WO2001023397A1 - Procede de preparation d'hexasaccharide - Google Patents
Procede de preparation d'hexasaccharide Download PDFInfo
- Publication number
- WO2001023397A1 WO2001023397A1 PCT/CN2000/000225 CN0000225W WO0123397A1 WO 2001023397 A1 WO2001023397 A1 WO 2001023397A1 CN 0000225 W CN0000225 W CN 0000225W WO 0123397 A1 WO0123397 A1 WO 0123397A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- trisaccharide
- donor
- acceptor
- glycosyl
- hexasaccharide
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H9/00—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical
- C07H9/02—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical the hetero ring containing only oxygen as ring hetero atoms
- C07H9/04—Cyclic acetals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H3/00—Compounds containing only hydrogen atoms and saccharide radicals having only carbon, hydrogen, and oxygen atoms
- C07H3/06—Oligosaccharides, i.e. having three to five saccharide radicals attached to each other by glycosidic linkages
Definitions
- the present invention relates to a method for preparing an oligosaccharide, in particular to a method for preparing an oligosaccharide having biological activity and capable of being used as an activator of a plant self-defense system, and more particularly to a plant self having a function as a pesticide Method for preparing defense system activator hexasaccharide. Background technique
- Oligosaccharides can be used as an activator of plant self-defense system (Elicitor), which was discovered by American Albersheim in 84 years [JK Sharp, B. Valent, P. Albersheim, J. Biol. Chem., 1984, 259, 1 13 12.]
- oligosaccharide activators can increase the metabolism of phenylpropylase, and this enzyme can catalyze the biosynthesis of Phytoalexin in legumes.
- Oligosaccharide activators are a class of molecules that regulate special metabolism and gene expression at the level of DNA transcription. Fungal pathogens V g ⁇ Phytophthora megasperma f. Heptasaccharide ⁇ glucose mycelia wall sp.
- the purpose of the present invention is to adopt a new idea based on the synthetic oligosaccharides [China Patent Application Nos. 97125788.4, 98103241.1, 98103242.7] that we invented in the past, that is, 1,2: 5,6-di-0-isopropylidene
- glucosyl provides a method for preparing hexasaccharide, which is a simple, time-saving, labor-saving, low-cost, and industrially-available, industrially-available plant self-defense system activator.
- the object of the present invention is achieved by using trichloroacetimide ester or halide 1 of acyl glucose as a glycosyl donor, and 1,2: 5,6-di-0-isopropylidene Glucose 2 is a glycosyl acceptor.
- trichloroacetimide ester or halide 1 of acyl glucose as a glycosyl donor
- Glucose 2 is a glycosyl acceptor.
- the glycosyl donor 1 is coupled with the glycosyl acceptor 4 to obtain the trisaccharide 5, the 5 is hydrolyzed under acidic conditions to obtain 6, and then acetylated to obtain 7, and then the acetyl group at the 1-position is selectively removed to obtain 8, 8 was activated, and trisaccharide donor 9 was obtained.
- a similar method is used to synthesize a trisaccharide acceptor of glucose at the 6-position as a free hydroxyl group, couple the trisaccharide donor with the trisaccharide acceptor, and then deprotect to obtain the desired hexasaccharide.
- the present invention relates to a method for preparing a hexasaccharide of the following formula 16.
