WO1998045261A1 - Process for producing 5-methylindolines - Google Patents
Process for producing 5-methylindolines Download PDFInfo
- Publication number
- WO1998045261A1 WO1998045261A1 PCT/JP1998/001557 JP9801557W WO9845261A1 WO 1998045261 A1 WO1998045261 A1 WO 1998045261A1 JP 9801557 W JP9801557 W JP 9801557W WO 9845261 A1 WO9845261 A1 WO 9845261A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- benzyl
- reaction
- hydrogen
- group
- lower alkyl
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
- C07D209/04—Indoles; Hydrogenated indoles
- C07D209/08—Indoles; Hydrogenated indoles with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to carbon atoms of the hetero ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
- C07D209/04—Indoles; Hydrogenated indoles
- C07D209/10—Indoles; Hydrogenated indoles with substituted hydrocarbon radicals attached to carbon atoms of the hetero ring
Definitions
- the present invention relates to the production of 5-methylindolines which are extremely useful as intermediates between medicine and pesticides.
- An object of the present invention is to provide a novel method for industrially producing 5-methylindolines easily from raw materials that are easily available industrially.
- the present invention relates to the general formula
- R1 represents a hydrogen atom or a lower alkyl group
- R 2 represents a hydrogen atom
- lower alkyl indicates a group or a lower alkoxy group.
- 1- (substituted) benzyl-5-formyl Indorin acids which is characterized by catalytic hydrogenation in the presence of an inert solvent and a palladium catalyst.
- R1 represents a hydrogen atom or a lower alkyl group.
- the process of the present invention is characterized by catalytically hydrogenating 1- (substituted) benzyl-5-formylindolines (formula 3), which is industrially easily available as a raw material, in the presence of an inert solvent and a palladium catalyst. , A novel method for producing 5-methylindolines.
- R 1 in the formula [Chemical Formula 3] is a hydrogen atom or a lower alkyl having 1 to 6 carbon atoms.
- R 2 is a hydrogen atom; carbon number of 1 to 6 Lower alkyl groups, specifically methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, pentyl, hexyl, etc.; or lower alkoxy having 1 to 6 carbon atoms 1- (substituted) benzyl-5-formyl group, specifically, methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, pentyloxy group, hexyloxy group, etc.
- benzyl-5-formylindolins having R 2 include 1-benzyl-5-formylindoline, 1-benzyl-2-methyl-5-formylindoline, 1 - (4 - main Tokishibenjiru)? force may be mentioned 2-main Senru 5- formyl indoline like, the raw material in the method of the present invention is not intended to be limited to these exemplified compounds.
- any palladium catalyst generally used for catalytic hydrogenation may be used.
- palladium may be used alone, or a simple substance or hydroxide of palladium may be used as activated carbon, alumina, or charcoal. It may be supported on a solid carrier such as calcium acid, silica, diatomaceous earth, or barium sulfate.
- a solid carrier such as calcium acid, silica, diatomaceous earth, or barium sulfate.
- the ratio of palladium supported on the carrier at this time, and the ratio may be appropriately determined in consideration of reaction conditions and economics.
- a commercially available catalyst in which palladium is supported on activated carbon at various supported ratios may be used. Hydrogenation catalysts can be used.
- the force loading of commercially available palladium generally is 2 ⁇ 10% f, in the loading ratio of a palladium catalyst used in the present invention as described above restrictions have greens.
- One or more palladium catalysts can be used in combination.
- Palladium ⁇ The uncatalyzed (also was supported on active carbon palladium) Specific examples T / C, Pd / Al 2 0 3 (which palladium was supported on alumina), Pd (OH) 2 / C (which hydroxide palladium was supported on active carbon), Pd / CAC0 3 (Bruno, 'radium those were supported on calcium carbonate) and the like.
- the use of Pd / C is particularly advantageous from an industrial point of view.
