DE950639C - Process for the preparation of 2-mercapto-1-ox-3, 4-diazoles substituted exclusively in the 5-position - Google Patents

Process for the preparation of 2-mercapto-1-ox-3, 4-diazoles substituted exclusively in the 5-position

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Publication number
DE950639C
DE950639C DEF12656A DEF0012656A DE950639C DE 950639 C DE950639 C DE 950639C DE F12656 A DEF12656 A DE F12656A DE F0012656 A DEF0012656 A DE F0012656A DE 950639 C DE950639 C DE 950639C
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Germany
Prior art keywords
mercapto
diazoles
preparation
exclusively
substituted
Prior art date
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Expired
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DEF12656A
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German (de)
Inventor
Dr Hans-Bodo Koenig
Dr Werner Siefken
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Bayer AG
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Bayer AG
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Publication date
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Priority to DEF12656A priority Critical patent/DE950639C/en
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Publication of DE950639C publication Critical patent/DE950639C/en
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D271/00Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
    • C07D271/02Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
    • C07D271/101,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles
    • C07D271/1131,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Description

Verfahren zur Herstellung von ausschließlich in 5-Stellung substituierten 2-Mercapto-l-ox-3, 4-diazolen Ausschließlich in der 5-Stellung substituierte 2-Mercapto-r-ox-3, 4-diazole waren bisher nur durch Einwirkung von Thiophosgen auf Carbonsäurehydrazide dargestellt worden (Ber. 2r, 2466 [r888] und schweizerische Patentschrift 213 o52). Da Thiophosgen ein nicht allgemein zugängliches und zudem unangenehm zu handhabendes Agenz ist, besteht ein Interesse, es bei der Darstellung von Mercapto-ox-diazolen durch eine zweckmäßigere Schwefelverbindung zu ersetzen.Process for the preparation of exclusively substituted in the 5-position 2-Mercapto-l-ox-3, 4-diazoles Exclusively in the 5-position substituted 2-mercapto-r-ox-3, So far, 4-diazoles have only been produced by the action of thiophosgene on carboxylic acid hydrazides (Ber. 2r, 2466 [r888] and Swiss patent specification 213 052). Since thiophosgene is not generally accessible and also unpleasant to use There is an interest in the preparation of mercapto-ox-diazoles to be replaced by a more appropriate sulfur compound.

Es wurde nun gefunden, daß man in einfacher Weise zu den, in der S-Stellung substituierten 2-Mercapto-r-ox-3, 4-diazolen gelangt, wenn man Hvdrazide von aromatischen oder heterocvclischeii Carbonsäuren in Gegenwart einer basischen Verbindung bei erhöhter Temperatur in einem inerten Verdünnungsmittel mit Schwefelkohlenstoff umsetzt. Die verfahrensgemäß erhältlichen Verbindungen sollen als Heilmittel und als Zwischenprodukte zur Herstellung von Heilmitteln Verwendung finden.It has now been found that in a simple manner to the, in the S-position substituted 2-mercapto-r-ox-3, 4-diazoles is obtained when one hvdrazides of aromatic or heterocyclic carboxylic acids in the presence of a basic compound Reacts elevated temperature in an inert diluent with carbon disulfide. The compounds obtainable according to the process are said to be used as medicaments and as intermediates for the production of medicinal products use.

Als Carbonsäurehydrazide werden die Hydrazide von aromatischen oder heterocyclischen Carbonsäuren verwendet. Als Beispiele seien das Benzoesäurehydrazid und das Isonicotinsäurehydrazid erwähnt. Als basisch reagierende Zusätze kommen z. B. Alkalicarbonate in Frage. Zur Vollendung der Reaktion ist außerdem in einzelnen Fällen der Zusatz eines Schwermetallsalzes, wie Bleiacetat, erforderlich, besonders dann, wenn die Reaktion nicht in einem Schritt zur Ringbildung führt, sondern ein ringoffenes Zwischenprodukt infolge seiner Schwerlöslichkeit isoliert werden kann.As carboxylic acid hydrazides, the hydrazides of aromatic or heterocyclic carboxylic acids used. Examples are benzoic acid hydrazide and isonicotinic hydrazide. Come as basic reacting additives z. B. alkali carbonates in question. To complete the reaction is also in individual Cases of Addition of a heavy metal salt, such as lead acetate, required, especially if the reaction does not lead to ring formation in one step, but an intermediate product that is open to the ring is isolated due to its poor solubility can be.

