JP6268093B2 - Process for producing fused heterocyclic derivative and production intermediate thereof - Google Patents

Description

  The present invention relates to a novel process for producing a fused heterocyclic derivative useful as a pharmaceutical product and a production intermediate thereof.

Formula (A):
The compound represented by (hereinafter referred to as compound (A)) or a salt thereof is, for example, prostatic hypertrophy, uterine fibroid, endometriosis, uterine fibroma, precocious puberty, amenorrhea, premenstrual syndrome Dysmenorrhea, polycystic ovary syndrome, lupus erythematosus, hirsutism, dwarfism, sleep disorder, acne, baldness, Alzheimer's disease, infertility, irritable bowel syndrome, prostate cancer, uterine cancer, ovarian cancer, It is reported to be useful as a preventive or therapeutic agent for sex hormone-dependent diseases such as breast cancer and pituitary tumor, a reproductive regulator, a contraceptive, an ovulation inducer, or a preventive agent for sex hormone-dependent cancer postoperative recurrence (For example, refer to Patent Document 1).

The compound (A) is
Formula (B-1):
And formula (E):
It has been reported that the compound represented by the formula can be produced by condensation using triphosgene, followed by intramolecular cyclization and subsequent hydrolysis (for example, see Patent Document 1).

  However, since triphosgene may produce highly toxic phosgene, it must be handled with care, and special equipment is required for industrial use. In terms of operability, it is industrially complicated to use a plurality of solvents, concentrate under reduced pressure, perform a large number of liquid separation operations, and the like. Furthermore, there is a problem in industrially producing the compound (A) or a salt thereof from the viewpoints of using column chromatography and the overall yield. From these things, establishment of the method excellent in industrial manufacture of a compound (A) or its salt was desired.

International Publication No. 2007/046392 Pamphlet

  An object of the present invention is to provide an industrially superior production method and production intermediates compared to conventional methods for producing a condensed heterocyclic derivative.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have obtained general formula (D):
Through the production intermediate represented by the formula, the present invention is industrially useful, and furthermore, a method for producing the compound (A) or a salt thereof in a high yield and high purity has been found, and the present invention has been achieved. .
That is, the present invention

(1) Formula (A):
A method for producing a compound represented by the formula or a salt thereof, wherein the method comprises the following steps:
Step 1:
Formula (B):
(Wherein R ¹ and R ² are the same or different C _1-6 alkyl groups) or a salt thereof is represented by the general formula (C):
(Wherein R ³ is a hydrogen atom, a halogen atom, a C _1-6 alkyl group or a nitro group, and X is a chlorine atom or a bromine atom). ):
(Wherein R ¹ , R ² and R ³ have the same meaning as described above),
Step 2:
The compound represented by the general formula (D) is represented by the formula (E):
And a compound represented by the general formula (F):
(Wherein R ¹ and R ² have the same meaning as described above);
Step 3:
A step of producing a compound represented by the formula (A) by intramolecular cyclization of the compound represented by the general formula (F) and hydrolysis of R ² ; and step 4:
If necessary, a step of converting the compound represented by the formula (A) into a salt thereof;

(2) The production method according to (1), wherein R ¹ and R ² are a methyl group or an ethyl group, R ³ is a hydrogen atom, and X is a chlorine atom;
(3) The production method according to (1) or (2), wherein step 2 is performed in the presence of a base;
(4) The production method according to (3), wherein the base is selected from the group consisting of N, N-dimethylaminopyridine and triethylamine;
(5) The production method according to (1) or (2), wherein step 3 is performed in the presence of a base;
(6) The production method according to (5), wherein the base is selected from the group consisting of lithium hydroxide and sodium methoxide;
(7) The production method according to (1) to (6), wherein the salt of the compound represented by the formula (A) is a choline salt;
(8) The production method according to (7), wherein the reagent used for the conversion to a choline salt is selected from the group consisting of choline hydroxide, choline bicarbonate, choline chloride and choline acetate;
(9) General formula (D):
(Wherein R ¹ , R ² and R ³ have the same meaning as described above);
(10) The compound according to (9), wherein R ¹ and R ² are a methyl group or an ethyl group, and R ³ is a hydrogen atom;

  In the present invention, the following terms have the following meanings unless otherwise specified.

