KR100638471B1 - Novel process for the preparation of cilastatin sodium salt - Google Patents

Abstract

The present invention relates to a novel process for preparing the cilastatin sodium salt which is widely used as an adjuvant of imipenem.

The preparation method of the present invention inhibits the formation of the E isomer of ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid salt, which is an intermediate of the cilastatin sodium salt, and reacts. By separating and purifying with ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid salt directly in the liquid phase, a high yield and high purity can be obtained in a simplified process. Cilastatin is a novel preparation method that can separate and purify in the form of a cilastatin amine salt to produce a compound of the cilastatin sodium salt in high purity using sodium hydroxide and a cation exchange resin.

Cilastatin Sodium Salt, Cilastatin Amine Salt, Manufacturing Method, Isomers

Description

Novel process for the preparation of cilastatin sodium salt

The present invention relates to a novel process for producing the cilastatin sodium salt of the following structural formula (1) .

Conventional methods for preparing the cilastatin sodium salt of the above formula are known as the following known techniques.

For example, from 1-bromo-5-chloropentane (2) through a Grignard reaction, a preparation method such as the following scheme (European Patent Publication No. 48301) and ethyl-1.3-diti Synthesis method using an-2-carboxylate as a starting material (Donald W. Graham, Wallace T. Ashton, Louis Barash, Jeannette E. Brown, Ronald D. Brown, Laura F. Canning, Anna Chen, James P. Springer, Edward F. Rogers, J. Med. Chem., 30 , p1074, 1987).

The process is carried out in the first step to the reaction of 1-bromo-5-chloropentane (2) with ethyl 7-chloro-2-oxo-heptanoate (3) through a Grignard reaction with diethyl oxalate In the second step, ethyl 7-chloro-2-oxo-heptanoate (3) is reacted with ( S ) -2,2-dimethylcyclopropanecarboxamide to give ethyl ( Z ) -7-chloro-2 -(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate (4) is prepared. At this time, it was confirmed by gas chromatography that the isomeric compound (7) of the form ( E ) was formed as an impurity in an amount of 10 to 13% as described in the following reaction scheme, and the impurity was ( E )- It is hydrolyzed with 7-chloro-2-(( S ) -2,2-dimethylcyclopropylcarboxamido) -2-heptenic acid (8) .

In the conventionally known method, the impurities are removed by recrystallization after acid treatment, or by adding cysteine to the reaction solution in the third process in the fourth process, followed by acidification and heating ( E ) -7-chloro-2- (( S ) -2,2-dimethylcyclopropylcarboxamido) -2-heptenic acid reacts with (cysteine) (E) -7- (L-amino-2-carboxyethylthio) -2- ( Although ( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid was removed, the present inventors found that ( E ) -7-chloro, which is an impurity produced in the recrystallization process after performing the third process, was performed. -2-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid (8) due to ( Z ) -7-chloro-2-(( S ) -2,2- dimethyl cyclopropane was a very poor yield of the carboxamide shown) -2-heptyl tensan 5, also see below when heating the mixture (9) of the two isomers in the acidic conditions Scheme And as impurities 10 and (S) of the image-2,2-dimethylcyclohexylamine was confirmed decomposed propane carboxamide (11) as a high-performance liquid chromatography (HPLC), the impurity of the generated image (10) There was a great difficulty in removing it.

In addition, in order to obtain the cilastatin in the fourth step of the reaction scheme, the mixture was passed through a cation exchange resin, eluted with 2N ammonia solution, concentrated, and separated and purified by ethanol and diethyl ether to obtain the cilastatin (Z) -7- (L- Prepared in the form of an organic acid such as amino-2-carboxyethylthio) -2-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid (6), and in the fifth step sodium hydroxide Although it is known to prepare the cilastatin sodium salt (1) by reaction with it, in fact, as reported in WO 0318544, in fact, in the fourth step of the reaction scheme, the concentrated solution after condensation of ammonia solution is a Cilastatin organic acid (6). ) it was determined that in the form of an ammonium salt rather than in the form of, for cilastatin do with hydrochloric acid to obtain an organic acid to form accompanied by the formation of inorganic ammonium salts such as ammonium chloride of high purity sodium It was unable to obtain a salt.