- the amount of palladium catalyst used is based on 1- (substituted) benzyl-5-formylindolines [Chemical Formula 3], taking the use of 5% (indicating the amount of supported palladium) -Pd / C as an example. Is 0.1 to 40% by weight, preferably 5 to 30% by weight as a palladium catalyst.
- a solvent generally used for catalytic hydrogenation can be used.
- alcohols specifically, for example methanol, ethanol, n- propanol, isopropanol, n _ butanol, ethylene glycol, propylene glycol, 2-main butoxy ethanol, 2-E preparative butoxyethanol and the like
- aromatic hydrocarbons Specifically, for example, toluene, benzene, xylene and the like
- aliphatic esters specifically, for example, methyl acetate, ethyl acetate, butyl acetate and the like
- polar solvents specifically, for example, ether solvents such as dioxane, N, N-dimethylformamide (DMF), N, N-getylformamide, 1,3-dimethyl-2-imidazolidinone (DMI), 1-methyl-2-pyrrolidone, 1,3-dimethyl- 3,4,5,6-tetrahydr
- lower aliphatic alcohols such as methanol, ethanol, n- propanol and isopropanol.
- Inert solvent May be used alone or in combination of two or more. It is also possible to add 1 to 20% by volume of acetic acid or the like to an inert solvent other than acetic acid. The amount of inert solvent, the force is not constant depending on the type of 5-formyl-indoline compounds [Formula 3]? May be any agitation amounts above. Usually, 5-formylindolines
- 0.1 to 21, preferably 0.5 to 11 can be used.
- hydrogen is not particularly limited, and hydrogen that is industrially easily available can be used as it is. Those forces are commercially available are filled in a bomb? Ri easy der available, there is economical as well.
- the method of introducing hydrogen and the method of reaction are not particularly limited, and may be carried out at normal pressure or under pressure according to a general method of catalytic hydrogenation. When a pressurized reaction vessel is used, it may be used as long as it is so named, but an autoclave is generally used.
- the hydrogen pressure at the time of starting the reaction is as follows.
- the pressure may be in the range of 50 kg / cm 2 , preferably from normal pressure to 10 kg / cm 2.
- the reaction temperature can be arbitrarily selected within a temperature range not higher than the boiling point of the solvent, but is preferably from 0 to 150 * 0, more preferably from 50 to 100.
- the reaction time varies depending on various conditions such as the method of introducing hydrogen, the activity of the catalyst, the initial pressure of hydrogen, and the like, and cannot be unconditionally determined. In general, the higher the initial hydrogen pressure, the shorter the reaction time. Actually, the end point may be the time when the absorption of hydrogen is stopped.
- the 5-methylindolines [Chemical Formula 4] produced in this reaction are removed according to the inert solvent used in the reaction, for example, by distilling the residue obtained by concentrating the solvent from the reaction solution. be able to.
- the 1- (substituted) benzyl-5-formylindrins [Chemical Formula 3] used as a raw material in the method of the present invention can be prepared by using an indoline as a raw material and a journal of organic chemicals as shown in the following Scheme [Chemical Formula 5]. Toriichi (J.Org.Chem.), Vol. 33
- R1 represents a hydrogen atom or a lower alkyl group
- R 2 represents a hydrogen atom, lower alkyl group or a lower alkoxy group.
- 1- (substituted) benzyl-5-formylindrins which can be easily produced industrially in only two steps from (substituted) indrins and are easily available are used as raw materials,
- a novel method for producing 5-methylindolines by catalytic hydrogenation in the presence of a solvent and a palladium catalyst is provided.
- the reduction reaction of the formyl group at the 5-position of the indoline skeleton to the methyl group and the elimination reaction of the benzyl moiety at the 1-position can be carried out simultaneously in the same reactor. It also has the advantage that the desired product can be obtained in good yield even under conditions such as atmospheric pressure reaction where the pressure in the system is low.
- the method of the present invention is superior in operability and simpler than the conventional method, is advantageous in terms of energy and cost, and is suitable for implementation on an industrial scale. high.
