WO1995034551A1 - Method of preparing benzothiophene derivatives - Google Patents
Method of preparing benzothiophene derivatives Download PDFInfo
- Publication number
- WO1995034551A1 WO1995034551A1 PCT/EP1995/002140 EP9502140W WO9534551A1 WO 1995034551 A1 WO1995034551 A1 WO 1995034551A1 EP 9502140 W EP9502140 W EP 9502140W WO 9534551 A1 WO9534551 A1 WO 9534551A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- formula
- thionyl chloride
- acid
- reaction
- mol
- Prior art date
Links
- 0 *c1c(*)c(*)c(*)c2c1C=C(C(N*)=O)S2(=O)=O Chemical compound *c1c(*)c(*)c(*)c2c1C=C(C(N*)=O)S2(=O)=O 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
- C07D333/50—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
- C07D333/52—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes
- C07D333/62—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes 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 carbon atoms of the hetero ring
- C07D333/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
- C07D333/70—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen attached in position 2
Definitions
- the application relates to a process for the preparation of specially substituted benzthiophene derivatives of the general formula (I)
- R 1 NH-C r C 20 alkyl, H-aryl, NH-benzyl and
- R 2 represents H, methyl or halogen.
- the benzothiophene derivatives of the formula (I) are known and are used as intermediates for the preparation of known pharmaceuticals, crop protection agents and material protection agents.
- Alkyl here and in the following preferably represents straight-chain, branched or cyclic alkyl, which is optionally interrupted by one or two oxygen atoms, for example methyl, ethyl, n-, i-propyl, n-, i-, s-, t- Butyl, n-, i-, s-, t- pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl or their various branched structural isomers and for cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl.
- the thionyl chloride is generally used in excess, preferably from 3 to 10 equivalents, very particularly preferably from 3 to 6 equivalents.
- the reaction temperatures can vary over a wide range.
- the reaction is preferably carried out at temperatures from 0 ° C. to 200 ° C., very particularly preferably from 70 ° C. to 160 ° C., but temperatures of 0 ° C. to 70 ° C. before starting to meter in either the cinnamic acids or the thionyl chloride ⁇ be held.
- Bases can optionally also be added in this reaction, bases such as pyridine, triethylamine, quinoline,
- reaction can also be carried out without a diluent
- diluents In the presence of diluents. It is preferred to work without diluents or with diluents such as carbon Hydrogen such as benzene, toluene or hexane, halogenated hydrocarbons such as carbon tetrachloride, chloroform, methylene chloride, ethers such as diethyl ether, dipropyl ether, dibutyl ether, methyl tert-butyl ether, dioxane, tetrahydrofuran, also dimethylformamide, acetonitrile or DMSO or mixtures of these Solvents.
- carbon Hydrogen such as benzene, toluene or hexane
- halogenated hydrocarbons such as carbon tetrachloride, chloroform, methylene chloride
- ethers such as diethyl ether, dipropyl ether, dibutyl ether, methyl tert-but
- any thionyl chloride which may still be present is optionally either added to a "tug" and distilled off one or more times or the excess thionyl chloride is removed in vacuo.
- Suitable solvents are all solvents that are capable of entraining thionyl chloride during distillation.
- High-boiling organic solvents are preferably used for this, very particularly preferably hydrocarbons such as benzene, toluene, xylene, chlorobenzene, hexane, heptane, octane, chloroform, hydrocarbon tetrachloride, ethers such as dibutyl ether, methyl tert-butyl ether and nitromethane, dimethylformamide or DMSO.
- the intermediate stage of the 3-chloro-benzthiophene-2-carboxamides of the formula (V) is obtained if the 3-chloro-benzthiophene-2-carboxylic acid amides prepared above are optionally in the presence of an acid binder and if appropriate in the presence of a diluent with amines R. 1 -NH 2 of formula (IV) converts.
- the reaction temperatures can be varied over a wide temperature range. In general, temperatures from -10 ° C to + 100 ° C, preferably from 0 ° C to 60 ° C.