Accordingly, International Patent Publication No. 0318544 prepared an organic acid of cilastatin by column separation using an HP 20 resin, which is a neutral resin, instead of a cation exchange resin in the fourth step of the reaction scheme. International Publication No. 02094742 Although the method of preparing cilastatin sodium salt (1 ) from the form (6) of the organic acid of cilastatin is disclosed, the method of separating the cilastatin through such a chromatography process is not suitable as a commercial production method. .

Accordingly, the inventors of the present invention have continuously studied a new manufacturing method for preparing the cilastatin sodium salt, and thus, by selectively removing the E isomer, which is a major impurity in the third step, in the reaction step, the inventors can synthesize the compound in an improved yield. It is also possible to simplify the process from the conventional method by separating and purifying ( Z ) -7-chloro-(( S ) -2,2-dimethyl cyclopropane carboxamido) -2-heptenic acid from the reaction solution in the form of a salt. The process was completed. In addition, unlike the conventional method of manufacturing by separating and purifying the cilastatin in the form of an organic acid and then converted to the form of sodium salt, after separating and purifying the cilastatin in the form of an amine salt, the pH is adjusted using sodium hydroxide and a cation exchange resin. By discovering that the desired compound, the cilastatin sodium salt (1) can be produced in high purity and high yield, the present invention has been completed.

It is an object of the present invention to provide a novel process for preparing the cilastatin sodium salt which is widely used as an adjuvant of imipenem.

In order to achieve the above object, the present invention provides the following structural formula (4) ethyl ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate is optionally hydrolyzed in a solvent to a base solution, followed by the pH of the reaction solution in the reactor. Adjusting the pH with an acid solution to remove unreacted substances remaining in the organic solvent layer; Concentrate the remaining water layer under reduced pressure, add alcohol to it, and stir until the solid is released while warming, remove the insoluble salts by filtration, and concentrate the remaining filtrate under reduced pressure. ( Z ) -7-chloro-(( S ) -2,2 represented by the following general formula (12) , characterized by carrying out a third step of obtaining by filtration through addition of an organic solvent for separation and purification to A novel preparation method for preparing -dimethyl cyclopropanecarboxamido) -2-heptenic acid salt is provided.

Wherein M ⁺ is an alkali metal salt.

In the first step of the reaction scheme, in order to selectively hydrolyze, an alcohol alone solvent such as water, methanol, ethanol and propanol or a mixed solvent thereof, preferably water and methanol, water and ethanol or a water and propanol mixed solvent Terminating the reaction when the ratio of (Z) isomer: (E) isomer is 100-10: 1, preferably 50-15: 1, more preferably 30-20: 1 The hydrolysis can be selectively (controlled reaction rate) through a method, etc., and a base usable for the hydrolysis reaction is preferably a strong base such as lithium hydroxide, sodium hydroxide or potassium hydroxide, and removes unreacted substances. As the organic solvent, solvents such as diisopropyl ether, dichloromethane, carbon tetrachloride, chloroform and hexane are preferable, and the pH is 6 to 8, preferably about pH 7, such as hydrochloric acid and sulfuric acid. Sikimeuroseo the base with an acid in the weak acid such as, such as an acid or acid neutralization can be pH adjusted.

In order for the solid of the second stage of the scheme to be released, the reaction is from about 10 to 80 ° C., preferably from 30 to 60 ° C., more preferably from about 50 ° C. for 10 minutes to 24 hours, preferably from 30 minutes to 1 Stirring for a period of time is preferable, and as the alcohol solvent for removing the resulting inorganic salt, it is preferable to use a lower alcohol alone solvent such as methanol, ethanol, propanol, or a mixed solvent thereof.

