WO2004103979A1 - N-(2-アミノ-4,6-ジクロロピリミジン-5-イル)ホルムアミドの製造方法 - Google Patents
N-(2-アミノ-4,6-ジクロロピリミジン-5-イル)ホルムアミドの製造方法 Download PDFInfo
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- WO2004103979A1 WO2004103979A1 PCT/JP2004/007224 JP2004007224W WO2004103979A1 WO 2004103979 A1 WO2004103979 A1 WO 2004103979A1 JP 2004007224 W JP2004007224 W JP 2004007224W WO 2004103979 A1 WO2004103979 A1 WO 2004103979A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/48—Two nitrogen atoms
Definitions
- the present invention relates to a method for producing N- (2-amino-4,6-dichropyrimidin-5-yl) formamide, which is useful as an intermediate for the synthesis of antiviral agents.
- a series of purine nucleoside derivatives represented by the compound [hereinafter also referred to as compound (VI)] are known to be useful as antiviral agents (Nucleosides, Nucleotides & Nucleic Acids, 2000, Vol. 19 (1 & 2), p. 297-327).
- compound (V) As useful synthetic intermediates of these purine nucleoside derivatives, a compound of the formula (V):
- N- (2-amino-4,6-dichropyrimidine-15-yl) formamide represented by the following formula is known (see Patent Documents 1 and 2).
- Japanese Patent Application Laid-Open No. 9-50812 discloses a method represented by the formula (I) as shown in the following scheme. Reacts with the Vilsmeier reagent of formula (VII) To produce a compound represented by the formula (Ilia), hydrolyze a compound represented by the formula (Ilia) with hydrochloric acid, produce a compound represented by the formula (IVa), and then convert this compound with phosphoric acid.
- a method for producing N- (2-amino-4,6-dichloropyrimidine-15-yl) formamide by hydrolysis is disclosed.
- a compound represented by the formula (I) is chlorinated using a chlorinating agent in the presence of an amide represented by the formula (Ila).
- a compound represented by the formula (IVb) is produced and reacted with an aliphatic carboxylic acid represented by the formula (VIII) such as propionic acid to give N- (2-amino 4,6-dichloropyrimidine).
- 5-yl A method for producing formamide has been disclosed.
- R 2 represents a 5- or 6-membered heterocycloalkyl group having a substituent on a hetero atom in some cases, or —NR 3 R 4 (R 3 and R 4 are the same or different and each represent ( ⁇ to ( ⁇ an alkyl group or a benzyl group)), and R 6 is a C i Cs alkyl group which is branched or branched. Or a C 3 -C 6 cycloalkyl group.]
- This method also requires two steps from the compound represented by the formula (I), and the total yield is as low as 55%. Furthermore, the use of a large amount of the aliphatic carboxylic acid represented by the formula (VIII) increases the cost and is not an industrially advantageous method.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a useful synthetic intermediate of an antiviral agent, N- (2-amino-1,4,6-dichrolic pyrimidine-15). —Yl) It is an object of the present invention to provide a method capable of producing formamide easily and with good yield in an industrially advantageous manner.
- the present inventors have conducted intensive research to solve the above-mentioned problems. As a result, the present invention has been completed. That is, the present invention is as follows.
- a compound represented by the following formula (hereinafter also referred to as compound (I)) or a salt thereof or a hydrate thereof is represented by the formula (II):
- R 1 and R 2 are the same or different and are each optionally substituted lower alkyl group, optionally substituted lower cycloalkyl group, optionally substituted aryl group or substituted Or a nitrogen atom to which R 1 and R 2 bind. It may form an aliphatic hetero ring which may be substituted together with an element atom. (Hereinafter also referred to as compound (II)) and a chlorinating agent to give a compound of formula (III):
- step (III)] [hereinafter also referred to as step (a)];
- step (c) a step of reacting compound (IV) at a pH higher than 3.5 and at a pH of 5 or less (hereinafter, also referred to as step (c));
- compound (V) [Hereinafter referred to as compound (V)] or a salt thereof.
- step (b) The production method according to (1), wherein in step (b), the reaction mixture in step (a) is mixed with water to adjust the pH to 3 or less, and the reaction is carried out.
- step (b) The production method according to (2), wherein in step (b), the pH is adjusted by further adding a base.
- the base added in the step (b) is at least one selected from the group consisting of aqueous ammonia, ammonium carbonate, ammonium hydrogencarbonate, potassium carbonate, sodium hydrogencarbonate, sodium carbonate, sodium hydroxide, and sodium hydroxide.
