CH397696A - Process for the preparation of 5-chloro-4-amino-2,6-dimethylpyrimidine - Google Patents
Process for the preparation of 5-chloro-4-amino-2,6-dimethylpyrimidineInfo
- Publication number
- CH397696A CH397696A CH382162A CH382162A CH397696A CH 397696 A CH397696 A CH 397696A CH 382162 A CH382162 A CH 382162A CH 382162 A CH382162 A CH 382162A CH 397696 A CH397696 A CH 397696A
- Authority
- CH
- Switzerland
- Prior art keywords
- mol
- hydrochloric acid
- kyanmethine
- dimethylpyrimidine
- chlorination
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
- C07D239/32—One oxygen, sulfur or nitrogen atom
- C07D239/42—One nitrogen atom
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von 5-Chlor-4amino 2, 6-dimethylpyrimidin
Bekanntlich ist die direkte Chlorierung des 4 Amino-2, 6-dimethylpyrimidins (Kyanmethin) bereits von A. G. Bayer (Ber. dtsch. chem. Ges. 4, 176-178) durchgeführt worden. Bei dieser Umsetzung im wässrigen Medium treten jedoch starke Zersetzungserscheinungen auf, so dass unter günstigsten Reaktionsbedingungen nur Ausbeuten von maximal 63 o/o erreicht werden können.
Es wurde nun gefunden, dass die Nebenreaktionen weitestgehend zurückgedrängt werden können und damit gute Ausbeuten erhalten werden, wenn die Chlorierung des Kyanmethins in saurer Lösung durchgeführt wird.
Wird für die Umsetzung z. B. Salzsäure verwendet, so ist auf 1 Mol Kyanmethin mindestens 1 Mol Salzsäure einzusetzen, wobei 86 O/o Ausbeute erhalten werden. Werden die Salzsäuremengen erhöht, so steigen auch die Ausbeuten an. Bei Verwendung von 1,1 Mol Salzsäure auf 1 Mol Kyanmethin werden Ausbeuten von 91 O/o erhalten, während bei Anwendung von 2 Mol Salzsäure sogar über 97 O/o erreicht werden.
Zweckmässig wird die wässrige Lösung des Kyanmethins mit Salzsäure versetzt und bei Temperaturen von 20-600 C die theoretische Menge Chlor eingeleitet. Durch Zusatz von Alkalien wird nach der Umsetzung das 5-Chlor-4-amino-2, 6-dimethyl-pyrimidin abgeschieden. Das isolierte und getrocknete Rohprodukt kann im allgemeinen ohne vorherige Reinigung für weitere Umsetzungen verwendet werden, gegebenenfalls lässt es sich aus Wasser umkristallisieren.
Beispiel
123 g (1 Mol) Kyanmethin werden in 500ml Wasser gelöst und mit 120 g 350/oiger Salzsäure (1,15 Mol) versetzt. Die Lösung wird auf 55" C erhitzt und anschliessend innerhalb von 3 Stunden 71 g (1 Mol) Chlor eingeleitet. Nach einstündigem Nachrühren wird das Reaktionsgemisch mit 200 g 500/obiger Natronlauge versetzt, wobei das 5-Chlor-4-amino-2, 6- dimethyl-pyrimidin ausfällt. Das abgetrennte und ge trocknete Produkt schmilzt bei 164-166 C. Ausbeute: 147 g = 93,4 O/o der Theorie.
PATENTANSPRUCH
Verfahren zur Herstellung von 5-Chlor-4-amino2,6-dimethyl-pyrimidin durch Chlorierung von 4 Amino-2, 6-dimethyl-pyrimidin, dadurch gekennzeichnet, dass die Chlorierung in saurem Medium durchgeführt wird.
**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.
Process for the preparation of 5-chloro-4amino 2,6-dimethylpyrimidine
It is known that the direct chlorination of 4 amino-2,6-dimethylpyrimidine (kyanmethine) has already been carried out by A. G. Bayer (Ber. Dtsch. Chem. Ges. 4, 176-178). In this reaction in an aqueous medium, however, severe decomposition phenomena occur, so that under the most favorable reaction conditions only yields of a maximum of 63 o / o can be achieved.
It has now been found that the side reactions can be suppressed to the greatest possible extent and thus good yields are obtained if the chlorination of the kyanmethine is carried out in acidic solution.
Is for the implementation z. If, for example, hydrochloric acid is used, at least 1 mol of hydrochloric acid must be used for 1 mol of kyanomethine, with a yield of 86%. If the amounts of hydrochloric acid are increased, the yields also increase. When using 1.1 mol of hydrochloric acid to 1 mol of kyanomethine, yields of 91% are obtained, while when using 2 mol of hydrochloric acid, even more than 97% are achieved.
The aqueous solution of the kyanmethine is expediently mixed with hydrochloric acid and the theoretical amount of chlorine is passed in at temperatures of 20-600.degree. After the reaction, the 5-chloro-4-amino-2,6-dimethyl-pyrimidine is deposited by adding alkalis. The isolated and dried crude product can generally be used for further reactions without prior purification; if appropriate, it can be recrystallized from water.
example
123 g (1 mol) of kyanmethine are dissolved in 500 ml of water, and 120 g of 350% hydrochloric acid (1.15 mol) are added. The solution is heated to 55 ° C. and then 71 g (1 mole) of chlorine are passed in over the course of 3 hours. 6-dimethylpyrimidine precipitates The separated and dried product melts at 164-166 ° C. Yield: 147 g = 93.4% of theory.
PATENT CLAIM
Process for the preparation of 5-chloro-4-amino2,6-dimethyl-pyrimidine by chlorination of 4-amino-2, 6-dimethyl-pyrimidine, characterized in that the chlorination is carried out in an acidic medium.
** WARNING ** End of DESC field could overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD7703561 | 1961-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH397696A true CH397696A (en) | 1965-08-31 |
Family
ID=5477688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH382162A CH397696A (en) | 1961-12-01 | 1962-03-28 | Process for the preparation of 5-chloro-4-amino-2,6-dimethylpyrimidine |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH397696A (en) |
-
1962
- 1962-03-28 CH CH382162A patent/CH397696A/en unknown
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