CH270987A - Process for the preparation of a derivative of p-amino-salicylic acid. - Google Patents
Process for the preparation of a derivative of p-amino-salicylic acid.Info
- Publication number
- CH270987A CH270987A CH270987DA CH270987A CH 270987 A CH270987 A CH 270987A CH 270987D A CH270987D A CH 270987DA CH 270987 A CH270987 A CH 270987A
- Authority
- CH
- Switzerland
- Prior art keywords
- acid
- melts
- amino
- diamino
- derivative
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom 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
- C07D213/72—Nitrogen atoms
- C07D213/76—Nitrogen atoms to which a second hetero atom is attached
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/34—Monoazo dyes prepared by diazotising and coupling from other coupling components
- C09B29/36—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds
- C09B29/3604—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom
- C09B29/3617—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom containing a six-membered heterocyclic with only one nitrogen as heteroatom
Description
Verfahren zur Darstellung eines Derivates der p-Amino-salicylsäure. Das 2',6'-Diamino-pyridyl- (3')-azobenzol ist als ein gutes Harndesinfiziens bekannt. Im Laufe der Zeit sind von dieser Verbindung zahlreiche im Benzolkern substituierte Deri vate bekanntgeworden.
Es wurde nun gefunden, dass Verbindun gen der allgemeinen Formel
EMI0001.0007
worin R, und R,_, Amino-, Alkylamino-, Acyl- amino-, Oxy-, Alkotygruppen oder Halogen atome, z. B. Chlor- oder Bromatome, bedeu ten, und wobei die Substituenten R, und R_ zusammen nicht mehr als 15 Kohlenstoff atome aufweisen, wertvolle therapeutische Eigenschaften besitzen. So zeigen sie z. B.
eine starke Aktivität gegen Tuberkulose bazillen, eine Eigenschaft, welche dem ein gangs erwähnten 2',6'-Diamino-pyridi-1-(3')- azobenzol und seinen bekannten, im Benzol kern substituierten Derivaten nicht zukommt. Zur Verabreichung per os eignen sich sowohl die freien Karbonsäuren als auch ihre Salze mit Säuren, während die Salze des Natriums und diejenigen von organischen Basen vor allem zur intravenösen Applikation und zur Instillation in Körperhöhlen Verwendung finden sollen.
Die erfindungsgemässen Verbindungen können hergestellt werden, indem man diazo- tierte 4-Amino-salicvls,iure mit einer Verbin dung der allgemeinen Formel
EMI0001.0026
kuppelt, wobei R,, und R; die genannte Be- deutung haben.
Die Kupplung wird vorteilhaft in saurem Milieu vorgenommen, und zwar vorzugsweise in schwefelsaurer, salpetersaurer oder salz saurer Lösung. Es kann aber auch jede an dere Säure, welche die Diazotierung nicht stört, verwendet werden.
Die bei der Kupplung entstehenden Säure salze, die allgemein in Wasser schwer löslich sind, können zur Isolierung der neuen Ver bindungen dienen. Man kann letztere aber auch in Form ihrer Alkali- oder Erdalkali- salze isolieren, zum Beispiel als Natrium oder Kalziumsalze.
Gegenstand des vorliegenden Patentes ist nun ein Verfahren zur Darstellung eines De rivates der -1- Amino-salici-lsäure, das da durch gekennzeichnet ist, dass man diazo- tierte 4-Amino-salicylsäure mit 2,6-Diamino- py ridin kuppelt. Die so erhaltene neue Ver bindung, die 2-Oxy-4-[2',6'@diamino-pyridyl- (3') ]-azobenzoesäure, bildet. ein gelbes, bei 262 unter Zersetzung schmelzendes kristal lines Pulver.
Sie ist in Wasser, verdünnten und konzentrierten Mineralsäuren schwer löslich, und ausser in heissem Äthanol prak tisch unlöslich in den gebräuchlichen orga nischen Lösungsmitteln. Sie bildet ein bei 1440 unter Zersetzung schmelzendes Dinitrat und ein über<B>3000</B> schmelzendes Sulfat. -Die neue Verbindung soll therapeutische Verwen dung finden.
<I>Beispiel 1:</I> 344 g 4-Amino-salicylsäure werden mit 156 g Natriumnitrit in üblicher Weise bei -20 langsam dianotiert. Nach der Zugabe des Nitrites wird die Diazolösung noch eine Vier telstunde weitergerührt.
Anderseits werden 270 g 2,6-Diamino-pyridin in 4 Litern 2n- Schwefelsäure aufgeschlämmt und dem Ge- misch unter Rühren 1,5 Liter 50 %ige Schwe- felsäure zugesetzt. Die Lösung wird auf eine Temperatur von 25 bis 300 gebracht und die Diazolösung langsam eintropfen gelassen.