- the method includes:
- a trichloroacetimide ester or halide of a glucosyl acyl glucose as a glycosyl donor, and using 1, 2: 5: 6-di-0-isopropylidene-protected glucose as a glycosyl acceptor
- the glycosyl donor and the glycosyl acceptor are separately dissolved in a substituted alkane, and then the two are mixed and reacted in the presence of a Lewis acid catalyst to prepare a 1 ⁇ 3 j8 linked sugar, which is selectively hydrolyzed to 5 , 6-0-Isopropylidene group to obtain a disaccharide with a free hydroxyl group at position 5.6 as a glycosyl acceptor, and a monosaccharide glycosyl donor and a disaccharide glycosyl acceptor are carried out in the presence of a Lewis acid catalyst
- the coupling reaction obtains a trisaccharide, and then the trisaccharide is hydrolyzed under acid
- Glucose donors with different acyl groups at the 6 and 2, 3, and 4 positions are used as glycosyl donors to perform the coupling reaction with the above-mentioned disaccharide acceptor in the presence of a Lewis acid catalyst to obtain the corresponding trisaccharides, and to selectively hydrolyze them Remove the acyl group at position 6 to obtain a trisaccharide receptor;
- the above-prepared trisaccharide donor and trisaccharide acceptor were subjected to a coupling reaction in the presence of a Lewis acid catalyst to obtain a partially protected hexasaccharide, and the isopropylidene group of the hexasaccharide was hydrolyzed to expand at the same time to obtain only 1 and 2 positions. It is a free hexasaccharide, and then acylation reaction is performed on the 1-position and 2-position, and then all the acyl groups are removed with a base to obtain the free hexasaccharide 16.
- the halogenated alkane may be dichloromethane, dichloroethane, or the like.
- acyl glucose 1 as the glycosyl donor
- 1,2: 5,6-di-0-isopropylidene-protected glucose 2 as the glycosyl acceptor
- the base acceptors were separately dissolved in dichloromethane, and then the two were mixed, and reacted under Lewis acid catalysis and stirred at room temperature for 2-4 hours to prepare 1,3- ⁇ -linked disaccharide 3.
- the 5,6-0-isopropylidene group is selectively hydrolyzed to obtain a disaccharide 4 having a free hydroxyl group at the 5 and 6 positions, and the equimolar ratio of the glycosyl donor 1 and the glycosyl acceptor 4 is catalyzed by Lewis acid. Coupling at room temperature with stirring to obtain trisaccharide 5, hydrolyzing 5 under acidic conditions to obtain 6, then acetylating to obtain 7, and then selectively removing the acetyl group at position 1 to obtain 8, 8 reacting with trichloroacetonitrile, The trisaccharide sugar donor 9 was obtained. As shown below:
- R CH 3 CO- (acetyl) or PhCO- (benzoyl)
- a similar method is used to synthesize a glucose trisaccharide acceptor with a free hydroxyl group at the 6-position, that is, a sugar with 6-0-nonbenzoyl-2,3,4-tri-0-benzoyl- ⁇ -D-glucose.
- Donor or 6-0-non-acetyl-2, 3, 4-tri-0-acetyl-aD-glucose glycosyl donor
- the corresponding trisaccharide 11 is obtained by coupling under stirring at room temperature, and the non-benzoyl group at position 6 is selectively hydrolyzed to obtain the trisaccharide acceptor 12, as shown in the figure below:
- X Br or CI or an ester group such as CCl 3 C (NH) 0- 0
- the R group is acetyl or benzoyl
- X is bromine, chlorine or an ester group such as trichloroacetimide ester.
- the R group when the R group is benzoyl, the R group is acetyl or chloroacetyl or tribenzyl; when the R group is acetyl, the R is chloroacetyl or Trimethyl, X is bromo, chloro or trichloroacetimide.
- the R group is acetyl or benzoyl.
- the Lewis acid is a silver salt such as silver carbonate, silver triflate, or boron trifluoride,
- the reaction steps of the hexasaccharide have been greatly simplified.
- the present invention omits a dozen reaction steps, and the reagents used are cheap and easy to use. Therefore, the preparation cost of the hexasaccharide is greatly reduced, so that its industrialized production becomes possible.
- the hexasaccharide prepared by the present invention has not been mass-produced or scale-produced in the world so far.
- the preparation method of the hexasaccharide according to the present invention has now achieved industrialized production, which is the first in the world.
- Benzoyl glucose trichloroacetimide ester 1 (5.6 g, 7.56 mmol) was dissolved in 40 ml of dichloromethane to obtain solution A
- 1,2: 5,6-diisopropylidene glucose 2 (2.8 g (10.77. Mmol) was dissolved in 20 ml of dichloromethane to obtain solution B.