  A halogen atom means a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.

C _1-6 alkyl group means methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group, tert-pentyl group. , 1-methylbutyl group, 2-methylbutyl group, hexyl group and the like, which are linear or branched alkyl groups having 1 to 6 carbon atoms. R ¹ and R ² are preferably the same.

Hereinafter, the specific manufacturing method of this invention is illustrated.
(In the formula, R ¹ , R ² , R ³ and X have the same meaning as described above.)

(Process 1)
Compound (D) can be produced by reacting compound (B) or a salt thereof with compound (C) in the presence of a base in a solvent. Examples of the solvent include halogen solvents such as dichloromethane, cyclic ethers such as tetrahydrofuran, 2-methyltetrahydrofuran, and tetrahydropyran, amide solvents such as N, N-dimethylformamide, aromatic hydrocarbon solvents such as toluene, A nitrile solvent such as acetonitrile, an ester solvent such as ethyl acetate, or a mixed solvent thereof and a mixed solvent thereof and water are preferable, and a mixed solvent of tetrahydrofuran and water is preferable. Examples of the base include organic bases such as triethylamine and pyridine, and inorganic bases such as sodium hydrogen carbonate, potassium hydrogen carbonate, cesium carbonate, sodium carbonate, and potassium carbonate, preferably triethylamine, sodium hydrogen carbonate, or potassium carbonate Is mentioned. The equivalent of the base may be an equivalent amount capable of neutralizing the salt and neutralizing the acid generated by the reaction. The equivalent of (C) can be used in an amount of 0.8 to 1.1 equivalents relative to (B), preferably 1.0 equivalent. The reaction temperature is usually from 0 to 30 ° C., and the reaction time is usually from 0.5 to 3 hours, although it varies depending on the raw material used, the solvent, the reaction temperature and the like. Examples of the salt of the compound (B) include a salt with an inorganic acid, a salt with an organic acid, a salt with an acidic amino acid, and the like. Examples of the salt with an inorganic acid include salts with hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid and the like. Examples of salts with organic acids include formic acid, acetic acid, trifluoroacetic acid, fumaric acid, oxalic acid, tartaric acid, maleic acid, citric acid, succinic acid, malic acid, methanesulfonic acid, benzenesulfonic acid, p-toluene. And salts with sulfonic acid and the like. Examples of salts with acidic amino acids include salts with aspartic acid, glutamic acid and the like. Among these salts, salts with hydrochloric acid and methanesulfonic acid are preferable. Compound (C) used in Scheme 1 may be a commercially available product, or can be produced according to a known method or a method analogous thereto. Compound (D) may be isolated before the next step, but it can also be used in the next step without isolation.

(Process 2)
Compound (F) can be produced by reacting compound (D) with compound (E) or a salt thereof in a solvent in the presence or absence of a base. Examples of the solvent include cyclic ethers such as tetrahydrofuran, 2-methyltetrahydrofuran, tetrahydropyran, amide solvents such as N, N-dimethylformamide, aromatic hydrocarbon solvents such as toluene, nitrile solvents such as acetonitrile, An ester solvent such as ethyl acetate or a mixed solvent thereof and a mixed solvent thereof with water, and the like are preferable, and a mixed solvent of tetrahydrofuran and water is preferable. Examples of the base include organic bases such as N, N-dimethylaminopyridine, triethylamine, N-methylpyrrolidine, N-methylmorpholine, diisopropylethylamine, and preferably N, N-dimethylaminopyridine, triethylamine and the like. . The equivalent of the base can be used in an amount of 0.1 to 2.0 equivalents relative to the compound (E), preferably 0.1 to 0.5 equivalents (provided that when a salt of the compound (E) is used, Further base necessary for neutralization is required). The reaction temperature is from room temperature to 60 ° C., and the reaction time is usually from 1 to 24 hours, although it varies depending on the raw material used, solvent, reaction temperature and the like. Examples of the salt of compound (E) include a salt with an inorganic acid, a salt with an organic acid, a salt with an acidic amino acid, and the like. Examples of the salt with an inorganic acid include salts with hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid and the like. Examples of salts with organic acids include formic acid, acetic acid, trifluoroacetic acid, fumaric acid, oxalic acid, tartaric acid, maleic acid, citric acid, succinic acid, malic acid, methanesulfonic acid, benzenesulfonic acid, p-toluene. And salts with sulfonic acid and the like. Examples of salts with acidic amino acids include salts with aspartic acid, glutamic acid and the like. Compound (F) may be isolated before the next step, but it can also be used in the next step without isolation.

