WO2003027071A1 - Procede de preparation de n-(omega-bromoalkyl)phtalimides - Google Patents
Procede de preparation de n-(omega-bromoalkyl)phtalimides Download PDFInfo
- Publication number
- WO2003027071A1 WO2003027071A1 PCT/FR2002/003274 FR0203274W WO03027071A1 WO 2003027071 A1 WO2003027071 A1 WO 2003027071A1 FR 0203274 W FR0203274 W FR 0203274W WO 03027071 A1 WO03027071 A1 WO 03027071A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dibromoalkane
- phthalimide
- boiling point
- alcohol
- potassium phthalimide
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
- C07D209/44—Iso-indoles; Hydrogenated iso-indoles
- C07D209/48—Iso-indoles; Hydrogenated iso-indoles with oxygen atoms in positions 1 and 3, e.g. phthalimide
Definitions
- the present invention relates to a process for the preparation of N- (co-bromoal yl) phtaIimides of formula:
- the most commonly used method for preparing the compounds of formula (I) consists in reacting a potassium phthalimide (II) with an ⁇ , ⁇ -dibromoalkane (III) according to reaction (1):
- the potassium (II) salt can be used as is. It can also be prepared in situ by the action generally of potassium carbonate (anhydrous) or of potassium hydroxide on the phthalimide of formula:
- the solid residue is dissolved in 50 ml of CHCl 3 and the mixture, filtered if necessary, is extracted with twice 75 ml of water, washed with 40 ml of a 0.1 molar sodium hydroxide solution in order to remove the phthalimide of potassium and washed again with 40 ml of water.
- the CHCl 3 is removed under reduced pressure and the residue is triturated with 300 ml of ether and the solution is filtered. Diphtalimidohexane (17 g) is rejected. The ether is removed from the filtrate.
- the solid residue is recrystallized with 250 ml of 75% ethyl alcohol and then dried under vacuum.
- N- (6-bromohexyI) phtaIimide is obtained with a yield of 66%.
- N- (3-bromopropyDphthalimide is obtained with a yield of 72% according to the following method.
- 101 g are introduced into a 1-liter flask provided with stirring and cooling means.
- the reaction medium is brought to reflux with stirring to which is added at intervals of hour 1 5 g, 10 g and 6.3 g of potassium phthalimide (total 46.3 g: 0.25 mole).
- the reflux is maintained in total for 24 hours.
- the KBr is removed by filtration and the acetone is evaporated.
- the oil obtained is distilled under reduced pressure to remove the excess of 1,3-dibromopropane and then the N- (3-bromopropyl) phthalimide is recrystallized twice from ethanol to remove the diphthalimidopropane, dicondensation product.
- the hot ethanolic solution is filtered, the KBr cake obtained is washed with hot ethanol.
- the alcohol in the ethanolic filtrate is distilled under reduced pressure, then the dry residue is treated at reflux with 500 ml of CS for approximately 50 minutes in order to separate the soluble ⁇ -bromoethylphthalimide from the insoluble diphthalimidoethane.
- the suspension is filtered hot and the CS 2 is removed under reduced pressure.
- the ⁇ -bromoethylphthalimide obtained with a yield of 70-80% is in the form of yellow-brown crystals melting at 78-80 ° C.
- the Applicant has found a simple process for preparing the compounds of formula (I) which consists in condensing a potassium phthalimide (II) with an ⁇ , ⁇ -dibromoaIcane (III) without the use of cosolvents, then in extracting and purifying the product obtained with the minimum of operations without using toxic and / or highly flammable solvents.
- the subject of the invention is therefore a process for the preparation of N- ( ⁇ - bromoalkyDphthalimides of formula:
- the term “low boiling alcohol” is intended to mean an alcohol whose boiling point is at most equal to 100 ° C.
- alcohols which can be used according to the present invention, mention will be made of methanol, ethanol, isopropanol, n-propanol, tert-butanol, 2-butanol.
- ethanol or isopropanol will be used.
- two to three washes are carried out and preferably 150 to 300 g of water are used in total per mole of potassium phthalimide used.
- the condensation reaction (1) is generally carried out at atmospheric pressure, under an atmosphere of inert gas such as nitrogen.
- the reaction time can vary widely.
- the end of the reaction is determined by assaying the KBr formed.
- reaction time is the time necessary to completely transform the potassium phthalimide. It is a function of agitation, temperature and the molar ratio (III) / (II).
- a molar ratio (III) / (II) of less than 3 results in difficult agitation of the reaction medium and promotes the formation of said dicondensation products (V).
- said organic phase is taken up in a low boiling alcohol brought to reflux, then allowed to cool with stirring at room temperature.
- the N- ( ⁇ - bromoalkyDphtalimide which crystallizes, is recovered by cold filtration, the cake is washed with the alcohol mentioned above and then dried under reduced pressure at a temperature at most equal to 50 ° C.
