KR20080003600A - Maleate of pyrrolopyrimidinone derivative and process for preparing it - Google Patents

Abstract

A maleate of pyrrolopyrimidinone derivative having inhibitory effects on PDE-5(phosphodiesterase 5) is provided to improve stability against temperature, water and light, and physicochemical properties so as to be used as a pharmaceutically acceptable salt, so that the compound is useful for prevention and treatment of disease associated with PDE-5. A maleate of pyrrolopyrimidinone derivative having inhibitory effects on PDE-5, represented by the formula(1) is prepared by reacting pyrrolopyrimidinone represented by the formula(2) with maleic acid represented by the formula(3) at -30 to 50 deg.C. A pharmaceutical composition for treating impotence comprises the maleate of pyrrolopyrimidinone derivative represented by the formula(1), and is formulated as tablet, capsule or injection. A pharmaceutical composition for treating pulmonary arterial hypertension, chronic obstructive pulmonary disease, benign prostatic hypertrophy and lower urinary tract symptom comprises the maleate of pyrrolopyrimidinone derivative represented by the formula(1).

Description

Maleate salt of pyrrolopyrimidinone derivatives and preparation method thereof {Maleate of Pyrrolopyrimidinone Derivative and process for preparing it}

The present invention relates to a maleate salt of a pyrrolopyrimidinone derivative represented by the following Chemical Formula 1 having an excellent effect of inhibiting PDE-5 activity, and a method for preparing the same, and more particularly, to a pyrrolopyrimidinone represented by the following Chemical Formula 1 A crystalline acid addition salt prepared by reacting a derivative with maleic acid, which is not hygroscopic, has excellent long-term storage stability, light stability and thermal stability, and is effective as a therapeutic agent for erectile dysfunction represented by the following formula (1). It relates to a maleate salt of pyrrolopyrimidinone derivatives and a method for preparing the same.

[Formula 1]

Korean Patent No. 358083 discloses a pyrrolopyrimidinone derivative having a novel structure, an intermediate compound used in the preparation and preparation thereof, and a compound thereof having an excellent effect of inhibiting PDE-5 activity, thereby leading to erectile dysfunction and pulmonary arterial hypertension. ), Chronic obstructive pulmonary disease, Benign Prostatic Hypertrophy, lower urinary tract symptomatic treatment and prevention, pharmaceutical compositions and therapeutic agents are also disclosed.

Among the pyrrolopyrimidinone derivatives disclosed in Korean Patent No. 358083, 5-ethyl-2- {5- [4- (2-hydroxyethyl) piperazin-1-ylsulfonyl]- 2-n-propoxyphenyl} -7-n-propyll-3,5-dihydro-4H-pyrrolo [3,2-d] pyrimidin-4-one (hereinafter abbreviated as "SK-3530") PDE-5 has good selectivity for drug efficacy and other PDEs, and is selected as an optimal drug candidate through preclinical studies and may be in clinical trials as an erectile dysfunction treatment drug.

SK-3530 has been studied in the form of dihydrochloride salt represented by the formula (3) in preclinical and clinical.

SK-3530 dihydrochloride salt represented by the formula (3) is excellent in solubility, and there is no difficulty in stabilizing the formulation, but as a raw material itself has some problems to be solved.

First, the SK-3530 dihydrochloride salt is hygroscopic, and when the moisture content in the air is high, it easily absorbs and discolors. In addition, due to this hygroscopicity, a stable form may be obtained by simultaneously meeting anhydrous solvent conditions and dry atmospheric conditions in the manufacturing process.

Second, SK-3530 dihydrochloride should be stored at low temperature, not at room temperature, because the stability of the raw material itself is not sufficiently secured. SK-3530 dihydrochloride was not particularly stable to heat and light, resulting in a variety of flexible substances when exposed to heat and light.

Third, SK-3530 dihydrochloride salts are corrosive, and punching was observed during tableting. This is due to the fact that SK-3530 dihydrochloride is not a stable form of crystalline acid addition salt or hydrate, but an amorphous substance, in which one molecule of hydrochloric acid, which forms a weak ionic bond, is released from severe conditions That means you can.