Gleichzeitig werden nochmals 1,5 Liter 50 %ige Schwefelsäure zugefügt. Aus der dunkelroten Flüssigkeit beginnt sich ein roter Niederschlag abzuscheiden, der nach halb stündigem Rühren abgesaugt und mit kaltem Wasser gut gewaschen wird. Der Nieder schlag wird aus verdünnter Natronlauge mit Essigsäure umgefällt und dann im Vakuum getrocknet.
Die so in einer Menge von 448 g 73% der Theorie) erhaltene 2-Oxy-4-[2',6'-di- amino-pyridyl@(3')]-azobenzoesäüre bildet ein gelbes, unter Zersetzung bei 2620 C schmel zendes, kristallines Pulver.
Es ist in Wasser, verdünnten und konzentrierten Mineralsäu ren schwer löslich, ausser in heissem Äthanol praktisch unlöslich in den gebräuchlichen organischen Lösungsmitteln, leicht löslich in verdünnten Alkalien und wässrigen Lösungen von organischen Basen.
<I>Beispiel 2:</I> 15,3 g p-Amino-salicylsäure, gelöst in 375 cms 2n-Salpetersäure, werden in der ge wöhnlichen Weise mit 6,9 g Natriumnitrit bei --2 bis 00 dianotiert, und die eisgekühlte Diazoniumsalzlösung in eine Lösung von 12 g 2,6-Diamino-pyridin in überschüssiger 2n Salpetersäure bei<B>300</B> eingetropft. Der entste henderote Niederschlag wird abgesaugt und mit verdünnter Salpetersäure gewaschen.
Er schmilzt bei 1440 unter Zersetzung und stellt das Dinitrat der 2-Oxy-4-[2',6'-diamino-pyri- dyl (3') ] -azobenzoesäure dar. Aus diesem kann, wie in Beispiel 1 beschrieben, die freie Verbindung gewonnen werden.
Process for the preparation of a derivative of p-amino-salicylic acid. The 2 ', 6'-diamino-pyridyl- (3') -azobenzene is known to be a good urine disinfectant. Over time, numerous derivatives substituted in the benzene nucleus have become known from this compound.
It has now been found that compounds of the general formula
EMI0001.0007
wherein R, and R, _, amino, alkylamino, acylamino, oxy, alkoty or halogen atoms, z. B. chlorine or bromine atoms mean, and where the substituents R, and R_ together do not have more than 15 carbon atoms, have valuable therapeutic properties. So they show z. B.
a strong activity against tuberculosis bacilli, a property which the aforementioned 2 ', 6'-diamino-pyridi-1- (3') - azobenzene and its known derivatives substituted in the benzene nucleus do not have. Both the free carboxylic acids and their salts with acids are suitable for oral administration, while the salts of sodium and those of organic bases are intended to be used primarily for intravenous administration and for instillation in body cavities.
The compounds according to the invention can be prepared by adding diazotized 4-amino-salicylic acid with a compound of the general formula
EMI0001.0026
couples, where R ,, and R; have the meaning mentioned.
The coupling is advantageously carried out in an acidic medium, preferably in a sulfuric acid, nitric acid or hydrochloric acid solution. However, any other acid that does not interfere with the diazotization can also be used.
The acid salts formed during the coupling, which are generally sparingly soluble in water, can be used to isolate the new compounds. The latter can also be isolated in the form of their alkali or alkaline earth salts, for example as sodium or calcium salts.
The present patent now relates to a process for the preparation of a derivative of -1-amino-salicylic acid, which is characterized in that diazotized 4-amino-salicylic acid is coupled with 2,6-diamino-pyridine. The new compound thus obtained, the 2-oxy-4- [2 ', 6' @ diamino-pyridyl- (3 ')] -azobenzoic acid, forms. a yellow crystalline powder which melts at 262 with decomposition.
It is sparingly soluble in water, dilute and concentrated mineral acids, and, with the exception of hot ethanol, practically insoluble in common organic solvents. It forms a dinitrate that melts with decomposition at 1440 and a sulfate that melts over <B> 3000 </B>. -The new compound should find therapeutic use.
<I> Example 1 </I> 344 g of 4-amino-salicylic acid are slowly dianotized with 156 g of sodium nitrite in the usual way at -20. After adding the nitrite, the diazo solution is stirred for another quarter of an hour.
On the other hand, 270 g of 2,6-diamino-pyridine are suspended in 4 liters of 2N sulfuric acid and 1.5 liters of 50% sulfuric acid are added to the mixture while stirring. The solution is brought to a temperature of 25 to 300 and the diazo solution is slowly added dropwise.
