WO2005019159A1 - 光学活性α−アミノオキシケトン誘導体及びその製造方法 - Google Patents
光学活性α−アミノオキシケトン誘導体及びその製造方法 Download PDFInfo
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- WO2005019159A1 WO2005019159A1 PCT/JP2004/012008 JP2004012008W WO2005019159A1 WO 2005019159 A1 WO2005019159 A1 WO 2005019159A1 JP 2004012008 W JP2004012008 W JP 2004012008W WO 2005019159 A1 WO2005019159 A1 WO 2005019159A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
- C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
- C07D317/72—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 spiro-condensed with carbocyclic rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C239/00—Compounds containing nitrogen-to-halogen bonds; Hydroxylamino compounds or ethers or esters thereof
- C07C239/08—Hydroxylamino compounds or their ethers or esters
- C07C239/20—Hydroxylamino compounds or their ethers or esters having oxygen atoms of hydroxylamino groups etherified
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
- C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D211/68—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D211/72—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D211/74—Oxygen atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/16—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
- C07D309/28—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member 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
- C07D309/30—Oxygen atoms, e.g. delta-lactones
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
- C07D319/04—1,3-Dioxanes; Hydrogenated 1,3-dioxanes
- C07D319/08—1,3-Dioxanes; Hydrogenated 1,3-dioxanes condensed with carbocyclic rings or ring systems
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D335/00—Heterocyclic compounds containing six-membered rings having one sulfur atom as the only ring hetero atom
- C07D335/02—Heterocyclic compounds containing six-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D339/00—Heterocyclic compounds containing rings having two sulfur atoms as the only ring hetero atoms
- C07D339/08—Six-membered rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
- C07F7/1872—Preparation; Treatments not provided for in C07F7/20
- C07F7/1892—Preparation; Treatments not provided for in C07F7/20 by reactions not provided for in C07F7/1876 - C07F7/1888
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B2200/00—Indexing scheme relating to specific properties of organic compounds
- C07B2200/07—Optical isomers
Definitions
- the present invention relates to a para-aminooxyketone derivative which can be easily converted to a para-hydroxyketone useful for pharmaceuticals, agricultural chemicals, and the like, and a production method for obtaining the same with a high yield and a high enantioselectivity.
- Non-Patent Document 1 ⁇ -hydroxyketone has been synthesized by diastereoselective reaction or enantioselective reaction after once converting ketone to a corresponding enolate or its equivalent (see Non-Patent Document 1). .
- Examples of such a method include a method in which a ketone is introduced into a lithium enolate and then an optically active oxaziridine is allowed to act as an oxidizing agent (see Patent Documents 2 to 8).
- a method of performing asymmetric dihydroxylation after conversion to a noreether see Non-Patent Documents 9 to 10) and a method of performing asymmetric epoxidation (Non-Patent Documents 10 to 14) are known.
- Patent Document 15 Recently, a method for synthesizing monoaminooxyketones by asymmetric catalysis using nitrosobenzene using a catalytic amount of an optically active activator after converting ketones to tin enolates has been reported ( Patent Document 15).
- Non-patent document 13 Ju et al. (Zhu, Y .; Yu, Y .; Yu, H .; Shi, Y. Tetrahedron Lett. 1998, 39, 7819)
- Non-patent document 14 Adam et al.
- Non-Patent Document 15 Momiyama et al. (
- an object of the present invention is to provide a method for industrially advantageously producing an optically active ⁇ -aminooxy ketone from a ketone which does not have the above-mentioned problems, and to thereby efficiently obtain a hydroxy-ketone.
- the present invention provides the following method.
- a ketone represented by the following general formula (2) is reacted with a nitroso compound represented by the general formula (3) in the presence of a proline or a proline derivative represented by the general formula (4).
- R 1 and R 2 represent an alkyl, alkenyl or alkynyl group which may have a substituent, and R 1 and R 2 are taken together to form a ring Is also good.
- R 3 represents an aryl, heterocyclic, alkyl, alkenyl or alkynyl group which may have a substituent.
- A represents a hydrogen atom, an alkoxy group, an aryloxy group, an asinoleoxy group, or a silyloxy group which may have a substituent.
