WO1999006343A1 - Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol - Google Patents
Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol Download PDFInfo
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- WO1999006343A1 WO1999006343A1 PCT/HU1998/000072 HU9800072W WO9906343A1 WO 1999006343 A1 WO1999006343 A1 WO 1999006343A1 HU 9800072 W HU9800072 W HU 9800072W WO 9906343 A1 WO9906343 A1 WO 9906343A1
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- WIPO (PCT)
- Prior art keywords
- formula
- reduction
- ethanol
- dimethoxyphenyl
- catalyst
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- RTWOAVKBRMACKZ-UHFFFAOYSA-N 1-(3,4-dimethoxyphenyl)ethanol Chemical compound COC1=CC=C(C(C)O)C=C1OC RTWOAVKBRMACKZ-UHFFFAOYSA-N 0.000 title description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- IQZLUWLMQNGTIW-UHFFFAOYSA-N acetoveratrone Chemical compound COC1=CC=C(C(C)=O)C=C1OC IQZLUWLMQNGTIW-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims abstract description 4
- 239000003054 catalyst Substances 0.000 claims description 14
- 238000005984 hydrogenation reaction Methods 0.000 claims description 12
- 229910000564 Raney nickel Inorganic materials 0.000 claims description 10
- 239000007868 Raney catalyst Substances 0.000 claims description 6
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 5
- 239000012736 aqueous medium Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000003586 protic polar solvent Substances 0.000 claims description 2
- 238000009903 catalytic hydrogenation reaction Methods 0.000 abstract description 8
- 239000000047 product Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000006227 byproduct Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 244000309464 bull Species 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 239000007858 starting material Substances 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 3
- -1 bis-phenyl ethyl ethers Chemical class 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 150000008062 acetophenones Chemical class 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000007614 solvation Methods 0.000 description 2
- WJUFSDZVCOTFON-UHFFFAOYSA-N veratraldehyde Chemical compound COC1=CC=C(C=O)C=C1OC WJUFSDZVCOTFON-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- FPANKWJAKOGTMU-UHFFFAOYSA-N 1-methoxy-2-propoxybenzene Chemical compound CCCOC1=CC=CC=C1OC FPANKWJAKOGTMU-UHFFFAOYSA-N 0.000 description 1
- WAPNOHKVXSQRPX-UHFFFAOYSA-N 1-phenylethanol Chemical group CC(O)C1=CC=CC=C1 WAPNOHKVXSQRPX-UHFFFAOYSA-N 0.000 description 1
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 1
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 1
- 238000001159 Fisher's combined probability test Methods 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- XOBKSJJDNFUZPF-UHFFFAOYSA-N Methoxyethane Chemical compound CCOC XOBKSJJDNFUZPF-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- 230000001668 ameliorated effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- JGDFBJMWFLXCLJ-UHFFFAOYSA-N copper chromite Chemical compound [Cu]=O.[Cu]=O.O=[Cr]O[Cr]=O JGDFBJMWFLXCLJ-UHFFFAOYSA-N 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009904 heterogeneous catalytic hydrogenation reaction Methods 0.000 description 1
- 238000007327 hydrogenolysis reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 125000000468 ketone group Chemical group 0.000 description 1
- VXWPONVCMVLXBW-UHFFFAOYSA-M magnesium;carbanide;iodide Chemical compound [CH3-].[Mg+2].[I-] VXWPONVCMVLXBW-UHFFFAOYSA-M 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 230000000269 nucleophilic effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 239000012453 solvate Substances 0.000 description 1
- 125000003011 styrenyl group Chemical class [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- DBGVGMSCBYYSLD-UHFFFAOYSA-N tributylstannane Chemical compound CCCC[SnH](CCCC)CCCC DBGVGMSCBYYSLD-UHFFFAOYSA-N 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/18—Preparation of ethers by reactions not forming ether-oxygen bonds
- C07C41/26—Preparation of ethers by reactions not forming ether-oxygen bonds by introduction of hydroxy or O-metal groups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Definitions
- the subject of the present invention is the heterogenous catalytic hydrogenation process, suitable for scaling up, for the synthesis of l-(3,4- dimethoxyphenyl)ethanol (by other name ⁇ -methylveratryl alcohol) of formula I, by the reduction of 3,4-dimethoxyacetophenone of formula II.
