DE1670139A1 - Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4.3-a] pyridine derivatives - Google Patents

Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4.3-a] pyridine derivatives

Info

Publication number
DE1670139A1
DE1670139A1 DE19661670139 DE1670139A DE1670139A1 DE 1670139 A1 DE1670139 A1 DE 1670139A1 DE 19661670139 DE19661670139 DE 19661670139 DE 1670139 A DE1670139 A DE 1670139A DE 1670139 A1 DE1670139 A1 DE 1670139A1
Authority
DE
Germany
Prior art keywords
triazolo
nitrofuryl
pyridine derivatives
pyridine
preparation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE19661670139
Other languages
German (de)
Inventor
Stach Dr-Ing Kurt
Thiel Dr Rer Nat Max
Dr Phil Fritz Wiedemann
Voemel Dr Wolfgang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roche Diagnostics GmbH
Original Assignee
Boehringer Mannheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boehringer Mannheim GmbH filed Critical Boehringer Mannheim GmbH
Publication of DE1670139A1 publication Critical patent/DE1670139A1/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D471/00Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04Ortho-condensed systems

Landscapes

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

Description

Verfahren zur Herstellung von 3-(5-Nitrofuryl-2)-s-triazolo[4.3-a]pyridin-DerivatenProcess for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4.3-a] pyridine derivatives

Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung von s-Trlazolo[4.3-a]pyridin-Derivaten der allgemeinen Formel IThe present invention relates to a method of production of s-trlazolo [4.3-a] pyridine derivatives of the general Formula I.

(D,(D,

in der R Wasserstoff, ein Halogenatom, eine Alkyl-, Alkoxy-,in which R is hydrogen, a halogen atom, an alkyl, alkoxy,

ρ Nitro-,
Amino-, Acylamino-,/Carboxyl-, Carboxalkyl- oder
ρ nitro,
Amino, acylamino, / carboxyl, carboxalkyl or

Carboxamidogruppe bedeutet.Means carboxamido group.

Die Verbindungen sind neu und zeichnen sich durch ihre antimikrobielle Wirkung aus.The compounds are new and are characterized by their antimicrobial properties Effect.

Die Herstellung der neuen Nitrofurane erfolgt nach an sich bekannten Methoden durch Dehydrierung von 5-Nitrofurfurolpyridyl-(2)-hydrazonen der Formel IIThe production of the new nitrofurans takes place according to known methods Methods by dehydration of 5-nitrofurfurolpyridyl- (2) -hydrazones of formula II

(II),(II),

in der R die oben genannte Bedeutung hat, oderin which R has the meaning given above, or

0098U/18780098U / 1878

Dehydratisierung von 5-Nitrofuroyl-(2)-pyridyl-(2)-hydraziden der Formel IIIDehydration of 5-nitrofuroyl- (2) -pyridyl- (2) -hydrazides of formula III

(in),(in),

N'N '

in der R die oben genannte Bedeutung hat,in which R has the meaning given above,

oder Nitrierung von 3-[Furyl-(2)]-s-triazolo[4.;5-a]pyridin-Derivaten der Formel IVor nitration of 3- [furyl- (2)] - s-triazolo [4th; 5-a] pyridine derivatives of formula IV

in der R die oben genannte Bedeutung hat,in which R has the meaning given above,

worauf man für den Fall, daß R eine Aminogruppe bedeutet, gewünschtenfalls anschließend verseift.whereupon in the event that R is an amino group, saponified if desired.

Der Ringschluß durch Dehydrieren der Verbindungen II erfolgt vorzugsweise mit Oxydationsmitteln wie Bleitetraacetat (bzw. Mennige) in Eisessig oder Benzol oder Eisen-III-chlorid in Äthanol. Grundsätzlich koennen aber auch andere Oxydationsmittel eingesetzt werden.The ring closure by dehydrogenating the compounds II is preferably carried out with oxidizing agents such as lead tetraacetate (or red lead) in glacial acetic acid or benzene or ferric chloride in ethanol. Basically however, other oxidizing agents can also be used.

