CH311622A - Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide). - Google Patents
Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide).Info
- Publication number
- CH311622A CH311622A CH311622DA CH311622A CH 311622 A CH311622 A CH 311622A CH 311622D A CH311622D A CH 311622DA CH 311622 A CH311622 A CH 311622A
- Authority
- CH
- Switzerland
- Prior art keywords
- anilide
- methyl
- halogen
- production
- pyrrolidine
- Prior art date
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines neuen basisch substituierten Fettsäure (2-halogen-6.methyl-anilids). Gegenstand des vorliegenden Patentes bil det ein Verfahren zur Herstellung eines neuen basisch substituierten Fettsäure-(2-halogen-6- methyl-anilids), welches dadurch gekennzeich net ist, dass man eine Verbindung der Formel
EMI0001.0005
in welcher X einen reaktionsfähigen, während der Reaktion sich abspaltenden Rest bedeutet, mit. Pyrrolidin umsetzt.
Der Rest X kann in einem Halogenatom oder einem sonstigen für den Austausch gegen den basischen Rest geeigneten reaktionsfähi gen Substituenten, wie z. B. einer AlkyIsul- fonyloxy- oder Arylsulfonyloxygruppe, beste hen. Der Austausch der Gruppe X gegen den Pyrrolidinrest erfolgt z. B. durch einfaches Erwärmen mit Pyrrolidin gegebenenfalls in Gegenwart. eines basisch reagierenden Konden sationsmittels oder von Pyrrolidin im Über sehuss.
Das a-Pyrrolidino-propionsäure- (2- chlor-6-rnethyl-anilid) ist ein farbloses, unter 0,02 mm Hg bei 133-136 siedendes Öl, das nach einiger Zeit zu farblosen, bei 71-73 schmelzenden Kristallen erstarrt. Das Hydro chlorid der Base schmilzt bei 243-246 unter Zersetzung. Das neue Anilid soll als Lokalanästhetikum und als Zwischenprodukt zur Herstellung wei terer Derivate Verwendung finden.
Beispiel: 55 Gewichtsteile a-Brom-propionsäure-(2- chlor-6-methyl-anüid) (gewonnen durch Um setzen von 2-Chlor-6-methyl-aniilin mit a-Bröm- propionylchlorid in Gegenwart von Natrium acetat, Schmp. 145-147 ) werden in Ätha- nol suspendiert und mit. 42 Gewichtsteilen Pyrrolidin versetzt. Die Temperatur steigt dabei leicht an und ein grosser Teil des Reaktionsgemisches geht in Lösung.
Nun wird während 4 Stunden bei Zimmertem peratur gerührt und dann einige Stunden bei 65-75 . Eine Probe mit Wasser und nach folgend mit verdünnter Salzsäure versetzt er gibt wieder Lösung des ausgefallenen Nieder schlages. Mit Wasserdampf wird hierauf der Alkohol und das überschüssige Pyrrolidin ab geblasen und nach dem Erkalten das zurück bleibende Öl in Äther aufgenommen. Nach dem Trocknen der ätherischen Lösung und Verjagen des Lösungsmittels verbleibt ein Öl, das durch Vakuumdestillation gereinigt wird.
Man erhält 44 Gewichtsteile reines a-Pyrro- lidino-propionsäure-(2-chlor-6-methyl-anilid) . Die Umsetzung mit Pyrrolidin kann auch in Benzol stattfinden.
Process for the production of a new basic substituted fatty acid (2-halogen-6.methyl-anilids). The subject of the present patent bil det a process for the preparation of a new basic substituted fatty acid (2-halo-6-methyl-anilide), which is characterized in that a compound of the formula
EMI0001.0005
in which X denotes a reactive radical which is split off during the reaction, with. Reacts pyrrolidine.
The radical X can be in a halogen atom or other suitable reactive substituents for replacement with the basic radical, such as. B. an AlkyIsul- fonyloxy or arylsulfonyloxy group, best hen. The exchange of the group X against the pyrrolidine radical takes place, for. B. by simply heating with pyrrolidine, optionally in the presence. an alkaline condensation agent or an excess of pyrrolidine.
The a-pyrrolidino-propionic acid- (2-chloro-6-methyl-anilide) is a colorless oil, boiling below 0.02 mm Hg at 133-136, which solidifies after some time to colorless crystals melting at 71-73. The hydrochloride of the base melts at 243-246 with decomposition. The new anilide is to be used as a local anesthetic and as an intermediate for the production of further derivatives.
Example: 55 parts by weight of a-bromopropionic acid (2-chloro-6-methyl-anuide) (obtained by converting 2-chloro-6-methyl-aniline with a-bromopropionyl chloride in the presence of sodium acetate, mp. 145-147) are suspended in ethanol and mixed with. 42 parts by weight of pyrrolidine are added. The temperature rises slightly and a large part of the reaction mixture goes into solution.
The mixture is then stirred for 4 hours at room temperature and then for a few hours at 65-75. A sample is mixed with water and then mixed with dilute hydrochloric acid. He gives a solution of the precipitate again. The alcohol and the excess pyrrolidine are then blown off with steam and, after cooling, the remaining oil is absorbed in ether. After the essential solution has dried and the solvent has been driven off, an oil remains which is purified by vacuum distillation.
44 parts by weight of pure α-pyrrolidino-propionic acid (2-chloro-6-methyl-anilide) are obtained. The reaction with pyrrolidine can also take place in benzene.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH311622T | 1952-02-25 | ||
CH307799T | 1952-11-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH311622A true CH311622A (en) | 1955-11-30 |
Family
ID=25735355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH311622D CH311622A (en) | 1952-02-25 | 1952-02-25 | Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide). |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH311622A (en) |
-
1952
- 1952-02-25 CH CH311622D patent/CH311622A/en unknown
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