CH250007A - Process for the preparation of a benzenesulfonamide derivative. - Google Patents
Process for the preparation of a benzenesulfonamide derivative.Info
- Publication number
- CH250007A CH250007A CH250007DA CH250007A CH 250007 A CH250007 A CH 250007A CH 250007D A CH250007D A CH 250007DA CH 250007 A CH250007 A CH 250007A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- pyrazole
- benzenesulfonamido
- benzenesulfonamide derivative
- derivative
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings 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
- C07D231/38—Nitrogen atoms
- C07D231/42—Benzene-sulfonamido pyrazoles
Description
Verfahren zur Herstellung eines Benzolsnlfonamidderivates. Gegenstand des vorliegenden Patentes ist ein Verfahren zur Herstellung des im Schweiz.
Patent Nr. 242496 beschriebenen Benzolsulfonamidderivates, das dadurch ge- kennzeichnet ist, dass man ein 3-Benzolsul- fonamido-pyrazol, das im Benzolring in -p-Stellung zur Sulfonamidgruppe einen durch Reduktion in die Aminogruppe überführ- baren Substituenten aufweist, mit einem re duzierenden Mittel behandelt.
Das 3-Benzolsulfonamido-pyrazol, dass im Benzolring in p-Stellung zur Sulfonamid gruppe einen durch Reduktion in die Amino- gruppe überführ-baren Substituenten enthält; kann auf verschiedene Art und Weise ge wonnen werden.
Besonders geeignet isst die Umsetzung der entsprechenden reaktions fähigen Benzolsulfonsäurederivate, insbeson- dere der Benzolsulfonsäurehalogenide, mit Pyrazolverbindungen, die in 3-Stellung eine Gruppe enthalten, die mit dem Benzolsulfon- säurederivat ein 3-Benzolsulfonamido-pyrazol zu bilden vermag,
insbesondere mit 3-Amino- pyrazol. Man kann aber auch entsprechende Sulfonamide der Formel RSOZNHY, in der Y einen bei der Reaktion sich abspaltenden Rest bedeutet, mit 3-Halogen-pyrazolon um setzen oder andere dem Fachmann geläufige Herstellungsmethoden benutzen.
<I>Beispiel 1:</I> 26,8 g 3-(p-Nitro-benzolsulfonamido)- pyrazol, das durch Kondensation von p-Nitro- benzolsulfochlorid mit 3-Amino-pyrazol er halten wurde,
werden in der 50fachen Menge absolutem Alkohol gelöst und mit 10 Ge wichtsprozenten eines Nickel-Träger-gata- lysators im Rührautoklaven mit Wasserstoff unter einem Überdruck von 50 Atm bis zur Beendigung der Wasserstoffaufnahme bei 100-120 behandelt. Nach dem Erkalten wird vom Katalysator abfiltriert und die alkoholische Lösung eingedampft. Dabei fällt das gebildete 3-(p-Amino-benzolsulfon- amido)-pyra.zol kristallin an.
Die Verbin dung wird zur Reinigung aus verdünnter Essigsäure, gegebenenfalls unter Zusatz von Tierkohle, umkristallisiert. Schmelzpunkt 224-226 .
<I>Beispiel 2:</I> 26,8 g 3-(p-Nitro-benzolsulfonamido)- pyrazol werden mittels 67,7g Zinnchlorür (Hydrat) und der doppelten Gewichtsmenge konzentrierter Salzsäure reduziert. Das ge bildete 3 - (p - Amino - benzolsulfonamido)- pyrazol wird isoliert und gegebenenfalls wie im Beispiel 1 umkristallisiert. Schmelzpunkt 224-226 .
Das entstandene p-Amino-benzolsulfon- amidderivat lässt sich auch in Form seiner Salze, z. B. des Natriums oder des Kalziums. isolieren.
Process for the preparation of a benzene sulfonamide derivative. The subject of the present patent is a process for the production of the in Switzerland.
