CN1446802A - Chemosynthesis method of 1-chloroformyl-3-acetyl-2-imidazolidinone - Google Patents

Chemosynthesis method of 1-chloroformyl-3-acetyl-2-imidazolidinone Download PDF

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CN1446802A
CN1446802A CN 02107658 CN02107658A CN1446802A CN 1446802 A CN1446802 A CN 1446802A CN 02107658 CN02107658 CN 02107658 CN 02107658 A CN02107658 A CN 02107658A CN 1446802 A CN1446802 A CN 1446802A
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imidazolidone
chloroformyl
ethanoyl
trichloromethyl
chemical synthesis
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CN 02107658
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Chinese (zh)
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苏为科
梁现蕊
李永曙
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

1-氯甲酰基-3-乙酰基-2-咪唑烷酮的化学合成方法,以有机碱为捕酸剂,以2-咪唑烷酮、乙酰氯或乙酸酐、双(三氯甲基)碳酸酯为原料在有机溶剂中反应制得,该产品是新型半合成抗菌素的重要中间体。该合成方法是一种工艺先进合理、生产安全可靠、反应收率高、生产成本低、基本无三废的1-氯甲酰基-3-乙酰基-2-咪唑烷酮化学合成方法。The chemical synthesis method of 1-chloroformyl-3-acetyl-2-imidazolidinone uses an organic base as an acid scavenger, and 2-imidazolidinone, acetyl chloride or acetic anhydride, bis(trichloromethyl)carbonic acid The ester is prepared by reacting in an organic solvent as a raw material, and the product is an important intermediate of a new type of semi-synthetic antibiotic. The synthesis method is a chemical synthesis method of 1-chloroformyl-3-acetyl-2-imidazolidinone with advanced and reasonable technology, safe and reliable production, high reaction yield, low production cost and basically no three wastes.