- the production method according to the above (3) which is one base.
- step (c) the base is added to the reaction mixture in the step (b) to adjust the pH to a value higher than 3.5 and a pH of 5 or less.
- the base added in the step (c) is at least one selected from the group consisting of aqueous ammonia, ammonium carbonate, ammonium hydrogencarbonate, potassium carbonate, sodium hydrogencarbonate, sodium carbonate, sodium hydroxide, and a water-soluble room.
- the production method according to the above (5) which is one base.
- step (a) and the step (b) and / or the step (b) and the step (c) are performed by a component reaction. Manufacturing method as described.
- the compound (I) (2,5-diamino-4,6-dihydroxypyrimidine) as a raw material can be produced to a compound (V) by a one-port reaction without taking out an intermediate product. It can be shortened and simple. Also, the yield will be dramatically improved.
- Examples of the “lower alkyl group” of the “optionally substituted lower alkyl group” represented by R 1 and R 2 include linear or branched alkyl having 1 to 8 carbon atoms, for example, methyl, Ethyl, propyl, isopropyl, butyl, isoptyl, sec-butyl, tert-butyl, pentyl, isopentyl, sec-pentyl, tert-pentyl, neopentyl, hexyl, heptyl, octyl, etc., and are preferable. Is, for example, methyl or ethyl.
- a cycloalkyl group having 3 to 8 carbon atoms for example, cyclopropyl, cyclobutyl, cyclobutyl, cyclopentyl, cyclohexyl And cycloheptyl, cyclooctyl and the like, preferably cyclopentyl and cyclohexyl.
- the “aryl group” of the “aryl group which may be substituted” for R 1 and R 2 includes, for example, phenyl, 1-naphthyl, 2-naphthyl and the like, and preferably phenyl and the like.
- the alkyl moiety is a ⁇ lower alkyl group '' as defined above, and the aryl moiety is exemplified above.
- An aralkyl group which is an "aryl group” is mentioned, for example, benzyl, 1-phenyl, 2-phenyl, 3-phenylpropyl, 1-naphthylmethyl and the like, preferably benzyl and the like.
- the “aliphatic hetero atom” which may be formed together with the nitrogen atom to which R 1 and R 2 are bonded includes, for example, a hetero atom selected from an oxygen atom, a sulfur atom and a nitrogen atom in addition to a carbon atom.
- a 5- or 6-membered aliphatic heterocyclic ring containing 1 or 2 such as, for example, pyridine, piperidine, morpholine, thiomorpholine, piperazine and the like, preferably piperidine and the like.
- Examples of the substituent which may be substituted by the above “lower alkyl group”, “lower cycloalkyl group”, “aryl group”, “aralkyl group” and “aliphatic hetero group” include, for example, a lower alkyl group (as described above). Examples are the same as those defined above, provided that they are not a substituent of a lower alkyl group.), A halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom), and the like are preferable. Represents a methyl, ethyl, chlorine atom or the like.
- the number of the substituents is not particularly limited, is preferably 1 to 3, and may be the same or different.
- R 1 and R 2 include methyl, ethyl, phenyl, benzyl, piperidine and the like, with methyl being particularly preferred.
- Compound (I) and compound (V) may be in the form of a salt.
- Such salts include, for example, mineral acids (eg, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, etc.), organic acids
- (I) or a salt thereof may be a hydrate.
- the production method of the present invention is shown in the following scheme.
- a step (a) of reacting compound (I) with compound ( ⁇ ) and a chlorinating agent to produce compound ( ⁇ ); reacting compound (III) at pH 3 or less A method for producing a compound (V), comprising: a step (b) of producing the compound (IV); and a step (c) of reacting the compound (IV) at a pH higher than 3.5 and a pH of 5 or less.
- the step (a) and the step (b) and / or the step (b) and the step (c) can be performed in a one-pot reaction, and the number of steps can be reduced, so that the method can be performed easily.
- one-pot reaction A the reaction of several consecutive, without isolation of the intermediate, further c refer to reactions carried out in the same reaction vessel, stepwise in step (b) and step (c)
- the compound (III) can be converted into compound (V) in good yield by adjusting the pH of the reaction.
- the reason for this is as follows.
- the reaction at a pH of 3 or less in the step (b) accelerates the deprotection of the substituent (IX) at the 2-position of the compound (III), and the compound (III) ) Is transferred to compound (IV), and then, in step (c), 11 is adjusted to a range of higher than 3.5 to 5 or less, whereby the 5-position substitution group (IX) of compound (IV) of compound (IV) is reacted. It is considered that the deprotection reaction proceeds and compound (V) can be produced in high yield.