Beispiel i Die Mischung von 68 g Benzhydrazid, 35 g wasserfreies Kaliumcarbonat, 4o g Schwefelkohlenstoff und 50o ccm Methanol wird in einem Bad von etwa 6o°' so lange unter Rückflußkühlung erhitzt, bis die Gasentwicklung beendet ist. Dann wird die Lösung zweckmäßig unter etwas vermindertem Druck stark eingeengt, das ausgefallene Kaliumsalz des 2-Mercapto-i-ox-5-phenyl-3, 4-diazols abgesaugt und aus Methanol mit Äther umgefälilt. Schmp. 296= (Zers.), Ausbeute 51 g. Aus wäßriger Lösung erhält man durch Zusatz von Säuren leicht das freie Mercapto,phenyl-oxdiazol. Es ist in allen üblichen organischer. Lösungsmitteln gut löslich, mit Ausnahme von Petroläther. Man kann. es z. B. aus Methanol, Äthanol oder Aceton mit Wasser umfällen. Schmp. 222'o'. Beispiel :2 Die Mischung von 13,7 g Isonicotinsäurehydrazid, 7 g wasserfreiem Kal'iumcarbonat, io g Schwefelkohlenstoff und ioo ccm Methanol wird., nachdem die erste Reaktion abgeklungen ist, bis zur vollständigen Beendigung der Umsetzung unter RückflußküWung in einem Bad von 6o°' erhitzt. Nach dem Erkalten wird das Reaktionsprodukt abgesaugt. Ausbeute 22 g.Example i The mixture of 68 g benzhydrazide, 35 g anhydrous potassium carbonate, 40 g of carbon disulfide and 50 ° cc of methanol are added to a bath of about 60 ° heated under reflux for a long time until the evolution of gas has ceased. Then it will be the solution is expediently strongly concentrated under somewhat reduced pressure, the precipitated The potassium salt of 2-mercapto-i-ox-5-phenyl-3, 4-diazole and extracted from methanol precipitated with ether. M.p. 296 = (decomp.), Yield 51 g. Obtained from aqueous solution the free mercapto, phenyl-oxdiazole can easily be obtained by adding acids. It is in all usual organic. Soluble in solvents, with the exception of petroleum ether. One can. it z. B. reprecipitate from methanol, ethanol or acetone with water. M.p. 222'o '. Example: 2 The mixture of 13.7 g of isonicotinic acid hydrazide, 7 g of anhydrous Potassium carbonate, 10 g carbon disulfide and 100 cc methanol are added first reaction has subsided until the completion of the implementation under Reflux cooling in a bath heated to 60 °. After cooling, the reaction product is sucked off. Yield 22g.

a) 22 g dieses Reaktionsproduktes werden mit 33 g Bleiacetattrihydrat, 7,5 9 Natriumbicarbonat und 25o ccm Wasser für etwa 5 Stunden in einem Bad von ioo' erhitzt. Nach dem Erkalten wird der schwarze Niederschlag abgesaugt und wiederholt mit heißem Wasser extrahiert. Aus den erkalteten wäßrigen Auszügen kristallisiert das 5-y-Pyridylz-mercapto-i-ox-3, 4-diazol in gelben Nadeln.. Schmp. 271° (Zens.). Ausbeute über 65% der Theorie.a) 22 g of this reaction product with 33 g of lead acetate trihydrate, 7.5 9 sodium bicarbonate and 25o cc of water are heated for about 5 hours in a bath of ioo '. After cooling, the black precipitate is filtered off with suction and extracted repeatedly with hot water. The 5-γ-pyridylz-mercapto-i-ox-3, 4-diazole crystallizes in yellow needles from the cooled aqueous extracts .. Mp. 271 ° (Zens.). Yield over 65% of theory.

