CN1269830C - Method for preparing-ester by using solid chlorine substitution of phosgene - Google Patents
Method for preparing-ester by using solid chlorine substitution of phosgene Download PDFInfo
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- CN1269830C CN1269830C CN 200410065846 CN200410065846A CN1269830C CN 1269830 C CN1269830 C CN 1269830C CN 200410065846 CN200410065846 CN 200410065846 CN 200410065846 A CN200410065846 A CN 200410065846A CN 1269830 C CN1269830 C CN 1269830C
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Abstract
The present invention relates to a method for preparing sucralose-6-ester by solid phosgene chlorination, particularly to a method for preparing sucralose-6-ester from bis-(trichloromethyl)-carbonate chlorinated sucrose-6-ester as solid phosgene. In the method, a chlorination technology by solid phosgene instead of phosgene or sulfoxide chloride, which is adopted, comprises: the solid phosgene is dissolved in an inert solvent and slowly dropped into a dimethyl formamide solution of sucrose-6-ester, and reaction liquid is stirred at the room temperature for 0.5 to 0.75 hour; the temperature is raised to 110 to 115DEG C within 2 to 3.5 hours, the temperature is maintained for 2 to 4 hours, the sucralose-6-ester as the product is obtained from reaction products through the steps of alkaline solution neutralization, solvent removal by distillation, dissolving with added water, active carbon decolorization, organic solvent extraction and crystallizing treatment. The inert solvent is one of benzene, toluene, dichloromethane, chloroform, carbon tetrachloride and ethyl acetate. The method for preparing sucralose-6-ester by solid phosgene chlorination has the advantages of high yield, safety, no pollution and simple operation.
Description
Technical field
The present invention relates to a kind ofly prepare the method for sucralose-6-ester, belong to the technical field of sucralose-6-ester preparation with solid phosgene [two trichloromethyl carbonate] chloro sucrose-6-ester.
Background technology
Sucralose (4,1 ', 6 '-three chloro-4,1 ', 6 '-three deoxidation sucralose) be a kind of low-yield intense sweetener, have that sugariness height, sweet taste characteristic are good, characteristics such as antagonism acid hydrolysis good stability, low heat value, nontoxic, anti-dental caries, be one of the optimal sweeting agent that can see on the present American-European market.
Sucralose is 4-, 1 ' in the sucrose molecules-and three products that hydroxyl is replaced by the chlorine atom of 6 '-position.8 hydroxyls are arranged in sucrose molecules, 3 primary hydroxyls (6-, 1 '-, 6 '-) are wherein arranged, 5 secondary hydroxyls (2-, 3-, 4-, 3 '-, 4 '-), their chemical reactivity has than big-difference, generally is the reactive behavior that the reactive behavior of primary hydroxyl is higher than secondary hydroxyl.In Sucralose is synthetic, relate to 1 ' in the chlorine atom substituting saccharose molecule-, two primary hydroxyls in 6 '-position and 4-position secondary hydroxyl, and 6-position hydroxyl must keep.Studies show that: sucrose 6-position hydroxyl has great effect for the sugariness of sucrose chlorinated derivatives, and it is absolute important for synthetic high-intensity sweetener.For these reasons; before chlorination, with the radical protection that is easy to remove (generating cane sugar-6-acetic ester) it is not chlorinated 6-position hydroxyl as adopting ethanoyl; control suitable chlorization condition then and obtain the tri-chlorination product; again hydroxyl reduction in 6-position is promptly obtained Sucralose, so just avoided the protection of all hydroxyls.
In the preparation of Sucralose, all synthetic routes all relate to the chloro step, and chloro is the key issue of synthesizing trichloro, must adopt effective chlorinating agent and chloro method.The chloro process of sucrose-6-ester adopts Vilsimier reagent usually.Vilsimier reagent is generated by reactions such as dimethyl formamide and phosgene or sulfur oxychlorides.The use sulfur oxychloride is simple and safe, but product yield is lower, and discharges a large amount of sulfur dioxide gas in the chloro, increases subsequent processes step and equipment requirements.Though use the phosgene yield very high, phosgene is a kind of hypertoxic gas, should not store and transport, phosgene also is inconvenient to accurately measure as gas simultaneously, especially needs a small amount of accurate quantitatively phosgene when the laboratory, and excessive use causes side reaction easily.
Summary of the invention
Technical problem: the object of the invention is to provide a kind of high yield, the two trichloromethyl carbonate chloros of employing safe, pollution-free, simple to operate to prepare the method for sucralose-6-ester.