- B and A were mixed to obtain solution C
- TMSOTF trimethylsilyl triflate
- the reaction solution was diluted with 100 ml of dichloromethane, diluted with 0.5% HC1 / CH 3 0H solution and stirred for 1 hour, and the 5,6-0-isopropylidene group was selectively hydrolyzed, and triethylamine was neutralized.
- the solvent was distilled off under pressure, and the residue was purified by silica gel column chromatography. Ethyl acetate / petroleum ether (1/2) was used as the eluent, and the corresponding components were collected. Disaccharide 4 (5.43 g) was obtained, yield: 90%.
- Benzoyl glucose trichloroacetimide ester 1 (3.7 g, 5.01 mmol) was dissolved in 30 ml of dichloromethane to obtain solution A
- disaccharide 4 (4.0 g, 5.01 mmol) was dissolved in 30 ml of dichloromethane
- solution B mix B and A to obtain solution C.
- TMSOTF 0.05 mmol to C under ice-salt bath cooling, and then naturally return to room temperature. After reacting at room temperature for 3 hours, thin layer chromatography analysis shows that the reaction is complete. .
- the reaction solution was neutralized with triethylamine, washed with water, and the aqueous phase was discarded. The dried product was vacuum-dried under vacuum.
- the crude product was purified by silica gel column chromatography, and ethyl acetate / petroleum ether (1/1) was used. As the eluent, collect the corresponding components to obtain pure trisaccharide 5 (5.86 g). Yield: 85%.
- Trisaccharide 5 (6.0 g, 436 mmol) was dissolved in 50 ml of 80% acetic acid aqueous solution, 10 ml of 1 M sulfuric acid was added, and the mixture was hydrolyzed with stirring at 60 ° C. The reaction was detected by thin layer chromatography. After the reaction was completed, the reaction solution was Evaporate to dryness under reduced pressure. The crude product is purified by silica gel column chromatography, washed with ethyl acetate / petroleum ether (1/1) as eluent, and the corresponding components are collected to obtain pure trisaccharide 6 ( 5 . 24 g) yield: 90%, 6 to a conventional manner using acetic anhydride / pyridine quantitatively acetylated, acylated to give full trisaccharide 7. (4) Preparation of trisaccharide donor 9:
- Trisaccharide 7 (5.5 g, 3.76 mg molecules) was dissolved in 30 ml of dimethylformamide, and NH 4 HC0 3 3 g was added. The reaction was performed at room temperature, and the reaction was detected by thin layer chromatography. After the reaction was completed, the pressure was reduced. The solvent was evaporated to dryness, and the crude product was purified by silica gel column chromatography. Ethyl acetate / petroleic acid (1/1) was used as the eluent, and the corresponding components were collected to obtain pure trisaccharide 8 (4.8 g).
- the 6-0- acetyl _ 2, 3, 4 _ tri-O-benzoyl-glucose -CC-D- trichloroacetimidate 10 (5 g, 6.26 mmole) and disaccharides receptor 4 (4.86 G, 6.89 mg molecules) were dissolved in 50 ml of dichloromethane, TMSOTf (0.08 mmol) was added under cooling in an ice-salt bath, and then naturally returned to room temperature. The reaction was carried out under nitrogen protection at room temperature under stirring, and analyzed by thin layer After detection, after the reaction is completed, the product is post-processed by conventional methods.
- the crude product is purified by silica gel column chromatography, washed with ethyl acetate / petroleum ether (1/1) as the eluent, and the corresponding components are collected to obtain trisaccharide 11 (6.99 G), yield: 85%.
- Dissolve 11 (8 g, 6.09 mg molecules) in a methanol solution containing 0.5% dry hydrogen chloride, react at room temperature with stirring, and detect by thin layer analysis. When the detection shows that the acetyl group has been selectively removed, The reaction product was neutralized by adding sodium carbonate, and the solvent was evaporated to dryness under reduced pressure.
- Trisaccharide 12 (6.97 g), yield: 90%.