Description

The chemical synthesis process of 1-chloroformyl-3-ethanoyl-2-imidazolidone
The present invention relates to a kind of is the earlier synthetic 1-ethanoyl of raw material-2-imidazolidone with Acetyl Chloride 98Min. or diacetyl oxide and 2-imidazolidone; use two (trichloromethyl) carbonic ethers to substitute phosgene directly and the chemical synthesis process of 1-ethanoyl-2-imidazolidone prepared in reaction 1-chloroformyl-3-ethanoyl-2-imidazolidone then, 1-chloroformyl-3-ethanoyl-2-imidazolidone is the important intermediate of new semi-synthetic antibiotic.
Before the present invention made, the chemical synthesis process of prior art 1-chloroformyl-3-ethanoyl-2-imidazolidone was to be that raw material reaction makes with phosgene or trichloromethylchloroformate and 1-ethanoyl-2-imidazolidone.Propose as Germany Beyer Co., Ltd (Brit, 1392850), 1-ethanoyl-2-imidazolidone in anhydrous benzene with trimethylchlorosilane and triethylamine back flow reaction 18 hours, then with phosgene at 5 ℃ of reactions and getting down, product M.P.104 ℃, productive rate 81%.Its shortcoming is to use hypertoxic raw material phosgene and source of goods difficulty and the expensive trimethylchlorosilane that restriction is in the world used, and reaction time is long, and potential safety hazard is big, and reaction yield is low, the production cost height, and quantity of three wastes is big, difficult, the industrialization difficulty.
Task of the present invention is the shortcoming that overcomes prior art, provides that a kind of technology is reasonable, production safety is reliable, reaction yield is high, production cost is low, does not have the 1-chloroformyl-3-ethanoyl-2-imidazolidone chemical synthesis process of the three wastes substantially.
The chemical synthesis process of 1-chloroformyl-3-ethanoyl-2-imidazolidone, it is characterized in that with the organic bases being acid-capture agent, with Acetyl Chloride 98Min. or diacetyl oxide and 2-imidazolidone is that raw material reacts in organic solvent, and then make with two (trichloromethyl) carbonate reaction, its molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min. or diacetyl oxide: organic bases: two (trichloromethyl) carbonic ether=1: 1.0-1.5: 1.0-1.5: 0.27-0.50; The mass ratio of 2-imidazolidone and solvent is 1: 8-15, and its temperature of reaction is 0~70 ℃, and the reaction times is 5~10 hours, and its reaction equation is:
Organic solvent can be tetrahydrofuran (THF) or benzene or toluene or dimethylbenzene or chlorobenzene or dichlorobenzene or methylene dichloride or trichloromethane or tetracol phenixin or ethylene dichloride benzene.
Organic bases can be pyridine or triethylamine or N, dinethylformamide.
The present invention compared with prior art, the operational path advanced person, processing condition are reasonable, used raw material has been avoided hypertoxic phosgene, production safety is reliable, the reaction yield height, production cost is lower, does not have the three wastes substantially, has bigger implementary value and economic results in society.
Embodiment 1
Molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min.: pyridine: two (trichloromethyl) carbonic ether=1: 1.1: 1.1: 0.293
In the 500mL four-hole boiling flask of mechanical stirring, constant pressure funnel, reflux condensing tube and thermometer is housed, add 0.5mol 2-imidazolidone and 150mL anhydrous tetrahydro furan, open and stir, under vigorous stirring, be cooled to 0 ℃, slowly drip the 0.55mol Acetyl Chloride 98Min. then, drip 70min approximately, finish and be warming up to 25 ℃, stirred 3 hours down, after reaction finishes at 20-30 ℃, tetrahydrofuran (THF) is reclaimed in vacuum distilling, resistates acetone recrystallization, vacuum-drying get elaboration 51.2g, yield 80%, fusing point 187.2-188.3 ℃, HPLC content 99.3%.
Mechanical stirring is being housed; constant pressure funnel; in the 500mL four-hole boiling flask of reflux condensing tube and thermometer; add 51.2gN-ethanoyl-2-imidazolidone; 39.2g pyridine and 250mL anhydrous tetrahydro furan; open and stir; under vigorous stirring, slowly drip solution and the organic bases (pyridine) prepared by two (trichloromethyl) carbonic ethers of 43.7g and 100mL anhydrous tetrahydro furan in advance; finish temperature rising reflux 3~5h; reaction finishes the final vacuum distillation and reclaims methylene dichloride; the resistates acetone recrystallization; vacuum-drying gets elaboration 68.6g; yield 90%; fusing point 104.0-104.5 ℃, HPLC content 99.7%.
Embodiment 2
Molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min.: pyridine: two (trichloromethyl) carbonic ether=1: 1.3: 1.3: 0.293
In the 500mL four-hole boiling flask of mechanical stirring, constant pressure funnel, reflux condensing tube and thermometer is housed, add 0.5mol 2-imidazolidone and 150mL anhydrous tetrahydro furan, open and stir, under vigorous stirring, be cooled to 0 ℃, slowly drip the 0.65mol Acetyl Chloride 98Min. then, drip 80min approximately, finish and be warming up to 25 ℃, stirred 4 hours down at 20-30 ℃, after reaction finished, tetrahydrofuran (THF) was reclaimed in vacuum distilling, the resistates acetone recrystallization, vacuum-drying gets elaboration 52.5g, and yield 82% fusing point 187.0-188.2 ℃, HPLC content 99.2%.
Mechanical stirring is being housed; constant pressure funnel; in the 500mL four-hole boiling flask of reflux condensing tube and thermometer; add 52.5g N-ethanoyl-2-imidazolidone; 51.3g pyridine and 250mL anhydrous tetrahydro furan; open and stir; under vigorous stirring, slowly drip solution and the organic bases (pyridine) prepared by two (trichloromethyl) carbonic ethers of 44.8g and 100mL anhydrous tetrahydro furan in advance; finish temperature rising reflux 3~5h; reaction finishes the final vacuum distillation and reclaims methylene dichloride; the resistates acetone recrystallization; vacuum-drying gets elaboration 71.1g; yield 91% fusing point 103.5-104.0 ℃, HPLC content 99.3%.
Embodiment 3
Molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min.: pyridine: two (trichloromethyl) carbonic ether=1: 1.5: 1.5: 0.293
Operating process is with embodiment 2.The yield 84% of N-ethanoyl-2-imidazolidone, fusing point 186.5-188.0 ℃, HPLC content 98.6%.The yield 92% of 1-chloroformyl-3-ethanoyl-2-imidazolidone, fusing point 103.8-104.2 ℃, HPLC content 99.5%.
Embodiment 4
Molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min.: pyridine: two (trichloromethyl) carbonic ether=1: 1.3: 1.3: 0.35
Operating process is with embodiment 2.The yield 82% of N-ethanoyl-2-imidazolidone, fusing point 187.0-188.2 ℃, HPLC content 99.2%.The yield 93% fusing point 104.1-104.8 of 1-chloroformyl-3-ethanoyl-2-imidazolidone ℃, HPLC content 99.7%.
Embodiment 5
Molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min.: pyridine: two (trichloromethyl) carbonic ether=1: 1.3: 1.3: 0.45
Operating process is with embodiment 2.The yield 82% of N-ethanoyl-2-imidazolidone, fusing point 187.0-188.2 ℃, HPLC content 99.2%.The yield 90% of 1-chloroformyl-3-ethanoyl-2-imidazolidone, fusing point 103.3-104.6 ℃, HPLC content 99.1%.
Embodiment 6
Molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min.: pyridine: two (trichloromethyl) carbonic ether=1: 1.3: 1.5: 0.45
Operating process is with embodiment 2.The yield 82% of N-ethanoyl-2-imidazolidone, fusing point 187.0-188.2 ℃, HPLC content 99.2%.The yield 92.5% of 1-chloroformyl-3-ethanoyl-2-imidazolidone, fusing point 103.6-104.6 ℃, HPLC content 99.5%.
Embodiment 7
Molar ratio is the 2-imidazolidone: diacetyl oxide: pyridine: two (trichloromethyl) carbonic ether=1: 1.3: 1.3: 0.35
Mechanical stirring is being housed; constant pressure funnel; in the 500mL four-hole boiling flask of reflux condensing tube and thermometer; add 0.5mol 2-imidazolidone and 150mL anhydrous tetrahydro furan; open and stir; under vigorous stirring, be cooled to 0 ℃; slowly drip the 0.65mol diacetyl oxide then; drip 80min approximately; finish and be warming up to 25 ℃, stirred 4 hours down, after reaction finishes at 20-30 ℃; tetrahydrofuran (THF) and acetate are reclaimed in vacuum distilling; resistates acetone recrystallization, vacuum-drying get N-ethanoyl-2-imidazolidone, yield 80%; fusing point 187.1-188.7 ℃, HPLC content 99.0%.
The synthetic operation of 1-chloroformyl-3-ethanoyl-2-imidazolidone is identical with embodiment 2, yield 92.5%, fusing point 103.8-104.5 ℃, HPLC content 99.6%.
The patent of the present invention and Beyer Co., Ltd (Brit.1392850) relatively has production safety, and is easy to operate, and reaction time is short, and raw material is cheap and easy to get, the reaction yield height, and advantages such as good product quality are one and are suitable for industrialized method.