(Process 3)
The intramolecular cyclization and hydrolysis reaction in this step can be performed simultaneously or separately.
(Step 3-1)
Compound (A) can be produced by subjecting compound (F) to intramolecular cyclization and hydrolysis in the presence of a base in a solvent. Examples of the solvent include cyclic ethers such as tetrahydrofuran, 2-methyltetrahydrofuran and tetrahydropyran, lower alcohols such as methanol, ethanol and 2-propanol, amide solvents such as N, N-dimethylformamide, and nitriles such as acetonitrile. Examples thereof include a solvent and the like or a mixed solvent of a mixed solvent thereof and water, and a mixed solvent of tetrahydrofuran / methanol / water is preferable. Examples of the base include inorganic bases such as sodium hydroxide, potassium hydroxide, lithium hydroxide and sodium hydride, and metal alkoxides such as sodium methoxide and potassium tert-butoxide, preferably lithium hydroxide and sodium And methoxide. The base can be used in an amount of 3.0 to 6.0 equivalents, preferably 4.0 to 4.5 equivalents, relative to compound (F). The reaction temperature is usually 0 to 20 ° C., and the reaction time is usually 1 to 10 hours, although it varies depending on the raw material used, the solvent, the reaction temperature and the like.
(Step 3-2)
When isolating compound (G), compound (G) can be produced by subjecting compound (F) to an intramolecular cyclization reaction in a solvent in the presence of a base. Examples of the solvent include cyclic ethers such as tetrahydrofuran, 2-methyltetrahydrofuran and tetrahydropyran, lower alcohols such as methanol, ethanol and 2-propanol, amide solvents such as N and N-dimethylformamide, and nitriles such as acetonitrile. Examples thereof include a solvent and the like or a mixed solvent thereof, and a mixed solvent of tetrahydrofuran / methanol is preferable. Examples of the base include inorganic bases such as sodium hydroxide, potassium hydroxide, lithium hydroxide or sodium hydride, metal alkoxides such as sodium methoxide and potassium tert-butoxide, and lithium hydroxide and sodium methoxide. preferable. 0.1-1.5 equivalent can be used for the equivalent of a base with respect to a compound (F), Preferably 1.0-1.1 equivalent is used. The reaction temperature is usually 0 to 20 ° C., and the reaction time is usually 1 to 10 hours, although it varies depending on the raw material used, the solvent, the reaction temperature and the like.
(Step 3-3)
The hydrolysis reaction in this step can be performed by the same method as in step 3-1 or a method analogous thereto.

(Process 4)
Compound (A) can be converted to a salt thereof by a conventional method. Examples of such salts include inorganic salts such as sodium salts, potassium salts, calcium salts, and magnesium salts, triethylamine, diisopropylamine, N, N′-dibenzylethylenediamine, ethanolamine, and (2-hydroxyethyl) trimethylammonium. (Hereinafter referred to as choline), addition salts with organic bases such as N-methylglucamine, arginine, lysine and the like, and choline salts are preferred. Examples of the reagent used for conversion to the choline salt include choline hydroxide, choline bicarbonate, choline chloride and choline acetate.

Here, the compound (B) and the salt thereof used in the above-mentioned scheme 1 are commercially available, or manufactured by the method described in a) to c), the method described in Reference Examples, or a method analogous thereto. Can do.
a) JP-A 64-29373
b) Synthetic Communications, 32, 2565 (2002)
c) Synthesis, 200 (1977)

  The compound (E) or a salt thereof used in the scheme 1 can be produced by the method described in Patent Document 1, the method described in Reference Examples, or a method analogous thereto.

  The compound obtained in the production process in the present specification includes hydrates or solvates thereof, and any of them can be used. Furthermore, the compounds obtained in the production process in the present specification may have tautomers and / or geometric isomers, any of which can be used, and also a mixture thereof. be able to.

  According to the production method of the present invention, the compound (A) or a salt thereof useful as a pharmaceutical product can be obtained with high yield and high purity through the compound (D) which is a production intermediate.

