CH311638A - 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
- CH311638A CH311638A CH311638DA CH311638A CH 311638 A CH311638 A CH 311638A CH 311638D A CH311638D A CH 311638DA CH 311638 A CH311638 A CH 311638A
- Authority
- CH
- Switzerland
- Prior art keywords
- anilide
- methyl
- halogen
- fatty acid
- production
- Prior art date
Links
Description
Verfahren zur Herstellung eines neuen basisch substituierten Fettsäure (2-halogen-6.methyl-anilids). Gegenstand cies vorliegenden Patentes bil det ein Verfahren zur Herstellung eines neuen basisch substituierten Fettsäure-(2-halogen-6- inethyl-anilids), welches dadurch gekennzeich net ist, dass man eine Verbindung der Formel
EMI0001.0005
in welcher X einen reaktionsfähigen, während der Reaktion sieh abspaltenden Rest bedeutet, mit Piperazin umsetzt.
Der Rest X kann in einem Halogenatom oder einem sonstigen für den Austausch gegen den basischen Rest geeigneten reaktionsfähigen Substituenten, wie z. B. einer Alky1sulfonyl- oxy- oder Arylsulfonyloxygruppe, bestehen. Der Austausch der Gruppe X gegen den Piperazinrest erfolgt z.
B. durch einfaches Er wärmen mit Piperazin gegebenenfalls in Ge genwart eines basisch reagierenden Konden sationsmittels oder von Piperazin im Über- schuss. Das N-Piperazinyl-essigsäure-(2-chlor- 6-methyl-anilid) ist ein Öl, das nach einiger Zeit zu farblosen, bei 93-95 schmelzenden Kristallen erstarrt.
Das neue Anilid soll als Lokalanästhetikum und als Zwischenprodukt zur Herstellung wei terer Derivate Verwendung finden. <I>Beispiel:</I> 44 Gewichtsteile Chloracet-(2-chlor-6-me- thyl-anilid) (gewonnen durch Umsetzen von 2-Chlor-6-inethyl-anilin mit Cliloracetylchlorid in Gegenwart von Natriumacetat, Schmp. 140 bis 141 )
werden in 150 Gewichtsteilen Ätha- nol suspendiert und mit 120 Gewichtsteilen Piperazinhvclrat versetzt. Die Temperatur steigt dabei leicht an, und ein grosser Teil des Reaktionsgemisches geht in Lösung. Nun wird während 4 Stunden bei Zimmertemperatur ge rührt und dann einige Stunden bei 70-80 .
Anschliessend versetzt man mit Wasser, wobei die als Nebenprodukt gebildete, sehr schwer wasserlösliche Bis-Verbindung Pipera.zinyl- N,N' -bis - essigsäure - (2 - chlor-6-methyl-anilid) ausfällt. Diese wird abfiltriert und das Filtrat mit Wasserdampf behandelt. Dann wird mit Kochsalz gesättigt und nach dem Erkalten mit Äther ausgeschüttelt. Nach dem Trocknen der ätherischen Lösung und Verjagen des Lö sungsmittels verbleibt ein Öl, das nach einiger Zeit zu Kristallen erstarrt.
Man erhält 50 Ge- wichtsteile reines N-Pipera.zinyl-essigsäure-(2- chlor-6-methyl-anilid). Die Umsetzung kann auch mit wasserfreiem Piperazin in Benzol stattfinden.
Process for the production of a new basic substituted fatty acid (2-halogen-6.methyl-anilids). The subject of this patent is a process for the preparation of a new basic substituted fatty acid (2-halogen-6-ynethyl-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 piperazine.
The radical X can be in a halogen atom or any other reactive substituent suitable for replacement with the basic radical, such as. B. an alky1sulfonyl oxy or arylsulfonyloxy group exist. The exchange of group X against the piperazine residue takes place, for.
B. by simply heating it with piperazine, possibly in the presence of a basic condensation agent or of piperazine in excess. N-piperazinyl-acetic acid- (2-chloro-6-methyl-anilide) is an oil that solidifies after some time to colorless crystals that melt at 93-95.
The new anilide is to be used as a local anesthetic and as an intermediate for the production of further derivatives. <I> Example: </I> 44 parts by weight of chloroacet- (2-chloro-6-methyl-anilide) (obtained by reacting 2-chloro-6-methyl-aniline with chloroacetyl chloride in the presence of sodium acetate, melting point 140 up to 141)
are suspended in 150 parts by weight of ethanol and mixed with 120 parts by weight of Piperazinhvclrat. 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 70-80.
Then water is added, the very poorly water-soluble bis-compound pipera.zinyl-N, N'-bis-acetic acid (2-chloro-6-methyl-anilide) formed as a by-product precipitating. This is filtered off and the filtrate is treated with steam. Then it is saturated with table salt and shaken out with ether after cooling. After the essential solution has dried and the solvent has been chased away, an oil remains that solidifies into crystals after a while.
50 parts by weight of pure N-pipera.zinyl-acetic acid (2-chloro-6-methyl-anilide) are obtained. The reaction can also take place with anhydrous piperazine in benzene.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH311638T | 1952-02-25 | ||
CH307799T | 1952-11-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH311638A true CH311638A (en) | 1955-11-30 |
Family
ID=25735371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH311638D CH311638A (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) | CH311638A (en) |
-
1952
- 1952-02-25 CH CH311638D patent/CH311638A/en unknown
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