- the title compound is the starting material to a number of important compounds and there is a growing demand for it. Among others, it can favourably be used for the preparation of the insecticide synergists described in WO 97/19040 and Hungarian patent applications No 3318/95 and 0893/97. Therefore, elaboration of an economical technology was required. It was necessary, that the crude product obtained in the process, be of high purity and does not require purification operations, like for instance distillation.
- the 1-phenylethanols substituted with methoxy groups are namely surprisingly sensitive compounds and they can be purified only with substantial losses.
- Raney-nickel J. Am. Chem. Soc. 70, 695 (1948); J. Chem. Soc. 3158 (1957); Ann. 714, 91 (1968); Bull. Soc. Chim. France 1972, 4324
- copper chromite J. Am. Chem. Soc. 53, 1090 (1931)
- Rhodium catalyst is inclined to also saturate the ring, platinum, depending on the solvent and the pH, may cause hydrogenolysis, i.e the ethylbenzene by-product of formula V. will appear.
- the literature suggests the use of 10% palladium-on charcoal catalyst (Paul Rylander, Catalytic Hydrogenation in Organic Synthesis; pi 03, Academic Press, 1979).
- the electron-donating alkoxy groups activate the benzylic carbon atom to nucleofilic substitution, thus the latter in the given environment, for instance on the surface of the catalyst may react with a nucleophilic partner, in our case with the solvent, i.e. alcohol, but it may even react with the product of the reduction, i.e. with the ⁇ -methylveratryl alcohol.
- a nucleophilic partner in our case with the solvent, i.e. alcohol
- the product of the reduction i.e. with the ⁇ -methylveratryl alcohol.
- Total amuont of the unreacted starting material and the ethylveratrole by-product was as little as about 0.5%.
- the high purity of the product is well shown by the phenomenon, that on standing it crystallized, although previously this compound was only known as a viscous oil and no data for its melting point have been disclosed.
- the subject of our invention in accordance with the above, is a process for the preparation of l-(3,4-dimethoxyphenyl)ethanol of formula I., by the reduction of 3,4-dimefhoxyacetophenone of formula II, characterized by, that the carbonyl group of the 3,4-dimethoxyacetophenone of formula II is reduced with 1 mol of hydrogen under catalytic hydrogenation conditions.
- the reduction is preferably carried out by use of Raney-nickel catalyst, in a protic solvent, preferably in aqueous medium, at 25-100 °C, preferably at a temperature between 50-100 °C, under a pressure of 1-20 bar, preferably under a pressure between 5-10 bar.
- Raney-nickel catalyst preferably neutral-weakly basic pH 7-9 promoted Raney-nickel is applied, in an amount of 0,05-0,5 part of mass.
- the product can be isolated by filtration followed by a simple evaporation, it is of high purity, it does not require further purification,
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
The subject of our invention is the process for the preparation of the 1-(3,4-dimethoxypheny)ethanol of formula (I), by the reduction of 3,4-dimethoxyacetophenone of formula (II), characterized in that the carbonyl group of the 3,4-dimethoxyacetophenone of formula (II) is reduced by 1 mol of hydrogen under the conditions of catalytic hydrogenation.
Description
Process for the preparation of l-(3,4-dimethoxyphenyI)ethanol
The subject of the present invention is the heterogenous catalytic hydrogenation process, suitable for scaling up, for the synthesis of l-(3,4- dimethoxyphenyl)ethanol (by other name α-methylveratryl alcohol) of formula I, by the reduction of 3,4-dimethoxyacetophenone of formula II.