Technical scheme: the present invention adopts two (trichloromethyl) carbonic ethers (being commonly called as solid phosgene) to substitute the chloro route of phosgene or sulfur oxychloride: solid phosgene is dissolved in inert solvent, slowly drop in the dimethyl formamide solution of sucrose-6-ester, keep reacting liquid temperature to be lower than 5 ℃, reaction solution at room temperature stirred 0.5-0.75 hour; Be warming up to 110-115 ℃ through 2-3.5 hour, kept 2-4 hour under this temperature.The question response product is cooled to room temperature, through the neutralization of mineral alkali or organic bases, distillation remove solvent, be dissolved in water, activated carbon decolorizing, organic solvent extraction, crystallization treatment get the product sucralose-6-ester.The present invention adopts the inert solvent of dissolved solids phosgene that benzene, toluene, methylene dichloride, chloroform, tetracol phenixin, ethyl acetate are arranged.The organic solvent that extraction is adopted is an ethyl acetate.The organic solvent of extraction is an ethyl acetate.
Solid phosgene has highly selective and chlorization activity, and the 4-, 1 ' in the chloro sucrose-6-ester molecule-and 6 '-position hydroxyl, and low, the no sulfur dioxide emissions of its toxicity effectively can thoroughly solve chloro productive rate and toxicity and the conflicting problem of pollution.
Beneficial effect: adopt alternative phosgene of two (trichloromethyl) carbonic ethers (being commonly called as solid phosgene) or sulfur oxychloride to do chlorinating agent in the technology of the present invention.At first, solid phosgene is easy to use as solid, and accurately weighing has avoided excessive use to produce side reaction; Secondly, be compared to the use sulfur oxychloride, the chloro yield height of solid phosgene; The 3rd, solid phosgene discharges carbonic acid gas in chloro, rather than sulfur dioxide gas, and is pollution-free, reduced off gas treatment step and the equipment requirements in the technology.
Embodiment
Further specify the present invention by the following examples:
HPLC (high performance liquid chromatography) analysis condition: instrument, Agilent 1100series; Chromatographic column, ALLTIMA C18,5MICRON, 250mm * 4.6mm; Column temperature, 40 ℃; Detector, DAD; Moving phase, acetonitrile/water (15/85); Sample size, 10 μ L.
Embodiment 1:10 gram cane sugar-6-acetic ester is dissolved in 90 milliliters of dimethyl formamides, and at-10 ℃ of toluene solutions (containing solid phosgene 25 grams) that slowly drip solid phosgene, reaction mixture keeps below 5 ℃, vigorous stirring 0.5 hour.Be warming up to 115 ℃ through 2.5 hours again, kept 4 hours.The question response product is cooled to room temperature, through the neutralization of mineral alkali or organic bases, distillation remove solvent, be dissolved in water, activated carbon decolorizing, organic extractant phase (organic solvent of extraction is an ethyl acetate), crystallization, obtain the sucralose-6-ester product, product is analyzed by HPLC and is shown that the sucralose-6-ester productive rate is 62.2%.
Embodiment 2:8 gram cane sugar-6-acetic ester is dissolved in 70 milliliters of dimethyl formamides, and cryosel is bathed the dichloromethane solution (containing solid phosgene 18 grams) that drips solid phosgene down.Reaction mixture keeps below 5 ℃, vigorous stirring 0.5 hour.Be warming up to 115 ℃ through 3.5 hours again, kept 4 hours.Water trap is collected the methylene dichloride of condensation.Treat after the reaction that product is cooled to room temperature, through the neutralization of mineral alkali or organic bases, distillation remove solvent, be dissolved in water, activated carbon decolorizing, organic solvent extraction (organic solvent of extraction is an ethyl acetate), crystallization, obtain the sucralose-6-ester product, HPLC shows that the sucralose-6-ester productive rate is 58.3%.
Embodiment 3:5 gram cane sugar-6-acetic ester is dissolved in 60 milliliters of dimethyl formamides ,-10 ℃ of carbon tetrachloride solutions (containing solid phosgene 10 grams) that drip solid phosgene down.Reaction mixture keeps below 5 ℃, vigorous stirring 0.5 hour.Be warming up to 113 ℃ through 3.5 hours again, kept 3 hours.The reaction after product is cooled to room temperature, through alkaline solution neutralization, distillation remove solvent, be dissolved in water, activated carbon decolorizing, organic solvent extraction (organic solvent of extraction is an ethyl acetate), crystallization, obtain the sucralose-6-ester product, HPLC shows that the sucralose-6-ester productive rate is 56.7%.