b) io g des Reaktionsproduktes von Isonicotinsäurehydrazid, Schwefelkohlenstoff und Ka:liumcarbonat werden in Gegenwart von 5,5 g wasserfreiem Kaliumca,rbonat in 125 ccm Wasser :2 Stunden unter Rückfluß zum Sieden erhitzt. Nach dem Erkalten, wird mit Säure neutralisiert, wobei das Pyridylmercapto-ox-diazol als gelber kristalliner .Niederschlag erscheint. Ausbeute 57% der Theorie, Schmp. 271e (Zers.).b) 10 g of the reaction product of isonicotinic acid hydrazide, carbon disulfide and potassium carbonate are in the presence of 5.5 g of anhydrous potassium carbonate in 125 ccm of water: heated to boiling under reflux for 2 hours. After cooling down, is neutralized with acid, whereby the pyridyl mercapto-ox-diazole as a yellow crystalline Precipitation appears. Yield 57% of theory, melting point 271e (decomp.).

Claims (2)

PATENTANSPRÜCHE- i. Verfahren zur Herstellung von ausschließlich in 5-Stellung substituierten 2-Mercapto-1-0x-3, 4-diazolen, dadurch gekennzeichnet, daß man Hydrazide von aromatischen oder heterocyclischen Carbonsäuren in Gegenwart einer ba#,:schen Verbindung bei erhöhter Temperatur in einem inerten Lösungs- bzw. Verdünnungsmittel mit Schwefelkohlenstoff umsetzt. PATENT CLAIMS- i. Process for the preparation of 2-mercapto-1-0x-3, 4-diazoles which are exclusively substituted in the 5-position, characterized in that hydrazides of aromatic or heterocyclic carboxylic acids in the presence of a basic compound at elevated temperature in an inert Reacts solvents or diluents with carbon disulfide. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß bei der Umsetzung ein Schwermetallsalz, wie Bleiacetat, zugegen ist. In Betracht gezogene Druckschriften: Ber. dtsch. chem. Ges., 82, S. i21 bis 123 [19491, 21, S. 2466 b-is 2469 [i888]; schweizerische Patentschrift Nr. 213 o52.2. The method according to claim i, characterized in that a heavy metal salt, such as lead acetate, is present. Considered publications: Ber. German chem. Ges., 82, pp. i21 to 123 [19491, 21, p. 2466 b-is 2469 [i888]; Swiss patent no. 213 o52.
DEF12656A 1953-08-21 1953-08-21 Process for the preparation of 2-mercapto-1-ox-3, 4-diazoles substituted exclusively in the 5-position Expired DE950639C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF12656A DE950639C (en) 1953-08-21 1953-08-21 Process for the preparation of 2-mercapto-1-ox-3, 4-diazoles substituted exclusively in the 5-position

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DEF12656A DE950639C (en) 1953-08-21 1953-08-21 Process for the preparation of 2-mercapto-1-ox-3, 4-diazoles substituted exclusively in the 5-position

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DE950639C true DE950639C (en) 1956-10-11

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH213052A (en) * 1939-04-26 1941-01-15 Geigy Ag J R Process for the preparation of a 2-undecyl-4- (o-tolyl) -1: 3: 4-oxdiazolon (-5) sulfonic acid.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH213052A (en) * 1939-04-26 1941-01-15 Geigy Ag J R Process for the preparation of a 2-undecyl-4- (o-tolyl) -1: 3: 4-oxdiazolon (-5) sulfonic acid.

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