The title compound is the starting material to a number of important compounds and there is a growing demand for it. Among others, it can favourably be used for the preparation of the insecticide synergists described in WO 97/19040 and Hungarian patent applications No 3318/95 and 0893/97. Therefore, elaboration of an economical technology was required. It was necessary, that the crude product obtained in the process, be of high purity and does not require purification operations, like for instance distillation. The 1-phenylethanols substituted with methoxy groups are namely surprisingly sensitive compounds and they can be purified only with substantial losses. On the effect of heat during the distillation, and/or on the effect of traces of acids or bases the above compounds readily transform into the bis-phenyl ethyl ethers of formula III (Chem. Pharm. Bull. 31, 3024 (1983); J. Chem. Soc. 3158 (1957); J. Am. Chem. Soc. 70, 1895 (1948)), or via dehydration they can form the styrene derivative of formula IV. (J. Am. Chem. Soc. 106, 1361 (1984)).
In the literature there are two basic methods for the synthesis of l-(3,4-dimethoxyphenyl)ethanol. According to the first method the compound is prepared by the reaction of 3,4-dimethoxybenzaldehyde and methylmagnesium iodide (Chem. Pharm. Bull. 31, 3024 (1983)), according to the second by the reduction of 3 ',4'-dimethoxyacetophenone (by other name acetoveratrone). The latter reduction can be performed by using sodium borohydride (Bull. Soc. Chim. France 1973 2667; J. Chem. Soc. Perkin 2 1994, 961 ; J. Am. Chem Soc. 86, 1 186 (1964)), tributyltin hydride (J. Org. Chem. 59 7138 ( 1994)), sodium in ethanol
(Arch. Pharm (Weinheim Ger.) 248, 139 (1910)), or aluminium isopropoxide (Ann. 1995, 677) in isopropanol. None of the above methods is suitable for large-scale technology, considering the costly reagents, the specific reaction conditions (eg. anhydrous solvents), the resulting waste materials, as well as the complicated work- up and purification procedures.
There is no reference in the literature for the heterogeneous catalytic hydrogenation of the acetoveratrone of formula II. This is surprising, since this route seems to be the most economical for the preparation of the compound of formula I, in an industrial scale. Hydrogenation of the carbonyl group requires active catalyst. For the reduction of acetophenones catalysts as platinum metals (platinum, palladium, rhodium, ruthenium, iridium) (Ann. 1924, 276; J. Org. Chem. 24, 1885 (1959); Bull. Chem. Soc. Jpn. 34, 32 (1961)), nickel (J. Am. Chem. Soc. 52, 4349 (1930); J. Org. Chem. 45, 1937, 1946 (1980)), Raney-nickel (J. Am. Chem. Soc. 70, 695 (1948); J. Chem. Soc. 3158 (1957); Ann. 714, 91 (1968); Bull. Soc. Chim. France 1972, 4324), or copper chromite (J. Am. Chem. Soc. 53, 1090 (1931)) may be used. The selectivity of these metals is, however, different. Rhodium catalyst is inclined to also saturate the ring, platinum, depending on the solvent and the pH, may cause hydrogenolysis, i.e the ethylbenzene by-product of formula V. will appear. For the catalytic hydrogenation of acetophenones the literature suggests the use of 10% palladium-on charcoal catalyst (Paul Rylander, Catalytic Hydrogenation in Organic Synthesis; pi 03, Academic Press, 1979).
Our first experiments verified that the known methods cannot directly be used. Hydrogenation of the acetoveratrone of formula II, following the procedure suggested by the literature, using 10% palladium-on charcoal catalyst, under normal conditions (25 °C, 1 arm), in methanol as solvent, did not lead to homogeneous product. Beside the expected l-(3,4-dimethoxyphenyl)ethanol a high amount of efhylveratrole was also formed. The hydrogenation of the keto group and the hydrolysis of the C-0 bond of the product proceeded simultaneously, at comparable rate, and in addition a considerable amount of l-(3,4-dimethoxyphenyl)ethyl methyl ether by-product was also isolated. The electron-donating alkoxy groups activate
the benzylic carbon atom to nucleofilic substitution, thus the latter in the given environment, for instance on the surface of the catalyst may react with a nucleophilic partner, in our case with the solvent, i.e. alcohol, but it may even react with the product of the reduction, i.e. with the α-methylveratryl alcohol. To all this is added the sensitivity of the desired α-mefhylveratryl alcohol of formula I, which makes the accomplishment of the process even more difficult, and which also explains why hydrogenation was not used for the preparation of that compound.