- Step (a) is, for example, a step of reacting compound (I) with compound (II) and a chlorinating agent in a solvent to produce compound (III).
- step (a) the order of addition of the reagents is not particularly limited.
- compound (II) is added to a mixture of compound (I) and a chlorinating agent previously charged in a solvent; Add a chlorinating agent to the mixture of compound (I) and compound (II) Alternatively, compound (II) may be reacted with a chlorinating agent in a solvent to prepare Vilsmeier reagent, and then added to compound (I) charged in the solvent.
- the compound (II) used in the step (a) is not particularly limited as long as it is a formamide defined by the above R 1 and R 2.
- N, N-dimethylformamide, N-methyl-N —Phenylformamide, N-formylpiperidine and the like, and N, N-dimethylformamide is preferred.
- the amount of compound (II) used is preferably 2 mol to 10 mol, more preferably 2 mol to 5 mol, per 1 mol of compound (I). If the amount of the compound (II) is less than this range, the reaction efficiency tends to decrease, and if it is used beyond this range, no further effect is obtained and there is a tendency to be economically disadvantageous. Not so good.
- the chlorinating agent used in step (a) is not particularly limited, and includes, for example, oxychloride phosphorus, thionyl chloride, sulfuryl chloride, phosphorus trichloride, phosphorus pentachloride, and the like. No.
- the amount of the chlorinating agent to be used is preferably 2 mol to 10 mol, more preferably 4 mol to 5.5 mol, per 1 mol of compound (I). If the amount of the chlorinating agent is less than this range, the reaction efficiency tends to decrease, and if the chlorinating agent is used beyond this range, no further effect is obtained, and it tends to be economically disadvantageous. Absent.
- the solvent used in step (a) may be any solvent that does not inhibit the reaction, and includes, for example, ethers such as tetrahydrofuran (THF), 1,4-dioxane and 1,2-dimethoxetane; benzene Aromatic hydrocarbons such as hexane, toluene and xylene; aliphatic hydrocarbons such as heptane, hexane and octane; halogenated hydrocarbons such as dichloromethane, chloroform, monochlorobenzene and dichlorobenzene. They can be used alone or in combination. When a mixed solvent is used, they may be mixed at an arbitrary ratio.
- ethers such as tetrahydrofuran (THF), 1,4-dioxane and 1,2-dimethoxetane
- benzene Aromatic hydrocarbons such as hexane, toluene and xylene
- the amount of the solvent to be used is generally 1 L-20 L, more preferably 5 L-10 L, per 1 kg of compound (I).
- the reaction temperature in step (a) is usually in the range of 50 ° C; to 120 ° C; preferably 80 ° C: to 100 ° C.
- the reaction time depends on the reagents used and the reaction temperature, but is usually completed in 5 to 15 hours.
- the compound (III) produced in the step (a) can be isolated and purified by a conventional method. However, since the step is shortened, the compound (III) after the completion of the step (a) is usually used without isolation.
- the reaction mixture containing is directly subjected to step (b), and is performed in a so-called one-pot reaction.
- Step (b) is a step of producing compound (IV) by reacting compound (III) at pH 3 or less.
- the method for adjusting the reaction solution to pH 3 or less in step (b) is not particularly limited.
- the reaction of compound (III) with an acidic aqueous solution adjusted to pH 3 or less eg, hydrochloric acid, sulfuric acid, phosphoric acid, carboxylic acids, etc.
- an acidic aqueous solution adjusted to pH 3 or less eg, hydrochloric acid, sulfuric acid, phosphoric acid, carboxylic acids, etc.
- the reaction mixture of step (a) containing compound (III) is mixed with water to decompose the chlorinating agent, resulting in strong acidity of about pHO.
- a base is added to the resulting mixture as needed to adjust the reaction solution to pH 3 or less.
- step (a) If the reaction mixture in step (a) is mixed with water, water is added to the reaction mixture at 15 ° C to 40 ° C after the reaction in step (a), so that the chlorinating agent is not excessively decomposed. It is preferable to add dropwise or to drop the reaction mixture into water at 15 ° C to 40 ° C. In order to sufficiently decompose the chlorinating agent, it is preferable to stir at a temperature of 15 ° C. to 35 ° C. for about 0.5 to 2 hours after mixing.
- the amount of water to be mixed is not particularly limited, but is preferably in the range of 200 mL to 40 OmL based on 1 mol of the chlorinating agent used in step (a).
