WO2008003774A1 - Verfahren zur herstellung enantiomerenreiner flavanone - Google Patents
Verfahren zur herstellung enantiomerenreiner flavanone Download PDFInfo
- Publication number
- WO2008003774A1 WO2008003774A1 PCT/EP2007/056873 EP2007056873W WO2008003774A1 WO 2008003774 A1 WO2008003774 A1 WO 2008003774A1 EP 2007056873 W EP2007056873 W EP 2007056873W WO 2008003774 A1 WO2008003774 A1 WO 2008003774A1
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- WIPO (PCT)
- Prior art keywords
- alkyl
- ligand
- acyl
- general formula
- chiral
- Prior art date
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- 0 *c1ccc([C@](C2)Oc3c(*)c(*)c(*)c(*4CC4)c3C2=O)cc1 Chemical compound *c1ccc([C@](C2)Oc3c(*)c(*)c(*)c(*4CC4)c3C2=O)cc1 0.000 description 2
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
- C07D311/28—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only
- C07D311/30—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only not hydrogenated in the hetero ring, e.g. flavones
Definitions
- the invention relates to a process for preparing enantiomerically pure flavanones, in particular of prenylated flavanones, such as. B. enantiomerically pure (2S) - and (2i?) - 8-Prenylnaringenin.
- Flavanones of this kind in particular 8-prenylnaringenin, are distinguished by a variety of useful bioactivities and are particularly suitable for use in the field of pharmacy and cosmetics (review article: "Prenylated flavonoids: pharmacology and biotechnology", Botta, B. Vitali, A., Menendez, Misiti, D. Delle Monache, G. Curr Med Med Chem., 2005, 12, 713-739) and are applicable in the field of pharmacy and cosmetics.
- flavanones can be isolated from plants (Harborne, JB; Baxtor, H. (ed.) The Handbook of Natural Flavonoids, Vol. 1 + 2, Wiley: New York, 1999), with principally only the naturally occurring enantiomer available and the yield is often very low.
- Flavanone enantiomers have hitherto been obtained by separation of the racemic mixture by HPLC on chiral phases. This method was z.
- SERM selective estrogen receptor modulator
- 8-prenylnaringenin both on an analytical scale Prenylflavonoids: A new class of non-steroidal phytoestrogen (Part 1). Isolation of 8-isopentenylnaringenin and an initial study on its structure-activity relationship ", Kitaoka, M., Kadokawa, H., Sugano, M., Ichikawa, K., Taki, M., Takaishi, S., Iijima, Y., Tsutsumi, S., Boriboon, M.; Akiyama, T.
- (2iS) -8-Prenylnaringenin can be isolated from plants with low efficiency ("Studies on the constituents of Sophora species.”, "Constituents of the root of Sophora moorcroftiana Benth., Ex Baker. (I)", Y. Shirataki, I. Yokoe, M. Noguchi, T. Tomimori, M. Komatsu, Chem. Pharm. Bull. 1988, 36, 2220-2225).
- the object is achieved by a process in which a racemic mixture of a flavanone of the general formula rac-1:
- R 2 H, alkyl or halogen
- R 3 alkyl or acyl
- R 4 H, alkyl or acyl
- R 5 alkyl or acyl with a mixture of formic acid and a base, preferably a tertiary amine, more preferably triethylamine or another trialkylamine, is selectively reduced in the presence of a chiral catalyst.
- Alkyl in the present invention description and in the claims denotes an unsubstituted or substituted, saturated or unsaturated, straight-chain or branched, preferably non-aromatic hydrocarbon radical.
- the chiral catalyst is preferably a metal complex of the general formula:
- a central metal M selected from rhodium (III), ruthenium (II) or iridium (III),
- the unreacted enantiomer 1 can be very easily separated from the reaction product.
- this separation is carried out on ordinary silica gel, preferably in a column chromatography.
- the erfmdungssiee transfer hydrogenation shows a surprisingly high enantioselectivity - over 95% ee (enantiomeric excess) - for differently substituted flavanones, which is characterized this method by a wide range of applications.
