Status (10)
Country | Link |
---|---|
US (1) | US5880296A (fr) |
EP (1) | EP0824531B1 (fr) |
JP (1) | JPH11505223A (fr) |
AT (1) | ATE190977T1 (fr) |
AU (1) | AU708894B2 (fr) |
CA (1) | CA2221031A1 (fr) |
DE (1) | DE69607341D1 (fr) |
FR (1) | FR2733983B1 (fr) |
NZ (1) | NZ308581A (fr) |
WO (1) | WO1996035682A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2780967A1 (fr) * | 1998-07-13 | 2000-01-14 | Pf Medicament | Procede de preparation de derives du 2,3-dihydrobenzofurane -2,2-disubstitues |
WO2000015624A1 (fr) * | 1998-09-10 | 2000-03-23 | Pierre Fabre Sante, Societe Anonyme | Derive d'ester d'acide 2-ethyl-2,3-dihydrobenzofurane-carboxylique, procede de preparation et utilisation pour la preparation de derives de l'efaroxan |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7745142B2 (en) * | 1997-09-15 | 2010-06-29 | Molecular Devices Corporation | Molecular modification assays |
US20050227294A1 (en) * | 1997-09-15 | 2005-10-13 | Molecular Devices Corporation | Molecular modification assays involving lipids |
US7632651B2 (en) * | 1997-09-15 | 2009-12-15 | Mds Analytical Technologies (Us) Inc. | Molecular modification assays |
US6297018B1 (en) | 1998-04-17 | 2001-10-02 | Ljl Biosystems, Inc. | Methods and apparatus for detecting nucleic acid polymorphisms |
US6982431B2 (en) * | 1998-08-31 | 2006-01-03 | Molecular Devices Corporation | Sample analysis systems |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2102422A (en) * | 1981-07-28 | 1983-02-02 | Reckitt & Colmann Prod Ltd | Imidazoline derivatives |
EP0310745A2 (fr) * | 1984-11-23 | 1989-04-12 | Orion-Yhtymä Oy | Dérivés d'imidazole substitué et leur préparation et utilisation |
WO1992005171A1 (fr) * | 1990-09-14 | 1992-04-02 | Reckitt & Colman Products Limited | Derives d'imidazoline |
-
1995
- 1995-05-10 FR FR9505513A patent/FR2733983B1/fr not_active Expired - Lifetime
-
1996
- 1996-05-09 DE DE69607341T patent/DE69607341D1/de not_active Expired - Lifetime
- 1996-05-09 JP JP8533831A patent/JPH11505223A/ja active Pending
- 1996-05-09 CA CA002221031A patent/CA2221031A1/fr not_active Abandoned
- 1996-05-09 AT AT96919883T patent/ATE190977T1/de not_active IP Right Cessation
- 1996-05-09 AU AU58255/96A patent/AU708894B2/en not_active Ceased
- 1996-05-09 WO PCT/FR1996/000697 patent/WO1996035682A1/fr active IP Right Grant
- 1996-05-09 EP EP96919883A patent/EP0824531B1/fr not_active Expired - Lifetime
- 1996-05-09 US US08/952,133 patent/US5880296A/en not_active Expired - Fee Related
- 1996-05-09 NZ NZ308581A patent/NZ308581A/xx unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2102422A (en) * | 1981-07-28 | 1983-02-02 | Reckitt & Colmann Prod Ltd | Imidazoline derivatives |
EP0310745A2 (fr) * | 1984-11-23 | 1989-04-12 | Orion-Yhtymä Oy | Dérivés d'imidazole substitué et leur préparation et utilisation |
WO1992005171A1 (fr) * | 1990-09-14 | 1992-04-02 | Reckitt & Colman Products Limited | Derives d'imidazoline |
Non-Patent Citations (1)
Title |
---|
C. R. EDWARDS ET AL.: "A Practical Synthesis of 2,3-Dihydro-2-benzofurancarboxylic Acid: A General Route to 2,3-Dihydrobenzofurans", JOURNAL OF HETEROCYCLIC CHEMISTRY, vol. 24, no. 2, March 1987 (1987-03-01), PROVO US, pages 495 - 496, XP002010279 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2780967A1 (fr) * | 1998-07-13 | 2000-01-14 | Pf Medicament | Procede de preparation de derives du 2,3-dihydrobenzofurane -2,2-disubstitues |
WO2000002836A1 (fr) * | 1998-07-13 | 2000-01-20 | Pierre Fabre Medicament | Procede de preparation de derives du 2,3-dihydrobenzofurane-2,2-disubstitues |
WO2000015624A1 (fr) * | 1998-09-10 | 2000-03-23 | Pierre Fabre Sante, Societe Anonyme | Derive d'ester d'acide 2-ethyl-2,3-dihydrobenzofurane-carboxylique, procede de preparation et utilisation pour la preparation de derives de l'efaroxan |
FR2784989A1 (fr) * | 1998-09-10 | 2000-04-28 | Fabre Pierre Sante | Derive d'ester d'acide 2-ethyl-2,3-dihydrobenzofurane- carboxylique, procede de preparation et utilisation pour la preparation de derives de l'efaroxan |
Also Published As
Publication number | Publication date |
---|---|
US5880296A (en) | 1999-03-09 |
AU708894B2 (en) | 1999-08-12 |
EP0824531A1 (fr) | 1998-02-25 |
FR2733983A1 (fr) | 1996-11-15 |
CA2221031A1 (fr) | 1996-11-14 |
DE69607341D1 (de) | 2000-04-27 |
EP0824531B1 (fr) | 2000-03-22 |
FR2733983B1 (fr) | 1997-08-01 |
AU5825596A (en) | 1996-11-29 |
ATE190977T1 (de) | 2000-04-15 |
JPH11505223A (ja) | 1999-05-18 |
NZ308581A (en) | 1999-11-29 |
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