As mentioned above, SK-3530 dihydrochloride can secure sufficient stability in formulation, but there is a problem in the physical properties and stability of the raw material itself, which requires additional technology and additional costs.

Thus, the present inventors can solve all of the above problems when manufactured with malate instead of hydrochloride after various efforts to solve the above problems in the raw material itself despite the pharmacological other advantages of SK-3530 dihydrochloride. It was found that crystalline acid addition salts suitable for formulation formulation were formed.

Accordingly, the present inventors were able to secure sufficient stability against temperature, moisture, and light by reacting the free base of SK-3530 with maleic acid, and also maintained excellent drug efficacy and effective blood concentration when administered as a drug. The present invention has been completed by preparing maleate salt, a novel crystalline acid addition salt of SK-3530, which satisfies all the conditions required as a pharmaceutically acceptable salt of.

Accordingly, it is an object of the present invention to provide a SK-3530 maleate salt that satisfies all the physicochemical conditions required as pharmaceutically acceptable salts.

Another object of the present invention is to provide a method for preparing SK-3530 maleate salt by reacting SK-3530 free base group with maleic acid.

In addition, the present invention is erectile dysfunction, pulmonary hypertension (Pulmonary arterial hypertension), Chronic Obstructive Pulmonary Disease (Benign Prostatic Hypertrophy), lower urinary tract symptoms containing SK-3530 maleate salt as an active ingredient It is another object to provide a pharmaceutical composition for treatment and prophylaxis.

The present invention has no hygroscopicity, is excellent in stability and efficacy, and exhibits the highest blood concentration at a physiologically useful time period, so that erectile dysfunction, pulmonary arterial hypertension, chronic obstructive pulmonary disease, and prostatic hyperplasia (Benign) Prostatic Hypertrophy), maleate salts of pyrrolopyrimidinone derivatives represented by the following formula (1), which are effective for treating and preventing lower urinary tract symptoms.

[Formula 1]

On the other hand, the present invention includes a method for preparing the SK-3530 maleate salt represented by the formula (1), the preparation method is shown in the following Scheme 1, SK-3530 free base represented by the following formula (2) and the following formula It is comprised by making maleic acid represented by 3 react.

When subdividing the production method of the present invention represented by the reaction scheme 1 for each process,

Dissolving or suspending maleic acid to prepare a maleic acid-containing reaction solution;

Preparing a mixture of the maleic acid-containing reaction solution and SK-3530 free base; And

Filtering, washing and drying the solid obtained by stirring the mixture to form a crystalline acid addition salt.

In the method for preparing the crystalline acid addition salt of SK-3530 according to the present invention, in preparing a mixture of SK-3530 free base and maleic acid, maleic acid may be added and mixed with SK-3530 free base, or SK-3530 to maleic acid. Free base can also be added and mixed.

The manufacturing method according to the present invention will be described in detail for each manufacturing step as follows.

In the process of preparing the maleic acid-containing reaction solution of the first step, it is important to control the concentration of maleic acid in the reaction solution. In order to efficiently promote crystallization, it is preferable to adjust the maleic acid concentration in the range of 1 to 30% by weight.

In the preparation of the mixture of SK-3530 free base and maleic acid in the second step, it is preferable to use 0.5 to 3.0 equivalents of maleic acid relative to SK-3530. In preparing the mixture, maleic acid may be added to the SK-3530 free base, or SK-3530 free base may be added to the maleic acid. In this case, SK-3530 free base may be added in a solid state or dissolved in a suitable reaction solvent. In more detail, the mixture of the maleic acid-containing reaction solution may be prepared by adding and mixing the SK-3530 free base solution in the solid state or the SK-3530 free base solution dissolved in a suitable solvent. As another method, a mixture may be prepared by adding and mixing a maleic acid-containing reaction solution into a SK-3530 free base in a solid state or a SK-3530 free base solution dissolved in a suitable solvent.

In the first and second steps described above, water or a conventional organic solvent is used as the reaction solvent, and particularly preferably, water or an organic solvent selected from acetone, methanol, ethanol, isopropanol and acetonitrile is used alone or in combination. will be.