  The content of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the content.

Reference example 1
Dimethyl 4-oxothiolane-2,3-dicarboxylate methylthioglycolate (15.0 g), tetrahydrofuran (45 g), piperidine (0.361 g) in a reaction mixture at room temperature with dimethyl maleate (21.4 g) in tetrahydrofuran (30 g) The solution was added. To the reaction mixture was added 20% sodium methoxide in methanol (43 g) at 55 ° C. under a nitrogen atmosphere. The reaction mixture was stirred at reflux for 3 hours. Diisopropyl ether (105 g) and acetic acid (0.85 g) were added to the reaction mixture at 45 to 50 ° C., and then cooled. The suspension was filtered to obtain wet crystals of sodium dimethyl 4-oxothiolane-2,3-dicarboxylate (43.3 g). The wet crystals were added to a mixture of 85% phosphoric acid (9.8 g), water (20 g) and ethyl acetate (150 g) at room temperature, and the aqueous layer was removed. The obtained organic layer was washed with 10% brine and then dried over anhydrous magnesium sulfate. The drying agent was removed by filtration, and the filtrate was concentrated under reduced pressure to obtain the title compound (22.7 g).

Reference example 2
Dimethyl 4- (hydroxyimino) thiolane-2,3-dicarboxylate Mixture of dimethyl 4-oxothiolane-2,3-dicarboxylate (10.0 g), pyridine (5.44 g), hydroxylamine hydrochloride (3.34 g) Was stirred at 50 ° C. for 1 hour. Ethyl acetate and 7% aqueous phosphoric acid solution were added to the reaction mixture at room temperature, and the aqueous layer was removed. The obtained organic layer was washed with 5% sodium bicarbonate water and 10% brine. The organic layer was dried over anhydrous sodium sulfate. After removing the desiccant by filtration, the filtrate was concentrated under reduced pressure to obtain the title compound (10.4 g).

Reference example 3
4-Aminothiophene-2,3-dicarboxylate dimethyl hydrochloride 4- (hydroxyimino) thiolane-2,3-dicarboxylate (10.4 g) in acetic acid (32 g) solution in 4N-hydrogen chloride / ethyl acetate solution ( 120 g) was added at room temperature. The reaction mixture was stirred at room temperature for 8 hours. After filtering the suspension, the obtained solid was dried to obtain the title compound (9.42 g).

Reference example 4
4-Aminothiophene-2,3-dicarboxylic acid dimethyl methanesulfonate To a solution of methanesulfonic acid (80.0 g) in ethyl acetate (900 g), dimethyl 4- (hydroxyimino) thiolane-2,3-dicarboxylate (97. 1 g) of ethyl acetate (500 g) was added at 65-75 ° C. The reaction mixture was stirred at the same temperature for 2 hours. Methyl isobutyl ketone (100 g) was added at 45-50 ° C. and cooled to room temperature. After filtering the suspension, the obtained solid was dried to obtain the title compound (102 g).

Reference Example 5
1,2-difluoro-3-[(4-fluoro-2-methoxyphenoxy) methyl] -4-methoxybenzene sodium borohydride in a solution of 2,3-difluoro-6-methoxybenzaldehyde (150 g) in toluene (900 g) (13.2 g) of 0.1 N aqueous sodium hydroxide (180 g) was added at 35-39 ° C. The reaction mixture was stirred at the same temperature for 5 hours. After cooling the reaction mixture to room temperature, the aqueous layer was removed. The obtained organic layer was washed with 20% brine to obtain a toluene solution of 2,3-difluoro-6-methoxybenzyl alcohol. To this solution was added concentrated hydrochloric acid (610 g) at room temperature. The reaction mixture was stirred at 38-43 ° C. for 5 hours. After cooling the reaction mixture to room temperature, the aqueous layer was removed. The obtained organic layer was washed with water and 20% brine to obtain a toluene solution of 3- (chloromethyl) -1,2-difluoro-4-methoxybenzene. 4-Fluoro-2-methoxyphenol (125 g) and tetrabutylammonium bromide (56.2 g) were added to this solution at room temperature. A 25% aqueous sodium hydroxide solution (170 g) was added to the reaction mixture at 60 to 63 ° C., and the mixture was stirred at the same temperature for 4 hours. Water was added to the reaction mixture and the aqueous layer was removed. The obtained organic layer was washed with water and concentrated under reduced pressure. The residue was dissolved in 2-propanol and water was added. After filtering the suspension, the obtained solid was dried to obtain the title compound (232 g).