The growing demand for the compound in question, as well as the inexpensive implementation of catalytic hydrogenations, inspired us, despite the above difficulties, to work out a hydrogenation process which is exempt from the above disadvantages, ie. which results the desired compound of formula I in higher yield, higher purity and more economically than the previous methods.
Although rarely, but nickel and Raney-nickel are also used for the hydrogenation of phenones, the reactions being carried out mainly in ethanolic or methanolic medium. According to the relevent literature a successful reaction requires rather drastic conditions (Paul Rylander, Catalytic Hydrogenation in Organic Synthesis, p83, Academic Press, 1979). As a concequence, one can expect in these reactions as well, the appearance of the appropriate 1-phenylethyl ethyl or methyl ether. The formation of this by-product can theoretically be exluded if aqueous medium or neutral catalyst is applied. Even though, no example can be find in the literature for hydrogenation of the given group of compounds in aqueous medium. The reason for that may be that the starting material and the product as well are expected to be rather insoluble in water, their solvation does not proceed, while the surface of the catalyst is deactivated, due to the polar solvate layer. (Paul Rylander, Catalytic Hydrogenation in Organic Synthesis, p83, Academic Press, 1979), all of these will cause the slowing-down of the reduction, and in the light of the above, the formation of by-products. To investigate this point, we calculated the partition ratio of acetoveratrone. To our surprise, a rather low value (calculated lgP≤l,22, K(octanol, water)≥16) was obtained. This means that the material has a weak hydrophilic character and a
suitable polarity. By increasing the temperature this value may further be ameliorated, which means that there was a chance that the reaction can proceed and the by-product formation can be suppressed. Carrying out the hydrogenation at a temperature higher than the melting point of the starting material (50°C), suitable dispersity and solvation equlibrium may be ensured by vigourous stirring of the melt in the aqueous medium. Our expectations have been proven by our experiments. We investigated the hydrogenation of acetoveratrone at 20-80°C, by using neutral Raney-nickel catalyst. After 5-48 hours full transformation and the formation of homogeneous product was observed. If the reaction was performed at 50-80°C, under 6-10 bar hydrogen pressure, full conversion was achieved in much shorter time, depending on the intensity of the stirring (700-1250 1/min) the reaction accomplished in 3-7 hours. The product was obtained from the reaction mixture following evaporation under reduced pressure. Yields were in each case over 98%. As shown by analytical investigation (GC, HPLC, VRK) starting from a raw material of over 98% purity the assay for the product was higher than 97%.
Total amuont of the unreacted starting material and the ethylveratrole by-product was as little as about 0.5%. The high purity of the product is well shown by the phenomenon, that on standing it crystallized, although previously this compound was only known as a viscous oil and no data for its melting point have been disclosed.
The subject of our invention, in accordance with the above, is a process for the preparation of l-(3,4-dimethoxyphenyl)ethanol of formula I., by the reduction of 3,4-dimefhoxyacetophenone of formula II, characterized by, that the carbonyl group of the 3,4-dimethoxyacetophenone of formula II is reduced with 1 mol of hydrogen under catalytic hydrogenation conditions.
The reduction is preferably carried out by use of Raney-nickel catalyst, in a protic solvent, preferably in aqueous medium, at 25-100 °C, preferably at a temperature between 50-100 °C, under a pressure of 1-20 bar, preferably under a pressure between 5-10 bar.
As for Raney-nickel catalyst preferably neutral-weakly basic pH 7-9 promoted Raney-nickel is applied, in an amount of 0,05-0,5 part of mass.