- step (b) it is preferable to adjust the pH during the reaction by adding an appropriate amount of a base in order to suppress the hydrolysis of the chloro group present in the pyrimidine ring of the compound (III).
- a base include at least one of ammonia water, ammonium carbonate, ammonium hydrogen carbonate, potassium carbonate, sodium hydrogen carbonate, sodium carbonate, sodium hydroxide, potassium hydroxide, and the like. Ammonia carbonate or ammonia water is preferred because good yields are obtained.
- the range of the pH during the reaction is usually pH 3 or less, preferably pH 2 or less. If the pH during the reaction in step (b) is higher than pH 3, deprotection of the substituent (IX) at the 2-position of the pyrimidine ring in compound (III) will be delayed, and the yield will decrease due to the increase of by-products It is not preferable because of the tendency.
- the lower limit of the pH is not particularly limited, but is preferably pH 0.5 or more, and more preferably pH 1.0 or more. When the pH is lower than 0.5, side reactions such as hydrolysis of the chloro group present in the pyrimidine ring of the compound (III) are apt to proceed, which is not preferable.
- the reaction temperature of the step (b) is usually in the range of 20 ° C to 100 ° C (preferably, 40 ° C to 60 ° C.
- the reaction time depends on the reaction temperature and the like. Hours to 3 hours.
- the compound (IV) produced in the step (b) can be isolated and purified by a conventional method. However, in order to shorten the process, the compound (IV) after the completion of the step (b) is usually used without isolation.
- the reaction mixture containing the mixture is directly subjected to step (c) to carry out a so-called one-port reaction.
- Step (c) is, for example, a step of producing compound (V) by reacting compound (IV) at a pH higher than pH 3.5 and pH 5 or lower after step (b).
- step (c) there is no particular limitation on the method for adjusting the pH during the reaction to be higher than pH 3.5 and lower than or equal to pH 5, for example, by adjusting the pH of the compound (IV) to be higher than pH 3.5 and adjusted to pH 5 or lower.
- An example is a method of reacting with an aqueous solution (for example, hydrochloric acid, sulfuric acid, phosphoric acid, carboxylic acid, etc.). Since the reaction can be performed in a one-pot reaction, an appropriate amount of the reaction mixture in the step (b) containing the compound (IV) is used.
- a method of adjusting pH by adding a base is preferred.
- step (c) the same bases as those exemplified in step (b) can be mentioned, and since a good yield can be obtained, ammonium carbonate can be used. Or ammonia water is preferred.
- the base used in step (C) is
- the same base as that used in (b) may be used, or a different base may be used.
- the lower limit of the pH during the reaction in step (c) is preferably higher than pH 3.5, and more preferably pH 3.8 or higher.
- the upper limit is preferably pH 5 or less, more preferably pH 4.2 or less.
- the reaction temperature for step (c) is usually 50. C. to 100.degree. C., preferably 70.degree. C. to 90.degree.
- the reaction time depends on the reaction temperature, etc., but is usually completed in 5 to 10 hours.
- the compound (V) produced in the step (c) can be isolated and purified by a conventional method, and is not particularly limited, but is preferably performed by the following method.
- a precipitate can be obtained by cooling and, if necessary, filtering out a precipitate that precipitates and washing with water or the like.
- the precipitate is considered to be an acid addition salt of compound (V).
- aqueous alkaline solution for example, aqueous ammonia, aqueous potassium carbonate, aqueous sodium carbonate, aqueous ammonium carbonate, etc.
- aqueous alkaline solution for example, aqueous ammonia, aqueous potassium carbonate, aqueous sodium carbonate, aqueous ammonium carbonate, etc.
- a base for example, potassium carbonate, sodium carbonate, ammonium carbonate, or the like
- the above-mentioned alkaline aqueous solution is added to the reaction solution to make the reaction solution basic, and then the compound (V) is obtained by filtration, washing with water and the like. ) May be isolated and purified.
- Compound (I) which is a raw material of the production method of the present invention, is prepared by a known method, for example, A product produced according to the method described in Patent Document 2 can be used, and a commercially available product can also be used.
- Compound (V) can be derived into compound (VI), which is useful as an antiviral agent, for example, according to the method described in Non-patent Document 1 described above.