Reference Example 6
1,2-difluoro-3-[(4-fluoro-2-methoxy-5-nitrophenoxy) methyl] -4-methoxybenzene 1,2-difluoro-3-[(4-fluoro-2-methoxyphenoxy) methyl ] To a solution of 4-methoxybenzene (158 g) in acetic acid (1200 g) was added 60% nitric acid (72.2 g) at 59-62 ° C., and the mixture was stirred at the same temperature for 2 hours. Water (1200 g) was added to the suspension at 15 to 19 ° C., and the mixture was stirred at the same temperature for 1 hour. After filtering the suspension, the obtained solid was washed with water to obtain wet crystals of the title compound (190 g, Net amount 168 g).

Reference Example 7
2-fluoro-5-[(2,3-difluoro-6-methoxyphenyl) methoxy] -4-methoxyaniline Raney nickel (2.5 g), ethyl acetate (180 g), 1,2-difluoro-3-[(4 -Fluoro-2-methoxy-5-nitrophenoxy) methyl] -4-methoxybenzene wet crystal (10.9 g, Net amount 10.0 g) was stirred at room temperature under hydrogen atmosphere for 4 hours. The catalyst was removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was dissolved with methanol and water was added. After filtering the suspension, the obtained solid was dried to obtain the title compound (7.97 g).

Example 1
4- (phenoxycarbonylamino) thiophene-2,3-dicarboxylic acid dimethyl potassium carbonate (17.1 g), water (90 g), tetrahydrofuran (150 g) and 4-aminothiophene-2,3-dicarboxylic acid dimethyl hydrochloride (30 0.06) to the reaction mixture was added phenyl chloroformate (18.6 g) at 6-13 ° C. After stirring the reaction mixture at 12-13 ° C. for 30 minutes, the aqueous layer was removed. To the obtained organic layer, tert-butyl methyl ether was added and washed with 20% brine. The obtained organic layer was concentrated under reduced pressure. The residue was dissolved with diisopropyl ether, and n-hexane was added. After filtering the suspension, the obtained solid was dried to obtain the title compound (37.0 g).
¹ H-NMR (DMSO-d ₆ ) δ ppm: 3.82 (3H, s), 3.82 (3H, s), 7.13-7.30 (3H, m), 7.40-7.46 (2H, m), 7.80 (1H, s ), 10.24 (1H, s)

Example 2
4- {3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] ureido} thiophene-2,3-dicarboxylate 2-fluoro-5-[( 2,3-difluoro-6-methoxyphenyl) methoxy] -4-methoxyaniline (7.70 g), dimethyl 4- (phenoxycarbonylamino) thiophene-2,3-dicarboxylate (8.65 g), triethylamine (0. 37 g) and tetrahydrofuran (80 mL) were stirred at room temperature for 24 hours. The reaction mixture was concentrated under reduced pressure. Ethyl acetate and methanol were added to the residue. After filtering the suspension, the obtained solid was dried to obtain the title compound (12.0 g).
¹ H-NMR (DMSO-d ₆ ) δ ppm: 3.71 (3H, s), 3.82 (3H, s), 3.83 (3H, s), 3.89 (3H, s), 5.00 (2H, d, J = 1.6 Hz), 6.87-6.93 (1H, m), 7.00 (1H, d, J = 12.8Hz), 7.41-7.50 (1H, m), 7.75 (1H, d, J = 8.0Hz), 7.94 (1H, s ), 8.82 (1H, s), 8.95 (1H, s)