- a ketone represented by the following general formula (2) is reacted with a nitroso compound represented by the general formula (3) in the presence of a proline or a proline derivative represented by the general formula (4 ′)
- a method for producing an optically active aminoaminoketone derivative represented by the general formula (1 ′) characterized in that:
- R 1 and R 2 represent an alkyl, alkenyl or alkynyl group which may have a substituent, and R 1 and R 2 are taken together to form a ring I'm sorry.
- R 3 represents an aryl, heterocyclic, alkyl, alkenyl or alkynyl group which may have a substituent.
- A represents a hydrogen atom, an alkoxy group, an aryloxy group, an asinoleoxy group, or a silyloxy group which may have a substituent.
- one X—Y—Z— represents one selected from the following groups.
- high aminonanketone can be selectively obtained with high yield and high technical efficiency.
- proline When the catalyst is proline, proline has the feature of being inexpensive. Further, when the catalyst used is a proline derivative, particularly superproline described later, it is necessary to produce the corresponding aminoaminoketone in a short time with a high yield and high enantioselectivity as compared with proline. Can be.
- the method for producing an ⁇ -aminooxy ketone of the present invention is characterized in that the ketone represented by the general formula (2) is replaced by the nitroso compound represented by the general formula (3), ') Is characterized by reacting in the presence of a proline derivative.
- the alkyl group represented by R 1 and R 2 preferably has 20 carbon atoms, particularly preferably about 115 carbon atoms. Specifically, for example, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, t_butyl, pentyl, hexyl, heptyl, n-octyl, 2-ethylhexyl group, tert-octyl group, nonyl group, decyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, n-hexadecinole group, 2-hexynoledecinole group, heptadecinole group, octadecinole group, nonadecinole group And an icosyl group.
- the alkyl group may further have a substituent. Examples of such a substituent include the following ary
- examples of the aryl group include a phenyl and naphthyl group which may have a substituent.
- the heterocycle of the heterocyclic group includes piperidine, furan, thiophene, pyrrole, virazole, imidazole, triazole, oxazole, isoxazole, thiazole, isothiazonole, dioxolan, pyridine, pyrimidine, pyrazine, triazine, dioxane, dithiane. , Monorephorin, azepine, oxepin, chepin and the like.
- the aryl group and the heterocyclic group may further have a substituent.
- substituents include an alkyl group, an alkenyl group, a nitro group, and a halogen atom (for example, a fluorine atom, a chlorine atom, Bromine atom, iodine atom) and the like.
- the alkenyl group represented by R 1 and R 2 preferably has 2 to 20 carbon atoms, particularly preferably about 2 to 5 carbon atoms.
- the alkenyl group include a propyl group such as a vinyl group and an aryl group, a butyryl group, a pentenyl group, a hexenyl group, a heptyl group, an otatyl group, a nonenole group, a decenyl group, a decenyl group, and a dodecenyl group.
- the alkenyl group may further have a substituent. Examples of such a substituent include the above-mentioned aryl group and heterocyclic group.
- the alkynyl group preferably has 2 to 20 carbon atoms, particularly preferably 2 to 5 carbon atoms.
- R 1 and R 2 may be combined to form a ring.
- a ring examples include cyclohexane, cyclopentane, cycloheptane, cyclooctane, cyclononane, tetrahydrofuran, tetrahydropyran, piperidine, pyrrolidine, thiacyclohexane, and the like.
- These rings may further have a substituent. Examples of such a substituent include the above-mentioned alkyl group, alkenyl group, alkynyl group, aryl group, and heterocyclic group.
- ketone represented by the general formula (2) include cyclohexanone, cyclopentanone, dimethylcyclohexanone, 1,4-cyclohexanedione monoethylene ketal, tetrahydropyran-4-one, Piberidinone, 3_pentanone, tetrahydrothiopyran-4-one, 3,3-dimethylcyclohexanone, cis-3,5-dimethylcyclohexanone, 3-methylcyclohexanone, 3-phenylcyclohexanone, 4-tert -Butylcyclohexanone, 4_ (tert-butyldiphenylsiloxy) cyclohexanone, cycloheptanone, 2-butanone, 1,5-dioxaspiro [5.5] pendency-9-one, 1,5-dithiaspiro [5.5] And penta-9-one, 4,4-dimethoxycyclohexanone
- aryl group represented by R 3 a phenyl group which may have a substituent, a naphthyl group and the like are preferable.