- the enantioselectivity of the transfer hydrogenation according to the invention is markedly more pronounced than in the few known examples of the kinetic resolution of ⁇ -chiral ketones by other methods ("asymmetry hydrogenation of cyclie ⁇ , ⁇ -unsaturated ketones to chiral allylic alcohols ", Ohkuma, T .; Ikehira, H .; Ikariya, T .; Noyori, R.
- the transfer hydrogenation according to the invention is easy to use. A control of the conversion during the reaction is not necessary because it stops completely after hydrogenation of one enantiomer.
- Incomplete racemic starting material 1 can also be further enantiomerically enriched by this method.
- alkyl represents an unsubstituted or substituted, saturated or unsaturated, straight-chain or branched alkyl group having preferably 1 to 15 carbon atoms .
- the alkyl group is preferably selected from CH 3, C 2 H 5, C 2 H 3, C 3 H 7, C 3 H 5, C 4 H 9, C 4 H 7, C5H11, C5H9, C 10 H 21, C 10 H 17 , C15H31 and C15H25, particularly preferably selected from methyl, ethyl, ethenyl (vinyl), n-propyl, ⁇ -propyl, 2-propenyl (allyl), n-butyl, ⁇ o-butyl, 1-methylpropyl, tertiary -QvXyl, 3-methylbutyl, 1,1-dimethylpropyl, 3-methyl-2-butenyl (prenyl), 1,1-dimethylallyl, geranyl and farnesyl and diastereomers and hydrogenated derivatives of geranyl and farnesyl, such as. B. the hydrogenated residues 3,7-dimethyloctyl and 3,7,11-trimethyldodecyl.
- acyl represents an unsubstituted or substituted, saturated or unsaturated, straight-chain or branched acyl group having preferably 1 to 10 carbon atoms, more preferably 1 to 5
- halogen is selected from iodine, bromine, chlorine and fluorine.
- alkyl in R 5 , R 6 , R 7 and R 8 represents an unsubstituted or substituted, saturated or unsaturated, straight-chain or branched alkyl group Chain length of preferably 1 to 4 carbon atoms.
- alkyl in R 5 , R 6 , R 7 and R 8 is selected from methyl, ethyl, n-propyl or ⁇ o-propyl.
- aryl in R 5 and R 6 is preferably an unsubstituted or substituted phenyl group preferably having 6 to 8 carbon atoms.
- the ⁇ -ligand A is preferably selected from pentamethylcyclopentadienyl (Cp *), 1-methyl-4-isopropylbenzene or 1,3,5-trimethylbenzene.
- alkyl in R 1 , R 2 , R 3 and R 4 represents an unsubstituted or substituted, saturated or unsaturated, straight-chain or branched alkyl group having a chain length of preferably 1 to 4 carbon atoms. More preferred the radicals R 1 and R 2 in the chiral diamine ligand are covalently linked to an unsubstituted or substituted 3- to 5-membered chain, more preferably to (CH 2 ) ⁇
- aryl in R 1 , R 2 and R 3 is preferably an unsubstituted or substituted phenyl group.
- Aryl in R 1 , R 2 and R 3 in the chiral diamine ligand is preferably selected from phenyl or p-To IyI.
- the chiral diamine which forms the diamine ligand in the catalyst is preferably selected from (i, i) - ⁇ / - / - tolylsulfonyl-l, 2-diphenylethylenediamine, (S ⁇ -iV-p-tolylsulfonyl-1 , 2-diphenylethylenediamine, (i?, I?) - ⁇ / - /? - tolylsulfonyl-l, 2-cyclohexanediamine or (S, S) -Np-tolylsulfonyl-1, 2-cyclohexanediamine.
- the ⁇ ligand A and the chiral diamine ligand may be covalently linked together.
- the radicals R 3 and R 5 , or the radicals R 4 and R 5 , or the radicals R 3 and R 6 , or the radicals R 4 and R 6 are preferably covalently to form an unsubstituted or substituted 2- to 4-membered chain connected. Particularly preferred is a covalent linkage of the radicals R 4 and R 5 , or the radicals R 4 and R 6 to a 3-membered carbon chain.
- a catalyst with rhodium (III) is used as the central metal.
- the chiral catalyst preferably a rhodium catalyst, is preferably used in a loading of up to 20 mol%, more preferably below 2 mol%, based on the flavanone.