The third step is the formation of the crystalline acid addition salt, the reaction is carried out in the temperature range of -30 to 50 ℃.

SK-3530 maleate salt represented by Formula 1 according to the present invention satisfies all of the following physicochemical conditions to be provided as a pharmaceutically acceptable salt. That is, all five of the following physical and chemical conditions are satisfied. (1) Low hygroscopicity (2) Proper solubility should be secured (3) Low adhesion of tablets (4) Excellent stability (5) Ease of mass production should be secured.

Therefore, the present invention is an erectile dysfunction, pulmonary arterial hypertension, chronic obstructive pulmonary disease (Chronic Obstructive Pulmonary Disease) containing the SK-3530 maleate salt represented by the formula (1) as an active ingredient, Benign Prostatic Hypertrophy), lower urinary tract symptoms, and pharmaceutical compositions for prevention.

The pharmaceutical composition according to the present invention can be administered orally or parenterally during clinical administration and can be used in the form of general pharmaceutical preparations. That is, it can be formulated into various formulations for oral and parenteral administration, which are prepared using diluents or excipients such as fillers, extenders, binders, wetting agents, disintegrating agents, surfactants, etc. which are commonly used. Solid form preparations for oral administration include tablets, pills, powders, granules, capsules and the like. Such solid preparations are prepared by mixing the active compound with at least one excipient such as starch, sucrose or lactose, gelatin and the like. In addition to simple excipients, lubricants such as magnesium stearate and talc are also used. Liquid preparations for oral administration include suspending agents, solvents, emulsions, syrups, and the like, and various excipients such as wetting agents, sweeteners, fragrances, and preservatives, in addition to commonly used simple diluents such as water and liquid paraffin. . Formulations for parenteral administration include sterile aqueous solutions, non-aqueous solvents, suspensions, emulsions, lyophilized preparations, suppositories. As the non-aqueous solvent and the suspension solvent, propylene glycol, polyethylene glycol, vegetable oil such as olive oil, injectable ester such as ethyl oleate, and the like can be used. As the base of the suppository, witepsol, macrogol, Tween 61, cacao butter, laurin butter, glycerogelatin and the like can be used.

The dosage of the pharmaceutical composition according to the present invention to the human body may vary depending on the age, weight, sex, dosage form, health condition and degree of disease of the patient. The effective dose of SK-3530 maleate salt represented by Formula 1 is 10.0 to 200.0 mg based on SK-3530 free base. Preferably it is 20-150 mg.

The present invention as described above will be described in more detail based on the following Examples and Experimental Examples, but the present invention is not limited thereto.

Example 1 Preparation of SK-3530 Maleate Salt

1.44 g of maleic acid was dissolved in 100 ml of acetone and the reaction solution was stirred at room temperature. 6.0 g of SK-3530 free base was slowly added to the maleic acid reaction solution. The mixture was stirred at room temperature for 1 hour, and then 50 ml of acetone was concentrated under reduced pressure to remove the resulting solid. The resulting solid was filtered, washed with 20 ml of ether and dried in vacuo at 50 ° C. to give 7.02 g of the title compound as a white crystal (yield). 96.0%).

¹ H-NMR (300 MHz, DMSO-d ₆ ) δ (ppm) 11.73 (s, 1H), 7.94 (d, 1H), 7.84 (dd, 1H), 7.42 (d, 1H), 7.32 (s, 1H) , 6.08 (s, 2H), 4.37 (q, 2H), 4.14 (t, 2H), 3.62 (t, 2H), 3.52-2.70 (m, 10H), 2.57 (t, 2H), 1.79-1.60 (m , 4H), 1.36 (t, 3H), 0.97 (t, 3H), 0.92 (t, 3H)

Example 2: Preparation of SK-3530 Maleate Salt

1.44 g of maleic acid was dissolved in 100 ml of acetone and the reaction solution was stirred at room temperature. 6.0 g of SK-3530 free base was dissolved in 100 ml of acetone, and then slowly added to the maleic acid reaction solution. The mixture was stirred at room temperature for 1 hour, and then 50 mL of acetone was removed by concentration under reduced pressure. The resulting solid was filtered, washed with 20 mL of ether and dried in vacuo at 50 ° C. to obtain the title compound as white crystals.

