WO2011010677A1 - Process for producing inorganic acid salt of 2-aminobutylamide - Google Patents
Process for producing inorganic acid salt of 2-aminobutylamide Download PDFInfo
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- WO2011010677A1 WO2011010677A1 PCT/JP2010/062274 JP2010062274W WO2011010677A1 WO 2011010677 A1 WO2011010677 A1 WO 2011010677A1 JP 2010062274 W JP2010062274 W JP 2010062274W WO 2011010677 A1 WO2011010677 A1 WO 2011010677A1
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- aminobutyramide
- inorganic acid
- acid salt
- inorganic
- aminobutyronitrile
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/06—Preparation of carboxylic acid amides from nitriles by transformation of cyano groups into carboxamide groups
Definitions
- the present invention relates to a method for producing a 2-aminobutyramide inorganic acid salt (5) having high purity and excellent quality from 2-hydroxybutyronitrile (1) economically and simply in a high yield.
- Highly pure and excellent quality 2-aminobutyramide inorganic acid salt is very useful as a raw material for pharmaceutical synthesis.
- X is an inorganic acid anion.
- ⁇ -amino acid amide using cyanohydrin As a production method of ⁇ -amino acid amide using cyanohydrin as a starting material, a production method via ⁇ -amino nitrile is known, and ⁇ -amino nitrile is known to have a Strecker reaction synthesized from cyanohydrin and ammonia or ammonium salt. It has been.
- a method for producing an ⁇ -amino acid amide using ⁇ -amino nitrile as a starting material an ⁇ -amino acid amide is produced by forming 5-oxazolidinone from ⁇ -amino nitrile as a reaction intermediate and then hydrolyzing the intermediate.
- a synthesis method for obtaining see, for example, Patent Document 1). However, since these methods require the reaction to be carried out under anhydrous conditions, it is necessary to carry out the reaction by removing water produced as a by-product by the Strecker reaction, which requires a complicated process and apparatus.
- ⁇ -amino nitrile is hydrated by reaction with a base and a ketone in an aqueous medium, an inorganic acid is mixed into the resulting ⁇ -amino acid amide-containing liquid, and then the resulting ⁇ -amino acid amide inorganic acid salt is formed.
- a method for separating and recovering the liquid has been reported (see, for example, Patent Document 5). This method eliminates the need for distillation and concentration.
- 2-aminobutyramide inorganic acid salt with high water solubility an ⁇ -amino acid amide inorganic acid is produced due to the influence of water contained in the reaction solution during crystal separation. A loss of salt to the filtrate occurs and causes a problem in yield.
- the present invention is to provide an economical method capable of producing a 2-aminobutyramide inorganic acid salt (5) useful as a pharmaceutical raw material or the like in a high yield.
- the present invention relates to a process for producing 2-aminobutyramide inorganic acid salt (5) from 2-hydroxybutyronitrile (1) through amination and Schiff basification.
- the present inventors have a highly soluble 2-aminobutyramide inorganic acid salt (highly water-soluble) without performing a distillation concentration step that causes by-products.
- the loss to the filtrate in the separation operation of 5) can be reduced, and the mixture of inorganic salts such as ammonia inorganic acid salt, which shows the same solvent solubility as 2-aminobutyramide inorganic acid salt, can also be reduced.
- 2-hydroxybutyronitrile (1) is reacted with ammonia, and the reaction solution containing 2-aminobutyronitrile (2) is directly or directly added to the reaction solution.
- a reaction solution containing 2-aminobutyronitrile (2) obtained by adding an inorganic strong base aqueous solution to separate two layers and dehydrating or degassing under reduced pressure to remove ammonia, In the presence of a strong inorganic base and a ketone solvent, the reaction is carried out under the condition that the amount of water with respect to 2-aminobutyronitrile (2) is 3 times mol or less, and 2-aminobutyronitrile (2) obtained in step (A) is obtained.
- the water in the reaction solution is contained only in an equimolar amount by-produced in the aminonitrile formation. It is possible to further reduce the amount of water by performing the operation of adding two layers to separate the two layers. On the other hand, when ammonia water is used, the amount of water in the reaction solution increases. However, if the amount of water is too much, the amount of water can be reduced by adding an inorganic strong base to the reaction solution and separating the two layers. Can be reduced.
- step (B) when synthesizing 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4) from 2-aminobutyronitrile (2) in step (B), the amount of water in the reaction solution
- step (C) a product containing 2-aminobutyramide Schiff base (3) as a main component is obtained, and further by using this product, in step (C), a small amount of water It has been found that it can be converted to the 2-aminobutyramide inorganic acid salt (5) at a high rate and in a high yield with an increase in the amount and, in some cases, a decrease in water accompanying the hydrolysis reaction of the Schiff base.
- the solubility of the 2-aminobutyramide inorganic acid salt (5) in the ketone solvent is lower as the amount of water in the mother liquor is smaller. Therefore, by reducing the water content in the mother liquor, the loss of 2-aminobutyramide inorganic acid salt (5) to the filtrate in the crystal separation step can be reduced.
- 2-aminobutyronitrile is hydrolyzed to 2-aminobutyramide under basic conditions in the presence of conventional water and ketone solvents, and then neutralized with acid to give 2-aminobutyramide salt.