Patent No. 242496 described benzenesulfonamide derivative, which is characterized in that a 3-benzenesulfonamido-pyrazole, which in the benzene ring in the -p position to the sulfonamide group has a substituent which can be converted into the amino group by reduction, with a re dealt with dozen means.
The 3-benzenesulfonamido-pyrazole that in the benzene ring in the p-position to the sulfonamide group contains a substituent which can be converted into the amino group by reduction; can be obtained in various ways.
The reaction of the corresponding reactive benzenesulfonic acid derivatives, in particular the benzenesulfonic acid halides, with pyrazole compounds which contain a group in the 3-position which is able to form a 3-benzenesulfonamido-pyrazole with the benzenesulfonic acid derivative is particularly suitable,
especially with 3-aminopyrazole. However, corresponding sulfonamides of the formula RSOZNHY, in which Y denotes a radical which is split off during the reaction, can also be reacted with 3-halopyrazolone or other preparation methods familiar to the person skilled in the art can be used.
<I> Example 1: </I> 26.8 g of 3- (p-nitro-benzenesulfonamido) - pyrazole, which was obtained by condensation of p-nitro-benzenesulfochloride with 3-amino-pyrazole,
are dissolved in 50 times the amount of absolute alcohol and treated with 10 percent by weight of a nickel carrier catalyst in a stirred autoclave with hydrogen under an overpressure of 50 atm until the hydrogen uptake ceases at 100-120. After cooling, the catalyst is filtered off and the alcoholic solution is evaporated. The 3- (p-amino-benzenesulfonamido) -pyra.zol formed is obtained in crystalline form.
For purification, the compound is recrystallized from dilute acetic acid, optionally with the addition of animal charcoal. Melting point 224-226.
Example 2: 26.8 g of 3- (p-nitro-benzenesulphonamido) pyrazole are reduced using 67.7 g of tin chloride (hydrate) and twice the amount by weight of concentrated hydrochloric acid. The 3 - (p - amino - benzenesulfonamido) pyrazole formed is isolated and, if necessary, recrystallized as in Example 1. Melting point 224-226.
The resulting p-amino-benzenesulfonamide derivative can also be used in the form of its salts, e.g. B. of sodium or calcium. isolate.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE250007X | 1939-05-23 | ||
CH244347T | 1941-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH250007A true CH250007A (en) | 1947-07-31 |
Family
ID=25728935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH250007D CH250007A (en) | 1939-05-23 | 1941-05-23 | Process for the preparation of a benzenesulfonamide derivative. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH250007A (en) |
-
1941
- 1941-05-23 CH CH250007D patent/CH250007A/en unknown
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CH250007A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH250003A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH250000A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH250002A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH249997A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH244345A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH250001A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH244348A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH244347A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
DE539806C (en) | Process for the preparation of isopropylallylbarbituric acid | |
AT134626B (en) | Process for the preparation of amino alcohols. | |
DE823446C (en) | Process for the production of thiosemicarbazones | |
CH244346A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
DE845347C (en) | Process for the preparation of pyridine-mercury compounds | |
CH194648A (en) | Process for the preparation of a 4,5-alkyl-substituted 2-aminodiaryl ketone. | |
CH239691A (en) | Process for the preparation of a new benzenesulfonamide derivative. | |
CH242492A (en) | Process for the preparation of a new benzenesulfonamide derivative. | |
CH242496A (en) | Process for the preparation of a new benzenesulfonamide derivative. | |
CH239683A (en) | Process for the preparation of a new benzenesulfonamide derivative. | |
CH242493A (en) | Process for the preparation of a new benzenesulfonamide derivative. | |
CH250005A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH249999A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH242490A (en) | Process for the preparation of a new benzenesulfonamide derivative. | |
CH249998A (en) | Process for the preparation of a benzenesulfonamide derivative. | |
CH291106A (en) | Process for the preparation of a new quaternary ammonium compound. |