- reaction medium After the reaction medium has cooled to 80 ° C., 200 g of water are added. After stirring for 15 min and then decantation, the aqueous phase is removed containing potassium bromide and then performs a 2nd washing (always at 80 ° C) with 50 g of water.
- the ascending refrigerant is then replaced by a distillation column, then the excess 1,4-dibromobutane is distilled under reduced pressure (8-10 mbar) with a bottom temperature increasing from 80 to 120 ° C. 815 g of 1,4-dibromobutane are thus recovered, corresponding to a recovery rate of 1,4-dibromobutane of 94%.
- the latter with a purity greater than 99.8% can be recycled directly in a subsequent operation.
- reaction medium is allowed to cool to 75-80 ° C and then 325 g of ethanol are added. After homogenization and obtaining a clear organic solution at reflux of ethanol, the reaction medium is allowed to cool with stirring at room temperature ( ⁇ 20 ° C).
- N- (4-bromobutyl) phthalimide After crystallization of N- (4-bromobutyl) phthalimide, the ethanolic suspension of the product is filtered through a frit at room temperature. The wet cake is washed with 35 g of ethanol, then dried at 50 ° C under reduced pressure (20 mHg). 268 g of N- (4-bromobutyl) phtaIimide are thus obtained, corresponding to a molar yield of 92% relative to the potassium phthalimide used.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Indole Compounds (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/490,887 US20040176613A1 (en) | 2001-09-27 | 2002-09-26 | Method for preparing n-($g(v)-bromoalkyl)phthalimides |
| EP02783212A EP1436261A1 (fr) | 2001-09-27 | 2002-09-26 | Procede de preparation de n-(omega-bromoalkyl)phtalimides |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0112421A FR2830011A1 (fr) | 2001-09-27 | 2001-09-27 | Procede de preparation de n-(omega-bromoalkyl)phtalimides |
| FR01/12421 | 2001-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003027071A1 true WO2003027071A1 (fr) | 2003-04-03 |
Family
ID=8867655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2002/003274 Ceased WO2003027071A1 (fr) | 2001-09-27 | 2002-09-26 | Procede de preparation de n-(omega-bromoalkyl)phtalimides |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20040176613A1 (fr) |
| EP (1) | EP1436261A1 (fr) |
| FR (1) | FR2830011A1 (fr) |
| WO (1) | WO2003027071A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9044305B2 (en) * | 2008-04-03 | 2015-06-02 | Cook Medical Technologies Llc | Self cleaning devices, systems and methods of use |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0330625A2 (fr) * | 1988-02-25 | 1989-08-30 | I.F.L.O. S.a.s. di Giorgio e Aldo Laguzzi | Méthode de synthèse totale pour préparer une classe de produits de structure indolique du type tryptamine, en particulier mélatonine ou N-acétyl-5-méthoxytryptamine, avec un grand degré de pureté et facilement solubles, pour utilisation thérapeutique contre les syndromes d'immunodéficience acquise |
-
2001
- 2001-09-27 FR FR0112421A patent/FR2830011A1/fr active Pending
-
2002
- 2002-09-26 WO PCT/FR2002/003274 patent/WO2003027071A1/fr not_active Ceased
- 2002-09-26 EP EP02783212A patent/EP1436261A1/fr not_active Withdrawn
- 2002-09-26 US US10/490,887 patent/US20040176613A1/en not_active Abandoned
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0330625A2 (fr) * | 1988-02-25 | 1989-08-30 | I.F.L.O. S.a.s. di Giorgio e Aldo Laguzzi | Méthode de synthèse totale pour préparer une classe de produits de structure indolique du type tryptamine, en particulier mélatonine ou N-acétyl-5-méthoxytryptamine, avec un grand degré de pureté et facilement solubles, pour utilisation thérapeutique contre les syndromes d'immunodéficience acquise |
Non-Patent Citations (4)
| Title |
|---|
| A.A.P. MEEKEL ET AL: "Synthesis of pyridinium amphiphiles used for transfection and some characteristics of amphiphile/DNA complex formation", EUR. J. ORG. CHEM., no. 4, 2000, pages 665 - 673, XP002179110 * |
| CHEMICAL ABSTRACTS, vol. 135, no. 10, 2001, Columbus, Ohio, US; abstract no. 137364, HE W. ET AL: "Studies on synthesis methods of N-(3-bromo-propyl)phthalimide" XP002199811 * |
| HUAXUE TONGBAO, no. 5, 2001, pages 300 - 302 * |
| R.H. MIZZONI ET AL: "Polyamine salts with autonomic blocking properties", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY., vol. 76, 1954, AMERICAN CHEMICAL SOCIETY, WASHINGTON, DC., US, pages 2414 - 2417, XP002199810, ISSN: 0002-7863 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2830011A1 (fr) | 2003-03-28 |
| EP1436261A1 (fr) | 2004-07-14 |
| US20040176613A1 (en) | 2004-09-09 |
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