Claims (3)

1, the chemical synthesis process of 1-chloroformyl-3-ethanoyl-2-imidazolidone, it is characterized in that with the organic bases being acid-capture agent, with Acetyl Chloride 98Min. or diacetyl oxide and 2-imidazolidone is that raw material reacts in organic solvent, and then make with two (trichloromethyl) carbonate reaction, its molar ratio is the 2-imidazolidone: Acetyl Chloride 98Min. or diacetyl oxide: organic bases: two (trichloromethyl) carbonic ether=1: 1.0-1.5: 1.0-1.5: 0.27-0.50; The mass ratio of 2-imidazolidone and solvent is 1: 8-15, and its temperature of reaction is 0~70 ℃, the reaction times is 5~10 hours.
2, chemical synthesis process as claimed in claim 1 is characterized in that organic solvent can be tetrahydrofuran (THF) or benzene or toluene or dimethylbenzene or chlorobenzene or dichlorobenzene or methylene dichloride or trichloromethane or tetracol phenixin or ethylene dichloride.
3, chemical synthesis process as claimed in claim 1 is characterized in that organic bases can be pyridine or triethylamine or N, dinethylformamide.
CN 02107658 2002-03-22 2002-03-22 Chemosynthesis method of 1-chloroformyl-3-acetyl-2-imidazolidinone Pending CN1446802A (en)

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