The organic solvent used in the separation and purification of the salt in the third step of the reaction scheme is preferably carried out in a single solvent such as acetonitrile, acetone, water and alcohol, alcohol and a mixed solvent of acetonitrile, alcohol and acetone.

Through the above manufacturing process, general formula (12) having a high purity of 90% or more can be obtained and quantitatively supplied to the next step, so that reproducibility in the synthesis of the silastatin amine salt of the following general formula (13) is obtained. It is possible to secure.

The M substituent in the above general formula (12) includes all possible alkali metal salts such as lithium salts, sodium salts, potassium salts and the like, and the present invention does not limit the kind of salts thereof.

In addition, the present invention is to react the ( Z ) -7-chloro-(( S ) -2,2-dimethyl cyclopropanecarboxamido) -2-heptenic acid or salt of the general formula (12) in the cysteine and the base solution First step; A second step of concentrating the reaction solution obtained in this step after adjusting the pH, adsorbing to a cation exchange resin, washing with water and then eluting with an amine solution; A third step of dissolving the concentrate using a solvent and slowly adding dropwise an alcohol to obtain a cilastatin amine salt of the following general formula (13) in pure form; After reacting the cilastatin amine salt (13) with sodium hydroxide, the cilastatin sodium salt represented by the following general formula (1) is characterized by carrying out a fourth step including a step of adjusting the pH with a cation exchange resin. It provides a manufacturing method for producing a.

In which R is a hydrogen atom or a lower alkyl group.

In the cilastatin amine salt of the general formula (13) of the above process, R is preferably a hydrogen atom or a lower alkyl group of C ₁ to C ₄ such as methyl group, ethyl group, propyl group and the like.

The first step of the reaction scheme is ( Z ) -7-chloro-(( S ) -2,2-dimethyl cyclopropanecarboxane of general formula (12) dissolved in an alcohol solvent such as water, methanol, ethanol and propanol. Mido) -2-heptenate salt is reactant such as sodium bromide, sodium iodide, potassium iodide, potassium bromide and the like and cysteine is about 10 to 80 ℃, preferably 30 in the presence of a strong base such as nitrogen gas and sodium hydroxide or potassium hydroxide It is preferred to react at from 1 to 60 hours, more preferably from about 55 ° C. for 1 hour to 24 hours, preferably from 5 hours to 10 hours, more preferably from about 8 hours.

In the second step of the reaction scheme, the reaction product obtained in the first step is adjusted to a pH of 3.0 to 7.0, preferably 5.0 to 5.5 with a strong acid such as sulfuric acid, hydrochloric acid and concentrated, and then an alcohol solvent such as methanol, ethanol, or propanol is concentrated. Added inorganic by stirring for about 10 minutes to 3 hours, preferably 30 minutes to 1.5 hours, and more preferably about 1 hour at about 10 to 80 캜, preferably 30 to 60 캜, more preferably about 50 캜. The salt is filtered off, concentrated to about 1/2 of the total volume of the solution, and the concentrate is adsorbed onto the cation exchange resin. At this time, a cation exchange resin such as a styrene strong acid resin is preferable. After washing with water until the conductivity is 20 kPa or less, preferably 10 kPa or less, the solution is dissolved using 1 to 5 N, preferably 2 N amine solution as the eluent. This was also the obtained leaching solution is preferably concentrated. In this step, when the ammonia solution is used as the eluent, the compound (13) obtained becomes a cilastatin ammonium salt, and when an amine aqueous solution is used, the compound (13) obtained according to the amine to be used obtains the corresponding cilastatin amine salt.