009844/187009844/187

Der Ringschluß durch Dehydratisieren der Verbindungen III erfolgt vorzugsweise durch Erhitzen mit einem wasserabspaltenden Mittel wie Phosphoroxychlorid, gegebenenfalls in einem inerten Loesungsmittel wie Benzol.The ring closure by dehydrating the compounds III is preferably carried out by heating with a dehydrating agent such as phosphorus oxychloride, optionally in an inert solvent like benzene.

Die nachträgliche Nitrierung erfolgt zweckmäßig in einem Loesungsmittel wie Acetanhydrid. Für den Fall, daß R eine Aminogruppe darstellt, wird diese unter den genannten Bedingungen acetyliert, damit aber auch gleichzeitig vor dem Angriff durch die Nitriersäure geschützt. Die Acetylgruppe kann dann anschließend ge-Viünschtenfalls durch Verseifen abgespalten werden.The subsequent nitration is expediently carried out in a solvent like acetic anhydride. In the event that R represents an amino group, this is acetylated under the conditions mentioned, but also at the same time before attack by the nitrating acid protected. The acetyl group can then be added if desired be split off by saponification.

Die als Ausgangsstoffe verwendeten Substanzen II werden durch Kondensation von 5-Nitrofurfurol mit 2-Hydrazino-pyridinen hergestellt. Die Substanzen III erhält man durch Umsetzung von 5-Nitrofuroylchlorid mit 2-Hydrazino-pyridinen, vorzugsweise in einem inerten Loesungsmittel (wie Benzol) bei erhoehter Temperatür.The substances II used as starting materials are produced by condensation of 5-nitrofurfurol with 2-hydrazino-pyridines. Substances III are obtained by reacting 5-nitrofuroyl chloride with 2-hydrazino-pyridines, preferably in an inert solvent (such as benzene) at an elevated temperature.

In den folgenden Beispielen ist das erfindungsgemäße Verfahren näher erläutert.The process according to the invention is explained in more detail in the following examples.

009844/1878009844/1878

BeispieleExamples

3-C 5-Nltrofuryl-(2)1-s-triazolo Γ 4.3-a]pyridin Variante_A£ 3-C 5-Nltrofuryl- (2) 1-s-triazolo Γ 4.3-a] pyridine variant_A £

9,28 g 5-Nitrofurfurol-pyridyl-(2)-hydrazon in 800 ml Eisessig werden unter Rühren mit 18,0 g Bleitetraacetat versetzt. Es wird 1 Stunde bei 55° weitergerührt, dann das Reaktionsgemisch im Vakuum zur Trockene gebracht. Der Rückstand wird mit Wasser angerieben und nach dem Absaugen nachgewaschen. Die Ausbeute beträgt 9,0 g 3-[5-Nitrofuryl-(2)]-s-triazolo[4.3-a]pyridin (97 % d.Th.), Pp. 266-270°. Durch Umkristallisieren aus Dioxan werden 4,98 g vom Fp. 275-277° erhalten.9.28 g of 5-nitrofurfurol-pyridyl- (2) -hydrazone in 800 ml of glacial acetic acid are mixed with 18.0 g of lead tetraacetate while stirring. The mixture is stirred for a further 1 hour at 55 °, then the reaction mixture is brought to dryness in vacuo. The residue is rubbed with water and washed after suction. The yield is 9.0 g of 3- [5-nitrofuryl- (2)] - s-triazolo [4.3-a] pyridine (97 % of theory), pp. 266-270 °. Recrystallization from dioxane gives 4.98 g of melting point 275-277 °.

In analoger Weise erhält man die folgenden in der Tabelle I zusammengestellten Verbindungen:The following compounds listed in Table I are obtained in an analogous manner:

00984 4/187800984 4/1878

Tabelle ITable I.