Example 3: Preparation of SK-3530 Maleate Salt

60 mg of SK-3530 free base was suspended in 1 ml of acetone and the reaction solution was stirred at room temperature. 14.4 mg of maleic acid was dissolved in a mixed solvent of 1 ml of acetone and 2 ml of water, and then slowly added to the SK-3530 free base reaction solution. The mixture was stirred at room temperature for 1 hour, and then the resulting solid was filtered, washed with 20 ml of acetone and dried in vacuo at 50 ° C. to obtain the title compound as white crystals.

Example 4: Formulation of SK-3530 Maleate Salt-Containing Tablets

Anhydrous calcium hydrogen phosphate (315 g) and microcrystalline cellulose (525 g, 90 μm) were combined and transferred to a drum. SK-3530 maleate salt (70 g) and microcrystalline cellulose (187.5 g, 50 μm) were combined and passed through the screen into a drum containing the powder mixture. The screen used in the previous step was washed with microcrystalline cellulose (525 g, 90 μm). Anhydrous calcium hydrogen phosphate (315 g) was added to the mixture and the entire mixture was blended for 10 minutes. Sodium starch glycolate (40 g) was then added to the mixture and blended for 6 minutes. Finally, magnesium stearate (20 g) was added and the resulting mixture was blended for 3 minutes. The powder mixture was then compressed into tablets by conventional methods.

Example 5 Formulation of SK-3530 Maleate Salt-containing Capsules

Microcrystalline cellulose (525 g, 90 μm) and dry corn starch were premixed, then SK-3530 maleate salt (70 g) was mixed with a portion of the premix and sieved. The remaining premix was added and mixed for 10 minutes, then sieved and further mixed for 5 minutes. And the capsule of appropriate size was made to manufacture the capsule.

Example 6: Formulation of SK-3530 Maleate Salt-Injectable Injection

Sodium chloride was dissolved in sterile water for injection and propylene glycol was mixed with this solution. SK-3530 maleate salt was added, and when dissolved, additional sterile water for injection was added to prepare a solution of the desired concentration. This solution was filtered through a sterile filter and filled into sterile ampoules used as injection containers.

Experimental Example 1: Stability Test

This experimental example is an experimental example for confirming the storage stability of the SK-3530 maleate salt.

1) Moisture and air stability test

In order to process the drug into a specific formulation, sufficient stability needs to be ensured, e.g., when it is formulated into tablets or capsules, atmospheric stability will be particularly required, and when formulated into injections, the stability against water (water) is particularly May be required.

The following Table 1 is at 25 ℃ temperature and 75% humidity conditions, the following Table 2 is at 40 ℃ temperature and 60% humidity conditions, the following Table 3 is at 50 ℃ temperature and 75% humidity conditions, respectively SK-3530 dihydrochloride ( 2HCl) and SK-3530 maleate are stored and the results of the measurement of the total amount of the flexible substance by liquid chromatography after 1 and 3 weeks.

SK-3530 salt % Of lead substance at 25 ° C and 75% humidity Early 1 week 3 weeks SK-3530 dihydrochloride 0.20 0.24 0.31 SK-3530 maleate salt 0.12 0.12 0.12

SK-3530 salt % Of lead substance at 40 ℃ and 60% humidity Early 1 week 3 weeks SK-3530 dihydrochloride 0.20 0.24 0.38 SK-3530 maleate salt 0.12 0.12 0.12

SK-3530 salt % Of lead substance at 50 ℃ and 75% humidity Early 1 week 3 weeks SK-3530 dihydrochloride 0.20 0.27 0.42 SK-3530 maleate salt 0.12 0.15 0.19

2) Light stability check experiment

Table 4 and Table 5 show the results of the light stability comparison experiment, the total amount of ultraviolet light (UV) is 200 W · h / ㎡, the total amount of visible light (visible light) is 1080 klux / m ² h. Each salt was stored in a Petri dish and the storage conditions were 25 ° C temperature and 60% humidity conditions.