- the crude product was purified by silica gel column chromatography, and ethyl acetate / Petroleum ether (2/1) was rinsed as an eluent, and the corresponding components were collected to obtain hexasaccharide 13 (4.11 g) with a yield of 80%. 13 (3.5 g, 1.31 mmol) was dissolved in 40 ml of a 80% aqueous acetic acid solution at 60 ° C. C was hydrolyzed under stirring, and the reaction was detected by thin layer chromatography. After the reaction was completed, the reaction solution was evaporated to dryness under reduced pressure.
- the preparation method of the hexaose according to the present invention adopts a completely new idea, that is, using 1,2: 5,6-di-0-isopropylidene glucose as a starting material.
- the preparation method is in line with the existing Compared with the preparation method, the method has the advantages of simple steps, time saving, labor saving, low cost, and mass production, etc. Therefore, the present invention provides a newest electrode for producing oligosaccharide activator hexasaccharide which is biologically active and can be used as a pesticide. Preparation method with industrial application value.
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- Organic Chemistry (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU64241/00A AU6424100A (en) | 1999-09-30 | 2000-08-07 | A method for preparation of hexasaccharide |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB991197577A CN1136223C (zh) | 1999-09-30 | 1999-09-30 | 植物自我防卫系统激活剂六糖的简易合成 |
CN99119757.7 | 1999-09-30 |
Publications (1)
Publication Number | Publication Date |
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WO2001023397A1 true WO2001023397A1 (fr) | 2001-04-05 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/CN2000/000225 WO2001023397A1 (fr) | 1999-09-30 | 2000-08-07 | Procede de preparation d'hexasaccharide |
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CN (1) | CN1136223C (zh) |
AU (1) | AU6424100A (zh) |
WO (1) | WO2001023397A1 (zh) |
Families Citing this family (1)
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CN108892740B (zh) * | 2018-06-19 | 2022-01-25 | 艾立斯特(合肥)生物科技有限公司 | 一种3,6位支化葡聚六糖的合成方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1188770A (zh) * | 1997-12-30 | 1998-07-29 | 中国科学院生态环境研究中心 | 一种以糖的原酸酯为关键中间体的区选及立体选择性合成寡糖的方法 |
CN1242372A (zh) * | 1998-07-17 | 2000-01-26 | 中国科学院生态环境研究中心 | 二糖及三糖原酸酯及其合成方法 |
CN1242371A (zh) * | 1998-07-17 | 2000-01-26 | 中国科学院生态环境研究中心 | 以三糖原酸酯为关键中间体的植物免疫系统激活剂六糖和七糖的合成方法 |
-
1999
- 1999-09-30 CN CNB991197577A patent/CN1136223C/zh not_active Expired - Fee Related
-
2000
- 2000-08-07 AU AU64241/00A patent/AU6424100A/en not_active Abandoned
- 2000-08-07 WO PCT/CN2000/000225 patent/WO2001023397A1/zh active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1188770A (zh) * | 1997-12-30 | 1998-07-29 | 中国科学院生态环境研究中心 | 一种以糖的原酸酯为关键中间体的区选及立体选择性合成寡糖的方法 |
CN1242372A (zh) * | 1998-07-17 | 2000-01-26 | 中国科学院生态环境研究中心 | 二糖及三糖原酸酯及其合成方法 |
CN1242371A (zh) * | 1998-07-17 | 2000-01-26 | 中国科学院生态环境研究中心 | 以三糖原酸酯为关键中间体的植物免疫系统激活剂六糖和七糖的合成方法 |
Non-Patent Citations (2)
Title |
---|
CARBOHYDRATE RESEARCH, vol. 315, 1999, pages 117 - 127 * |
TETRAHEDRON LETTERS, vol. 39, 1998, pages 1937 - 1940 * |
Also Published As
Publication number | Publication date |
---|---|
CN1136223C (zh) | 2004-01-28 |
CN1290706A (zh) | 2001-04-11 |
AU6424100A (en) | 2001-04-30 |
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