- the amount of amine added and any amount of acid binder added is approximately equimolar to the 3-chlorobenzothiophene-2 present. amount of carboxylic acid chloride. An excess of amine and acid binders generally does no harm.
- acid-binding agents can be used as acid-binding agents. These preferably include tertiary amines such as triethylamine and pyridine; Alkali hydroxides such as sodium and potassium hydroxide; Alkali carbonates and hydrogen carbonates such as potassium carbonate and sodium hydrogen carbonate, as well as the amines of the general formula (IV) itself.
- tertiary amines such as triethylamine and pyridine
- Alkali hydroxides such as sodium and potassium hydroxide
- Alkali carbonates and hydrogen carbonates such as potassium carbonate and sodium hydrogen carbonate, as well as the amines of the general formula (IV) itself.
- Suitable solvents are all solvents which do not themselves react with the 3-chlorobenzothiophene-2-carboxylic acid, preferably hydrocarbons such as benzene, toluene or hexane, halogenated hydrocarbons such as carbon tetrachloride, chloroform, methylene chloride, ethers such as diethyl ether, dipropyl ether, dibutyl ether , Methyl tert-butyl ether, dioxane, tetrahydrofuran, and also ethyl acetate, dimethylformamide, acetonitrile or DMSO.
- hydrocarbons such as benzene, toluene or hexane
- halogenated hydrocarbons such as carbon tetrachloride, chloroform, methylene chloride
- ethers such as diethyl ether, dipropyl ether, dibutyl ether , Methyl
- reaction mixture obtained in this way is then dissolved in hydrogen in the presence of catalysts, if appropriate after changing the diluent and, if appropriate, after stirring beforehand with water
- Temperature to work are between 50 ° C. and 200 ° C., temperatures between 70 ° C. and 150 ° C. are particularly advantageous, temperatures between 80 ° C. and 120 ° C. are very particularly advantageous. In general, one works under increased pressure between 5 and 300 bar, a pressure between 50 and 200 bar is particularly advantageous, very particularly advantageously between 80 and 120 bar.
- Suitable solvents are all solvents which have a sufficient solubility for hydrogen and the 3-chlorobenzthiophene-2-carboxamides, such as, for example, alcohols, ethers, aromatics, pyrrole- done.
- Suitable alcohols are straight-chain or branched, primary, secondary or tertiary alcohols up to C 10 .
- Particularly suitable alcohols are, for example, methanol, ethanol, propanol, isopropanol, n-butanol, isobutanols and n- and isopentanols, and mixtures thereof.
- Methanol, ethanol, n-propanol and iso-propanol are very particularly suitable.
- Suitable ethers have been found to be symmetrical and unsymmetrical alkyl-alkyl and alkyl-aryl ethers up to C 10 .
- Particularly suitable ethers are dimethyl ether, diethyl ether, diisopropyl ether, methyl tert-butyl ether, tetrahydrofuran or dioxane.
- Suitable aromatics have been found to be benzene, toluene and xylenes.
- Suitable pyrrolidones are, for example, N-methylpyrrolidone, N-octylpyrrolidone.
- the hydrodechlorination is optionally carried out by adding an HCl scavenger which binds or complexes the HC1 formed.
- HC1 scavengers capable of HCl binding or HCl complexation can be used here.
- Particularly suitable bases in the context of the invention are NaOH, KOH, Ca (OH) 2 , Ba (OH) 2 and pyridine.
- the catalyst and inorganic substances are filtered off and the filtrate is purified in the customary manner by distillation, chromatography or crystallization.
- Suitable oxidizing agents for carrying out the process according to the invention are all oxidizing agents which can normally be used for sulfur oxidations. Hydrogen peroxide or organic is preferably used
- Peracids such as peracetic acid, 4-nitroperbenzoic acid or 3-chloroperbenzoic acid, or also inorganic oxidizing agents, such as periodic acid, potassium permanganate, chromic acid or oxones.
- Suitable diluents for carrying out the process according to the invention are inorganic or organic solvents, depending on the oxidizing agent used.