- Preferred amounts of catalyst are in the range below 0.5 mol%, particularly preferably 0.2 to 0.5 mol% (based on the flavanone).
- the amount of chiral catalyst can be reduced to 0.1 Mo 1-%.
- Particularly preferred reducing agents are formic acid / triethylamine and sodium formate.
- the chiral rhodium catalyst 3 which consists of penta-methylcyclopentadienylrhodium chloride dimer - [Cp * RhCl 2] 2 - and the chiral diamine (R, R) - or (S) -N - / - tolylsulfonyl-l, 2 -diphenylethylenediamine - (R, R) - or (£, S) -tsdpen - is formed in the presence of formic acid and triethylamine.
- modified catalyst systems for. Example, by changing the central metal atom of rhodium (III) to ruthenium (II) or iridium (III), by replacing the ⁇ ligand without changing the total electron number, such as a Change from pentamethylcyclopentadienyl to l-methyl-4-isopropylbenzene or 1,3,5-trimethylbenzene, or by varying the chiral diamine ligand corresponds to the process to be protected.
- ruthenium (II) or iridium (III) by replacing the ⁇ ligand without changing the total electron number, such as a Change from pentamethylcyclopentadienyl to l-methyl-4-isopropylbenzene or 1,3,5-trimethylbenzene, or by varying the chiral diamine ligand corresponds to the process to be protected.
- the product alcohol (2R, 4R) -2 or (2S, 4S) -2 can advantageously be converted by oxidation into the other enantiomer of 1 after separation from the unreacted isomer (2S) - 1 or (2R) -I.
- Tetraalkylammoniumperruthenat such as.
- TPAP tetrapropylammonium perruthenate
- NMO ⁇ / -Methylmorpholin-JV-oxide
- the enantioselective transfer hydrogenation and the subsequent oxidation of the reduction product result in both flavanone enantiomers being obtained in high yield.
- the acyl radicals at the radicals R 3 , R 5 and / or R 4 split off.
- This cleavage of the acyl radicals on the radicals R 3 , R 5 and / or R 4 in (2S) - 1 and / or (2R) -I is preferably carried out by means of enzyme-catalyzed solvolysis.
- step a) of claim 1 a selective reduction of the mixture of formula 9 with a mixture of formic acid and a base, preferably a tertiary amine, more preferably triethylamine, in the presence of a chiral catalyst.
- the chiral catalyst is a metal complex of the above general formula 2.
- the catalyst contains the above-mentioned ⁇ -ligand A of the general formula 3 and the chriamene diamine ligand of the general formula 4. Preferred embodiments of the catalyst are mentioned above.
- the ⁇ R, R) - and the other of the of the diamine ligand, such as. B. tsdpen optionally, the (2S) or (2i?) - enantiomer of 4 ', 7-O, O-diacylated 8-Prenylnaringeninderivats 1 can be obtained.
- An isolation of the chiral rhodium catalyst of the general formula 2 (for example the tsdpene derivative 3 shown in formula 7 or its precursor 3 initially formed with Rh-Cl instead of Rh-H) is advantageously not required.
- the (25) -enantiomer of the 8-prenylnarine derivative derivative 1 is hydrogenated to the alcohol of the general formula (2S, 4S) -2.
- the unreacted enantiomer (2R) -I can be very easily separated from the reaction product (corresponds to step b) of claim 1).
- this separation is carried out on ordinary silica gel, preferably in a column chromatography.
- racemic 4 ', 7-0.0-diacylated 8-prenylnaringenin derivative (rac-1) according to formula 9 required as substrate for the enantio-selective transfer hydrogenation can be chemo selectively synthesized from racemic naringenin ("An efficient synthesis of the potent phytoestrogens"). prenylnaringenin and 6- (1,1-dimethylallyl) naringenin by europium (III) - catalyzed Claisen rearrangement ", Gester, S., Metz, P. Zierau, O. Vollmer, G.
- the product alcohol (2R, 4R) -2 or (2S, 4S) -2 can advantageously be converted by oxidation into the other enantiomer of 1 after separation from the unreacted isomer (2S) - 1 or (2R) -I.