In the third step of the reaction scheme, the concentrate obtained in the second step is mixed with water, ammonia water or a mixture of water and ammonia water with a solvent, preferably a mixture of water, ammonia water or water and ammonia water, as compared with the cilastatin amine salt (13) . The solution is dissolved at a ratio of 1: 3 (w / v) to 2: 1 (w / v), and then alcohols such as ethanol, normal-propanol, and 2-propanol are preferably alcohols compared to the silastatin amine salt (13) . Is added dropwise at a ratio of 1:10 (w / v) to 1:40 (w / v) to carry out the recrystallization process and filtered to obtain the cilastatin amine salt (13) . The recrystallization step is a solid obtained through the recrystallization method of dropwise addition at a recrystallization temperature of 100 ℃ or less, preferably 5 to 97 ℃ or refluxed for about 1 to 12 hours, preferably 2 to 3 hours to precipitate Through cooling and filtration, it is possible to obtain the silastatin amine salt (13) of the following structural formula 4 in a relatively pure form.

In the fourth step of the reaction scheme, after dissolving a certain amount of sodium hydroxide in the cilastatin amine salt (13) obtained in the third step in the recrystallization solvent of the third step, the mixture is stirred for 10 minutes to 1.5 hours, more preferably about 30 minutes. After concentrating under reduced pressure at 30 to 70 DEG C, preferably about 60 DEG C, and stirring the water into a concentrated solid, the pH is adjusted to 6.0 to 8.0, preferably about 7.0 with the available cation exchange resin mentioned in the second step. After that, the filtrate obtained by filtration is freeze-dried, whereby it is possible to prepare the silastatin sodium salt represented by Structural Formula (1) in the purer form of higher purity (more than 99%) of the present invention.

Through the above reaction, the compound of formula (1) having a high purity of 99% or more can be obtained, and a new intermediate method for preparing the compound of formula (1) is obtained by separating and purifying the new intermediate cilastatin amine salt (13) .

Hereinafter, the manufacturing process of the present invention will be described in detail with the following scheme.

The preparation process of the present invention may be chemically synthesized by the method shown in Scheme 1 below, but is not limited to this example, and may be prepared by appropriate changes of reagents and starting materials known to those skilled in the art.

Ethyl 7-chloro-2-oxo-heptanoate (3) was prepared by reacting 1-bromo-5-chloropentane (2) with diethyl oxalate and Grignard as in Scheme 1. After reacting with ( S ) -2,2-dimethylcyclopropanecarboxamide ethyl ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate (4) is obtained. This was hydrolyzed using a mixed solvent selected from water and methanol, ethanol or propanol as a reaction solvent, and then the pH of the reaction solution was adjusted to 6 to 8, preferably pH 7, to remove unreacted material. The aqueous layer was concentrated, alcohol was added and the insoluble inorganic salt was filtered and concentrated, and while heating, an organic solvent such as acetonitrile, acetone or a mixed solvent of water and alcohol was added to the mixture to add ( Z ) -7-chloro-(( S )- The 2,2-dimethyl cyclopropanecarboxamido) -2-heptenic acid salt (12) was obtained by filtration to obtain a high purity of 90% or more, and by transferring it quantitatively to the next process, the reproducibility of the following process can be improved.

The above ( Z ) -7-chloro-(( S ) -2,2-dimethyl cyclopropanecarboxamido) -2-heptenic acid salt (12) is reacted with L-cysteine to adsorb to a cation exchange resin and washed with water. After eluting with 2N aqueous amine solution and concentrating, water, ammonia water or a mixed solution of water and ammonia water, preferably water, ammonia water, or a mixed solution of water and ammonia water in comparison with cilastatin amine salt (13) is 1: 3 (w / v) to 2: 1 (w / v) and then an alcohol such as ethanol, normal-propanol, 2-propanol, preferably 1:10 (w / alcohol ) relative to the cilastatin amine salt (13) . v) to 1:40 (w / v) dropwise to carry out the recrystallization process and filtration to obtain the cilastatin amine salt (13) . The recrystallization temperature is 100 ° C. or lower, preferably 5 to 97 ° C.

The cilastatin amine salt (13) was purified by repeating the above purification process, 1 to 1.5 equivalents of sodium hydroxide, preferably 1.1 to 1.2 equivalents, stirred for 10 minutes or more, concentrated, and then the concentrate was dissolved in water. The final cilastatin sodium salt (1) in pure form can be obtained by filtration and lyophilization by adjusting the pH within the range of 6.8 to 7.2 with a cation exchange resin.