(D(D

R
6-CH3
R.
6-CH 3
Pp.
233°
Pp
233 °
Ausbeute
{% d.Th.)
65
yield
{% of theory)
65
7-CH5 7-CH 5 > 500°> 500 ° 4545 8-CH3 8-CH 3 248°248 ° 8080 5-Cl5-Cl 186-189°186-189 ° 9393 6-NO2 6-NO 2 294°294 ° 8585 8-NO2 8-NO 2 267°267 ° 9595 6-C00H6-C00H > 500°> 500 ° 7777

009844/1878009844/1878

Die als Ausgangsstoffe verwendeten Hydrazone II werden auf folgende Weise hergestellt:The hydrazones II used as starting materials are produced in the following way:

23,4- g 5-Nitrofurfurol in 200 ml Äthanol werden zur Loesung von I6,j5 g 2-Hydrazino-pyridin in 200 ml Äthanol gegeben. Das Produkt fällt sofort aus. Man erhält 25,0 g (67 % d.Th.) 5-Nitrofurfürol-pyridyl-(2)-hydrazon vom Pp. 209-211°(Zers.)j nach Umkristallisieren aus Dioxan schmilzt die Verbindung bei 211-212°(Zers.)·23.4 g of 5-nitrofurfurol in 200 ml of ethanol are added to dissolve 16.5 g of 2-hydrazino-pyridine in 200 ml of ethanol. The product fails immediately. 25.0 g (67 % of theory) of 5-nitrofurfürol-pyridyl- (2) -hydrazone of mp. 209-211 ° (decomp . ) Are obtained; after recrystallization from dioxane, the compound melts at 211-212 ° ( Decomp.)

w In analoger Weise erhält man die folgenden in Tabelle II zusammengestellten Ausgangsstoffe: w The following starting materials listed in Table II are obtained in an analogous manner:

0Q9844/187B0Q9844 / 187B

Tabelle IITable II

O NJl IL-CH=N-O NJl IL-CH = N-

^O^ O

(ID(ID

R
5-CH5
R.
5-CH 5
Fp.Fp. Ausbeute
{% d.Th.)
yield
{% of theory)
4-CH3 4-CH 3 108°(Zers.)108 ° (decomp.) 5555 3-CH3 3-CH 3 216°(Zers.)216 ° (decomp.) 7777 6-Cl6-Cl 192°(Zers.)192 ° (decomp.) 7575 5-NO2 5-NO 2 252°252 ° 6161 5-NO2 5-NO 2 227° *227 ° * 8585 5-COOH5-COOH 248°(Zers.)248 ° (decomp.) 8585 ab
299 (Zers.) **
away
299 (decomp.) **
8484

# kristallisiert aus DMP mit 1 Mol lCristall-DMF ** Herstellung in verd.. Essigsäure# Crystallized from DMP with 1 mol of crystal DMF ** Manufactured in dil. Acetic acid

009844/1878009844/1878

Variante_B£Variant_B £

1*16 s 5-Nitrofurfurol-pyridyl-(2)-hydrazon werden mit 2,7 g Eisen-Ill-chlorid-hexahydrat in 100 ml Äthanol 2 Std.1 * 16 s of 5-nitrofurfurol-pyridyl- (2) -hydrazone are mixed with 2.7 g of iron (III) chloride hexahydrate in 100 ml of ethanol for 2 hours.

am Rückfluß erhitzt. Das Reaktionsgemisch wird im Vakuum zur Trockene gebracht, der Rückstand mit Wasser versetzt. Es wird abgesaugt und aus Dioxan umkristallisiert. Die Ausbeute beträgt 0,26 g (23 ^ d.Th.) 3-[5-Nitrofuryl-(2)]-s-triazolo[4.3-a]pyridin, Pp. 274°.heated to reflux. The reaction mixture is brought to dryness in vacuo, and water is added to the residue. It will suctioned off and recrystallized from dioxane. The yield is 0.26 g (23 ^ of theory) 3- [5-nitrofuryl- (2)] - s-triazolo [4.3-a] pyridine, Pp. 274 °.

