CH269085A - Process for the preparation of a new hydrazine compound. - Google Patents
Process for the preparation of a new hydrazine compound.Info
- Publication number
- CH269085A CH269085A CH269085DA CH269085A CH 269085 A CH269085 A CH 269085A CH 269085D A CH269085D A CH 269085DA CH 269085 A CH269085 A CH 269085A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- new
- hydrazine compound
- parts
- compound
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
- C07D237/26—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings condensed with carbocyclic rings or ring systems
- C07D237/30—Phthalazines
- C07D237/34—Phthalazines with nitrogen atoms directly attached to carbon atoms of the nitrogen-containing ring, e.g. hydrazine radicals
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung einer neuen Hydrazinverbindung. Gegenstand des vorliegenden Patentes ist ein Verfahren zur Herstellung eines neuen Ilydrazons, das dadurch gekennzeichnet ist, dass man eine Verbindung der Formel
EMI0001.0004
worin R einen austauschfähigen Substituenten, z. B. eine veresterte Oxygruppe, besonders ein Halogenatom, oder eine Phenoxy- oder Thioäthergruppe, bedeutet, mit Hydrazin und das erhaltene 1-Hydrazino-phthalazin mit Brenztraubensäure umsetzt.
Das so erhaltene Phthalazinylhydrazon der Brenztraubensäure ist neu und schmilzt bei 180 (Zers.). Es bewirkt eine starke und langandauernde Blutdrucksenkung und soll als Heilmittel Verwendung finden. Beispiel: 30 Gewichtsteile Phthalazon werden in be kannter Weise in 1-Chlor-phthalazin überge führt. Die frisch gewonnene, noch feuchte Chlorverbindung wird in einem Gemisch von. 100 Volumteilen Alkohol und 90 Volumteilen Hydrazinhydrat 2 Stunden auf dem Wasser- bad erhitzt.
Nach allfälligem Filtrieren- kri stallisiert beim Erkalten das 1-pIydrazino- phthalazin der Formel
EMI0001.0025
in gelben Nädelchen aus. Es wird abgesaugt und mit kaltem Alkohol gewaschen. Die Aus beute beträgt 20-25 Gewichtsteile. Die neue Verbindung kann aus Methylalkohol umkri stallisiert werden und schmilzt, rasch erhitzt, bei 172-173 .
Durch Erwärmen in alkoho lischer oder wässriger Salzsäure erhält man das Hydrochlorid vom F. 273 (Zers.). Es löst sich bei Zimmertemperatur zu etwa 3 % in Wasser. Das mit verdünnter Schwefelsäure gewonnene Sulfat ist etwas leichter löslich, noch leichter das mit Methansu).fonsäure ge wonnene Salz.
An Stelle des 1-Chlor-phthalazins kann auch 1-Phenoxyphthalazin (F. 107 ; auf übliche Art erhältlich) verwendet werden, wobei die Umsetzung zweckmässig bei höherer Temperatur erfolgt.
8 Gewichtsteile 1-Hydrazino-phthalazin, in 100 Volumteilen warmem Methanol gelöst, werden mit 8,3 Gewichtsteilen Brenztrauben- säure versetzt. Beim Erwärmen kristallisiert das Reaktiönsprodakt der Formel
EMI0002.0002
in gelben Kristallen vom F. 1S0 (unter Zer setzung) aus. Sie sind in wässriger Natrium bicarbonatlösung leicht löslich.
Process for the preparation of a new hydrazine compound. The present patent relates to a process for the preparation of a new Ilydrazone, which is characterized in that a compound of the formula
EMI0001.0004
wherein R is an exchangeable substituent, e.g. B. an esterified oxy group, especially a halogen atom, or a phenoxy or thioether group, means with hydrazine and the 1-hydrazino-phthalazine obtained is reacted with pyruvic acid.
The phthalazinyl hydrazone of pyruvic acid obtained in this way is new and melts at 180 (decomp.). It causes a strong and long-lasting lowering of blood pressure and is said to be used as a remedy. Example: 30 parts by weight of phthalazone are converted into 1-chloro-phthalazine in a known manner. The freshly obtained, still moist chlorine compound is in a mixture of. Heat 100 parts by volume of alcohol and 90 parts by volume of hydrazine hydrate on a water bath for 2 hours.
After any filtration, the 1-pIydrazino-phthalazine of the formula crystallizes on cooling
EMI0001.0025
in yellow needles. It is suctioned off and washed with cold alcohol. The yield is 20-25 parts by weight. The new compound can be recrystallized from methyl alcohol and melts, heated rapidly, at 172-173.
The hydrochloride of F. 273 (decomp.) Is obtained by heating in alcoholic or aqueous hydrochloric acid. It dissolves about 3% in water at room temperature. The sulphate obtained with dilute sulfuric acid is somewhat more soluble, and the salt obtained with methanesulfonic acid is even more readily soluble.
Instead of 1-chlorophthalazine, 1-phenoxyphthalazine (F. 107; available in the usual way) can also be used, the reaction advantageously taking place at a higher temperature.
8 parts by weight of 1-hydrazino-phthalazine, dissolved in 100 parts by volume of warm methanol, are mixed with 8.3 parts by weight of pyruvic acid. When heated, the reaction product of the formula crystallizes
EMI0002.0002
in yellow crystals from F. 1S0 (with decomposition). They are easily soluble in aqueous sodium bicarbonate solution.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH269085T | 1946-11-29 | ||
CH266231T | 1946-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH269085A true CH269085A (en) | 1950-06-15 |
Family
ID=25730850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH269085D CH269085A (en) | 1946-11-29 | 1946-11-29 | Process for the preparation of a new hydrazine compound. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH269085A (en) |
-
1946
- 1946-11-29 CH CH269085D patent/CH269085A/en unknown
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