Example 3
3- [2-Fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo-1,2,3,4-tetrahydrothieno [3,4 d] methyl pyrimidine-5-carboxylate 4- {3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] ureido} thiophene-2,3-dicarboxylic acid A methanol solution (3.48 g) of 28% sodium methoxide was added to a suspension of dimethyl (10.0 g) in tetrahydrofuran (40 g), stirred at room temperature for 3 hours, and acetic acid (1.30 g) was added. The reaction mixture was concentrated under reduced pressure. Methanol was added to the residue, and water was further added. After filtering the suspension, the obtained solid was dried to obtain the title compound (8.58 g).
¹ H-NMR (DMSO-d ₆ ) δ ppm: 3.79 (3H, s), 3.81 (3H, s), 3.84 (3H, s), 4.95 (2H, s), 6.88-6.94 (1H, m), 7.08 (1H, d, J = 11.6Hz), 7.19-7.23 (2H, m), 7.44-7.53 (1H, m), 11.62 (1H, s)

Example 4
Dimethyl 4- (phenoxycarbonylamino) thiophene-2,3-dicarboxylate potassium carbonate (9.38 kg), water (49 kg), tetrahydrofuran (82 kg), dimethyl 4-aminothiophene-2,3-dicarboxylate hydrochloride (16 4 kg) of the reaction mixture was stirred for 40 minutes and then phenyl chloroformate (10.1 kg) was added at 11-21 ° C. The reaction mixture was stirred for 30 minutes, and then the aqueous layer was removed to obtain a tetrahydrofuran solution of the title compound.

Example 5
4- {3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] ureido} thiophene-2,3-dicarboxylate dimethyl 4-obtained in Example 4 To a tetrahydrofuran solution of dimethyl (phenoxycarbonylamino) thiophene-2,3-dicarboxylate, 2-fluoro-5-[(2,3-difluoro-6-methoxyphenyl) methoxy] -4-methoxyaniline (17.0 kg), Tetrahydrofuran (8.5 kg) and triethylamine (1.1 kg) were added, and the mixture was stirred at 50 ° C. for 3.5 hours to obtain a tetrahydrofuran solution of the title compound.

Example 6
3- [2-Fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo-1,2,3,4-tetrahydrothieno [3,4 d] pyrimidine-5-carboxylic acid tetrahydrofuranate 4- {3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] ureido} obtained in Example 5 Methanol (41 kg) and water (47 kg) are added to a tetrahydrofuran solution of dimethyl thiophene-2,3-dicarboxylate, a 7.3% lithium hydroxide aqueous solution (80.1 kg) is added at 11-13 ° C., and 90 ° C. at 11 ° C. Stir for minutes. Acetic acid (11.4 kg) was added to the reaction mixture at 9 to 16 ° C., and acetic acid (13.0 kg) was further added at 29 to 31 ° C. Seed crystals were added to the reaction mixture, and the mixture was stirred at the same temperature for 30 minutes. Water (34 kg) was added to the suspension and stirred at 30 ° C. for 40 minutes. The suspension was stirred at 4-9 ° C. for 90 minutes. After the suspension was filtered, the obtained solid was washed with a mixed solution of methanol (54 kg) and water (68 kg) to give wet crystals of the title compound (31.64 kg, Net amount (compound (A) free form equivalent)) 26 0.7 kg) was obtained.
A portion of the wet crystals of the title compound was dried under reduced pressure at an external temperature of 60 ° C., and ¹ H-NMR, HPLC and powder X-ray diffraction were measured on the obtained dry crystals of the title compound.
¹ H-NMR (DMSO-d ₆ ) δ ppm: 1.68-1.82 (3H, m), 3.53-3.65 (3H, m), 3.80 (3H, s), 3.81 (3H, s), 4.94-4.98 (2H , m), 6.87-6.94 (1H, m), 7.13 (1H, d, J = 11.2Hz), 7.25 (1H, d, J = 7.2Hz), 7.39 (1H, s), 7.43-7.52 (1H, m), 11,99 (1H, s), 14.53 (1H, s)

The HPLC measurement of the dry crystals obtained in Example 6 was performed under the following conditions.
HPLC measurement condition column: Inertsil (registered trademark) C8-3 (particle diameter 3 μm, inner diameter 3 mm, length 15 cm), GL Science Inc. column temperature: 40 ° C.
Mobile phase A: 0.002 mol / L potassium dihydrogen phosphate solution (pH 3.6)
Mobile phase B: Acetonitrile mobile phase feeding: The concentration ratio is controlled by changing the mixing ratio of mobile phase A and mobile phase B as shown in Table 1.

