CH269986A - Process for the preparation of a derivative of 3,5-dioxo-pyrazolidine. - Google Patents
Process for the preparation of a derivative of 3,5-dioxo-pyrazolidine.Info
- Publication number
- CH269986A CH269986A CH269986DA CH269986A CH 269986 A CH269986 A CH 269986A CH 269986D A CH269986D A CH 269986DA CH 269986 A CH269986 A CH 269986A
- Authority
- CH
- Switzerland
- Prior art keywords
- dioxo
- derivative
- pyrazolidine
- preparation
- parts
- Prior art date
Links
Description
Verfahren zur Herstellung eines Derivates des 3,5-Dioxo-pyrazolidins. (legeristand vorlie;-enden Patentes ist ein Verfahren zur Herstellung eines Derivates des 3,a-Uioto-py razolidins. Das Verfahren ist da- durch gekeiiiizeicliiiet, dass man eine den Rest.
EMI0001.0013
abgebende Verbindung, wie z.
B. einen Di- ester, ein Dihalogenid oder ein Esterhalogenid der Beiizyl-nialonsäure, mit einer Verbindung der Formel
EMI0001.0022
wobei _i einen sich bei der Reaktion abspal tenden Rest bedeutet, wie z. B. mit Hydrazo- benzol oder einem N- Aey lderivat desselben, umsetzt. Die Umsetzung erfolgt zweckmässig in Gegenwart eines Kondensationsmittels bzw.
eines säurebindenden Mittels.
Die erhaltene neue Verbindung, das 1,2 1)iphenyl-3, 5-clioxo-4-benzyl-pyrazolidin, zeigt einen Selmmelzpunkt von 136-138". Sie soll therapeutische Verwendung finden.
<I>Beispiel 1:</I> Man löst 7,6 Teile Natrium in 1.90 VOluni- teilen absolutem Alkohol, gibt 75 Teile Benzyl- malorisäure-diäthylester -und 55 Teile Hydrazo- benzol züi, destilliert den Alkohol langsam ab und erhitzt dann 1-2 Stunden bei einer Ba.d- temperatur von 150 , am Schl uss im Vakuum,
bis kein Alkohol mehr abdestilliert. Man löst in Wasser, klärt mit etwas Kohle und versetzt langsam mit 15 % iger Salzsäure bis zur sauren Reaktion auf Kongopapier. Das 1.,2- Diphenyl - 3,5 - clioxo-4-benzyl - pyrazolidin fällt dabei als rasch kristallisierendes Öl aus.
A<B>A</B> us Alkohol kristallisiert es in farblosen Na- deln vom Schmelzpunkt. 136-138 . Das gleiche 1,2-Diphenyl-3,5-dioxo-4-ben- zyl-pyrazolidin erhält. man auch, wenn man das Hy drazobenzol durch 68 Teile N-Acetyl- hydrazobenzol ersetzt und im übrigen gleich verfährt. Bei dieser Ausführungsform bilden sich etwas weniger gefärbte Nebenprodukte.
Die Ausbeute ist ebenfalls gut. <I>Beispiel</I> Zu einer Mischung von 50 Teilen absolu tem Pyridin und 200 Volumteilen absolutem Äther tropft man bei etwa 0 21 Teile Benzyl- malonsäure-dichlorid, gibt dann 18 Teile 11ydrazobenzo1, gelöst in 1.00 Volumteilen Äther,
hinzu und rührt zwei Stunden bei Zimmertemperatur. Die Lösung wird zunächst zur Entfernung des Pyridins mit 2n-Salzsäure # ai -is-esehüttelt, n hierauf mit. 2n-Natriumcarbo- natlösung. Die Natriumearbonatlösung, welche das Natriumsalz des 1,2-Diphenyl-3,5-dioxo- 4-benzyl-pyrazoliclins gelöst enthält,
wird mit 10 % iger Salzsäure angesäuert, wobei sich das freie Pyrazolidinderivat ausscheidet.
Process for the preparation of a derivative of 3,5-dioxo-pyrazolidine. (The present patent is a process for the production of a derivative of 3, a-uioto-pyrazolidine. The process is not possible because one of the rest.
EMI0001.0013
issuing connection, such as
B. a diester, a dihalide or an ester halide of Beiizylnialonsäure, with a compound of the formula
EMI0001.0022
where _i means a residue that splits off in the reaction, such as. B. with hydrazzo benzene or an N-Aey lderivat thereof, reacted. The reaction is conveniently carried out in the presence of a condensing agent or
an acid binding agent.
The new compound obtained, 1,2 1) iphenyl-3, 5-clioxo-4-benzyl-pyrazolidine, has a melting point of 136-138 ". It is said to find therapeutic use.
Example 1: 7.6 parts of sodium are dissolved in 1.90 parts by volume of absolute alcohol, 75 parts of benzyl maloric acid diethyl ester and 55 parts of hydrazobenzene are added, the alcohol is slowly distilled off and then heated 1-2 hours at a bath temperature of 150, at the end in a vacuum,
until no more alcohol distills off. It is dissolved in water, clarified with a little charcoal and slowly mixed with 15% hydrochloric acid until an acidic reaction on Congo paper. The 1, 2-diphenyl-3,5-clioxo-4-benzyl-pyrazolidine precipitates out as a rapidly crystallizing oil.
A <B> A </B> us alcohol crystallizes in colorless needles with a melting point. 136-138. The same 1,2-diphenyl-3,5-dioxo-4-benzylpyrazolidine is obtained. the same is true if the hy-drazobenzene is replaced by 68 parts of N-acetylhydrazobenzene and the rest of the procedure is the same. In this embodiment, slightly less colored by-products are formed.
The yield is also good. <I> Example </I> To a mixture of 50 parts of absolute pyridine and 200 parts by volume of absolute ether, 21 parts of benzyl malonic acid dichloride are added dropwise at about 0.21 parts by volume of ether,
and stir for two hours at room temperature. To remove the pyridine, the solution is first shaken with 2N hydrochloric acid ai -is-esehüttelt, then with it. 2N sodium carbonate solution. The sodium carbonate solution, which contains the sodium salt of 1,2-diphenyl-3,5-dioxo-4-benzyl-pyrazoliclin dissolved,
is acidified with 10% hydrochloric acid, the free pyrazolidine derivative separating out.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH267222T | 1948-03-22 | ||
CH269986T | 1948-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH269986A true CH269986A (en) | 1950-07-31 |
Family
ID=25730946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH269986D CH269986A (en) | 1948-03-22 | 1948-03-22 | Process for the preparation of a derivative of 3,5-dioxo-pyrazolidine. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH269986A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2674600A (en) * | 1954-04-06 | Derivatives of j | ||
US2909465A (en) * | 1952-09-18 | 1959-10-20 | Knoll Ag | 1, 4-diphenyl-3, 5-diketo pyrazolidine compounds and compositions |
-
1948
- 1948-03-22 CH CH269986D patent/CH269986A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2674600A (en) * | 1954-04-06 | Derivatives of j | ||
US2909465A (en) * | 1952-09-18 | 1959-10-20 | Knoll Ag | 1, 4-diphenyl-3, 5-diketo pyrazolidine compounds and compositions |
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