CH220137A - Process for the preparation of 2- (para-amino-benzene-sulfamido) -4-methyl-thiazol. - Google Patents
Process for the preparation of 2- (para-amino-benzene-sulfamido) -4-methyl-thiazol.Info
- Publication number
- CH220137A CH220137A CH220137DA CH220137A CH 220137 A CH220137 A CH 220137A CH 220137D A CH220137D A CH 220137DA CH 220137 A CH220137 A CH 220137A
- Authority
- CH
- Switzerland
- Prior art keywords
- methyl
- benzene
- amino
- thiazol
- para
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
- C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
- C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three 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, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D277/38—Nitrogen atoms
- C07D277/50—Nitrogen atoms bound to hetero atoms
- C07D277/52—Nitrogen atoms bound to hetero atoms to sulfur atoms, e.g. sulfonamides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Thiazole And Isothizaole Compounds (AREA)
Description
Procédé de préparation du 2-(para-amino-benzène-sulfamido)-4-méthyl-thiazol. La présente invention a pour objet un procédé de préparation du 2-(para-amino-ben- zène-sulfamido)-4-métliyl-thiazol, ayant pour formule
EMI0001.0004
Ce composé fond à 240-2410 C. Il est peu soluble dans l'eau; il présente des pro priétés bactéricides marquantes et est sus ceptible d'applications thérapeutiques.
Le procédé selon l'invention est caracté risé en ce que l'on fait réagir le 2-amino-4- méthyl-thiazol avec un halogénure de para- lialogéno-benzéne-sulfonyle, de manière à for mer, par élimination d'halogénure d'hydrogène, le 2-(para-halogéno-benzène-sulfamido)-4-mé, thyl-thiazol, puis en ce que l'on traite ce der nier corps avec de l'ammoniaque pour rem placer l'halogène par un groupe amino, de façon à obtenir le 2-(para-amino-benzène-sulf- aniido)
-4-méthyl-thiazol. L'exemple suivant montre comment le procédé selon l'invention peut être mis en pratique 7,5 gr de chlorhydrate de 2-amino-4-méthyl- thiazol sont finement pulvérisés et mis en suspension dans 13 cc. de pyridine sèche;
on ajoute alors lentement à une température de 30-40 0 C, 15 gr de p-bromo-benzène- sulfochlorure. Après chauffage pendant quel ques minutes au bain de vapeur pour com pléter la réaction, l'ensemble est versé dans un grand excès d'eau et le produit obtenu est broyé en présence d'acide acétique aqueux à 50 % pour éliminer les sous-produits gom- meux. Le 2-(para-bromo-benzéne-sulfamido)
- 4-méthyl-thiazol ainsi obtenu est recristallisé dans l'acide acétique dilué et a un point de fusion de 165-166 C.
Le composé bromé est mélangé avec 10 volumes d'ammoniaque aqueuse (d = 0,880) et '/2o de son poids de chlorure cuivreux; le mélange est chauffé en vase clos à 120 0. On filtre et on élimine l'excès d'ammoniaque par ébullition, le 2.(para.amino.benzèiie-sulfamido)- 4-niéthyl-thiazol se sépare après élimination des faibles impuretés gommeuses et on le purifie par cristallisation à partir de plusieurs solvants (tels que l'acétone ou le niétliylgly- col),
ou par précipitation du sel de sodium par un excès de soude caustique ou par sa turation avec le chlorure de sodium et libé ration du produit pur par addition d'acide. Le produit pur est une poudre cristalline blanche (P.F. 240-?41 C).
Process for the preparation of 2- (para-amino-benzene-sulfamido) -4-methyl-thiazol. The present invention relates to a process for the preparation of 2- (para-amino-benzene-sulfamido) -4-methyl-thiazol, having the formula
EMI0001.0004
This compound melts at 240-2410 C. It is sparingly soluble in water; it has outstanding bactericidal properties and is susceptible to therapeutic applications.
The process according to the invention is characterized in that the 2-amino-4-methyl-thiazol is reacted with a paralialogeno-benzenesulfonyl halide, so as to form, by elimination of the halide. hydrogen, 2- (para-halo-benzene-sulfamido) -4-me, thyl-thiazol, then in that this last body is treated with ammonia to replace the halogen with a amino group, so as to obtain 2- (para-amino-benzene-sulf- aniido)
-4-methyl-thiazol. The following example shows how the process according to the invention can be carried out in practice 7.5 g of 2-amino-4-methyl-thiazol hydrochloride are finely pulverized and suspended in 13 cc. dry pyridine;
is then added slowly at a temperature of 30-40 0 C, 15 g of p-bromo-benzene-sulfochloride. After heating for a few minutes in a steam bath to complete the reaction, the whole is poured into a large excess of water and the product obtained is ground in the presence of 50% aqueous acetic acid to remove the by-products. chewy. 2- (para-bromo-benzenesulfamido)
- 4-methyl-thiazol thus obtained is recrystallized from dilute acetic acid and has a melting point of 165-166 C.
The brominated compound is mixed with 10 volumes of aqueous ammonia (d = 0.880) and '/ 2o of its weight of cuprous chloride; the mixture is heated in a closed vessel to 120 ° C. One filters and eliminates the excess ammonia by boiling, the 2. (para.amino.benzèiie-sulfamido) - 4-niethyl-thiazol separates after removal of the weak impurities gummy and purified by crystallization from several solvents (such as acetone or nietliylglycol),
or by precipitation of the sodium salt with an excess of caustic soda or by its purification with sodium chloride and liberation of the pure product by addition of acid. The pure product is a white crystalline powder (m.p. 240-? 41 C).
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB220137X | 1938-09-15 | ||
CH218231T | 1939-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH220137A true CH220137A (en) | 1942-03-15 |
Family
ID=25726129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH220137D CH220137A (en) | 1938-09-15 | 1939-06-01 | Process for the preparation of 2- (para-amino-benzene-sulfamido) -4-methyl-thiazol. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH220137A (en) |
-
1939
- 1939-06-01 CH CH220137D patent/CH220137A/en unknown
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