Variante _C:_Variant _C: _

1,0 g 5-Nitrofuroyl-(2)-pyridyl-(2)-hydrazid wird mit 10 ml Phosphoroxychlorid 2 1/2 Std. am Rückfluß erhitzt. Der nach dem Abziehen des überschüssigen Phosphoroxychlorids im Vakuum zurückbleibende Rückstand wird mit Natriumbicarbonat-Loesung in die Base übergeführt. Durch Umkristallisieren aus Dimethylformamid werden 0,1 g (11 % d.Th.) 3-[5-Nitrofuryl-(2)]-s-triazolo-[4.3-a]pyridin vom Fp. 275° erhalten.1.0 g of 5-nitrofuroyl- (2) -pyridyl- (2) hydrazide is refluxed with 10 ml of phosphorus oxychloride for 2 1/2 hours. The residue that remains after the excess phosphorus oxychloride has been stripped off in vacuo is converted into the base with sodium bicarbonate solution. Recrystallization from dimethylformamide gives 0.1 g (11 % of theory) of 3- [5-nitrofuryl- (2)] - s-triazolo- [4.3-a] pyridine with a melting point of 275 °.

Das als Ausgangssubstanz verwendete 5-Nitrqfuroyl-(2)-pyridyl-(2)-hydrazid wird wie folgt hergestellt:The 5-nitrqfuroyl- (2) -pyridyl- (2) hydrazide used as the starting substance is made as follows:

Zur Loesung von 10,9 g 2-Hydrazinopyridin in 30 ml trockenem Pyridin werden 17*5 g 5-Nitrofuroylchlorid geloest in 50 ml trockenem Pyridin bei Raumtemperatur unter Rühren eingetragen. Es wird auf 100° erhitzt und 15 Minuten bei dieser Temperatur weitergerührt. Das Loesungsmittel wird im Vakuum entfernt, der Rückstand mit Natriumbicarbonat-Loesung neutralisiert. Nach dem Absaugen wird reichlich mit Wasser nachgewaschen. Man erhält braune Kristalle, die bei 210° unter Zersetzung schmelzen.To dissolve 10.9 g of 2-hydrazinopyridine in 30 ml of dry Pyridine, 17 * 5 g of 5-nitrofuroyl chloride are dissolved in 50 ml added dry pyridine at room temperature with stirring. It is heated to 100 ° and 15 minutes at this temperature stirred further. The solvent is removed in vacuo and the residue is neutralized with sodium bicarbonate solution. After this Suction is abundantly washed with water. Brown crystals are obtained which melt at 210 ° with decomposition.

1*0 g 5-Nitrofuroyl-(2)-pyridyl-(2)-hydrazid werden mit 6 ml Acetanhydrid 3 Std. am Rückfluß erhitzt. Das Loesungsmittel1 * 0 g of 5-nitrofuroyl- (2) -pyridyl- (2) -hydrazide are mixed with 6 ml Acetic anhydride heated to reflux for 3 hours. The solvent

·/·
0098/^4/1878
· / ·
0098 / ^ 4/1878

wird im Vakuum entfernt, der Rückstand mit Äther angerieben. Man erhält 0,86 g (94 % d.Th.) rohes >[5-Nitrofuryl-(2)]-s-triazolo[4.j3-a]pyridin, Fp. 271°. Zur Analyse wird aus Dioxan umkristallisiert.is removed in vacuo, the residue rubbed with ether. 0.86 g (94 % of theory) of crude> [5-nitrofuryl- (2)] - s-triazolo [4.j3-a] pyridine, melting point 271 °, are obtained. For analysis, it is recrystallized from dioxane.