- Example 1 (b) The reaction mixture of Example 1 (a) was cooled to 15-20 ° C and water (100 ml) was added dropwise between 15-40 ° C. After the dropwise addition, the mixture was stirred for 0.5 to 1 hour at 20 to 25 ° C., and the mixture was allowed to stand for liquid separation. The pH of the aqueous layer was adjusted to about 1 with 28% aqueous ammonia (about 30 g), and the temperature was raised to 50 to 55 ° C, followed by a reaction for about 3 hours.
- the reaction was carried out in the same manner as in Example 1. After completion of the reaction, the mixture was cooled to 5 to 15 ° C, and the reaction mass; pH was adjusted to about 8 to 9 with 28% aqueous ammonia (about 20 g). The temperature was raised to 40 to 45 ° C, and the mixture was stirred for 1 hour. The precipitate was filtered, washed with water (120 ml), and dried in a water bath at 70 ° C under reduced pressure to give the title compound (7.58 g, yield 70.7%).
- the filtration residue was suspended in a 10% aqueous carbonated lime solution and stirred at 20 to 25 ° C for about 1.5 hours. After completion of the stirring, the mixture was filtered, washed with water (50 ml) and dried to obtain the title compound (2.51, yield 47.7%).
- the production method of the present invention is a method for producing N- (2-amino-4,6-dichloropyrimidine-15-yl) formamide [compound (V)], which is an intermediate for synthesis of antiviral agent, more industrially than the conventional method. It is a method that can be advantageously produced.
- This application is based on a patent application No. 2003-148358 filed in Japan, the contents of which are incorporated in full herein.
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JP2005506404A JPWO2004103979A1 (ja) | 2003-05-26 | 2004-05-20 | N−(2−アミノ−4,6−ジクロロピリミジン−5−イル)ホルムアミドの製造方法 |
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JP2003148358 | 2003-05-26 | ||
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102127022A (zh) * | 2010-12-30 | 2011-07-20 | 苏州开元民生科技股份有限公司 | 2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
CN105949133A (zh) * | 2016-07-14 | 2016-09-21 | 吉林普瑞特生物科技有限公司 | 一种2-氨基-4,6-二氯-5-甲酰氨基嘧啶的合成方法 |
CN115536595A (zh) * | 2022-11-29 | 2022-12-30 | 苏州开元民生科技股份有限公司 | 一种2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
CN117050024A (zh) * | 2023-10-13 | 2023-11-14 | 苏州开元民生科技股份有限公司 | 一种2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
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JPH07300466A (ja) * | 1994-04-27 | 1995-11-14 | Lonza Ag | N−(2−アミノ−4,6−ジクロロピリミジン−5−イル)フォルムアミドおよびその製造方法 |
JPH09508412A (ja) * | 1994-02-04 | 1997-08-26 | ザ、ウェルカム、ファンデーション、リミテッド | クロロピリミジン中間体 |
JP2000191647A (ja) * | 1998-12-21 | 2000-07-11 | Lonza Ag | N―(アミノ―4,6―ジハロピリミジン)ホルムアミド類の製造方法 |
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2004
- 2004-05-20 WO PCT/JP2004/007224 patent/WO2004103979A1/ja active Application Filing
- 2004-05-20 JP JP2005506404A patent/JPWO2004103979A1/ja active Pending
Patent Citations (3)
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JPH09508412A (ja) * | 1994-02-04 | 1997-08-26 | ザ、ウェルカム、ファンデーション、リミテッド | クロロピリミジン中間体 |
JPH07300466A (ja) * | 1994-04-27 | 1995-11-14 | Lonza Ag | N−(2−アミノ−4,6−ジクロロピリミジン−5−イル)フォルムアミドおよびその製造方法 |
JP2000191647A (ja) * | 1998-12-21 | 2000-07-11 | Lonza Ag | N―(アミノ―4,6―ジハロピリミジン)ホルムアミド類の製造方法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102127022A (zh) * | 2010-12-30 | 2011-07-20 | 苏州开元民生科技股份有限公司 | 2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
CN105949133A (zh) * | 2016-07-14 | 2016-09-21 | 吉林普瑞特生物科技有限公司 | 一种2-氨基-4,6-二氯-5-甲酰氨基嘧啶的合成方法 |
CN115536595A (zh) * | 2022-11-29 | 2022-12-30 | 苏州开元民生科技股份有限公司 | 一种2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
CN117050024A (zh) * | 2023-10-13 | 2023-11-14 | 苏州开元民生科技股份有限公司 | 一种2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
CN117050024B (zh) * | 2023-10-13 | 2024-01-05 | 苏州开元民生科技股份有限公司 | 一种2-氨基-4,6-二氯-5-甲酰胺基嘧啶的合成方法 |
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