The above process can be synthesized in a more advanced yield than the conventional method by selectively removing the E isomer, which is the main impurity in the third process, in the reaction process, and from the reaction solution, ( Z ) -7-chloro-(( S )- ( Z ) -7-chloro-(( S ) -2,2 in a simplified process than conventional methods by separating and purifying 2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid in the form of salt (12) -Dimethylcyclopropanecarboxamido) -2-heptenic acid salt (12) can be prepared in high purity and high yield. In addition , by separating and purifying the new intermediate cilastatin amine salt (13) in the fourth step, the cilastatin sodium (1) can be produced by a new production method.

The invention can be better understood by the following examples, which are intended to illustrate the invention and are not intended to limit the scope of protection thereof.

Reference Example 1. Ethyl ( Z ) -7-chloro-(( S Preparation of) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate (4)

Ethyl 7-chloro-2-oxo-heptanoate (3) was reacted with 1-bromo-5-chloropentane (291 g, 1.57 mol) through Grignard reaction with diethyl oxalate (206.5 g ) . After preparation, it was reacted with ( S ) -2,2-dimethyl cyclopropanecarboxamide to ethyl ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate (4) (237 g, 0.79 mol) was obtained. The preparation method was carried out with reference to the method described in European Patent Publication No. 48301.

Example 1. Z ) -7-chloro-(( S Preparation of) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid sodium salt (12)

1-1. ( Z ) -7-chloro-(( S Preparation of) -2,2-dimethylcyclopropanecarboxamido) -2-heptenate sodium salt (12)

Ethyl obtained in Reference Example 1 above ( Z ) -7-Chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate (237 g, 0.79 mol) was dissolved in methanol (877 ml) and then sodium hydroxide solution (1.8 L). , 0.48 mol) was added and stirred at room temperature. When the Z and E isomers reached 20: 1 through HPLC, the reaction was terminated. Then, the unreacted organics were extracted using dichloromethane (490 ml), and the pH was adjusted to 7-8 with 3N hydrochloric acid, followed by dichloromethane. (490 ml) was extracted once more. The water layer was concentrated under reduced pressure and poured ethanol (650 ml) at 50 ° C. and stirred for 30 minutes to 1 hour until the solid was dissolved and dissolved. Insoluble salts were removed by filtration and the filtrate was concentrated under reduced pressure. Acetonitrile (2.4 L) was added to the concentrate, followed by stirring to prepare ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenate sodium salt ( 12 ) (140.8 g, 55%).

m.p: 219 ℃

¹ H-NMR (D ₂ O _, 300 MHz) ppm: δ 0.87 (dd, 1H), 1.00 (dd, 1H), 1.14 (s, 3H), 1.19 (s, 3H), 1.61 (m, 2H), 1.68 (dd, 1H), 1.78 (m, 2H), 2.12 (m, 2H), 3.62 (t, 2H), 6.47 (t, 1H).

¹³ C-NMR (D ₂ O _, 300 MHz) ppm: δ 19.47, 19.99, 22.55, 25.74, 26.75, 27.53, 29.44, 32.27, 46.11, 131.41, 136.52, 172.74, 174.62.

1-2. ( Z ) -7-chloro-(( S Preparation of) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid (12-1)

( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenate sodium salt ( 12 ) (140.8 g) obtained in Example 1-1 was added to 422 ml of water. Dissolve and adjust the pH to 2.0-3.0 with 3N hydrochloric acid, extract twice with 592ml of isopropyl ether, add 59.2 g of anhydrous magnesium sulfate to the isopropyl ether layer, stir, filter, and concentrate ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid ( 12-1 ) (127.7 g, 98%) was obtained.

