CH210791A - Process for the preparation of a benzene sulfamide derivative. - Google Patents
Process for the preparation of a benzene sulfamide derivative.Info
- Publication number
- CH210791A CH210791A CH210791DA CH210791A CH 210791 A CH210791 A CH 210791A CH 210791D A CH210791D A CH 210791DA CH 210791 A CH210791 A CH 210791A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- sulfamide derivative
- benzene sulfamide
- benzene
- derivative
- Prior art date
Links
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- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung eines Benzolsnlfamidderivates. Gegenstand des vorliegenden Patentes bildet ein Verfahren zur Darstellung des im Patent Nr. 210776 beschriebenen Benzolsulf- amidderivates, welches dadurch gekennzeich net ist, dass man ein p-Halogen-benzolsu-1f- amid mit einem 2-Halogen-pyridin umsetzt und auf die erhaltene Verbindung Ammoniak einwirken lässt.
Die Reaktion wird in An- oder Abwesen heit von indifferenten Lösungsmitteln und zweckmässig in Gegenwart eines Katalysa- tors und/oder säurebindenden Mittels wie z. B. Kupferpulver, basischen Mitteln z. B. Alkalien wie Pottasche und dergl. vor genommen.
Beispiel: Eine Umsetzung von 19 Teilen p-Chlor- benzolsulfamid, 14 Teilen trockenem Ka- liumkarbonat, 16 Teilen 2-Brom-pyridin und 0,5 Teilen Kupferpulver werden im Ölbad innert 1 Stunde von 150 auf 200 erhitzt. Nach dem Erkalten wird die Schmelze in Wasser gelöst, filtriert und durch Zusatz von Säure das 2(p-Chlorbenzolsulfamido.)-pyridin gefällt.
Nach dem Absaugen wird das Pro- dukt gut gewaschen und noch feucht mit dem 5fachen Gewicht an konzentriertem Ammoniak im geschlossenen Gefäss bei Ge genwart von etwas Kupferchlorid während 10-15 Stunden auf 160-180' erhitzt. Nach dem Erkalten wird darr überschüssige Ammo niak abgetrieben und das ausfallende Pro dukt in verdünnter Natronlauge gelöst.
Nach dem Filtrieren wird die alkalische Lösung in überschüssige verdünnte Salzsäure ein- gerührt und wieder filtriert. Aus der sauren Lösung wird das 2-(p-Aminobenzolsulf- amido)-pyridin durch Neutralisieren mit Soda gefällt.
Process for the preparation of a benzene sulfamide derivative. The subject of the present patent is a process for the preparation of the benzenesulfamide derivative described in patent no. 210776, which is characterized in that a p-halo-benzenesu-1f-amide is reacted with a 2-halo-pyridine and on the obtained Compound allows ammonia to act.
The reaction is carried out in the presence or absence of inert solvents and advantageously in the presence of a catalyst and / or acid-binding agent such as. B. copper powder, basic agents z. B. Alkalis such as potash and the like. Taken before.
Example: A reaction of 19 parts of p-chlorobenzenesulfamide, 14 parts of dry potassium carbonate, 16 parts of 2-bromopyridine and 0.5 part of copper powder are heated from 150 to 200 within 1 hour in an oil bath. After cooling, the melt is dissolved in water, filtered and the 2 (p-chlorobenzenesulfamido.) - pyridine is precipitated by adding acid.
After suction, the product is washed thoroughly and, while still moist, heated to 160-180 ° for 10-15 hours with 5 times the weight of concentrated ammonia in a closed vessel in the presence of some copper chloride. After cooling, excess ammonia is expelled and the precipitated product is dissolved in dilute sodium hydroxide solution.
After filtering, the alkaline solution is stirred into excess dilute hydrochloric acid and filtered again. The 2- (p-aminobenzenesulfamido) pyridine is precipitated from the acidic solution by neutralizing it with soda.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH210429T | 1938-01-31 | ||
CH210791T | 1938-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH210791A true CH210791A (en) | 1940-07-31 |
Family
ID=25724877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH210791D CH210791A (en) | 1938-01-31 | 1938-01-31 | Process for the preparation of a benzene sulfamide derivative. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH210791A (en) |
-
1938
- 1938-01-31 CH CH210791D patent/CH210791A/en unknown
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