Claims (3)
1, a kind of method that adopts pair trichloromethyl carbonate chlorinations to prepare sucralose-6-ester, it is characterized in that this method adopts two trichloromethyl carbonates to substitute the chloridization process of phosgene or sulfur oxychloride: two trichloromethyl carbonates are dissolved in the inert solvent, reaction mixture keeps below under 5 ℃ the condition, slowly drops in the dimethyl formamide solution of sucrose-6-ester; Then reaction solution was at room temperature stirred 0.5-0.75 hour; Be warming up to 110-115 ℃ through 2-3.5 hour, kept under this temperature 2-4 hour, reaction product through alkaline solution neutralization, distillation remove solvent, be dissolved in water, activated carbon decolorizing, organic solvent extraction, crystallization treatment step get the product sucralose-6-ester.
2, the two trichloromethyl carbonate chlorinations of employing according to claim 1 prepare the method for sucralose-6-ester, it is characterized in that inert solvent is a kind of in benzene, toluene, methylene dichloride, chloroform, tetracol phenixin, the ethyl acetate.
3, the two trichloromethyl carbonate chlorinations of employing according to claim 1 prepare the method for sucralose-6-ester, it is characterized in that the organic solvent that extracts is an ethyl acetate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200410065846 CN1269830C (en) | 2004-12-22 | 2004-12-22 | Method for preparing-ester by using solid chlorine substitution of phosgene |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410065846 CN1269830C (en) | 2004-12-22 | 2004-12-22 | Method for preparing-ester by using solid chlorine substitution of phosgene |
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| CN1660868A CN1660868A (en) | 2005-08-31 |
| CN1269830C true CN1269830C (en) | 2006-08-16 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402541C (en) * | 2006-06-15 | 2008-07-16 | 浙江工业大学 | Synthesis of trichloro-cane-6-ethyl ester |
| CN100593534C (en) * | 2007-09-30 | 2010-03-10 | 浙江工业大学 | Chemical method for synthesizing 6,8-dichloro ethyl cacodylic acid caprylate |
| CN101177437B (en) * | 2007-12-07 | 2010-10-27 | 浙江普洛医药科技有限公司 | Method for synthesizing environment-friendly sucralose |
| CN103145772A (en) * | 2013-03-26 | 2013-06-12 | 山东金城柯瑞化学有限公司 | Preparation method of sucralose |
| CN106589013B (en) * | 2016-11-11 | 2019-06-04 | 浙江新和成股份有限公司 | A method of sucralose-6-acetic ester is prepared in liquid-liquid diphase system |
| CN108203452B (en) * | 2018-01-24 | 2021-04-06 | 山东康宝生化科技有限公司 | Method for synthesizing sucralose-6-ethyl ester |
| CN110563780B (en) * | 2019-08-30 | 2020-08-14 | 山东新和成精化科技有限公司 | Post-treatment method of sucralose chlorination liquid and application of sucralose chlorination liquid in preparation of sucralose |
| CN111517922B (en) * | 2020-04-28 | 2022-11-04 | 万华化学集团股份有限公司 | Method for preparing 4-chloro-3,5-dimethylphenol |
| CN112175022B (en) * | 2020-09-25 | 2022-02-18 | 万华化学集团股份有限公司 | Method for preparing sucralose-6-acetate by adopting microchannel reactor |
| CN112996798A (en) * | 2020-12-28 | 2021-06-18 | 安徽金禾实业股份有限公司 | Chlorination method of sucrose-6-carboxylate |
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Assignee: JK Sucralose Inc. Assignor: Southeast University Contract fulfillment period: 2009.2.26 to 2014.2.25 contract change Contract record no.: 2009320000954 Denomination of invention: Method for preparing-ester by using solid chlorine substitution of phosgene Granted publication date: 20060816 License type: Exclusive license Record date: 2009.5.18 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.2.26 TO 2014.2.25; CHANGE OF CONTRACT Name of requester: JK SUCRALOSE INC Effective date: 20090518 |
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Owner name: YANCHENG JK SUCRALOSE INC. Free format text: FORMER OWNER: SOWTHEAST UNIV. Effective date: 20101231 |
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Free format text: CORRECT: ADDRESS; FROM: 210096 NO.2, SIPAILOU, NANJING CITY, JIANGSU PROVINCE TO: 224300 NO.118, RENMIN EAST ROAD, ECONOMIC DEVELOPMENT ZONE, SHEYANG, JIANGSU PROVINCE |
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Effective date of registration: 20101231 Address after: 224300 No. 118 East Renmin Road, Sheyang Economic Development Zone, Jiangsu Patentee after: JK Sucralose Inc. Address before: 210096 Jiangsu city Nanjing Province four pailou No. 2 Patentee before: Southeast University |