The present process has a number of advantages compared to the previously known processes:
• the yield is practically quantitative,
• the product can be isolated by filtration followed by a simple evaporation, it is of high purity, it does not require further purification,
• the product is in crystalline form, thus it is more stable, more easy to handle, and it can be stored better,
• the catalyst which has been filtered off, can be re-used in the next reduction,
• the use of water as solvent is very advantageous, considering both safety and economy,
• the technology has a good capacity factor, the reactor volume is well utilized, while the reaction time is only a few hours,
• waste materials, by-products are not formed.
Further details of the invention are demonstrated by the following examples, without limiting the claims to the examples.
Example 1.
Into a 10-L hydrogenation vessel, equipped with an internal coil for heating and cooling, stirrer, manometer and thermometer, 3.5 kg (19,4 mol) of 3,4-dimethoxy- acetophenone are placed and to it 0.26 kg (0,074 mass part) slurry of finely- powdered Raney-nickel (pH=8-9) promoted catalyst are washed with 1 kg of water. The reactor is filled with 3.5 kg of water, flushed with nitrogen, then with hydrogen, and under intensive stirring (revolution per minute is approx. 1420 min"1) the mixture is reacted at 70-85°C with hydrogen under 8-10 bar. After 7 hours the hydrogen consumption is ceased. Closing the hydrogen inlet, the reaction is post- hydrogenated for half an hour, then it is cooled. The catalyst is removed by filtration. The filtrate is concentrated in vacuo (20 torr) by a rotary evaporator, in a 40-50°C water-bath. The product is a yellow viscous oil, weight 3.48 kg (19, 1 mol, 98,5%). Refractive index (NaD, 25°C) is 1,5385; assay by HPLC is 97,3%; water content by Karl-Fisher method is 1,2%. TLC (Kieselgel 60 F25 benzene-EtAc 7:3 v/v) shows one spot (Rf=0.28, visualized by UV light and PMA).
An aliquot part is crystallized from 1.5-fold volume of diethyl ether - light petroleum (2:1, v/v) mixture. Melting point of the thus obtained white crystals is 34- 35 °C.
Confirmation of structure
IR (KBr, cm"1) v: 3312, 3056, 3006, 2966, 2926, 2880, 2844, 1608, 1594, 1522, 1467, 1261, 1237, 1162, 1140, 1091, 1075, 1028, 861, 814. IH-NMR (200 MHz, CDC13) δ: 1.47 (3H, d, J=6.4 Hz, CH3), 2.08 (IH, s, OH),
3.86 and 3.88 (total 6H, each s, CH30), 4.83 (IH, q, J=6.4 Hz, CHOH), 6.79-6.93 (3H, m, aromatic).
1 C-NMR (50 MHz, CDCI3) δ: 25.05 (CH3), 55.79 and 55.89 (CH30), 70.10
(ArCH), 108.65 (C-2), 1 10.98 (C-5), 1 17.48 (C-6), 138.57 (C-l), 148.28 and 149.0 (C-3, C-4).
Literature data
CAS No: 5653-65-6
CA name: l-(3,4-dimethoxyphenyl)-ethanol B.p. 145-150 (4 torr), refractive index (Zhur. Obshchei Khim. 27, 2142 (1957), CA 52; 8089g) (NaD 20°C) 1.5440.
• IH-NMR (200 MHz, CDC13) δ: 1.48 (d, J=6.5 Hz), 3.86 and .89 (s), 4.84 (q), 6.8-6.94 (m).
• 13c-NMR (Ann- 1977- 588) (50 MHz' CDC13) δ: 25.0, 55.8, 55.9, 70.1, 108.7, 111.1, 117.5, 138.6, 148.4, 149.1.
Example 2.