- a high-purity 2-aminoalkylamide inorganic acid salt that does not require a distillation and concentration step with side reactions, reduces loss to the filtrate during crystal separation, and further reduces the amount of inorganic salt contamination. has been found to be obtained in a high yield, and the present invention has been completed.
- the present invention relates to a method for producing a 2-aminobutyramide inorganic acid salt (5) from 2-hydroxybutyronitrile (1) described in the following 1) to 17).
- the production method includes the following steps (A), (B) and ( A process for producing 2-aminobutyramide inorganic acid salt (5), which comprises C).
- the reaction is carried out under conditions where the water content is 3 times mol or less, and the amount of 2-aminobutyramide Schiff base (3) is 0.6 times mol or more with respect to 2-aminobutyronitrile (2) contained in the reaction solution.
- R is a methyl group or an ethyl group.
- X is an inorganic acid anion.
- step (A) ammonia is used in an amount of 1.0 to 1.5 times mol of 2-hydroxybutyronitrile (1).
- step (A) The process for producing a 2-aminobutyramide inorganic acid salt (5) according to 1), wherein ammonia water is used as ammonia in step (A).
- step (A) the concentration of aqueous ammonia is 35% by mass or more, and ammonia is used in an amount of 1.5 to 2.5 mol per mol of 2-hydroxybutyronitrile (1).
- step (B) the reaction solution containing 2-aminobutyronitrile (2) was separated into two layers by adding an inorganic strong base or an inorganic strong base aqueous solution, and was contained in the upper organic phase.
- the reaction solution containing 2-aminobutyronitrile (2) in the upper layer is separated from the aqueous inorganic strong base solution in the lower layer, and the separated reaction solution is used for the reaction.
- step (B) the reaction solution containing 2-aminobutyronitrile (2) is degassed under a reduced pressure of 30 to 760 mmHg to distill off ammonia, and used in the reaction.
- step (B) the inorganic strong base is used in an amount of 0.005 to 0.1-fold mol with respect to 2-aminobutyronitrile (2). 5) Production method.
- step (B) The 2-aminobutyramide inorganic acid salt according to 1), wherein the ketone solvent is used in a molar amount of 1.0 to 12.0 times that of 2-aminobutyronitrile (2) in step (B). 5) Production method. 12) The process for producing a 2-aminobutyramide inorganic acid salt (5) according to 1), wherein in the step (B), the ketone solvent is acetone. 13) In step (C), the reaction solution obtained in step (B) is brought into contact with an inorganic acid or an aqueous solution of inorganic acid at an acid excess ratio such that the solution pH after contact mixing is 1 to 6. 2) A production method of 2-aminobutyramide inorganic acid salt (5).
- step (C) The method for producing 2-aminobutyramide inorganic acid salt (5) according to 1), wherein in step (C), hydrogen chloride gas or an aqueous hydrochloric acid solution of 20% by mass or more is used as the inorganic acid or the inorganic acid aqueous solution. . 15) Further, the liquid containing the 2-aminobutyramide inorganic acid salt (5) obtained in the step (C) is crystallized directly or after being poured into a ketone solvent, and the precipitated crystals are separated into solid and liquid. A process for producing the 2-aminobutyramide inorganic acid salt (5) according to 1).
- 2-aminobutyramide inorganic acid salt (5) is obtained from 2-hydroxybutyronitrile (1), 2-hydroxybutyronitrile (1) is reacted with ammonia to give 2-aminobutyronitrile (2 )
- 2-aminobutyronitrile (2) is reacted with ammonia to give 2-aminobutyronitrile (2 )
- the main component 2-aminobutyramide Schiff base (3) and the subsidiary component 2-aminobutyramide (4) 2-aminobutyramide having a low water content and a small amount of inorganic salts such as ammonia inorganic acid salt is obtained by contacting a reaction liquid containing a reaction product comprising an inorganic acid or an aqueous inorganic acid solution under acidic conditions.
- a crystal slurry liquid containing the inorganic acid salt (5) can be obtained.
- the mother liquor loss during the solid-liquid separation of the crystals is reduced, and the 2-aminobutyramide inorganic acid salt (5) with high yield and high purity can be produced.
- the present invention comprises a step (A) for synthesizing 2-aminobutyronitrile (2) from 2-hydroxybutyronitrile (1), and a 2-aminobutyramide Schiff base (3) from 2-aminobutyronitrile (2).
- 2-aminobutyramide (4) synthesis step (B) 2-aminobutyramide inorganic acid salt (5) is synthesized from 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4)
- 2-Hydroxybutyronitrile (1) used in the step (A) of the present invention may be synthesized by a usual cyanohydrination reaction, for example, synthesized from propionaldehyde and hydrogen cyanide.
- ammonia to be reacted with 2-hydroxybutyronitrile (1) any of ammonia gas, liquid ammonia, and aqueous ammonia solution can be used. However, it is possible to avoid mixing water into the reaction system and a complicated reaction apparatus. Ammonia gas is desirable in that it does not need to be used. In addition, although ammonia gas can be used as it is, it may be used after it is made dry ammonia gas by passing through a dehydration column using calcium chloride or the like.