- TPAP tetrapropylammonium perruthenate
- NMO ⁇ / -methylmorpholine-JV-oxide
- the enantioselective transfer hydrogenation and the subsequent oxidation of the reduction product as a result advantageously afford both enantiomers of the 4 ', 7-O, O-diacylated 8-prenylnaringenin derivative 1 in high yield.
- the deacylation is preferably carried out in the presence of catalytic amounts of a lipase, more preferably Pseudomonas sp. Lipase, performed. With this lipase, the best results were obtained for R 3 and R 5 equal acetyl.
- a lipase more preferably Pseudomonas sp. Lipase, performed. With this lipase, the best results were obtained for R 3 and R 5 equal acetyl.
- this enzyme catalysis the cleavage of the acyl residues R 3 and R 5 into (2S) - or (2i?) - 8-prenylnaringenin is achieved without racemization.
- Embodiment 1 a) Enantioselective transfer hydrogenation
- reaction mixture is stirred for at least 2 h at room temperature and treated with saturated NaHCO 3 solution. After phase separation, the organic phase is washed once more with saturated NaHCO 3 solution, dried over MgSO 4 and the solvent removed in vacuo.
- the unreacted enantiomer (2S) -I is separated from the reaction product (2R, 4R) -2 by column chromatography on silica gel.
- the silica gel is deactivated with 1% NEt 3 in pentane / ethyl acetate 1: 1 (v / v), the ketone (2S) - 1 is eluted with pentane / ethyl acetate mixtures (or alternatively dichloromethane / diethyl ether mixtures) and then the alcohol (2R, 4R) -2 (eg with ethyl acetate) from the column. Removal of the solvent in vacuo yields the pure products (2S) -I and (2R, 4R) -2.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- Racemic 4 ', 7-O, O-diacetyl-8-prenylnaringenin (rac-la - see Formula 15) was synthesized from racemic naringenin according to a published method ("An efficient synthesis of the potent phytoestrogens 8-prenylnaringenin and 6- (" l, l-dimethylallyl) naringenin by europium (III) -catalyzed Claisen rearrangement ", Gester, S., Metz, P. Zierau, O. Vollmer, G. Tetrahedron 2001, 57, 1015-1018). a) Enantioselective transfer hydrogenation
- reaction mixture is stirred for 2 h at room temperature and treated with saturated NaHC0 3 solution. After phase separation, the organic phase is washed once more with saturated NaHCO 3 solution, dried over MgSO 4 , and the solvent removed in vacuo.
- the unreacted enantiomer (2S) - Ia is separated from the reaction product (2R, 4R) -2a by column chromatography on silica gel.
- the column is deactivated with 1% NEt 3 in pentane / ethyl acetate 1: 1 (v / v), the ketone (2S) - Ia is eluted with pentane / ethyl acetate 1: 1 (v / v) and then the alcohol (2R, 4R) -2a is rapidly rinsed from the column with ethyl acetate. Removal of the solvent in vacuo gives the pure products (2S) -Ia.
