KR20200132479A - Manufacturing method for 3-(2-chloropropionylamino)propionic acid alkyl ester - Google Patents

Abstract

The present invention relates to a method for manufacturing 3-(2-chloropropionylamino)propionic acid alkyl ester. The manufacturing method of the present invention is a method of using an alkyl acrylate as a reaction starting material, unlike conventional methods of using β-alanine. Since β-alanine is not used, the purchase cost of raw materials is reduced, and manufacturing processes are reduced because a process of making β-alanine methyl ester hydrochloride into free β-alanine methyl ester is not required. The method is also useful because 3-(2-chloropropionylamino)propionic acid alkyl ester, which is an intermediate of uracil-based compounds useful as herbicides, can be obtained in high yield and high purity.

Description

3-(2-chloropropionylamino)propionic acid alkyl ester manufacturing method {Manufacturing method for 3-(2-chloropropionylamino)propionic acid alkyl ester}

The present invention relates to a method of preparing 3-(2-chloropropionylamino)propionic acid alkyl ester.

In crop cultivation, it is important to control weeds and protect crops, which impede the growth of crops. Herbicides used for controlling weeds have high herbicidal activity and broad herbicidal spectrum, but are required to be safe for the environment and crops.

As conventionally used herbicides, triazine herbicides such as atrazine and anilide herbicides such as Alachlor or Metolachlor have been used in corn cultivation, and non-selective herbicides include Paraquat or Herbicides such as glyphosate have been used. However, there are still many weeds that cause losses in agriculture, and the research and development of new herbicides continues.

It has been reported that uracil compounds do not harm useful crops such as wheat and corn, show selective herbicidal effect against broad leaves, flowers, and weeds, and are suitable herbicides for use in crop fields, orchards, and non-farm lands. No. 10-1103840, Korean Patent No. 10-1402876, Korean Patent No. 10-1686860).

Meanwhile, 3-(2-chloropropionylamino)propionic acid alkyl ester is an intermediate of a uracil-based compound useful as a herbicide, and registered in Korea as a conventional document related to a method of preparing 3-(2-chloropropionylamino)propionic acid alkyl ester. Patent No. 10-1103840 describes a method of preparing 3-(2-chloropropionylamino)propionic acid methyl ester by adding 2-chloropropionyl chloride to β-alanine methyl ester hydrochloride, and International Publication No. 2014176279 And in the preceding paper [Cummings, C. et al., Biomacromolecules, 15(3), 763-771, 2014], N-2-chloropropionyl-β-alanine was added to β-alanine by adding 2-chloropropionyl chloride. A method of making is described.

Therefore, the present inventors use methyl acrylate as a starting material, unlike the conventional method for preparing 3-(2-chloropropionylamino)propionic acid methyl ester using β-alanine. ) By producing the propionic acid methyl ester, the manufacturing cost is significantly reduced compared to the conventional method, and the process of making methyl ester hydrochloride into free β-alanine methyl ester is not required, thus reducing the manufacturing process, and can be manufactured with high yield and high purity. The present invention could be completed by confirming that there is a method.

Korean Patent Registration No. 10-1103840 (Uracil-based compound and herbicide containing the same, registered on January 02, 2012) Korean Patent Registration No. 10-1402876 (herbicidal uracil-based compound and herbicide containing the same, registered on May 27, 2014) Korean Patent Registration No. 10-1686860 (herbicidal composition containing uracil compound as an active ingredient, registered on December 09, 2016) International Publication No. 2014176279 (POLYMER-BASED PROTEIN ENGINEERING METHODS TO RATIONALLY TUNE ENZYME ACTIVITY, PH-DEPENDENCE AND STABILITY, published on April 22, 2014)

Cummings, C. et al., Dramatically increased pH and temperature stability of chymotrypsin using dual block polymer-based protein engineering, Biomacromolecules, 15(3), 763-771, 2014. Li, J. et al., A convenient synthesis of amino acid methyl esters, Molecules, 13(5), 1111-1119, 2008.

The present invention is to provide a method for preparing 3-(2-chloropropionylamino)propionic acid alkyl ester from alkyl acrylate.