- the amount of ammonia used in the reaction must be equimolar or more stoichiometrically with respect to 2-hydroxybutyronitrile (1), but when ammonia gas and liquid ammonia are used, contamination of inorganic salts in the product Therefore, the amount is preferably as close to the theoretical amount as possible, and in that sense, the molar ratio is preferably 1.0 to 1.5 times the molar amount relative to 2-hydroxybutyronitrile (1). It is more preferably 1.0 to 1.2 times mole.
- ammonia water When ammonia water is used, the reactivity is lower than when ammonia gas and liquid ammonia are used, and the amount of water in the subsequent process is reduced, so that ammonia water has a concentration of 35% by mass or more.
- the amount of ammonia relative to 2-hydroxybutyronitrile (1) is preferably 1.5 times to 2.5 times mol, more preferably 1.8 times to 2.3 times mol. .
- the reaction temperature is preferably in the range of ⁇ 5 to 25 ° C. so that 2-aminobutyronitrile (2) as a reaction product does not form a by-product such as a dimer, and is preferably 0 to 20 ° C. It is more preferable to carry out in the range.
- the reaction solution obtained in the step (A) is used directly or after dehydration or deammonia treatment.
- the step (B) Of course, it can be used as a reaction raw material.
- the reaction solution is separated into two layers by adding an inorganic strong base or an inorganic strong base aqueous solution to the reaction solution.
- the reaction solution containing the nitrile (2) and the inorganic strong base aqueous solution containing the removed water are separated.
- an alkali metal such as sodium hydroxide, potassium hydroxide or calcium hydroxide, which is convenient for treatment after use, or Alkaline earth metal hydroxides are preferred, and sodium hydroxide is particularly preferred.
- the amount of the inorganic strong base used is preferably such that the concentration of the inorganic base in the lower layer to be obtained is 15% by mass or more, and 30% by mass. It is more preferable to add so that it may become more than%.
- the obtained lower layer can also be used in a step of obtaining a reaction solution containing 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4) as an inorganic strong base.
- the deammonia treatment after the synthesis of 2-aminobutyronitrile (2) is not particularly limited, but from the viewpoint of treatment time and operability, a reduced pressure of 30 to 760 mmHg is preferable, and a reduced pressure of 50 to 600 mmHg. Is more preferable.
- the ammonia content in the reaction with the ketone solvent in the presence of the strong inorganic base is 2- It is preferable that it is 0.3 times mole or less with respect to aminobutyronitrile (2).
- the purity of the 2-aminobutyramide inorganic acid salt (5) obtained in the step (C) is undesirably lowered.
- the ammonia removal condition is 600 mmHg and 30 minutes, the ammonia content is reduced from 0.36 to 0.23 with respect to 2-aminobutyronitrile (2), and a product with a purity of 95% can be obtained (Table 1). 1).
- the synthesis of 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4) in the step (B) of the present invention is carried out in the presence of water, a strong inorganic base, and a ketone solvent.
- the nitrile (2) is reacted by dropping.
- an inorganic strong base is added dropwise to the ketone solvent, and then 2-aminobutyronitrile (2) is added. It is preferable to drop.
- the inorganic strong base used in this reaction promotes activation of the amino group and reacts with a ketone solvent to form 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4) via oxazolidine.
- Working as a catalyst There are no restrictions on the type of inorganic strong base used, but hydroxides of alkali metals or alkaline earth metals such as sodium hydroxide, potassium hydroxide and calcium hydroxide, which are readily available as industrial raw materials and are convenient for post-use treatment. In particular, sodium hydroxide is preferred.
- the amount of the strong base to be used is preferably as small as possible, and in that sense, it is 0.005 to 0.1 times the molar ratio with respect to 2-aminobutyronitrile (2).
- the amount is 0.02 to 0.07 times mol.
- the amount is less than 0.005 mol, a decrease in the reaction rate to become a Schiff base is observed.
- the amount exceeds 0.1 mol, the catalyst activity is not increased, and the inorganic content required for neutralization of the strong base used is simply not increased. This is not preferable because the acid amount increases and the amount of inorganic salt mixed in the product increases.
- ketone solvent used in the step (B) of the present invention is not particularly limited.
- ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and the like are preferable, and among these, methyl ethyl ketone, acetone Are preferred, and acetone is particularly preferred.
- the amount of the ketone solvent used is stoichiometrically more than 1 equivalent to form the Schiff salt, but serves as a reaction solvent that maintains the solubility and dispersibility of the reaction raw materials and products,
- it is preferably 1 to 12 times by mole, more preferably 3 to 6 times by mole, relative to the starting 2-aminobutyronitrile (2). preferable.
- the weight ratio is preferably 4 times or more, and more preferably 7 times or more.
- the reaction temperature is -20 to 30 ° C. in order to suppress hydrolysis reaction of 2-aminobutyramide Schiff base (3) to 2-aminobutyramide (4) and side reaction to 4-imidazolidinone.