- examples of the hetero ring of the heterocyclic group represented by R 3 include piperidine, furan, thiophene, pyrrole, pyrazole, imidazole, triazole, oxazole, isooxazole, thiazole, isothiazole, and dioxolane.
- the aryl group and the heterocyclic group may further have a substituent.
- substituents include an alkyl group, an alkenyl group, a nitro group, and a halogen atom (for example, a fluorine atom, a chlorine atom, Bromine atom, iodine atom) and the like.
- the alkyl group represented by R 3 preferably has 20 carbon atoms. Those having about 115 carbon atoms are preferred. Specifically, for example, methyl, ethyl, propynole, isopropyl, n-butyl, sec-butyl, t-butyl, pentyl, hexyl, heptyl, n-octyl, 2-ethylhexyl, tert-octyl, nonyl, decyl, dodecinole, tridecinole, tetradecinole, pentadecyl, n-hexadecyl, 2_hexynoledecinole, heptadecinole, octadecyl, nonadecyl And an icosyl group.
- the alkyl group may further have a substituent. Examples of such a substituent include the above aryl group and heterocyclic group.
- the alkenyl group represented by R 3 preferably has 2 to 20 carbon atoms, and particularly preferably has about 25 carbon atoms.
- the alkenyl group include a propyl group such as a butyl group and an aryl group, a butyryl group, a pentenyl group, a hexenyl group, a heptyl group, an otathyl group, a nonenyl group, a decenyl group, a pendecenyl group, a dodecenyl group and a tridecenyl group.
- alkenyl group may further have a substituent.
- substituents include the above-mentioned aryl group and heterocyclic group.
- the alkynyl group represented by R 3 is preferably a group having 2-20 carbon atoms, particularly preferably a group having 2-5 carbon atoms.
- nitrosobenzene is preferable.
- proline or a proline derivative represented by the general formula (4) or (4 ′) is used as the asymmetric catalyst.
- A represents a hydrogen atom, an alkoxy group, an aryloxy group, an alkoxy group, or a silyloxy group which may have a substituent.
- alkoxy group include those having 115 carbon atoms, such as a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a pentyloxy group.
- aryloxy group include a phenyloxy group, a naphthyloxy group, and the like.
- the asinoleoxy group include an acetoxy group and a benzoyloxy group.
- Examples of the substituent of the silyloxy group include an alkyl group, an aryl group, and an alkenyl group.
- A is a methoxy group, see Rhoda et al. Roda, Aldo; Cerre, Carolina; Marietta, Anna C; Cainelli, Gianfranco; Ronchi, Achille Umani; Panunzio, Mauro. Journal of Medicinal Chemistry (1996), 39 (11), 2270-6.)
- Is a benzoyloxy group see Perni, Robert et .; Britt, Shawn D .; Court, John; Courtney, Lawrence .; Deimnger, David D .;
- A is preferably a tert-butyldimethylsilyloxy group or a triisopropylsilyloxy group, particularly a tert-butyldimethylsilyloxy group (proline having this group is referred to as "super-proline” Is preferred). This is because the reaction is completed in a much shorter time and the asymmetric yield is very high, compared to the case where A is a hydrogen atom (proline). It should be noted that super phosphorus is known (H. Ohtake, Y. Imada, S-1. Murahashi, Bull. Chem. Soc. Jpn. 1999, 72, 2737.).
- a ketone represented by the following general formula (2) and proline or a proline derivative (4) [(4 ′) is assumed to contain (4 ′) since the reaction proceeds in the same manner.
- the proline or proline derivative (4) is preferably used in an amount of 0.01 to 1 equivalent to the nitroso compound (3), particularly preferably 0.1 to 0.3 equivalent.
- the organic solvents used here include DMF, DMSO, CH NO
- polar solvents such as NMP (N-methyl-pyrrolidinone), CHCN, CHC1, CHCI, etc. are preferred, but are not limited to these.
- the obtained solution of ketone and proline or proline derivative (4) may be cooled at a temperature of -50 ° C to 25 ° C, preferably -10 ° C to 10 ° C during the next reaction. It is best to keep this temperature.
- the ketone is preferably used in an amount of 115 equivalents to the nitroso compound, and particularly preferably 23 equivalents.
- the nitroso compound represented by the general formula (3) is dissolved in the above-mentioned solvent, and this is added to the ketone and the solvent of proline or the proline derivative (4).