The present invention relates to a method for preparing 3-(2-chloropropionylamino)propionic acid alkyl ester,

(Step 1) adding alkyl acrylate to a 10-15% ammonia ethanol solution, reacting, removing the solvent, adding water and ethyl acetate, taking only the organic layer, and then concentrating; And

(Step 2) adding methylene chloride and triethylamine to the concentrate in Step 1, cooling to 0°C, adding 2-chloropropionyl chloride, and reacting at room temperature for 20 to 30 hours; Includes.

[Formula 1]

Alkyl in the first step is a single bonded linear or branched hydrocarbon group, preferably selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl and tertiary butyl.

The base used in the first step may be an inorganic base such as tertiary amines or sodium carbonate, and is not particularly limited, but it is preferable to use a 10 to 15% ammonia ethanol solution.

The 10 to 15% ammonia ethanol solution and alkyl acrylate in the first step are used in a molar ratio of 1:1 to 1.5, but if the amount is exceeded, the reaction is not sufficiently performed or by-products are generated, resulting in 3-(2-chloro The yield and purity of propionylamino)propionic acid alkyl ester are low, which is not preferable.

A method of extracting only the organic layer by adding water and ethyl acetate in the first step is not particularly limited, and a method in which a known method used for extraction may be used alone or in an appropriate combination may be used.

The solvent used in the second step is not particularly limited except for alcohols reactive with 2-chloropropionyl chloride, but methylene chloride is preferably used.

The methylene chloride in the second step is added in an amount of 100 to 1000 parts by weight based on 100 parts by weight of the concentrate in the first step. In addition, 0.5 to 1.5 moles of triethylamine and 2-chloropropionyl chloride are added, respectively, based on 1 mole of the alkyl acrylate in the first step. However, when methylene chloride, triethylamine and 2-chloropropionyl chloride are added outside the weight part and molar ratio, the reaction is not sufficiently performed or a by-product is generated, which is not preferable.

When the reaction is terminated by the method of the present invention, a pure compound represented by Formula 1 may be obtained using a conventional separation or purification method such as chromatography, but is not particularly limited.

The present invention relates to a method for preparing 3-(2-chloropropionylamino)propionic acid alkyl ester. The manufacturing method of the present invention uses an alkyl acrylate different from the conventional β-alanine as a reaction starting material, and does not use β-alanine, thereby reducing the cost of purchasing raw materials and freeing β-alanine methyl ester hydrochloride. -It is useful to obtain 3-(2-chloropropionylamino)propionic acid alkyl ester, an intermediate of uracil-based compounds useful as herbicides, in high yield and high purity, while the manufacturing process is reduced as the process of making alanine methyl ester is not required. .

Hereinafter, a preferred embodiment of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the content introduced herein becomes thorough and complete, and is provided to sufficiently convey the spirit of the present invention to those skilled in the art.

<Example 1. Preparation of 3-(2-chloropropionylamino)propionic acid methyl ester>

3-(2-chloropropionylamino)propionic acid methyl ester was prepared with reference to Scheme 1 below.

[Scheme 1]

To 6.5 g of a 13% ammonia ethanol solution at room temperature, 5.2 g (60 mmol) of methyl acrylate was added and stirred. After the reaction was completed by tracking the reaction by GC, the solvent was removed with a vacuum concentrator, and 25 ml of water and 20 ml of ethyl acetate (repeated 3 times) were added to take only the organic layer. The organic layer was washed with 20 ml of water and 20 ml of saturated salt water, dried over magnesium sulfate, and concentrated in a vacuum concentrator. To this, methylenecloid 20g and triethylamine 5.5g (55mmol) were added thereto, then cooled to 0°C, 2-chloropropionyl chloride 6.3g (50mmol) was slowly added thereto, and the mixture was stirred at room temperature for 24 hours. . When the reaction was completed, the solvent was removed with a vacuum concentrator, and a brown oil-like 3-(2-chloropropionylamino)propionic acid methyl ester (yield 95%, purity 99%) was obtained.

<Example 2. Preparation of 3-(2-chloropropionylamino)propionic acid ethyl ester>

It was prepared as in Example 1, but 3-(2-chloropropionylamino)propionic acid ethyl ester was prepared using ethyl acrylate instead of methyl acrylate.

<Example 3. Preparation of 3-(2-chloropropionylamino)propionic acid propyl ester>

It was prepared as in Example 1, but 3-(2-chloropropionylamino)propionic acid propyl ester was prepared using propyl acrylate instead of methyl acrylate.