- a temperature range is preferable, and a temperature range of 0 to 20 ° C. is more preferable. If the temperature is higher than 30 ° C., side reactions become apparent, and if the temperature is lower than 0 ° C., the reaction time becomes longer and disadvantageous in terms of energy costs associated with cooling. Note that the extension of the reaction time leads to by-production of ⁇ -imidazolidinone after the 2-aminobutyramide Schiff base (3) is hydrolyzed to 2-aminobutyramide (4). It is desirable that the time be about 3 to 10 hours.
- the amount of aminobutyramide (4) produced increases. For example, when the water content is 0.24 mol relative to 2-aminobutyronitrile (2), the production molar ratio of 2-aminobutyramide Schiff base (3) is 2-aminobutyronitrile (2). 0.85-fold mol of 2-aminobutyramide (4) is formed 0.08-fold mol of 2-aminobutyronitrile (2).
- the loss of the target 2-aminobutyramide inorganic acid salt (5) to the filtrate increases.
- the loss to the filtrate can also be reduced by increasing the amount of the ketone solvent used as the reaction solvent, but it is not preferable in view of production efficiency because the accompanying solvent recovery cost increases.
- the water contained in the reaction solution of step (B) includes 2-aminobutyronitrile (2), including water by-produced during the synthesis of 2-aminobutyronitrile (2) and water derived from an aqueous inorganic strong base solution.
- the Schiff base production rate is with respect to 2-aminobutyronitrile (2) obtained in step (A). It is preferable because it becomes 0.6 times mol or more.
- inorganic acid used in the formation of the inorganic acid salt in step (C) there are no particular restrictions on the type of inorganic acid used in the formation of the inorganic acid salt in step (C), and examples include hydrochloric acid, hydrogen chloride gas, and nitric acid. From the viewpoint of the advantages, hydrochloric acid and hydrogen chloride gas are preferable, and hydrochloric acid is more preferable.
- the inorganic acid used may be either a gaseous or liquid inorganic acid or an aqueous inorganic acid solution, but an inorganic acid aqueous solution having a concentration of 20% by mass or more or a gaseous or liquid inorganic acid is preferred.
- the amount of inorganic acid used is such that 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4) contained in the reaction solution obtained in step (B) are 2-aminobutyramide inorganic acid.
- the amount is not particularly limited as long as it is converted into the salt (5), but usually 1.0 to 1.2 with respect to 2-aminobutyronitrile (2) charged as a raw material in the step (B). It is preferable to add so that the pH of the reaction mixture after contacting with an inorganic acid is 1 to 6, particularly preferably 3 to 5, using a double mole.
- the pH of the reaction mixture is preferably maintained at pH 1-6 until the solid of the 2-aminobutyramide inorganic acid salt (5) is solid-liquid separated at the time of contact with the inorganic acid. 5 is preferably maintained.
- the pH is maintained above 6, it is observed that a portion of the inorganic acid salt does not progress, stops with unstable 2-aminobutyramide, and the yield of 2-aminobutyramide inorganic acid salt decreases.
- the pH is maintained at a pH of less than 1, the resulting 2-aminobutyramide inorganic acid salt has a yellowish coloring phenomenon.
- the solvent composition is preferably as low as possible in order to reduce the solubility and improve the crystal yield.
- a ketone solvent can be added after the synthesis, the water content in the mother liquor is preferably 15% or less from the viewpoint of industrial productivity.
- the solid-liquid separation temperature of the crystals is preferably from ⁇ 10 to 20 ° C. and from 0 to 10 ° C. from the viewpoint of reducing the solubility of the 2-aminobutyramide inorganic acid salt (5) and reducing the mother liquor loss. More preferred.
- the mother liquor containing the inorganic salt adhering to the crude crystals obtained by solid-liquid separation is washed away, it is also possible to wash with acetone or alcohol such as methanol or ethanol.
- acetone or alcohol such as methanol or ethanol.
- it is preferably washed with the solvent cooled to ⁇ 10 to 20 ° C., more preferably 0 to 10 ° C.
- the amount of the washing solution used is 0.5 to 3 times the amount of the crude crystals separated by filtration.
- the ketone solvent such as acetone contained in the mother liquor can be easily recovered by distillation operation and can be used for the next reaction.
- step (A) the reaction between 2-hydroxybutyronitrile (1) and ammonia in the step (A) produces water in the same mole as 2-hydroxybutyronitrile (1) because this reaction is a dehydration substitution reaction. It will be.
- the total amount of 2-aminobutyramide (4) Assuming the case of being converted into (), water equivalent to 2-aminobutyronitrile (2) is consumed. Therefore, when step (A) and step (B) are combined, step (A) The water generated in step (B) is consumed in step (B), and the amount of water is calculated as 0 mol.
- the water accompanying the inorganic strong base aqueous solution used in the step (B) and the water accompanying the inorganic acid aqueous solution used in the step (C) are converted into the 2-aminobutyramide inorganic acid salt (5 ) The amount of water in the mother liquor when the crystals are separated into solid and liquid.
- the amino group is protected because the Schiff base is the main component, side reactions such as dimerization are unlikely to occur, and a high-quality product with few impurities can be obtained.
- ammonia is removed, the production amount of ammonium inorganic acid salt is reduced, and the mixing amount into the product is also reduced.