- Alcohols such as, for example, methanol, ethanol, propanol, isopropanol or mixtures thereof with water or pure water are preferably used;
- Acids such as, for example, acetic acid, acetic anhydride or propionic acid, or dipolar aprotic solvents, such as acetonitrile, acetone,
- halogenated hydrocarbons such as gasoline, benzene, toluene, hexane, cyclohexane, petroleum ether, dichloromethane, dichloroethane, chloroform, carbon tetrachloride or chlorobenzene.
- the process according to the invention can optionally be carried out in the presence of a reaction auxiliary.
- All organic or inorganic acid binders which can be used conventionally are suitable as such.
- Alkaline earth metal or alkali metal hydroxides, acetates or carbonates, such as, for example, calcium hydroxide, sodium hydroxide, are preferably used.
- the process according to the invention can also be carried out in the presence of a suitable catalyst.
- a suitable catalyst there are all catalysts which can usually be used for such sulfur oxidations question.
- Heavy metal catalysts are preferably used; ammonium molybdate is mentioned as an example in this context.
- reaction temperatures can be varied within a substantial range when carrying out the process according to the invention. In general, temperatures from -30 ° C to + 200 ° C, preferably at temperatures from 0 ° C to + 140 ° C.
- reaction products are worked up and isolated by known processes.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU26745/95A AU2674595A (en) | 1994-06-16 | 1995-06-06 | Method of preparing benzothiophene derivatives |
JP8501572A JPH10501543A (en) | 1994-06-16 | 1995-06-06 | Method for producing benzothiophene derivative |
EP95921831A EP0765317A1 (en) | 1994-06-16 | 1995-06-06 | Method of preparing benzothiophene derivatives |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4420926.6 | 1994-06-16 | ||
DE19944420926 DE4420926A1 (en) | 1994-06-16 | 1994-06-16 | Process for the preparation of benzthiophene derivatives |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995034551A1 true WO1995034551A1 (en) | 1995-12-21 |
Family
ID=6520657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/002140 WO1995034551A1 (en) | 1994-06-16 | 1995-06-06 | Method of preparing benzothiophene derivatives |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0765317A1 (en) |
JP (1) | JPH10501543A (en) |
AU (1) | AU2674595A (en) |
DE (1) | DE4420926A1 (en) |
WO (1) | WO1995034551A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0512349A1 (en) * | 1991-05-09 | 1992-11-11 | Bayer Ag | Benzothiophene-2-carboxamide-S,S-dioxides |
DE4317076A1 (en) * | 1993-05-21 | 1994-11-24 | Bayer Ag | Benzothiophene carboxamide S-oxide |
-
1994
- 1994-06-16 DE DE19944420926 patent/DE4420926A1/en not_active Withdrawn
-
1995
- 1995-06-06 WO PCT/EP1995/002140 patent/WO1995034551A1/en not_active Application Discontinuation
- 1995-06-06 EP EP95921831A patent/EP0765317A1/en not_active Withdrawn
- 1995-06-06 AU AU26745/95A patent/AU2674595A/en not_active Abandoned
- 1995-06-06 JP JP8501572A patent/JPH10501543A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0512349A1 (en) * | 1991-05-09 | 1992-11-11 | Bayer Ag | Benzothiophene-2-carboxamide-S,S-dioxides |
DE4317076A1 (en) * | 1993-05-21 | 1994-11-24 | Bayer Ag | Benzothiophene carboxamide S-oxide |
WO1994027986A1 (en) * | 1993-05-21 | 1994-12-08 | Bayer Aktiengesellschaft | Carboxylic acid amide benzothiophene-s-oxides |
Non-Patent Citations (1)
Title |
---|
W.B. WRIGHT ET AL.: "The Preparation of 3-Chlorobenzo[b]thiophene Derivatives from Cinnamic Acids", JOURNAL OF HETEROCYCLIC CHEMISTRY, vol. 8, no. 5, PROVO US, pages 711 - 714 * |
Also Published As
Publication number | Publication date |
---|---|
DE4420926A1 (en) | 1995-12-21 |
JPH10501543A (en) | 1998-02-10 |
EP0765317A1 (en) | 1997-04-02 |
AU2674595A (en) | 1996-01-05 |
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