Flow rate: 0.5 mL per minute
Area measurement range: 0.002 mol / L Potassium dihydrogen phosphate solution (pH 3.6) / acetonitrile-derived peak was excluded, and 65 minutes after the start of analysis.
Chemical purity (HPLC): 98.5%

The powder X-ray diffraction of the dry crystal obtained in Example 6 was measured under the following conditions.
Powder X-ray diffractometer: X'Pert Pro MPD (Spectris Panalytical Division)
Reflection method: CuKα line, tube voltage 45 kV, tube current 40 mA
The obtained diffractogram is shown in FIG. 1 and typical peaks (2θ (°)) are shown in Table 2.

In powder X-ray diffraction, the 2θ value and the overall diffraction pattern are important when identifying the identity of crystals due to the nature of the data. It is generally known that the relative intensity in an X-ray diffraction pattern can vary depending on sample conditions and measurement conditions. Note that the 2θ value of the diffraction pattern by powder X-ray diffraction may slightly vary depending on the sample conditions and measurement conditions.

Example 7
3- [2-Fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo-1,2,3,4-tetrahydrothieno [3,4 d] pyrimidine-5-carboxylic acid (2-hydroxyethyl) trimethylammonium 3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo -1,2,3,4-Tetrahydrothieno [3,4-d] pyrimidine-5-carboxylic acid Wet crystals of tetrahydrofuran hydrate (107.7 g, Net amount (compound (A) free form equivalent) 83.4 g)) , Tetrahydrofuran (345 mL) and water (275 mL) were added 50% aqueous choline bicarbonate solution (60 mL) at 55 ° C. The resulting solution was filtered and a mixture of tetrahydrofuran (34 mL) and water (31 mL) was added. To the reaction mixture was added 2-propanol (296 mL) at 58 ° C. Seed crystals were added to the reaction mixture, and the mixture was stirred at 45 ° C. for 3 hours. 2-Propanol (887 mL) was added to the suspension at the same temperature and stirred for 1 hour. The suspension was stirred at 20-30 ° C for 1 hour and stirred at 3-5 ° C for 1 hour. After filtering the suspension, the obtained solid was dried to obtain the title compound (89.3 g).
¹ H-NMR (DMSO-d ₆ ) δ ppm: 3.10 (9H, s), 3.37-3.43 (2H, m), 3.78 (3H, s), 3.81 (3H, s), 3.76-3.88 (2H, m ), 4.93-4.98 (2H, m), 5.53 (1H, s), 6.44 (1H, s), 6.87-6.94 (1H, m), 7.05 (1H, d, J = 11.6Hz), 7.11 (1H, d, J = 7.6Hz), 7.43-7.52 (1H, m), 11.15 (1H, s)

Example 8
3- [2-Fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo-1,2,3,4-tetrahydrothieno [3,4 d] pyrimidine-5-carboxylic acid (2-hydroxyethyl) trimethylammonium 3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo -1,2,3,4-tetrahydrothieno [3,4-d] pyrimidine-5-carboxylic acid wet crystals of tetrahydrofuran hydrate (11.09 g, amount of Net (compound (A) free form equivalent) 10.0 g) , Methanol (80 mL), water (10 mL), diisopropylamine (1.99 g) was stirred at room temperature for 10 minutes. The resulting solution was filtered and methanol (20 mL) was added to the filtrate. A 49% aqueous solution of choline acetate (7.2 g) and water (10 mL) was added to the reaction mixture at 55-60 ° C., and the mixture was stirred at 40-55 ° C. for 2 hours. The reaction mixture was stirred at room temperature for 1 hour and then stirred for 2 hours under ice cooling. After filtering the suspension, the obtained solid was dried to obtain the title compound (11.3 g).

Example 9
3- [2-Fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo-1,2,3,4-tetrahydrothieno [3,4 d] pyrimidine-5-carboxylic acid (2-hydroxyethyl) trimethylammonium 3- [2-fluoro-5- (2,3-difluoro-6-methoxybenzyloxy) -4-methoxyphenyl] -2,4-dioxo -1,2,3,4-tetrahydrothieno [3,4-d] pyrimidine-5-carboxylic acid wet crystals of tetrahydrofuran hydrate (1.15 g, amount of Net (compound (A) free form equivalent) 1.00 g) , Choline chloride (0.30 g), triethylamine (274 μL), tetrahydrofuran (4.3 mL), and water (4.3 mL) were stirred at 55 ° C. for 20 minutes. Hydrofuran (430 μL), water (380 μL) and 2-propanol (3.5 mL) were added. Seed crystals were added to the reaction mixture at 45 ° C., and 2-propanol (9.6 mL) was added at 40 to 45 ° C. The reaction mixture was stirred at 0 ° C. for 4 hours. After filtering the suspension, the obtained solid was dried to obtain the title compound (0.90 g).