Variant e_Ej:Variant e_Ej:

Zur Loesung von 3,7 g 3-Furyl-(2)-s-triazolo[4.3-a]pyridin in 20 ml Acetanhydrid wird das Gemisch von 20 ml Acetanhydrid, 2,0 ml rauchender Salpetersäure und 1 Tropfen konz. Schwefelsäure bei -25° langsam eingetragen. Es wird 1 Stunde bei -25° weitergerührt, dann auf Eis gegossen. Nach der Zersetzung des Acetanhydridsneutralisiert man mit 2n Natronlauge, saugt ab und wäscht mit Wasser nach. Man erhält 0,7 g (15 % d.Th.) >[5-Nitrofuryl-(2)]-s-triazolo[4.>a]pyridin vom Fp. 274°. Zur Analyse wird aus Dioxan umkristallisiert.To dissolve 3.7 g of 3-furyl- (2) -s-triazolo [4.3-a] pyridine in 20 ml of acetic anhydride, the mixture of 20 ml of acetic anhydride, 2.0 ml of fuming nitric acid and 1 drop of conc. Sulfuric acid slowly entered at -25 °. The mixture is stirred for a further 1 hour at -25 °, then poured onto ice. After the decomposition of the acetic anhydride, it is neutralized with 2N sodium hydroxide solution, filtered off with suction and washed with water. 0.7 g (15 % of theory) of> [5-nitrofuryl- (2)] - s-triazolo [4.> a] pyridine with a melting point of 274 ° are obtained. For analysis, it is recrystallized from dioxane.

00 984 4/187800 984 4/1878

Claims (1)

PatentanspruchClaim Verfahren zur Herstellung s-Triazolo[4.3-a]pyridin-Derivaten der allgemeinen Formel IProcess for the preparation of s-triazolo [4.3-a] pyridine derivatives of the general formula I. (D,(D, in der R Wasserstoff, ein Halogenatom, eine Alkyl-, Alkoxy-,in which R is hydrogen, a halogen atom, an alkyl, alkoxy, ρ Nitro-,
Amino-, Acylamino-,/ Carboxyl-, Carboxalkyl- oder Carboxamido·
ρ nitro,
Amino, acylamino, / carboxyl, carboxalkyl or carboxamido
gruppe bedeutet,group means gekennzeichnet durch Dehydrierung von 5-Nitrofurfurol-pyridyl-(2)· hydrazonen der Formel IIcharacterized by dehydration of 5-nitrofurfurol-pyridyl- (2) · hydrazones of the formula II CH=N-HN-CH = N-HN- (II),(II), in der R die oben genannte Bedeutung hat, oderin which R has the meaning given above, or Dehydratisierung von 5-Nitrofuroyl-(2)-pyrldyl-(2)-hydraziden der Formel IIIDehydration of 5-nitrofuroyl- (2) -pyrldyl- (2) -hydrazides of the formula III 00984A/187800984A / 1878 • C-HN-HN• C-HN-HN (in),(in), in der R die oben genannte Bedeutung hat,in which R has the meaning given above, oder Nitrierung von 5-[Furyl-(2)]-s-triazolo[4.J-a]pyridin-Derivaten der Formel IVor nitration of 5- [furyl- (2)] - s-triazolo [4.J-a] pyridine derivatives of formula IV (IV)(IV) in der R die oben genannte Bedeutung hat,in which R has the meaning given above, worauf man für den Fall, daß R eine Aminogruppe bedeutet, gewünschtenfalls anschließend verseift,whereupon, if R is an amino group, then saponified if desired, 00984 4/187800984 4/1878
DE19661670139 1966-08-31 1966-08-31 Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4.3-a] pyridine derivatives Pending DE1670139A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEB0088700 1966-08-31
DEB0092146 1967-04-20

Publications (1)

Publication Number Publication Date
DE1670139A1 true DE1670139A1 (en) 1970-10-29

Family

ID=25968072

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19661670139 Pending DE1670139A1 (en) 1966-08-31 1966-08-31 Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4.3-a] pyridine derivatives
DE19671670212 Pending DE1670212A1 (en) 1966-08-31 1967-04-20 Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4,3-a] pyridine derivatives

