CH240581A - Process for the preparation of p-amino-benzenesulfonylguanidine. - Google Patents
Process for the preparation of p-amino-benzenesulfonylguanidine.Info
- Publication number
- CH240581A CH240581A CH240581DA CH240581A CH 240581 A CH240581 A CH 240581A CH 240581D A CH240581D A CH 240581DA CH 240581 A CH240581 A CH 240581A
- Authority
- CH
- Switzerland
- Prior art keywords
- amino
- pseudo
- benzenesulfonylguanidine
- thiourea
- preparation
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C311/50—Compounds containing any of the groups, X being a hetero atom, Y being any atom
- C07C311/52—Y being a hetero atom
- C07C311/64—X and Y being nitrogen atoms, e.g. N-sulfonylguanidine
Description
Verfahren zur Herstellung von p-Amino-benzolsulfonylguanidin. Gegenstand des vorliegenden Patentes bildet ein Verfahren zur Herstellung von p-Amino-benzolsulfonylguanidin, das dadurch gekennzeichnet ist, dass man einen S-substi- tuierten Benzolsulfonyl-pseudo-thioharnstoff, dessen Benzolkern in p-Stellung einen durch Reduktion in die Aminogruppe überführ baren Substituenten enthält, mit Ammoniak umsetzt und die erhaltene Verbindung mit reduzierenden Mitteln behandelt.
Das so gewonnene p-Amino-benzolsul- fonylguanidin ist bekannt und soll therapeu tische Verwendung finden.
Die als Ausgangsstoffe verwendeten Thio- harnstoffe lassen sich leicht durch Konden sation der entsprechend p-substituierten Ben- zolsulfonsäurehalogenide mit S-substituierten Pseudo-thioharnstoffen bezw. ihren Salzen in Pyridin herstellen.
Beispiel: 29 Teile N-(p-Nitro-benzolsulfonyl)-S- äthyl-pseudo-thioharnstoff (dargestellt durch Kondensation von S-Äthyl-pseudo-thioharn- stoffhydrochloridmitp-Nitro-benzolsulfochlo- rid in Pyridin) werden mit 250 Teilen ver dünnter Ammoniaklösung und 50 Teilen Alko hol am Rückfluss gekocht, bis die Merkaptan- entwicklung beendet ist. Beim Erkalten schei det sich p-Nitro-benzolsulfonylguanidin kri stallisiert ab.
Dann wird ohne weitere Reini- gungmiteinerReduktionsmischung aus 20 Tei len feinem Eisenpulver, die mit 10 Teilen 2n-Salzsäure aasgeätzt sind, 200 Teilen Was ser und 200 Teilen Alkohol 3 Stunden am Rückfluss gekocht. Der Alkohol wird dann abdestilliert; man stellt durch Zusatz von Natronlauge auf lackmusalkalische Reaktion ein und nutscht ab.
Aus dem Filtrat kristalli siert beim Abkühlen p-Amino-benzolsulfonyl- guanidin aus. Zur Reinigung löst man in ver dünnter .Salzsäure, entfärbt mit Tierkohle, fällt mit Natronlauge und kristallisiert aus Wasser um. F. 188-190 .
Als Ausgangsstoff kann man statt p-Nitro- benzolsulfonyl - S-äthyl - pseudo-thioharnstoff auch p-Nitro-benzolsulfonyl-S-benzyl-pseudo- thioharnstoff verwenden, der durch Konden- sation von S-Benzyl-pseudo-thioharnstoff- hydrochlorid mit p-Nitro-benzolsulfochlorid in Pyridin erhalten wird.
Process for the preparation of p-amino-benzenesulfonylguanidine. The subject of the present patent is a process for the preparation of p-amino-benzenesulfonylguanidine, which is characterized in that an S-substituted benzenesulfonyl-pseudo-thiourea whose benzene nucleus in the p-position has a substituent which can be converted into the amino group by reduction contains, reacts with ammonia and treated the compound obtained with reducing agents.
The p-amino-benzenesulfonylguanidine obtained in this way is known and is intended to be used in therapy.
The thioureas used as starting materials can be easily bezw by condensation of the corresponding p-substituted benzene sulfonic acid halides with S-substituted pseudo-thioureas. make their salts in pyridine.
Example: 29 parts of N- (p-nitro-benzenesulfonyl) -S-ethyl-pseudo-thiourea (produced by condensation of S-ethyl-pseudo-thiourea hydrochloride with p-nitro-benzenesulfochloride in pyridine) are diluted with 250 parts Ammonia solution and 50 parts of alcohol are refluxed until the development of mercaptans has ended. On cooling, p-nitrobenzenesulfonylguanidine separates out in crystallized form.
Then, without further cleaning, it is refluxed with a reduction mixture of 20 parts of fine iron powder which has been etched with 10 parts of 2N hydrochloric acid, 200 parts of water and 200 parts of alcohol. The alcohol is then distilled off; you adjust by adding caustic soda to a litmus-alkaline reaction and suck off.
On cooling, p-Aminobenzenesulfonylguanidine crystallizes out of the filtrate. For cleaning, it is dissolved in dilute hydrochloric acid, decolorized with animal charcoal, precipitated with sodium hydroxide solution and recrystallized from water. F. 188-190.
Instead of p-nitrobenzenesulfonyl-S-ethyl-pseudo-thiourea, p-nitro-benzenesulfonyl-S-benzyl-pseudo-thiourea can be used as the starting material, which is formed by condensation of S-benzyl-pseudo-thiourea hydrochloride p-nitro-benzenesulfonyl chloride in pyridine is obtained.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH240581T | 1941-12-16 | ||
CH236130T | 1941-12-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH240581A true CH240581A (en) | 1945-12-31 |
Family
ID=25728067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH240581D CH240581A (en) | 1941-12-16 | 1941-12-16 | Process for the preparation of p-amino-benzenesulfonylguanidine. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH240581A (en) |
-
1941
- 1941-12-16 CH CH240581D patent/CH240581A/en not_active IP Right Cessation
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Legal Events
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PL | Patent ceased |