SK-3530 salt Content of Leading Material (%) Early Ultraviolet (UV) Visible light SK-3530 dihydrochloride 0.20 5.92 1.37 SK-3530 maleate salt 0.12 0.35 0.14

SK-3530 salt Change of color Early Ultraviolet (UV) Visible light SK-3530 dihydrochloride White Brown yellow SK-3530 maleate salt White White White

3) thermal stability test

Table 6 and Table 7 show the results of the thermal stability comparison experiment. Each salt was placed in a petri dish and placed in a dryer at 105 ° C. to visually observe the results after 3 and 48 hours.

SK-3530 salt Content of Leading Material (%) Early 3 hours 48 hours SK-3530 dihydrochloride 0.20 3.06 14.37 SK-3530 maleate salt 0.12 0.15 0.74

SK-3530 salt Change of color Early 3 hours 48 hours SK-3530 dihydrochloride White White yellow SK-3530 maleate salt White White White

As shown in Table 1 to Table 7, it was confirmed that the SK-3530 maleate salt is much better than the existing SK-3530 dihydrochloride salts, and the light stability and thermal stability against UV and visible light.

As described above, the SK-3530 maleate salt according to the present invention is a crystalline acid addition salt suitable for the preparation of pharmaceutical formulations, and thus has an excellent effect of inhibiting PDE-5 activity. It can be usefully used as a pharmaceutical composition for treating and preventing Chronic Obstructive Pulmonary Disease, Benign Prostatic Hypertrophy, and Lower Urinary Tract Symptoms.

Claims (12)

Maleate salt of pyrrolopyrimidinone derivatives, characterized by the following formula (1): [Formula 1]

Method for producing a maleate salt of the pyrrolopyrimidinone derivative represented by the following formula (1) characterized in that it is prepared by reacting a pyrrolopyrimidinone derivative represented by the formula (2) and maleic acid represented by the following formula (3):

The method of claim 2, Preparing a maleic acid-containing reaction solution by dissolving or suspending maleic acid represented by Chemical Formula 3; Preparing a mixture of the pyrrolopyrimidinone derivative represented by Formula 2 and the maleic acid-containing reaction solution; And Filtering, washing and drying the solid obtained by stirring the mixture to form a crystalline acid addition salt; Manufacturing method characterized in that comprises a. The method of claim 2 or 3, wherein the concentration of maleic acid in the reaction solution is 1 to 30% by weight. The solvent for dissolving or suspending maleic acid represented by the formula (3) is a single solvent or a mixed solvent selected from the group consisting of water, acetone, methanol, ethanol, isopropanol and acetonitrile. Manufacturing method. The method according to claim 2 or 3, wherein the maleic acid represented by Chemical Formula 3 is used in a range of 0.5 to 3.0 equivalents relative to the pyrrolopyrimidinone derivative represented by Chemical Formula 2. The method of claim 2 or 3, wherein the reaction is carried out at a temperature range of -30 to 50 ℃. The method according to claim 2 or 3, wherein the pyrrolopyrimidinone derivative represented by Chemical Formula 2 is used in a solid state or in a solution dissolved in a solvent. The solvent for dissolving the pyrrolopyrimidinone derivative represented by Chemical Formula 2 is a single solvent or a mixed solvent selected from the group consisting of water, acetone, methanol, ethanol, isopropanol and acetonitrile. Manufacturing method. A pharmaceutical composition for treating erectile dysfunction comprising a maleate salt of a pyrrolopyrimidinone derivative represented by the following Chemical Formula 1 as an active ingredient: [Formula 1]

Pulmonary arterial hypertension, Chronic Obstructive Pulmonary Disease, Benign Prostatic Hypertrophy, and Lower Urinary Tract Pharmaceutical compositions for the treatment of symptoms: [Formula 1]

The pharmaceutical composition according to claim 10 or 11, formulated as a tablet, capsule or injection.