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE19671670212 Pending DE1670212A1 (en) 1966-08-31 1967-04-20 Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4,3-a] pyridine derivatives

Country Status (6)

Country Link
AT (2) AT273113B (en)
CH (1) CH498860A (en)
DE (2) DE1670139A1 (en)
FR (1) FR1549295A (en)
GB (1) GB1131590A (en)
NL (1) NL6711894A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210648A1 (en) * 1985-08-01 1987-02-04 Merrell Dow Pharmaceuticals Inc. 5-chloro-s-triazolo/4,3-a/pyridine-7-carboxylic acids

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2657610A1 (en) * 1990-01-29 1991-08-02 Rhone Poulenc Agrochimie TRIAZOLOPYRIDINES HERBICIDES.
US20100035756A1 (en) * 2006-07-12 2010-02-11 Syngenta Limited Triazolophyridine derivatives as herbicides

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210648A1 (en) * 1985-08-01 1987-02-04 Merrell Dow Pharmaceuticals Inc. 5-chloro-s-triazolo/4,3-a/pyridine-7-carboxylic acids

Also Published As

Publication number Publication date
CH498860A (en) 1970-11-15
FR1549295A (en) 1968-12-13
GB1131590A (en) 1968-10-23
NL6711894A (en) 1968-03-01
AT273115B (en) 1969-08-11
DE1670212A1 (en) 1971-02-25
AT273113B (en) 1969-08-11

Similar Documents

Publication Publication Date Title
EP0039844A2 (en) Process for the preparation of O-substituted derivatives of (+)-cyanidan-3-ols
DE2655009A1 (en) ISOXAZOLE DERIVATIVES, THE PROCESS FOR THEIR MANUFACTURING AND MEANS CONTAINING THESE COMPOUNDS
CH439286A (en) Process for the preparation of new piperidine compounds
DE2530577A1 (en) NEW ORGANIC COMPOUNDS, THEIR PRODUCTION AND USE
DE1670139A1 (en) Process for the preparation of 3- (5-nitrofuryl-2) -s-triazolo [4.3-a] pyridine derivatives
DE1935404C3 (en) Process for the manufacture of quinazolines
CH620220A5 (en)
DE1470298A1 (en) Process for the preparation of 5-nitropyrrole compounds
DE1795231C3 (en) Process for the preparation of 5-aryl-1,2-dihydro -3H-1,4-benzodiazepin-2-one-4-oxides
EP0004322A1 (en) Isoquinolines, process for their preparation and their use for the preparation of medicines
AT273112B (en) Process for the preparation of new 3- [2- (5-nitrofuryl-2) vinyl] -s-triazolo [4,3-a] pyridine derivatives
DE1670140A1 (en) Process for the preparation of 3- [2- (5-nitrofuryl-2) vinyl] -s-triazolo [4,3-a] pyridine derivatives
CH432542A (en) Process for the preparation of new hydrazides
DE894693C (en) Process for the preparation of basic phenylhydrazones
AT204552B (en) Process for the preparation of new, heterocyclic bis-sulfonamides
AT296316B (en) Process for the preparation of new benzodiazepine derivatives and their N-4-oxides
DE2334973A1 (en) NEW BIPHENYL DERIVATIVES
Baker et al. BIOTIN. V. cis-3, 4-DIAMINOTHIOPHANE
DE806438C (en) Process for the production of novel pentaerythritol clusters
AT241452B (en) Process for the preparation of new 2-acyl derivatives of 5-amino-isoindoline
CH500966A (en) Diuretic and saluretic benzofuran - carboxylic acids
AT230371B (en) Process for the production of new indole derivatives
DE1049384B (en) Process for the preparation of a therapeutically active aminobenzenesulfonamide and its salts
AT234679B (en) Process for the preparation of new amino-pyrazole derivatives
AT216152B (en) Process for the preparation of diesters of deserpidic acid and its salts