CH188802A - Process for the production of l-ascorbic acid (vitamin C). - Google Patents
Process for the production of l-ascorbic acid (vitamin C).Info
- Publication number
- CH188802A CH188802A CH188802DA CH188802A CH 188802 A CH188802 A CH 188802A CH 188802D A CH188802D A CH 188802DA CH 188802 A CH188802 A CH 188802A
- Authority
- CH
- Switzerland
- Prior art keywords
- ascorbic acid
- vitamin
- production
- acid
- keto
- Prior art date
Links
Classifications
-
- 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
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members 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 ring carbon atoms
- C07D307/62—Three oxygen atoms, e.g. ascorbic acid
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Verfahren zur Herstellung von l-Ascorbinsäure (C-Vitamin). Die physiologisch wichtige 1-Ascorbin- säure ist vor kurzem synthetisch aus l-Xylo- son (= l-Lygoson) durch Einwirkung von Blausäure und nachträgliche saure Versei fung bereitet worden.
Sie hat sich mit den in der Natur aufgefundenen Körpern als identisceh und auch biologi & oh als wirksames C-Vitamin erwiesen (Helv. Chim. Acta 16, 1933, s.1019).
Dieses erste Verfahren hat den Vorteil eines sehr allgemeinen Anwendungsberei ches; es hat bisher in allen untersuchten Fäl len die entsprechenden 3-getosäuren, bezw. ihre Anhydride ergeben. Für die spezielle Bereitung der 1-Ascorbinsäure hat es da gegen den Nachteil, dass das nötige Aus gangsmaterial, das l-Xyloson, nur sehr schwierig und auf kostspieligem Wege zu beschaffen ist. Auf der Suche nach einer technisch besser brauchbaren Methode wurde ein weiterer Weg aufgefunden.
Nach diesem Verfahren wird 1-Ascorbinsäure dadurch ge wonnen, dass 2-Keto-l-gulonsäure gegebenen falls nach vorheriger Veresterung zunächst mit zur Enolisierung geeigneten alkalischen Mitteln, dann mit starken Säuren behandelt wird (siehe Patent Nr. 174208).
Statt durch alkalische Mittel kann die Umlagerung der 2-Keto-l-gulonsäure oder ihrer mit Säure leicht spaltbaren Derivate auch durch Erwärmung bei saurer Reaktion erfolgen (siehe Patent Nr. 180810 und Zu sätze). Dabei wird die Erwärmung der 2- Keto-l-gulonsäure oder ihrer mit Säure leicht spaltbaren Derivate zum Beispiel in wäs seriger oder alkoholischer Lösung durchge führt.
Es wurde nun gefunden, dass sich die Umlagerung der 2-Keto-l-gulonsäureester be sonders vorteilhaft gestaltet, wenn sie durch Erwärmung bei saurer Reaktion in Gegen wart von indifferenten Verdünnungsmitteln, wie z. B. Chloroform, Diogan, vorgenommen wird.
<I>Beispiel:</I> 35 g 2-Keto-l-gulonsäuremethylester wer den in einem Gemisch von 80 cm' Chloro form und 20 cm' 15 % iger alkoholischer iSalz- säure 70 Stunden unter Rühren am Rück flusskühler gekocht. Dann wird abfiltriert und mit einem Gemisch von Chloroform und Alkohol gewaschen. Es werden 20,5 g 1-As- corbinsäure erhalten, die bei der Titration mit Jod einen Reinheitsgrad von 97,3/o zeigen.
Process for the production of l-ascorbic acid (vitamin C). The physiologically important 1-ascorbic acid was recently prepared synthetically from l-xylosone (= l-lygosone) through the action of hydrocyanic acid and subsequent acidic saponification.
It has proven to be identical with the bodies found in nature and also biologically as an effective C vitamin (Helv. Chim. Acta 16, 1933, p.1019).
This first method has the advantage of being very general in scope; so far it has len the corresponding 3-geto acids, respectively. their anhydrides result. For the special preparation of 1-ascorbic acid it has the disadvantage that the necessary starting material, the l-xyloson, is very difficult and expensive to obtain. In the search for a technically more useful method, another way was found.
According to this process, 1-ascorbic acid is obtained by treating 2-keto-l-gulonic acid, optionally after esterification, first with alkaline agents suitable for enolization and then with strong acids (see patent no. 174208).
Instead of using alkaline agents, the rearrangement of 2-keto-l-gulonic acid or its derivatives, which are easily cleaved with acid, can also be carried out by heating with an acidic reaction (see patent no. 180810 and additives). The heating of the 2-keto-l-gulonic acid or its derivatives, which can be easily cleaved with acid, is carried out, for example, in aqueous or alcoholic solution.
It has now been found that the rearrangement of the 2-keto-l-gulonic acid esters is particularly advantageous when it is heated in an acidic reaction in the presence of inert diluents such as. B. Chloroform, Diogan is made.
<I> Example: </I> 35 g of methyl 2-keto-l-gulonate are boiled in a mixture of 80 cm of chloroform and 20 cm of 15% alcoholic hydrochloric acid for 70 hours on the reflux condenser while stirring. It is then filtered off and washed with a mixture of chloroform and alcohol. 20.5 g of 1-ascorbic acid are obtained which, when titrated with iodine, show a degree of purity of 97.3%.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH180810T | 1935-06-18 | ||
CH188802T | 1935-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH188802A true CH188802A (en) | 1937-01-15 |
Family
ID=25720467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH188802D CH188802A (en) | 1935-06-18 | 1935-11-26 | Process for the production of l-ascorbic acid (vitamin C). |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH188802A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1048663A1 (en) * | 1999-04-28 | 2000-11-02 | Basf Aktiengesellschaft | Process for the preparation of L-ascorbic acid |
-
1935
- 1935-11-26 CH CH188802D patent/CH188802A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1048663A1 (en) * | 1999-04-28 | 2000-11-02 | Basf Aktiengesellschaft | Process for the preparation of L-ascorbic acid |
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