- the amount of inorganic strong base used as a catalyst in the step (B) is also reduced, the amount of inorganic strong base salt mixed in is also reduced.
- Example 1 Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, 24.0 g (0.27 mol) of 2-hydroxybutyronitrile was added, and ammonia was stirred while maintaining the liquid temperature at 8 ⁇ 2 ° C. After gas 6.0 g (0.35 mol [1.3 eq / 2-hydroxybutyronitrile]) was blown in, this was reacted at a reaction temperature of 20 ° C. for 8 hours to obtain a 2-aminobutyronitrile aqueous solution. 30.0 g (0.24 mol, [2-aminobutyronitrile purity 67.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
- a reaction substrate solution 95.4 g having a charging ratio of [1.2 equivalent / 2-aminobutyronitrile], 2-aminobutyronitrile 21.1%, acetone 68.1% was prepared. This was reacted at a reaction temperature of 20 ° C. for 7 hours to give 25.8 g of 2-aminobutylamide Schiff base (0.18 mol [0.76 times mol / 2-aminobutyronitrile]) and 2-aminobutyramide 3 95.4 g of a reaction solution containing 9.9 g (0.04 mol [0.16 mol / 2-aminobutyronitrile]) was obtained.
- the 2-aminobutylamide Schiff base was identified by 1 H-NMR and 13 C-NMR.
- Example 2 Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser was placed 83.1 g (0.93 mol) of 2-hydroxybutyronitrile, and ammonia was stirred while maintaining the liquid temperature at 8 ⁇ 2 ° C. After 20.7 g (1.22 mol [1.3 eq / 2-hydroxybutyronitrile]) of gas was blown in, this was reacted at a reaction temperature of 20 ° C. for 8 hours to obtain a 2-aminobutyronitrile aqueous solution. 103.8 g (0.84 mol [2-aminobutyronitrile purity 68.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
- Example 3 Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser was placed 83.1 g (0.93 mol) of 2-hydroxybutyronitrile, and ammonia was stirred while maintaining the liquid temperature at 8 ⁇ 2 ° C. After 20.7 g (1.22 mol [1.3 eq / 2-hydroxybutyronitrile]) of gas was blown in, this was reacted at a reaction temperature of 20 ° C. for 8 hours to obtain a 2-aminobutyronitrile aqueous solution. 103.8 g (0.84 mol [2-aminobutyronitrile purity 68.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
- Example 4 2-hydroxybutyronitrile (15.9 g, 0.18 mol) was placed in a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, and ammonia gas was maintained while maintaining the liquid temperature at about 10 ° C. with stirring. After blowing 3.9 g (0.23 mol [1.3 eq / 2-hydroxybutyronitrile]), this was reacted at a reaction temperature of 20 ° C. for 8 hours. As a result, an aqueous 2-aminobutyronitrile solution 19 0.8 g (0.17 mol [2-aminobutyronitrile purity 70.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
- reaction substrate solution comprising 2%, water 1.3% [0.24 equivalent / 2-aminobutyronitrile], 2-aminobutyronitrile 21.6%, acetone 72.3% Prepared. This was reacted at a reaction temperature of 20 ° C. for 7 hours, and 19.3 g of 2-aminobutylamide Schiff base (0.14 mol [0.85 times mol / 2-aminobutyronitrile]) and 2-aminobutyramide 1 60.4 g of a reaction solution containing 3 g (0.01 mol [0.08-fold mol / 2-aminobutyronitrile]) was obtained.
- Example 5 Pure water 33.2 g (1.84 mol) was placed in a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, and ammonia gas 23.0 g (24.0 g) was maintained while maintaining the liquid temperature at about 10 ° C. with stirring. 1.35 mol [2.0 eq / 2-hydroxybutyronitrile]) was blown in, and 58.1 g (0.68 mol) of 2-hydroxybutyronitrile was stirred and the liquid temperature was kept at about 10 ° C. The solution was added dropwise over 5 hours. When this was reacted at a reaction temperature of 20 ° C.
- Comparative Example 1 Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, 117.4 g (1.30 mol) of 2-hydroxybutyronitrile was placed, and ammonia was maintained while maintaining the liquid temperature at 8 ⁇ 2 ° C. with stirring. 27.4 g of gas (1.61 mol [1.2 eq / 2-hydroxybutyronitrile]) was added and reacted at a reaction temperature of 20 ° C. for 8 hours.
Abstract
Description
2-アミノブチルアミド無機酸塩(5)のケトン系溶媒に対する溶解度は、母液中の水分量が少ないほど低い。よって、母液中の含水率を減らすことによって、結晶分離工程における2-アミノブチルアミド無機酸塩(5)の濾液への損失が低減可能となった。 Thus, when synthesizing 2-aminobutyramide Schiff base (3) and 2-aminobutyramide (4) from 2-aminobutyronitrile (2) in step (B), the amount of water in the reaction solution By adopting an operation method that restricts the amount of water to a low level, a product containing 2-aminobutyramide Schiff base (3) as a main component is obtained, and further by using this product, in step (C), a small amount of water It has been found that it can be converted to the 2-aminobutyramide inorganic acid salt (5) at a high rate and in a high yield with an increase in the amount and, in some cases, a decrease in water accompanying the hydrolysis reaction of the Schiff base.