- the time for adding the nitroso compound solution to the solution of ketone and proline or proline derivative (4) is preferably 1 minute to 24 hours, and particularly preferably 3 to 12 hours. In the case of the above-mentioned superproline, 5 minutes to 5 hours are preferable. Thereafter, stirring is carried out for 10 minutes to 1 hour while maintaining the above-mentioned temperature to obtain the aminoaminoketone.
- Example 1 (Table 2, No. 1) Cyclohexanone (1.2 mmol), L_proline (0.18 mmol) 3 ⁇ 4r Dissolve in 2.7 mL of DMF solution and cool to 0 ° C. To this solution is added dropwise a solution of nitrosobenzene (0.6 mmol) in DMF (0.9111) over 5.5 hours. After dropping, stir at the same temperature for 30 minutes. The reaction was stopped by adding a phosphate buffer, the organic matter was extracted with ethyl acetate, and the organic phase was washed with a saline solution.
- Example 8 (Table 3, entry 1, catalyst 10 mol% temperature-20 ° C)
- Extract with acidified chill wash the organic phase with brine and dry over Na 2 SO 4.
- the alcohol is quantitatively obtained with 99% ee.
- Butanal (1.8 mmol) and nitrosoben are added to a CHCN solution (3.0 mL) of proline (0.06 mmol).
- Extract with acidified chill wash the organic phase with brine and dry over Na 2 SO 4.
- the alcohol is obtained in 88% yield and 98% ee.
- Optical purity was determined by HPLC analysis using a chiral column.
- Example 10 (Table 3, entry 3, catalyst 30 mol% temperature-20 ° C)
- the 3-amino alcohol is obtained with a yield of 81% and 98% ee.
- Example 11 (Table 3, entry 4, catalyst 30 mol% temperature 0 ° C)
- Losobenzene (0.6 mmol) was added at 0 ° C, and the mixture was stirred at the same temperature for 24 hours. After i-PrOH (1.0 mL) and NaBH (3 mmol) were added and stirred for 10 minutes, the reaction was stopped by adding a phosphate buffer, and the organic matter was added.
- Example 12 (Table 3, entry 5, catalyst 30 mol% temperature 0 ° C)
- nitrosobenzene (0.6 mmol) are added at _20 ° C, and the mixture is stirred at the same temperature for 24 hours. After i-PrOH (1.0 mL) and NaBH (3 mmol) were added and stirred for 10 minutes, the reaction was stopped by adding a phosphate buffer.
- the aminooxy ketone is obtained with a yield of 60% and 99% ee.
- the diastereomer ratio is 70:30.
- the optical purity was determined by HPLC analysis using a chiral column.
- the absolute configuration is from the diol obtained by reacting NaBH on 13a (13,2 shaku, 3 shaku, 53) -1,2-bis (-bromobenzoyloxy) -3,5-dimethylcyclohexane, determined by the CD-chirality method .
- Example 18 (Table 5, entry 6) To a DMF solution (8.1 mL) of 4-tert-butylcyclohexanone (2.2 mmol) and proline (0.18 mmol) was added a DMF solution (2.7 mL) of nitrosobenzene (1.8 mmol) at 0 ° C over 32 hours. Stir at temperature for 0.5 hour. The reaction is stopped by adding a phosphate buffer, the organic matter is extracted three times with ethyl acetate, and the organic phase is washed with brine and dried over Na 2 SO 4. Na SO by filtration
- the ⁇ -aminooxy ketone is obtained in a yield of 69% and the main product in 99% ee.
- the diastereomer ratio is 67:33.
- Cyclohexanone and dimethylcyclohexanone are used as ketones as shown in the above table.
- the corresponding ⁇ -aminooxyketone derivative was obtained with high yield and high enantioselectivity.
- a ketone having an acetal moiety at the 4-position a corresponding ⁇ -aminooxyketone derivative was obtained with high yield and high enantioselectivity.
- Cyclohexanone, dimethylcyclohexanone, tetrahydro-4H-thiopyran-4-one is The product is obtained in a much shorter time than with proline.
- cyclohexanone completed a reaction that took 5.5 hours of power in 15 minutes.
- the reaction of cycloheptanone and getyl ketone was slow with proline, but by using superproline, it was possible to synthesize para-aminooxyketone with a moderate yield. All the obtained compounds have very high asymmetric yields.
