CH304307A - Process for the preparation of a substituted cumalic acid ester. - Google Patents
Process for the preparation of a substituted cumalic acid ester.Info
- Publication number
- CH304307A CH304307A CH304307DA CH304307A CH 304307 A CH304307 A CH 304307A CH 304307D A CH304307D A CH 304307DA CH 304307 A CH304307 A CH 304307A
- Authority
- CH
- Switzerland
- Prior art keywords
- substituted
- preparation
- acid ester
- acid
- water
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/34—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D309/36—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms
- C07D309/38—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms one oxygen atom in position 2 or 4, e.g. pyrones
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Verfahren zur Herstellung eines substituierten Cumalinsäureesters. Es wurde gefunden, dass Cumalinsäuren und deren Ester, die in 4- und 6-Stellung durch einen Alkylrest substituiert sind, ins besondere solche, bei denen die Alkylreste mehr als ein C-Atom aufweisen, bemerkens- erte antibakterielle Wirkung zeigen.
So ver mag die 4,6-Dibutyl-cumalinsäure das Wachs tum von 3Iy eobacterium Phlei in sy ntlieti- sebem Milieu noch in einer Verdünnung von i 15 y pro em3 zu 90 oh, und dasjenige von taphylocoeeus aureus zu 65% zu hemmen. Die neuen Verbindungen sollen als Arznei mittel verwendet werden.
Die neuen Verbindungen können in an sieh bekannter Weise durch Kondensation der Homologen des Acetessigesters unter dem Einfluss von hoehkonzentrierten, vorzugsweise wasserfreien Mineralsäuren, insbesondere Salz säure oder Schwefelsäure, erhalten werden.
i Die Kondensation mit Schwefelsäure führt zu einem Gemisch von freier Säure und Ester, das durch fraktionierte Destillation im Hoch vakuum getrennt werden kann.
Gegenstand des Patentes ist nun ein Ver fahren zur Herstellung von 4,6-Dipropyl- cnmalinsäuremethylester, das dadurch ge kennzeichnet. ist, dass man auf Btityry 1-essig- säuremethylest.er bei gewöhnlicher Tempera tur eine hoehkonzentrierte Mineralsäure ein 9 wirken lässt, das Reaktionsprodukt mit Was ser verdünnt., die wässerige Lösung mit einem mit Wasser nicht mischbaren Lösungsmittel extrahiert und aus dem Extrakt den gesuch ten Ester isoliert.
Beispiel: 10 Gewichtsteile Butyryl-essigsäuremethyl- ester werden mit 25 Gewichtsteilen konzen trierter Schwefelsäure versetzt und 10 Tage bei Zimmertemperatur stehengelassen. Man giesst auf Eiswasser und extrahiert mit Äther. Die ätherische Lösung wird mit Wasser ge waschen und mit Natriumsulfat getrocknet, der Xther bei gewöhnlichem Druck abdestil- liert und der Rückstand im Vakuum fraktio niert. Der 4,6-Dipropyl-ciunalinsäiiremethyl- ester . siedet unter 0,1 mm bei 130 C und stellt ein gelbes öl dar.
Als weitere Fraktion geht bei 0,2 mm zwi schen 180 - 190 @C ein gelbes öl über, das beim Erkalten halb fest wird und im wesent lichen aus der 4,6-Dipropyl-ctunalinsäure be steht.
Process for the preparation of a substituted cumalic acid ester. It has been found that cumalic acids and their esters which are substituted in the 4- and 6-positions by an alkyl radical, in particular those in which the alkyl radicals have more than one carbon atom, show a remarkable antibacterial effect.
Thus 4,6-dibutyl-cumalic acid is able to inhibit the growth of 3Iy eobacterium Phlei in a sy ntlietisebem milieu at a dilution of 15% per em3 to 90% and that of Taphylocoeeus aureus to 65%. The new compounds are to be used as drugs.
The new compounds can be obtained in a manner known per se by condensation of the homologues of the acetoacetic ester under the influence of highly concentrated, preferably anhydrous mineral acids, in particular hydrochloric acid or sulfuric acid.
i The condensation with sulfuric acid leads to a mixture of free acid and ester, which can be separated by fractional distillation under high vacuum.
The subject of the patent is now a process for the production of 4,6-Dipropyl- cnmalinsäuremethylester, which is characterized by ge. is that a highly concentrated mineral acid is allowed to act on Btityry 1-acetic acid methyl ester at normal temperature, the reaction product is diluted with water, the aqueous solution is extracted with a water-immiscible solvent and the extract is used th ester isolated.
Example: 10 parts by weight of methyl butyryl acetate are mixed with 25 parts by weight of concentrated sulfuric acid and left to stand for 10 days at room temperature. It is poured into ice water and extracted with ether. The ethereal solution is washed with water and dried with sodium sulphate, the Xther is distilled off at normal pressure and the residue is fractionated in vacuo. The 4,6-dipropyl-ciunalinic acid methyl ester. boils below 0.1 mm at 130 C and is a yellow oil.
A yellow oil passes over as a further fraction at 0.2 mm between 180-190 ° C, which becomes semi-solid on cooling and essentially consists of 4,6-dipropyl-ctunalic acid.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH300714T | 1951-10-18 | ||
CH304307T | 1951-10-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH304307A true CH304307A (en) | 1954-12-31 |
Family
ID=25734279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH304307D CH304307A (en) | 1951-10-18 | 1951-10-18 | Process for the preparation of a substituted cumalic acid ester. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH304307A (en) |
-
1951
- 1951-10-18 CH CH304307D patent/CH304307A/en unknown
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