CH318358A - Process for the preparation of a pyrimidine derivative - Google Patents
Process for the preparation of a pyrimidine derivativeInfo
- Publication number
- CH318358A CH318358A CH318358DA CH318358A CH 318358 A CH318358 A CH 318358A CH 318358D A CH318358D A CH 318358DA CH 318358 A CH318358 A CH 318358A
- Authority
- CH
- Switzerland
- Prior art keywords
- chlorophenyl
- preparation
- amino
- pyrimidine derivative
- ethylpyrimidine
- Prior art date
Links
Landscapes
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
Procédé de préparation d'un dérivé de la pyrimidine La présente invention se rapporte à un pro cédé de préparation de la 2-amino-4-mercapto- 5-p-chlorophényl-6-éthylpyrimidine, qui, com me le composé 4-hydroxy préparé par le pro cédé du brevet principal, peut servir- à la pré paration de la 2,4-diamino-5-p-chlorophényl- 6-éthylpyrimidine.
Ce procédé est caractérisé .en ce qu'on traite une 2-amino-4 hydroxy-5-p-chlorophé- nyl-6-éthyldihydropyrimidine avec du penta- sulfure de phosphore.
La dihydropyrimidine peut être obtenue par condensation de la guanidine avec l'a-p- chlorophényl-fl-éthylacrylonitrile, pour donner une dihydropyrimidine qui peut avoir la struc ture représentée par les formules 1, II ou III.
EMI0001.0018
EMI0001.0019
<I>Exemple</I> On mélange 10 g de 2-amino-4-hydroxy-5- p-chlorophényl-6-éthyldihydropyrimidine avec 25 g de pentasulfure de phosphore et 70 ml de tétrahydronaphtalène. On chauffe le mélange pendant 2 heures à 170 - 1750 C.
Après re froidissement, on dilue le mélange avec de l'éther de pétrole et on filtre. On dissout le solide dans 200 ml d'eau contenant 50 ml d'hy droxyde d'ammonium concentré; Après traite ment de la solution au charbon de bois et fil tration, on précipite l'amino-mercapto-pyri- midine par addition d'un excès d'acide acéti que glacial. Le produit est cristallisé à nouveau dans le benzène et forme des prismes jaune pâle (5,1 g) qui fondent à 2310.
On obtient la même substance que par trai tement de la 2-amino-4-hydroxy-5 p-chloro- phényl-6-éthylpyrimidine avec le pentasulfure de phosphore, de la manière décrite plus haut.
Process for preparing a pyrimidine derivative The present invention relates to a process for preparing 2-amino-4-mercapto-5-p-chlorophenyl-6-ethylpyrimidine, which, like the 4-hydroxy compound prepared by the process of the main patent, can be used in the preparation of 2,4-diamino-5-p-chlorophenyl-6-ethylpyrimidine.
This process is characterized by treating a 2-amino-4 hydroxy-5-p-chlorophenyl-6-ethyldihydropyrimidine with phosphorus pentasulfide.
Dihydropyrimidine can be obtained by condensing guanidine with α-p-chlorophenyl-β-ethylacrylonitrile, to give a dihydropyrimidine which may have the structure represented by formulas 1, II or III.
EMI0001.0018
EMI0001.0019
<I> Example </I> 10 g of 2-amino-4-hydroxy-5-p-chlorophenyl-6-ethyldihydropyrimidine are mixed with 25 g of phosphorus pentasulfide and 70 ml of tetrahydronaphthalene. The mixture is heated for 2 hours at 170 - 1750 C.
After cooling, the mixture is diluted with petroleum ether and filtered. The solid is dissolved in 200 ml of water containing 50 ml of concentrated ammonium hydroxide; After treating the solution with charcoal and filtration, the amino-mercapto-pyridine is precipitated by the addition of an excess of glacial acetic acid. The product crystallizes again from benzene and forms pale yellow prisms (5.1 g) which melt at 2310.
The same substance is obtained as by treating 2-amino-4-hydroxy-5 p-chlorophenyl-6-ethylpyrimidine with phosphorus pentasulfide, as described above.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB314006X | 1952-04-01 | ||
CH314006T | 1953-04-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH318358A true CH318358A (en) | 1956-12-31 |
Family
ID=25735990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH318358D CH318358A (en) | 1952-04-01 | 1953-04-01 | Process for the preparation of a pyrimidine derivative |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH318358A (en) |
-
1953
- 1953-04-01 CH CH318358D patent/CH318358A/en unknown
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