<Example 4. Preparation of 3-(2-chloropropionylamino)propionic acid butyl ester>

It was prepared as in Example 1, but 3-(2-chloropropionylamino)propionic acid butyl ester was prepared using butyl acrylate instead of methyl acrylate.

<Comparative Example 1. Preparation of 3-(2-chloropropionylamino)propionic acid methyl ester to be compared>

Preparation of β-alanine methyl ester hydrochloride from β-alanine with reference to the preceding paper [Li, J. et al., Molecules, 13(5), 1111-1119, 2008], and then a prior patent (Korean Patent No. 10 -1103840), 3-(2-chloropropionylamino)propionic acid methyl ester was prepared.

<Experimental Example 1. Process comparison of 3-(2-chloropropionylamino)propionic acid alkyl ester>

Table 1 shows a comparison of the reaction processes of 3-(2-chloropropionylamino)propionic acid methyl ester prepared from the above Examples and Comparative Examples.

Example 1 Comparative Example 1 Reaction process Step 1 The process of stirring the reaction product (methyl acrylate and 10-15% ammonia ethanol solution), then removing and concentrating the solvent Process of stirring the reactants (β-alanine, methanol and hydrochloric acid) to make β-alanine methyl ester hydrochloride 2nd process Process of adding methylene chloride, triethylamine and 2-chloropropionyl chloride to obtain 3-(2-chloropropionylamino)propionic acid methyl ester Process of making β-alanine methyl ester hydrochloride in step 1 into free β-alanine methyl ester 3 process × 2-chloropropionyl chloride is added and 3-(2-chloropropionyl
Process of obtaining amino)propionic acid methyl ester Reaction by-product (waste)
Creation × ○

As shown in Table 1 above, in Example 1 of the present invention, unlike Comparative Example 1 corresponding to the prior literature, the process of making free β-alanine methyl ester was not required, so the manufacturing process was reduced, and reaction by-products (wastes) were generated. It was found that it was an eco-friendly manufacturing method.

In addition, in terms of manufacturing cost, if methyl acrylate is used instead of β-alanine as a reaction starting material as in Example 1 of the present invention, the purchase cost of raw materials can be reduced by more than 5 times, the process is reduced, and the cost is reduced, and waste treatment. It was found that the manufacturing cost required to obtain 3-(2-chloropropionylamino)propionic acid alkyl ester was reduced by 5 to 10 times compared to Comparative Example 1 because no cost occurred.

Accordingly, as in the present invention, 3-(2-chloropropionylamino)propionic acid alkyl ester is an intermediate of uracil-based compounds useful as herbicides, 3-(2- It was found that the chloropropionylamino)propionic acid alkyl ester can be obtained in high yield and high purity, while manufacturing cost and process are reduced, and it is an eco-friendly method.

Claims (6)

(Step 1) adding alkyl acrylate to a 10-15% ammonia ethanol solution, reacting, removing the solvent, adding water and ethyl acetate, taking only the organic layer, and then concentrating; And
(Step 2) adding methylene chloride and triethylamine to the concentrate in Step 1, cooling to 0°C, adding 2-chloropropionyl chloride, and reacting at room temperature for 20 to 30 hours;
Method for producing 3-(2-chloropropionylamino)propionic acid alkyl ester comprising a.
[Formula 1]

The method of claim 1,
In the first step, the alkyl is selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl, and tertiary butyl. Preparation of 3-(2-chloropropionylamino)propionic acid alkyl ester Way. The method of claim 1,
The method for producing 3-(2-chloropropionylamino)propionic acid alkyl ester, characterized in that the 10-15% ammonia ethanol solution and the alkyl acrylate in the first step are added in a molar ratio of 1:1 to 1.5. The method of claim 1,
Method for producing 3-(2-chloropropionylamino)propionic acid alkyl ester, characterized in that the methylene chloride of the second step is added 100 to 1000 parts by weight based on 100 parts by weight of the concentrate of the first step. The method of claim 1,
The method for producing 3-(2-chloropropionylamino)propionic acid alkyl ester, characterized in that 0.5 to 1.5 mol of triethylamine in the second step is added based on 1 mol of the alkyl acrylate in the first step. The method of claim 1,
The method for producing 3-(2-chloropropionylamino)propionic acid alkyl ester, characterized in that 0.5 to 1.5 mol of 2-chloropropionyl chloride in the second step is added based on 1 mol of the alkyl acrylate in the first step.