- the obtained compound can be derivatized to a hydroxyketone with a divalent copper salt (N. Momiyama, H. Yamamoto, J. Am. Chem. Soc, 2003, 125, 6038.) This reaction can be applied to a method for synthesizing para-hydroxyketone having high optical purity by asymmetric catalytic reaction from ketone.
- the corresponding optically active ⁇ -aminooxy ketone can be obtained from a ketone and a nitroso compound from a ketone and a nitroso compound by using a catalytic amount of proline.
- ⁇ -hydroxyketone can be efficiently obtained.
- an ⁇ -aminooxyketone derivative can be obtained directly from a ketone which does not require conversion of the ketone to an enolate or an equivalent thereof, and the optically active substance can be obtained at low cost.
- proline which can be easily prepared, can be used as a catalyst, and a high aminooxy ketone derivative having high yield and high optical purity can be obtained.
- the catalyst is proline
- proline has the feature of being inexpensive.
- the catalyst to be used is a proline derivative, particularly superproline described later, the corresponding aminoaminoketone can be produced in a much higher yield and with a higher enantioselectivity than proline in a short time. be able to.
- aminoaminoketone derivative can be easily derivatized to a hydroxyketone with a divalent copper salt (Momiyama et al.
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/569,757 US7279601B2 (en) | 2003-08-25 | 2004-08-20 | Optically active α-aminooxyketone derivatives and process for production thereof |
| EP04771969A EP1661885A4 (en) | 2003-08-25 | 2004-08-20 | OPTICALLY ACTIVE ALPHA-AMINO-OXYKETONE DERIVATIVES AND PROCESS FOR THEIR PREPARATION |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003300367 | 2003-08-25 | ||
| JP2003-300367 | 2003-08-25 | ||
| JP2004153944 | 2004-05-24 | ||
| JP2004-153944 | 2004-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005019159A1 true WO2005019159A1 (ja) | 2005-03-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/012008 Ceased WO2005019159A1 (ja) | 2003-08-25 | 2004-08-20 | 光学活性α−アミノオキシケトン誘導体及びその製造方法 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7279601B2 (ja) |
| EP (1) | EP1661885A4 (ja) |
| WO (1) | WO2005019159A1 (ja) |
-
2004
- 2004-08-20 US US10/569,757 patent/US7279601B2/en not_active Expired - Fee Related
- 2004-08-20 WO PCT/JP2004/012008 patent/WO2005019159A1/ja not_active Ceased
- 2004-08-20 EP EP04771969A patent/EP1661885A4/en not_active Withdrawn
Non-Patent Citations (6)
| Title |
|---|
| BROWN P S ET AL: "The Direct and Enantioselective Organocatalytic alpha-Oxidation of Aldehydes", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 125, no. 36, 19 August 2003 (2003-08-19), pages 10808 - 10809, XP002904211 * |
| HAYASHI Y ET AL: "Direct proline catalyzed asymmetric alpha-aminooxylation of aldhytes", TETRAHEDRON LETTERS, vol. 44, no. 45, 7 October 2003 (2003-10-07), pages 8293 - 8296, XP004463846 * |
| MOMIYAMA N ET AL: "Catalytic Enantioselective Synthesis of alpha-Aminooxy and alpha-Hydroxy ketone Using Nitrosobenzene", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 125, no. 20, 2003, pages 6038 - 6039, XP001160188 * |
| OHTAKE H ET AL: "Regioselective Synthesis of Nitrones by Decarboxylative Oxidation of N-Alkyl-alpha-amino Acids and Application to the Synthesis of 1-Azabicyclic Alkaloids", BULL. CHEM. SOC. JPN., vol. 72, 1999, pages 2737 - 2754, XP002904212 * |
| See also references of EP1661885A4 * |
| ZHONG C: "A Facile and rapid Route to Highly Enantiopure 1,2-Diols by Novel Catalytic Asymmetric alpha-Aminoxylation of Aldehydes", ANGEWANDTE CHEMIE, INTERNATIONAL EDITION, vol. 42, no. 35, 12 September 2003 (2003-09-12), pages 4247 - 4250, XP002904213 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1661885A1 (en) | 2006-05-31 |
| EP1661885A4 (en) | 2006-11-22 |
| US20060293525A1 (en) | 2006-12-28 |
| US7279601B2 (en) | 2007-10-09 |
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