The solubility of the 2-aminobutyramide inorganic acid salt (5) in the ketone solvent is lower as the amount of water in the mother liquor is smaller. Therefore, by reducing the water content in the mother liquor, the loss of 2-aminobutyramide inorganic acid salt (5) to the filtrate in the crystal separation step can be reduced.
1)2-ヒドロキシブチロニトリル(1)から、2-アミノブチルアミド無機酸塩(5)を製造する方法において、該製造方法が以下に示す工程(A)、工程(B)、および工程(C)を含むことを特徴とする、2-アミノブチルアミド無機酸塩(5)の製造方法。
工程(A):2-ヒドロキシブチロニトリル(1)をアンモニアと反応させて、2-アミノブチロニトリル(2)を含む反応液を得る工程。
工程(B):工程(A)で得た反応液を、無機強塩基と、アセトンおよびメチルエチルケトンから選ばれる1種類以上のケトン系溶媒の存在下、2-アミノブチロニトリル(2)に対して水分量が3倍モル以下の条件で反応させ、反応液中に含まれていた2-アミノブチロニトリル(2)に対し、0.6倍モル以上の2-アミノブチルアミドシッフ塩基(3)と0.4倍モル以下の2-アミノブチルアミド(4)を含む反応液を得る工程。
工程(C):工程(B)で得た反応液に、無機酸または無機酸水溶液を加えて、2-アミノブチルアミド無機酸塩(5)を得る工程。
2)工程(A)において、アンモニアとしてアンモニアガスを使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
3)工程(A)において、アンモニアを2-ヒドロキシブチロニトリル(1)に対して1.0~1.5倍モル使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
4)工程(A)において、アンモニアとしてアンモニア水を使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
5)工程(A)において、アンモニア水の濃度が35質量%以上であり、アンモニアを2-ヒドロキシブチロニトリル(1)に対して1.5~2.5倍モル使用する、4)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
6)工程(B)において、2-アミノブチロニトリル(2)を含む反応液に無機強塩基または無機強塩基水溶液を加えることによって二層に分離させ、上層の有機相中に含まれていた水を下層の水相へ移行させた後に、上層の2-アミノブチロニトリル(2)を含む反応液を下層の無機強塩基水溶液より分取し、分取した反応液を反応に使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
7)2-アミノブチロニトリル(2)を含む反応液に対して、下層の無機強塩基水溶液中の無機強塩基濃度が15質量%を下回らないように無機強塩基または無機強塩基水溶液を加える、6)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
8)工程(B)において、2-アミノブチロニトリル(2)を含む反応液を30~760mmHgの減圧下で脱気してアンモニアを留去したものを反応に使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
9)工程(B)において、無機強塩基を、2-アミノブチロニトリル(2)に対し0.005~0.1倍モル使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
10)工程(B)において、無機強強塩基として、水酸化ナトリウム、水酸化カリウムおよび水酸化カルシウムから選ばれる一種以上の無機強塩基を使用する、1)記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
11)工程(B)において、ケトン系溶媒を、2-アミノブチロニトリル(2)に対し1.0~12.0倍モル使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
12)工程(B)において、ケトン系溶媒がアセトンである、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
13)工程(C)において、工程(B)で得た反応液を、無機酸または無機酸水溶液と、接触混合後の液pHが1~6になるような酸過剰な比率で接触させる、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
14)工程(C)において、無機酸または無機酸水溶液として、塩化水素ガスまたは20質量%以上の塩酸水溶液を使用する、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
15)さらに、工程(C)で得られた2-アミノブチルアミド無機酸塩(5)を含む液をそのまま直接またはケトン系溶媒中に注加した後に晶析し、析出した結晶を固液分離する工程を含む、1)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
16)母液の含水率が15質量%以下となる条件範囲下で、2-アミノブチルアミド無機酸塩(5)結晶の晶析と固液分離を行う、15)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。
17)ケトン系溶媒がアセトンである、15)に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 That is, the present invention relates to a method for producing a 2-aminobutyramide inorganic acid salt (5) from 2-hydroxybutyronitrile (1) described in the following 1) to 17).
1) In the method for producing 2-aminobutyramide inorganic acid salt (5) from 2-hydroxybutyronitrile (1), the production method includes the following steps (A), (B) and ( A process for producing 2-aminobutyramide inorganic acid salt (5), which comprises C).
Step (A): A step of reacting 2-hydroxybutyronitrile (1) with ammonia to obtain a reaction solution containing 2-aminobutyronitrile (2).
Step (B): The reaction solution obtained in Step (A) is added to 2-aminobutyronitrile (2) in the presence of a strong inorganic base and one or more ketone solvents selected from acetone and methyl ethyl ketone. The reaction is carried out under conditions where the water content is 3 times mol or less, and the amount of 2-aminobutyramide Schiff base (3) is 0.6 times mol or more with respect to 2-aminobutyronitrile (2) contained in the reaction solution. And a step of obtaining a reaction solution containing 0.4-fold mol or less of 2-aminobutyramide (4).
Step (C): A step of adding the inorganic acid or the aqueous inorganic acid solution to the reaction solution obtained in the step (B) to obtain the 2-aminobutyramide inorganic acid salt (5).