- the alcohol (2R, 4R) -2a can be converted into the enantiopure (2i?) - 4 ', 7-O, O-diacetyl-8-prenylnaringenin ((2i?) - la) be oxidized:
- Enantiomerically pure (2i?) - 8-prenylnaringenin is obtained in similar yields by deacetylation of the (2i?) - 4 ', 7-O, O-diacetyl-8-prenylnaringenin ((2i?) - 1a) obtained in step b.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE112007001531T DE112007001531B4 (de) | 2006-07-06 | 2007-07-06 | Verfahren zur Herstellung enantiomerenreiner Flavanone |
Applications Claiming Priority (4)
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DE102006032500.1 | 2006-07-06 | ||
DE102006032499.4 | 2006-07-06 | ||
DE200610032499 DE102006032499B4 (de) | 2006-07-06 | 2006-07-06 | Verfahren zur Herstellung enantiomerenreiner Flavanone |
DE200610032500 DE102006032500B3 (de) | 2006-07-06 | 2006-07-06 | Verfahren zur Herstellung von (2S)- und (2R)-8-Prenylnaringenin |
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WO2008003774A1 true WO2008003774A1 (de) | 2008-01-10 |
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PCT/EP2007/056873 WO2008003774A1 (de) | 2006-07-06 | 2007-07-06 | Verfahren zur herstellung enantiomerenreiner flavanone |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012004228A1 (en) * | 2010-07-06 | 2012-01-12 | Unilever Plc | Use of glabranin for stimulating hair growth |
CN103626731A (zh) * | 2013-12-05 | 2014-03-12 | 林瑞珏 | 一种黄烷酮类化合物 |
PL422923A1 (pl) * | 2017-09-21 | 2019-03-25 | Uniwersytet Przyrodniczy we Wrocławiu | 7-Izopropoksynaringenina, 7,4'-diizopropoksynaringenina i sposób jednoczesnego otrzymywania 7-izopropoksynaringeniny oraz 7,4'-diizopropoksynaringeniny |
PL422925A1 (pl) * | 2017-09-21 | 2019-03-25 | Uniwersytet Przyrodniczy we Wrocławiu | 5,7,4'-Tripropoksynaringenina i spoób otrzymywania 5,7,4'-tripropoksynaringeniny |
WO2021089840A1 (en) | 2019-11-08 | 2021-05-14 | Mrm Health N.V. | Fermentation method for the production of phytoestrogens |
WO2023150072A1 (en) | 2022-02-01 | 2023-08-10 | Sinclair David A | Compositions and methods for the preservation of plant matter |
-
2007
- 2007-07-06 WO PCT/EP2007/056873 patent/WO2008003774A1/de active Application Filing
- 2007-07-06 DE DE112007001531T patent/DE112007001531B4/de not_active Expired - Fee Related
Non-Patent Citations (3)
Title |
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FEHR C ET AL: "An efficient enantioselective synthesis of (+)-(R,Z)-5-Muscenone and (-)-(R)-Muscone - An example of a kinetic resolution and enantioconvergent transformation", EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, WILEY-VCH VERLAG, WEINHEIM, DE, 2004, pages 1953 - 1957, XP002365012, ISSN: 1434-193X * |
IKUO MIYAHISA ET AL: "Efficient production of (2S)-flavanones by Escherichia coli containing an artificial biosynthetic gene cluster", APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, SPRINGER-VERLAG, BE, vol. 68, no. 4, 1 September 2005 (2005-09-01), pages 498 - 504, XP019331939, ISSN: 1432-0614 * |
KITAOKA M ET AL: "PRENYLFLAVONOIDS: A NEW CLASS OF NON-STEROIDAL PHYTOESTROGEN (PART 1). ISOLATION OF 8-ISOPENTENYLNARINGENIN AND AN INITIAL STUDY ON ITS STRUCTURE-ACTIVITY RELATIONSHIP", PLANTA MEDICA, THIEME, STUTTGART, DE, vol. 64, no. 6, 1998, pages 511 - 515, XP000981725, ISSN: 0032-0943 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012004228A1 (en) * | 2010-07-06 | 2012-01-12 | Unilever Plc | Use of glabranin for stimulating hair growth |
CN103626731A (zh) * | 2013-12-05 | 2014-03-12 | 林瑞珏 | 一种黄烷酮类化合物 |
PL422923A1 (pl) * | 2017-09-21 | 2019-03-25 | Uniwersytet Przyrodniczy we Wrocławiu | 7-Izopropoksynaringenina, 7,4'-diizopropoksynaringenina i sposób jednoczesnego otrzymywania 7-izopropoksynaringeniny oraz 7,4'-diizopropoksynaringeniny |
PL422925A1 (pl) * | 2017-09-21 | 2019-03-25 | Uniwersytet Przyrodniczy we Wrocławiu | 5,7,4'-Tripropoksynaringenina i spoób otrzymywania 5,7,4'-tripropoksynaringeniny |
WO2021089840A1 (en) | 2019-11-08 | 2021-05-14 | Mrm Health N.V. | Fermentation method for the production of phytoestrogens |
WO2023150072A1 (en) | 2022-02-01 | 2023-08-10 | Sinclair David A | Compositions and methods for the preservation of plant matter |
Also Published As
Publication number | Publication date |
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DE112007001531A5 (de) | 2009-11-05 |
DE112007001531B4 (de) | 2012-01-19 |
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