  For example, by performing the operations of Examples 4 to 6, compound (A) can be obtained in a yield of 97% and chemical purity (HPLC) of 98.5%. As described above, the series of production methods via the compound (D) is extremely useful as an industrial production method because the compound (A) or a salt thereof useful as a pharmaceutical can be produced with high yield and high purity. I know that there is.

  According to the present invention, prostatic hypertrophy, uterine fibroids, endometriosis, uterine fibroma, precocious puberty, amenorrhea, premenstrual syndrome, dysmenorrhea, polycystic ovary syndrome, lupus erythematosus, hirsutism, Preventive or therapeutic agent for sex hormone dependent diseases such as dwarfism, sleep disorder, acne, baldness, Alzheimer's disease, infertility, irritable bowel syndrome, prostate cancer, uterine cancer, ovarian cancer, breast cancer, pituitary tumor In addition, a fused heterocyclic derivative or a salt thereof useful as a reproductive regulator, a contraceptive, an ovulation inducer, a sex hormone dependent cancer postoperative recurrence preventive agent, or the like can be produced with high yield and high purity.

1 is a powder X-ray diffraction pattern of the compound (A) tetrahydrofuranate obtained in Example 6. FIG. The vertical axis represents the X-ray diffraction intensity, and the horizontal axis represents the diffraction angle (2θ (°)).

Claims (12)

Formula (A):
A method for producing a compound represented by the formula or a salt thereof, wherein the method comprises the following steps:
Step 1:
Formula (B):
(Wherein R ¹ and R ² are the same or different C _1-6 alkyl groups) or a salt thereof in a mixed solvent of either a cyclic ether or a nitrile solvent and water , In the presence of an inorganic base, the general formula (C):
(Wherein R ³ is a hydrogen atom, a halogen atom, a C _1-6 alkyl group or a nitro group, and X is a chlorine atom or a bromine atom). ):
(Wherein R ¹ , R ² and R ³ have the same meaning as described above),
Step 2:
The compound represented by the general formula (D) is represented by the formula (E):
And a compound represented by the general formula (F):
(Wherein R ¹ and R ² have the same meaning as described above);
Step 3:
A step of producing a compound represented by the formula (A) by intramolecular cyclization of the compound represented by the general formula (F) and hydrolysis of R ² ; and step 4:
A step of converting the compound represented by the formula (A) into a salt thereof as necessary. The production method according to claim 1, wherein R ¹ and R ² are a methyl group or an ethyl group, R ³ is a hydrogen atom, and X is a chlorine atom. The equivalent of compound (C) is 0.8 to 1.1 equivalents relative to compound (B). 2. The production method according to 2. The manufacturing method in any one of Claims 1-3 whose reaction temperature of the process 1 is 0-30 degreeC. The manufacturing method in any one of Claims 1-4 with which process 2 is performed in presence of a base. In which said base is N, is selected from the group consisting of N- dimethylaminopyridine and triethylamine process of claim 5 wherein. The equivalent of a compound (B) is 1.2 equivalent with respect to a compound (E), The description in any one of Claims 1-6 The manufacturing method described. The manufacturing method in any one of Claims 1-7 with which process 3 is performed in presence of an inorganic base or a metal alkoxide . In which inorganic bases or metal alkoxide is selected from the group consisting of lithium hydroxide and sodium methoxide, manufacturing method of claim 8. The manufacturing method in any one of Claims 1-9 whose reaction temperature of the process 3 is 0-20 degreeC. The manufacturing method in any one of Claims 1-10 whose salt of the compound represented by Formula (A) is a choline salt. The production method according to claim 11 , wherein the reagent used for the conversion to a choline salt is selected from the group consisting of choline hydroxide, choline bicarbonate, choline chloride and choline acetate.