¹ H-NMR (CDCl _3, 300 MHz) ppm: δ 0.83 (dd, 1H), 1.19 (s, 7H), 1.44 (dd, 1H), 1.19 (s, 3H), 1.64 (m, 2H), 1.81 ( m, 2H), 2.21 (m, 2H), 3.54 (t, 2H), 6.78 (t, 1H). 70.4 (br, 1 H)

¹³ C-NMR (CDCl _3, 300 MHz) ppm: δ 18.69, 20.82, 22.86, 25.36, 27.03, 28.53, 29.27, 32.17, 44.60, 124.88, 139.49, 168.96, 170.15.

1-3. ( Z ) -7-chloro-(( S Preparation of) -2,2-dimethylcyclopropanecarboxamido) -2-heptenate ammonium salt (12-2)

( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid ( 12-1 ) (127.7 g) obtained in Example 1-2 was added to 422 ml of EtOH. Dissolve and add 100 mL of 25% aqueous ammonia and stir for 30 minutes, then concentrate to ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptanic acid ammonium salt ( 12-2 ) (135.6 g, 100%) was obtained.

Example 2. Preparation of Cilastatin Ammonium Salt (13-1)

4N of ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenate sodium salt (12) obtained in Example 1-1 (40 g, 0.14 mol) Dissolve with sodium hydroxide solution (120ml, 0.48mol) and ethanol (240ml), add NaBr (1.4g, 0.013mol) and L-cysteine-HCl.H ₂ O (25.3g) under nitrogen and stir at 55 ℃ for 8 hours. To complete the reaction. The pH of the reaction solution was concentrated to 5.5 to 5.0 with 3N hydrochloric acid solution and concentrated. Then, methanol (800 ml) was added, stirred at 50 ° C for 1 hour, and the insoluble salts were filtered out to remove the total solution. Concentrate until 2 minutes remain. The concentrated solution was adsorbed onto a cation exchange resin (PK208 model, Samyang), washed until the conductivity was 10us or less as water, eluted with 2N ammonia water, and the brown solid compound concentrated under reduced pressure was dissolved in water (40ml) and 2-propanol ( 0.8 L) was added to reflux for 2 hours, and the precipitated solid was cooled and filtered to obtain a cilastatin ammonium salt (13-1) (45.66 g, 90%).

m, p: 161 deg.

Elemental Analysis: C ₁₆ H ₂₉ N ₃ O ₅ S (MW 375.183) calcd C: 51.18; H: 7.78; N: 11.19; Found C: 51.01; H: 7.97; N: 11.04.

MS m / z 375 (M ⁺ , 49), 312 (36), 97 (84.2), 69 (100)

¹ H-NMR (D ₂ O _, 300 MHz) ppm: δ 0.87 (dd, 1H), 1.00 (dd, 1H), 1.14 (s, 3H), 1.19 (s, 3H), 1.62 (m, 5H), 2.11 (q, 2H), 2.62 (t, 2H), 3.06 (m, 4H), 3.91 (dd, 1H), 6.47 (t, 1H).

¹³ C-NMR (D ₂ O _, 300 MHz) ppm: δ 19.49, 19.97, 22.53, 26.74, 27.44, 27.86, 29.09, 29.43, 31.94, 32.85, 54.44, 131.23, 136.83, 172.70, 173.71, 174.64

Example 3. Preparation of Cilastatin Ethylamine Salt (13-2)

4N of ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid (12-1) (40 g, 0.15 mol) obtained in Example 1-2 was Dissolve with sodium hydroxide solution (165ml, 0.66mol) and ethanol (330ml), add NaBr (1.5g, 0.015mol) and L-cysteine.HCl.H ₂ O (27.6g) under nitrogen and stir at 55 ℃ for 8 hours. To complete the reaction. The pH of the reaction solution was concentrated to 5.5 to 5.0 with 3N hydrochloric acid solution and concentrated. Then, methanol (800 ml) was added, stirred at 50 ° C for 1 hour, and the insoluble salts were filtered out to remove the total solution. Concentrate until 2 minutes remain. The concentrate was adsorbed on a cation exchange resin, washed with water until the conductivity was 10us or less, eluted with 2N ethylamine water, and the brown solid compound concentrated under reduced pressure was dissolved in water (40ml) and 2-propanol (0.8L) The mixture was refluxed for 2 hours, and the precipitated solid was cooled and filtered to obtain a cilastatin ethylamine salt (13-2) (49.38 g, 90%).