2) The process for producing 2-aminobutyramide inorganic acid salt (5) according to 1), wherein ammonia gas is used as ammonia in step (A).
3) In step (A), ammonia is used in an amount of 1.0 to 1.5 times mol of 2-hydroxybutyronitrile (1). 2-aminobutyramide inorganic acid salt (5) according to 1) Manufacturing method.
4) The process for producing a 2-aminobutyramide inorganic acid salt (5) according to 1), wherein ammonia water is used as ammonia in step (A).
5) In step (A), the concentration of aqueous ammonia is 35% by mass or more, and ammonia is used in an amount of 1.5 to 2.5 mol per mol of 2-hydroxybutyronitrile (1). Of 2-aminobutyramide inorganic acid salt (5).
6) In step (B), the reaction solution containing 2-aminobutyronitrile (2) was separated into two layers by adding an inorganic strong base or an inorganic strong base aqueous solution, and was contained in the upper organic phase. After transferring water to the lower aqueous phase, the reaction solution containing 2-aminobutyronitrile (2) in the upper layer is separated from the aqueous inorganic strong base solution in the lower layer, and the separated reaction solution is used for the reaction. A process for producing the 2-aminobutyramide inorganic acid salt (5) according to 1).
7) To the reaction solution containing 2-aminobutyronitrile (2), add an inorganic strong base or an inorganic strong base aqueous solution so that the concentration of the inorganic strong base in the lower inorganic strong base aqueous solution does not fall below 15% by mass. 6) The process for producing 2-aminobutyramide inorganic acid salt (5).
8) In step (B), the reaction solution containing 2-aminobutyronitrile (2) is degassed under a reduced pressure of 30 to 760 mmHg to distill off ammonia, and used in the reaction. A process for producing 2-aminobutyramide inorganic acid salt (5).
9) In step (B), the inorganic strong base is used in an amount of 0.005 to 0.1-fold mol with respect to 2-aminobutyronitrile (2). 5) Production method.
10) The 2-aminobutyramide inorganic acid salt according to 1), wherein at least one inorganic strong base selected from sodium hydroxide, potassium hydroxide and calcium hydroxide is used as the strong inorganic base in step (B) The manufacturing method of (5).
11) The 2-aminobutyramide inorganic acid salt according to 1), wherein the ketone solvent is used in a molar amount of 1.0 to 12.0 times that of 2-aminobutyronitrile (2) in step (B). 5) Production method.
12) The process for producing a 2-aminobutyramide inorganic acid salt (5) according to 1), wherein in the step (B), the ketone solvent is acetone.
13) In step (C), the reaction solution obtained in step (B) is brought into contact with an inorganic acid or an aqueous solution of inorganic acid at an acid excess ratio such that the solution pH after contact mixing is 1 to 6. 2) A production method of 2-aminobutyramide inorganic acid salt (5).
14) The method for producing 2-aminobutyramide inorganic acid salt (5) according to 1), wherein in step (C), hydrogen chloride gas or an aqueous hydrochloric acid solution of 20% by mass or more is used as the inorganic acid or the inorganic acid aqueous solution. .
15) Further, the liquid containing the 2-aminobutyramide inorganic acid salt (5) obtained in the step (C) is crystallized directly or after being poured into a ketone solvent, and the precipitated crystals are separated into solid and liquid. A process for producing the 2-aminobutyramide inorganic acid salt (5) according to 1).
16) 2-aminobutyramide inorganic acid salt (5) Crystallization and solid-liquid separation of the 2-aminobutyramide inorganic acid salt (5) are performed under a condition range in which the water content of the mother liquor is 15% by mass or less. Manufacturing method of inorganic acid salt (5).
17) The process for producing a 2-aminobutyramide inorganic acid salt (5) according to 15), wherein the ketone solvent is acetone.
これによって結晶を固液分離する際の母液ロスが低減され、高収率で高純度の2-アミノブチルアミド無機酸塩(5)を製造することが可能となる。 In the process for producing 2-aminobutyramide inorganic acid salt (5) from 2-hydroxybutyronitrile (1), 2-hydroxybutyronitrile (1) is reacted with ammonia to give 2-aminobutyronitrile (2 ) In the presence of a strong inorganic base and a ketone solvent, the main component 2-aminobutyramide Schiff base (3) and the subsidiary component 2-aminobutyramide (4) 2-aminobutyramide having a low water content and a small amount of inorganic salts such as ammonia inorganic acid salt is obtained by contacting a reaction liquid containing a reaction product comprising an inorganic acid or an aqueous inorganic acid solution under acidic conditions. A crystal slurry liquid containing the inorganic acid salt (5) can be obtained.
As a result, the mother liquor loss during the solid-liquid separation of the crystals is reduced, and the 2-aminobutyramide inorganic acid salt (5) with high yield and high purity can be produced.
