Preparation method of 2-methyl-1-(4-substituted phenyl)-2-morpholinyl-1-acetone

A morpholino and morpholine technology, applied in the field of organic synthesis, can solve the problems of high operation cost, poor purification, complicated process and the like, and achieve the effect of low operation risk

Pending Publication Date: 2021-03-26
湖南久日新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Regarding the synthetic method of ultraviolet photoinitiator 907, CN101633647A discloses a method for synthesizing α-aminoaryl alkyl ketones with high selectivity and high yield. The synthetic method consists of Friedel-Crafts reaction, bromination reaction, epoxidation Reaction and amine substitution ring-opening reaction composition, and add catalyst when epoxide reacts with organic amine, described catalyst is obtained with any one or more in montmorillonite, kaolin, clay, bentonite or white clay; The synthesis method has the problem of difficult separation of the catalyst after the subsequent ring-opening reaction, high operating costs, and the product produced by the reaction is dark in color, and 5-10% activated carbon is required for decolorization
[0005] CN102659717A discloses a synthetic method of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-acetone, in which the ring-opening process is acidified with hydrochloric acid to obtain 1-(4-chloro Phenyl)-2-methyl-2-morpholinyl-1-propanol hydrochloride, followed by oxidation and substitution to obtain the target product 2-methyl-1-(4-methylthiophenyl)-2 -Morpholinyl-1-acetone; this synthetic method increases the oxidation step, the process is complicated, and the cost is high
CN110563671A discloses a kind of preparation method of photoinitiator 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-acetone, it comprises Friedel-Crafts acylation reaction, chlorination, ring Oxidation, morpholino substitution, methylthio substitution, and refining steps; 30% liquid caustic soda is added as a catalyst in the morpholine substitution reaction. In addition to the risk of strong corrosion during operation, more importantly, it is in contact with epoxy During the nucleophilic reaction process of the intermediate, there are a large number of hydroxide anions in the high-concentration liquid caustic soda, and there is a strong competitive relationship with the substitution reaction of morphine. At the same time, the strong alkalinity of the reaction system also increases the possibility of elimination reaction. The elimination product will further react with morphine, resulting in poor product purity and difficult purification

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  • Preparation method of 2-methyl-1-(4-substituted phenyl)-2-morpholinyl-1-acetone

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Embodiment 1

[0075] This embodiment provides a preparation method of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, which specifically includes the following steps:

[0076] (a) add 2000L methyl alcohol, 535kg morpholine and 710kg sodium methylate in reactor, obtain the mixed solution of methyl alcohol, morpholine and sodium methylate; Cool down to temperature and be 28 ℃, slowly drop 1000kg bromide in above-mentioned mixed solution, After the dropwise addition, the temperature was controlled at 28°C for 0.5h; then under normal pressure, the temperature was raised to 85°C for methanol distillation; the molecular formula of the bromide was as follows:

[0077]

[0078] (b) add 1450kg morpholine, 140kg water in the reactor of step (a); Insulation 105 ℃ of reaction 12h;

[0079] (c) The product in step (b) is distilled morpholine under reduced pressure at a vacuum pressure of -0.05MPa and a temperature of 100°C; then add 3000L of toluene, wash twice with 350L of water, and separ...

Embodiment 2

[0085] The difference between this embodiment and Example 1 is that in step (b), 140kg of water is replaced with 50L concentration of sodium carbonate aqueous solution of 0.1mol / L, and other parameters and conditions are exactly the same as in Example 1.

[0086]Purity test was carried out on the above product, the product purity was 99.0%, and the yield was 90%.

Embodiment 3

[0088] The difference between this embodiment and Example 1 is that in step (b), 140kg of water is replaced with 30L concentration of sodium bicarbonate aqueous solution of 0.1mol / L, and other parameters and conditions are exactly the same as in Example 1.

[0089] Purity test was carried out on the above product, the product purity was 99.1%, and the yield was 91%.

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Abstract

The invention relates to a preparation method of 2-methyl-1-(4-substituted phenyl)-2-morpholinyl-1-acetone. The preparation method comprises two steps of epoxidation reaction and morpholine substitution reaction, wherein in the morpholine substitution reaction, a proper amount of an auxiliary agent is added, and the auxiliary agent is selected from at least one of water, a strong-acid weak-alkalisaline solution and a strong-alkali weak-acid saline solution, so that the ring opening rate and the ring opening selectivity in the morpholine substitution reaction process can be obviously improved,and the overall reaction rate and yield are further improved, according to the method, the problem that subsequent catalysts are difficult to filter, recycle and purify due to the fact that catalystssuch as carclazyte need to be added in the traditional process is solved, the high-purity 2-methyl-1-(4-substituted phenyl)-2-morpholinyl-1-acetone can be obtained more easily, the process cost and the aftertreatment operation risk are reduced, and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and relates to a preparation method of 2-methyl-1-(4-substituted phenyl)-2-morpholino-1-propanone, in particular to a high-purity 2-methyl-1-propanone The preparation method of 1-(4-substituted phenyl)-2-morpholino-1-propanone. Background technique [0002] 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (ultraviolet photoinitiator 907) can absorb ultraviolet radiation energy to form free radicals or Cationic, triggering the polymerization, crosslinking and grafting reactions of monomers and oligomers, and curing the ink into a three-dimensional network structure polymer in a short time; the molecular structure of UV photoinitiator 907 is as follows : [0003] [0004] Regarding the synthetic method of ultraviolet photoinitiator 907, CN101633647A discloses a method for synthesizing α-aminoaryl alkyl ketones with high selectivity and high yield. The synthetic method consists of Fried...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D295/104
CPCC07D295/104
Inventor 赵国锋张齐毛桂红王涛
Owner 湖南久日新材料有限公司
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