¹ H-NMR (D ₂ O _, 300 MHz) ppm: δ 0.86 (dd, 1H), 1.00 (dd, 1H), 1.14 (s, 3H), 1.19 (s, 3H), 1.27 (t, 3H), 1.60 (m, 5H), 2.11 (q, 2H), 2.62 (t, 2H), 3.06 (m, 4H), 3.91 (dd, 1H), 6.47 (t, 1H).

¹³ C-NMR (D ₂ O _, 300 MHz) ppm: δ 14.7, 21.57, 22.04, 24.63, 28.82, 29.52, 29.94, 31.16, 31.49, 34.00, 34.91, 37.78, 56.50, 133.27, 138.96, 174.75, 175.81, 176.74

Example 4 Purification of Cilastatin Ammonium Salt

4-1. Purification using water and ethanol

Cilastatin ammonium salt ( 13-1 ) obtained in Example 2 (45.66 g, 0.12 mol) was dissolved in water (45.66 ml) and anhydrous ethanol (1.3 L) was added dropwise. The precipitated solid was filtered to give a high purity (99.8%) of cilastatin ammonium salt (38.81 g, 85%).

4-2. Purification Process Using Ammonia Water and Propanol (1)

Cilastatin ammonium salt ( 13-1 ) (50 g) obtained in Example 2 was dissolved in 25% aqueous ammonia (50 ml), 2-propanol (1.5 L) was added dropwise, and the precipitated solid was filtered to obtain a high purity cilastatin ammonium salt (41.2). g, 82.4%).

4-3. Purification using ammonia water and propanol (2)

Cilastatin ammonium salt ( 13-1 ) (50 g) obtained in Example 2 was dissolved in 25% ammonia water (100 ml) and 2-propanol (2.0 L) was added dropwise, and the precipitated solid was filtered and then the high-purity silastatin ammonium salt ( 35.4 g, 70.8%).

4-4. Purification process using ammonia water and ethanol

Cilastatin ammonium salt ( 13-1 ) (50 g) obtained in Example 2 was dissolved in 25% ammonia water (50 ml), and anhydrous ethanol (1.5 L) was added dropwise, and the precipitated solid was filtered to obtain a high purity cilastatin ammonium salt (35.6 g). , 71.2%).

4-5. Purification using a mixture of water and ammonia water and propanol (1)

Dissolve the cilastatin ammonium salt ( 13-1 ) (100 g) obtained in Example 2 in water (50 ml) and 4N ammonia water (50 ml), add 1-propanol (2.0 L) dropwise, and filter the precipitated solid to obtain high purity sila. Statin ammonium salt (89.3 g, 89.3%) was obtained.

4-6. Purification using a mixture of water and ammonia water and propanol (2)

Dissolve the cilastatin ammonium salt ( 13-1 ) (100 g) obtained in Example 2 in water (50 ml) and 2N ammonia water (50 ml), add 1-propanol (2.0 L) dropwise, and filter the precipitated solid to obtain a high purity sila. Statin ammonium salt (95.0 g, 95%) was obtained.

4-7. Purification process using mixed solution of water and ammonia water and propanol (3)

The cilastatin ammonium salt ( 13-1 ) (100 g) obtained in Example 2 was dissolved in water (100 ml) and 25% ammonia water (50 ml), 2-propanol (3.0 L) was added dropwise, and the precipitated solid was filtered to obtain high purity. Cilastatin ammonium salt (89.7 g, 89.7%) was obtained.