- reaction solution was cooled to room temperature, opened after leaking hydrogen, filtered with a palladium catalyst (10% -Pd / C), and ethanol was distilled off under reduced pressure to obtain a colorless liquid as a residue. Vacuum distillation of the obtained liquid, boiling point
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Indole Compounds (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98911205A EP0976731B1 (en) | 1997-04-07 | 1998-04-03 | Process for producing 5-methylindolines |
| US09/402,456 US6066744A (en) | 1997-04-07 | 1998-04-03 | Process for producing 5-methylindolines |
| DE69808269T DE69808269T2 (de) | 1997-04-07 | 1998-04-03 | Verfahren zur herstellung von 5-methylindolinen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10383897A JP3968731B2 (ja) | 1997-04-07 | 1997-04-07 | 5−メチルインドリン類の製造法 |
| JP9/103838 | 1997-04-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998045261A1 true WO1998045261A1 (en) | 1998-10-15 |
Family
ID=14364574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1998/001557 Ceased WO1998045261A1 (en) | 1997-04-07 | 1998-04-03 | Process for producing 5-methylindolines |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6066744A (ja) |
| EP (1) | EP0976731B1 (ja) |
| JP (1) | JP3968731B2 (ja) |
| DE (1) | DE69808269T2 (ja) |
| WO (1) | WO1998045261A1 (ja) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5398961A (en) * | 1977-02-04 | 1978-08-29 | Ihara Chem Ind Co Ltd | Preparation of indolines |
| JPS5965072A (ja) * | 1982-10-07 | 1984-04-13 | Nippon Kayaku Co Ltd | インドリンまたはインドリン誘導体の製造方法 |
| JPS63297363A (ja) * | 1987-05-28 | 1988-12-05 | Nippon Steel Chem Co Ltd | 3−メチルインド−ル類の製造法 |
| JPH08225524A (ja) * | 1994-10-27 | 1996-09-03 | L'oreal Sa | N基が保護されたインドリンからのインドール化合物の調製方法 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2825347C2 (de) * | 1978-06-09 | 1986-07-17 | Dynamit Nobel Ag, 5210 Troisdorf | Verfahren zur Herstellung von p-Hydroxymethylbenzoesäurealkylestern |
-
1997
- 1997-04-07 JP JP10383897A patent/JP3968731B2/ja not_active Expired - Fee Related
-
1998
- 1998-04-03 WO PCT/JP1998/001557 patent/WO1998045261A1/ja not_active Ceased
- 1998-04-03 EP EP98911205A patent/EP0976731B1/en not_active Expired - Lifetime
- 1998-04-03 US US09/402,456 patent/US6066744A/en not_active Expired - Fee Related
- 1998-04-03 DE DE69808269T patent/DE69808269T2/de not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5398961A (en) * | 1977-02-04 | 1978-08-29 | Ihara Chem Ind Co Ltd | Preparation of indolines |
| JPS5965072A (ja) * | 1982-10-07 | 1984-04-13 | Nippon Kayaku Co Ltd | インドリンまたはインドリン誘導体の製造方法 |
| JPS63297363A (ja) * | 1987-05-28 | 1988-12-05 | Nippon Steel Chem Co Ltd | 3−メチルインド−ル類の製造法 |
| JPH08225524A (ja) * | 1994-10-27 | 1996-09-03 | L'oreal Sa | N基が保護されたインドリンからのインドール化合物の調製方法 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0976731A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10279557A (ja) | 1998-10-20 |
| DE69808269D1 (de) | 2002-10-31 |
| DE69808269T2 (de) | 2003-05-15 |
| EP0976731A4 (en) | 2000-05-24 |
| EP0976731A1 (en) | 2000-02-02 |
| US6066744A (en) | 2000-05-23 |
| JP3968731B2 (ja) | 2007-08-29 |
| EP0976731B1 (en) | 2002-09-25 |
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