Into a hydrogenation vessel, equipped with an internal coil for heating and cooling, manometer and thermometer 50 g (0.278 mol) of 3,4-dimethoxy-acetophenone are placed and to it 7.5 g (0.15 mass part) slurry of finely-powdered Raney-nickel (pH=8-9) promoted catalyst are washed with 50 ml of water. The reactor is flushed with nitrogen, then with hydrogen, and is reacted at 70-85cC with hydrogen under 8-10 bar, while agitating with a shaker. After 3.5 hours the hydrogen consumption is ceased. Closing the hydrogen inlet, the reaction is post-hydrogenated for half an hour,- then it is cooled. The catalyst is removed by filtration. From the filtrate water is evaporated in vacuo (20 torr) by a rotary evaporator, in a 40-50°C water-bath. The produc is a yellow viscoseous oil, mass: 49.6 g (0.273 mol, 98%). The quality of the product is similar to that of the product obtained in Example 1
Claims
Claims
1) Process for the preparation of l-(3,4-dimethoxyphenyl)ethanol of formula I by the reduction of 3,4-dimethoxyacetophenone of formula II., characterized by, that the carbonyl group of 3,4- dimethoxyacetophenone of formula II. is reduced by 1 mol of hydrogen under the conditions of catalytical hydrogenation.
2) Process according to claim 1, characterized by, that the reduction is carried out by using Raney-nickel catalyst.
3) Process according to claims 1-2, characterized by, that as for catalyst preferably neutral-weakly basic, pH 7-9, promoted Raney-nickel is used, in an amount of 0,05-0,5 part of mass.
4) Process according to claims 1-3, characterized by, that the reduction is performed in the presence of a protic solvent, preferably in aqueous medium.
5) Process according to claims 1-4 characterized by, that the reduction is performed at a temperature between 25-100 °C, preferably between 50-100 °C.
6) Process according to claims 1-5, characterized by, that the reduction is performed by using hydrogen under a pressure of 1-20 bar, preferably 5-10 bar.
7) Highly pure, crystalline l-(3,4-dimethoxyphenyl)ethanol of formula I , with melting point of 33-36 °C.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98936579A EP1000005B1 (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
| DE69814865T DE69814865D1 (en) | 1997-07-31 | 1998-07-28 | METHOD FOR PRODUCING 1- (3,4-DIMETHOXYPHENYL) ETHANOL |
| AT98936579T ATE240922T1 (en) | 1997-07-31 | 1998-07-28 | METHOD FOR PRODUCING 1-(3,4-DIMETHOXYPHENYL)ETHANOL |
| KR1020007001071A KR20010022485A (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
| JP51069899A JP2002509549A (en) | 1997-07-31 | 1998-07-28 | Preparation process of 1- (3,4-dimethoxyphenyl) ethanol |
| IL13315098A IL133150A0 (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl) ethanol |
| US09/445,508 US6403843B1 (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
| AU85541/98A AU8554198A (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
| CA002294014A CA2294014C (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
| EA200000177A EA002328B1 (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HU9701335A HU219175B (en) | 1997-07-31 | 1997-07-31 | Process for producing 1-(3,4-dimethoxy-phenol)-ethanol |
| HUP9701335 | 1997-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999006343A1 true WO1999006343A1 (en) | 1999-02-11 |
Family
ID=89995449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/HU1998/000072 WO1999006343A1 (en) | 1997-07-31 | 1998-07-28 | Process for the preparation of 1-(3,4-dimethoxyphenyl)ethanol |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US6403843B1 (en) |
| EP (1) | EP1000005B1 (en) |
| JP (1) | JP2002509549A (en) |
| KR (1) | KR20010022485A (en) |
| CN (1) | CN1286674A (en) |