4-8. Purification using a mixture of water and ammonia water and propanol (4)

The cilastatin ammonium salt ( 13-1 ) (100 g) obtained in Example 2 was dissolved in water (50 ml) and 25% ammonia water (100 ml), 2-propanol (3.0 L) was added dropwise, and the precipitated solid was filtered to obtain high purity. Cilastatin ammonium salt (80.0 g, 80%) was obtained.

4-9. Purification using water and propanol

Cilastatin ammonium salt ( 13-1 ) (50 g) obtained in Example 2 was dissolved in water (100 ml), 2-propanol (1.5 L) was added to reflux, and the precipitated solid was cooled and filtered to obtain a high purity cilastatin ammonium salt (87.2). g, 87.2%).

Example 5 Preparation of Cilastatin Sodium Salt

Sodium hydroxide (4.28g, 0.107mol) was dissolved in water (38.3ml) and mixed well with ethanol (191.5ml) and then added to the cilastatin ammonium salt (38.81g, 0.1mol) obtained in Example 4-1 for 30 minutes Was stirred. The solution was concentrated under reduced pressure at 60 ° C. and dissolved by stirring with water (153 ml) in a concentrated solid. The pH was adjusted to 7.0 using a cation exchange resin, filtered, and the filtrate was lyophilized to obtain high purity (99.4). %) Cilastatin sodium salt.

Experimental Example 1. Purity Measurement

Purity of the cilastatin ammonium salt obtained in Example 4 was shown in Table 2 by HPLC measurement under the conditions of Table 1 below.

Analysis condition column Capcell pak C18 UG 120, 4.6 × 250㎜ (shiseido) Mobile phase A Acetonitrile: water containing 0.1% phosphoric acid (300: 700) Mobile phase B Water containing 0.1% phosphoric acid    Flow rate 2.0 ml / min Minutes Mobile phase A (% V / V) Mobile phase B (% V / V) 15 85 0-30 15 → 100 85 → 0 30-46 100 0 46-56 100 → 15 0 → 85 Column temperature 50 ℃ Detector waters 2487 dual λabsorbance detector (UV 210nm) Injection volume 20 μl

Example Compound 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 water(%) 99.8 99.3 99.3 99.8 99.6 99.5 99.8 99.7 99.6

The production method of the present invention is widely used cilastatin sodium salt intermediate which aids in the imipenem (Z) -7- chloro - ((S) -2,2- dimethyl cyclopropane carboxamide shown) -2-heptyl tensan salt E High yield in a simplified process by inhibiting isomer formation and separating and purifying with ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenic acid salt directly in the reaction liquid phase It can be obtained in high purity, and is also industrially useful as a novel preparation method for preparing a compound of high purity cilastatin sodium salt using sodium hydroxide and a cation exchange resin by separating and purifying a new intermediate cilastatin amine salt.

Claims (11)

Of the following structural formula (4) ethyl ( Z ) -7-chloro-(( S ) -2,2-dimethylcyclopropanecarboxamido) -2-heptenoate is optionally hydrolyzed with a base solution in a solvent of water and methanol or a mixture of water and ethanol, Successively adjusting the pH of the reaction solution to pH 6-7 with an acid solution in the reactor to remove unreacted material remaining in the organic solvent layer; Concentrate the remaining water layer under reduced pressure, add alcohol to it, and stir until the solid is released while warming, remove the insoluble salts by filtration, and concentrate the remaining filtrate under reduced pressure. ( Z ) -7-Chloro- represented by the following general formula (12) , characterized in that a third step of obtaining by filtration by adding acetonitrile, acetone, or a mixed solvent of water and alcohol is carried out for purification. Preparation method of preparing (( S ) -2,2-dimethyl cyclopropanecarboxamido) -2-heptenic acid salt:

Wherein M ⁺ is an alkali metal salt. M in the ( Z ) -7-chloro-(( S ) -2,2-dimethyl cyclopropanecarboxamido) -2-heptenic acid salt of the general formula (12) is M lithium salt, sodium salt Or potassium salts. delete delete delete delete delete delete delete delete delete