At the same time, another 1.5 liters of 50% sulfuric acid are added. A red precipitate begins to separate out of the dark red liquid, which is filtered off with suction after stirring for half an hour and washed well with cold water. The precipitate is reprecipitated from dilute sodium hydroxide solution with acetic acid and then dried in vacuo.
The 2-oxy-4- [2 ', 6'-di-aminopyridyl @ (3')] azobenzoic acid thus obtained in an amount of 448 g (73% of theory) forms a yellow melt, with decomposition at 2620 ° C. zendes, crystalline powder.
It is sparingly soluble in water, dilute and concentrated mineral acids, except in hot ethanol practically insoluble in common organic solvents, easily soluble in dilute alkalis and aqueous solutions of organic bases.
<I> Example 2: </I> 15.3 g of p-amino-salicylic acid, dissolved in 375 cms of 2N nitric acid, are dianotated in the usual way with 6.9 g of sodium nitrite at --2 to 00, and the Ice-cold diazonium salt solution was added dropwise to a solution of 12 g of 2,6-diamino-pyridine in excess 2N nitric acid at <B> 300 </B>. The resulting red precipitate is filtered off and washed with dilute nitric acid.
It melts at 1440 with decomposition and represents the dinitrate of 2-oxy-4- [2 ', 6'-diamino-pyridyl (3')] -azobenzoic acid. From this, as described in Example 1, the free Connection can be obtained.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH270987T | 1948-12-24 |
Publications (1)
Publication Number | Publication Date |
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CH270987A true CH270987A (en) | 1950-09-30 |
Family
ID=4478003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH270987D CH270987A (en) | 1948-12-24 | 1948-12-24 | Process for the preparation of a derivative of p-amino-salicylic acid. |
Country Status (1)
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CH (1) | CH270987A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3950321A (en) * | 1972-10-21 | 1976-04-13 | Basf Aktiengesellschaft | Disperse azo dyes of the 2,6-diaminopyridine series |
US3998802A (en) * | 1970-12-19 | 1976-12-21 | Basf Aktiengesellschaft | Azo dye with a 3-cyano- or 3-carbamoyl-4-methyl-2,6-diamino-pyridine coupling component |
US4006128A (en) * | 1973-02-14 | 1977-02-01 | Bayer Aktiengesellschaft | Azo dyestuffs containing aminopyridone coupling component |
US4016152A (en) * | 1970-12-19 | 1977-04-05 | Basf Aktiengesellschaft | Azo dye with a 2,6-diamino-5-cyano-or-5-carbamoyl-pyridine coupling component |
US4033943A (en) * | 1974-02-26 | 1977-07-05 | Ciba-Geigy Corporation | Fiber reactive water soluble 2,4,6-triamino, 3-cyano pyridine-(5) azo dyestuffs |
US4128545A (en) * | 1972-12-27 | 1978-12-05 | Basf Aktiengesellschaft | Azo dyes with 2,6-diamino-pyridine coupling component |
US4208324A (en) * | 1971-12-28 | 1980-06-17 | Ciba-Geigy Corporation | Disperse diaminopyridine-3-azo dyestuffs |
-
1948
- 1948-12-24 CH CH270987D patent/CH270987A/en unknown
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3998802A (en) * | 1970-12-19 | 1976-12-21 | Basf Aktiengesellschaft | Azo dye with a 3-cyano- or 3-carbamoyl-4-methyl-2,6-diamino-pyridine coupling component |
US4016152A (en) * | 1970-12-19 | 1977-04-05 | Basf Aktiengesellschaft | Azo dye with a 2,6-diamino-5-cyano-or-5-carbamoyl-pyridine coupling component |
US4208324A (en) * | 1971-12-28 | 1980-06-17 | Ciba-Geigy Corporation | Disperse diaminopyridine-3-azo dyestuffs |
US3950321A (en) * | 1972-10-21 | 1976-04-13 | Basf Aktiengesellschaft | Disperse azo dyes of the 2,6-diaminopyridine series |
US4128545A (en) * | 1972-12-27 | 1978-12-05 | Basf Aktiengesellschaft | Azo dyes with 2,6-diamino-pyridine coupling component |
US4006128A (en) * | 1973-02-14 | 1977-02-01 | Bayer Aktiengesellschaft | Azo dyestuffs containing aminopyridone coupling component |
US4033943A (en) * | 1974-02-26 | 1977-07-05 | Ciba-Geigy Corporation | Fiber reactive water soluble 2,4,6-triamino, 3-cyano pyridine-(5) azo dyestuffs |
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