| AT (1) | ATE240922T1 (en) |
| AU (1) | AU8554198A (en) |
| CA (1) | CA2294014C (en) |
| DE (1) | DE69814865D1 (en) |
| EA (1) | EA002328B1 (en) |
| HU (1) | HU219175B (en) |
| IL (1) | IL133150A0 (en) |
| WO (1) | WO1999006343A1 (en) |
| ZA (1) | ZA986539B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000040535A1 (en) * | 1999-01-08 | 2000-07-13 | Rhodia Chimie | Method for preparing a benzylic-type ether |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112811991A (en) * | 2021-02-01 | 2021-05-18 | 惠泽化学科技(濮阳)有限公司 | Synthesis method of p-methoxystyrene |
-
1997
- 1997-07-31 HU HU9701335A patent/HU219175B/en not_active IP Right Cessation
-
1998
- 1998-07-22 ZA ZA986539A patent/ZA986539B/en unknown
- 1998-07-28 AT AT98936579T patent/ATE240922T1/en not_active IP Right Cessation
- 1998-07-28 WO PCT/HU1998/000072 patent/WO1999006343A1/en not_active Application Discontinuation
- 1998-07-28 JP JP51069899A patent/JP2002509549A/en not_active Withdrawn
- 1998-07-28 CA CA002294014A patent/CA2294014C/en not_active Expired - Fee Related
- 1998-07-28 US US09/445,508 patent/US6403843B1/en not_active Expired - Fee Related
- 1998-07-28 EA EA200000177A patent/EA002328B1/en not_active IP Right Cessation
- 1998-07-28 IL IL13315098A patent/IL133150A0/en unknown
- 1998-07-28 KR KR1020007001071A patent/KR20010022485A/en not_active Application Discontinuation
- 1998-07-28 AU AU85541/98A patent/AU8554198A/en not_active Abandoned
- 1998-07-28 DE DE69814865T patent/DE69814865D1/en not_active Expired - Lifetime
- 1998-07-28 EP EP98936579A patent/EP1000005B1/en not_active Expired - Lifetime
- 1998-07-28 CN CN98807666A patent/CN1286674A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| A. G. DAVIES ET AL: "Alkyl-oxygen fission in carboxylic esters. Part XV. 2,4-dimethoxydiphenylmethanol, 1-(2,4-dimethoxyphenyl)ethanol, and 1,2,2,2-tetra-p-methoxyphenylethanol", JOURNAL OF THE CHEMICAL SOCIETY, 1957, LETCHWORTH GB, pages 3158 - 3161, XP002084226 * |
| A. MÜLLER ET AL: "Ueber die Dimerisation des Isoeugenolmethyläthers (Harzphenole I).", BERICHTE DER DEUTSCHEN CHEMISCHEN GESELLSCHAFT, vol. 75, no. 6, 6 June 1942 (1942-06-06), WEINHEIM DE, pages 692 - 703, XP002084225 * |
| B. FIGADERE ET AL: "Carbonyl reduction of functionalized aldehydes and ketones by tri-n-butyltin hydride and SiO2", JOURNAL OF ORGANIC CHEMISTRY, vol. 59, no. 23, 1994, EASTON US, pages 7138 - 7141, XP002084228 * |
| C. H. LUDWIG ET AL: "Lignin. XII. The high resolution nuclear magnetic resonance spectroscopy of protons in compounds related to lignin", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 86, 20 March 1964 (1964-03-20), DC US, pages 1186 - 1196, XP002084227 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000040535A1 (en) * | 1999-01-08 | 2000-07-13 | Rhodia Chimie | Method for preparing a benzylic-type ether |
| US6608232B1 (en) | 1999-01-08 | 2003-08-19 | Rhodia Chimie | Method for preparing a benzylic-type ether |
Also Published As
| Publication number | Publication date |
|---|---|
| HU9701335D0 (en) | 1997-09-29 |
| EP1000005B1 (en) | 2003-05-21 |
| ZA986539B (en) | 1999-02-23 |
| IL133150A0 (en) | 2001-03-19 |
| DE69814865D1 (en) | 2003-06-26 |
| HUP9701335A3 (en) | 1999-10-28 |
| CA2294014C (en) | 2004-05-18 |
| EA200000177A1 (en) | 2000-08-28 |
| EP1000005A1 (en) | 2000-05-17 |
| CA2294014A1 (en) | 1999-02-11 |
| HUP9701335A2 (en) | 1999-05-28 |
| US6403843B1 (en) | 2002-06-11 |
| JP2002509549A (en) | 2002-03-26 |
| EA002328B1 (en) | 2002-04-25 |
| AU8554198A (en) | 1999-02-22 |
| ATE240922T1 (en) | 2003-06-15 |
| KR20010022485A (en) | 2001-03-15 |
| CN1286674A (en) | 2001-03-07 |
| HU219175B (en) | 2001-02-28 |
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