結晶の固液分離温度は2-アミノブチルアミド無機酸塩(5)の溶解度を下げ、母液ロスを低減させる意味から、-10から20℃で行うことが好ましく、0から10℃で行うことがより好ましい。また、固液分離によって得られた粗結晶に付着した無機塩を含む母液を洗い流すため、アセトン或いはメタノール、エタノール等のアルコールで洗浄することも可能である。その時の結晶の溶解損失を減らすため好ましくは-10から20℃、より好ましくは0~10℃に冷却した前記溶媒で洗浄する。使用される洗浄液量は濾別された粗結晶量の0.5~3倍容を目安とする。なお、母液中に含まれるアセトン等のケトン系溶媒は蒸留操作で容易に回収でき、次反応への利用も可能である。 In the synthesis of 2-aminobutyramide inorganic acid salt (5), after contacting the inorganic acid with 2-aminobutyramide Schiff base (3), minute crystals of 2-aminobutyramide inorganic acid salt (5) are instantaneously formed. In order to increase the crystal grain size and improve the separability at the time of solid-liquid separation, it is preferable to age at 20 to 50 ° C., more preferably 30 to 40 ° C. When the temperature is lower than 20 ° C., crystal formation proceeds rapidly, so that a crystal having a large particle size and excellent filterability cannot be obtained. When the temperature is higher than 50 ° C., crystal formation is hindered from the viewpoint of solubility. Although the aging time varies depending on the aging temperature, for example, when aging is performed at 40 ° C., 2 to 10 hours are preferable. The solvent composition is preferably as low as possible in order to reduce the solubility and improve the crystal yield. Although a ketone solvent can be added after the synthesis, the water content in the mother liquor is preferably 15% or less from the viewpoint of industrial productivity.
The solid-liquid separation temperature of the crystals is preferably from −10 to 20 ° C. and from 0 to 10 ° C. from the viewpoint of reducing the solubility of the 2-aminobutyramide inorganic acid salt (5) and reducing the mother liquor loss. More preferred. Moreover, since the mother liquor containing the inorganic salt adhering to the crude crystals obtained by solid-liquid separation is washed away, it is also possible to wash with acetone or alcohol such as methanol or ethanol. In order to reduce the dissolution loss of the crystal at that time, it is preferably washed with the solvent cooled to −10 to 20 ° C., more preferably 0 to 10 ° C. The amount of the washing solution used is 0.5 to 3 times the amount of the crude crystals separated by filtration. The ketone solvent such as acetone contained in the mother liquor can be easily recovered by distillation operation and can be used for the next reaction.
なお、2-ヒドロキシブチロニトリル、2-アミノブチロニトリル及び2-アミノブチルアミド塩酸塩は高速液体クロマトグラフィーを用いて下記HPLC分析条件にて測定し、アンモニア分、水分、2-アミノブチルアミドシッフ塩基及び2-アミノブチルアミドはガスクロマトグラフィーを用いて下記GC分析条件にて測定した。また、同定などに用いた核磁気共鳴スペクトル(1H-NMR、13C-NMR)は、下記の条件にて測定した。
[HPLC分析条件]
カラム:CAPCELL PAK CR 1:4 φ4.6mm×250mm (資生堂)
移動層:水/メタノール=49/1(2.3mM過塩素酸及び5mMペンタンスルホン酸ナトリウム含有)
流速:1ml/分
検出:RI
[GC分析条件]
カラム:TENAX TA60/80 φ2.6mm×2M (ジーエルサイエンス)
温度:80℃(0分)→10℃/分→230℃(30分)
キャリアガス:ヘリウム
流速:10ml/分
検出:TCD
[核磁気共鳴スペクトル測定条件(1H-NMR、13C-NMR)]
測定周波数:500MHz(1H-NMR)、125MHz(13C-NMR)
溶媒:重クロロホルム
化学シフト基準物質:テトラメチルシラン Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.
In addition, 2-hydroxybutyronitrile, 2-aminobutyronitrile and 2-aminobutyramide hydrochloride were measured under the following HPLC analysis conditions using high performance liquid chromatography, and the ammonia content, moisture, 2-aminobutyramide were measured. The Schiff base and 2-aminobutyramide were measured using gas chromatography under the following GC analysis conditions. Further, nuclear magnetic resonance spectra ( 1 H-NMR, 13 C-NMR) used for identification and the like were measured under the following conditions.
[HPLC analysis conditions]
Column: CAPCELL PAK CR 1: 4 φ4.6 mm × 250 mm (Shiseido)
Moving layer: water / methanol = 49/1 (containing 2.3 mM perchloric acid and 5 mM sodium pentanesulfonate)
Flow rate: 1 ml / min Detection: RI
[GC analysis conditions]
Column: TENAX TA60 / 80 φ2.6mm × 2M (GL Science)
Temperature: 80 ° C (0 minutes) → 10 ° C / minute → 230 ° C (30 minutes)
Carrier gas: Helium Flow rate: 10 ml / min Detection: TCD
[Nuclear magnetic resonance spectrum measurement conditions ( 1 H-NMR, 13 C-NMR)]
Measurement frequency: 500 MHz ( 1 H-NMR), 125 MHz ( 13 C-NMR)
Solvent: Deuterated chloroform chemical shift Reference material: Tetramethylsilane
攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコに2-ヒドロキシブチロニトリル24.0g(0.27モル)を入れ、攪拌下、液温を8±2℃に保ちながらアンモニアガス6.0g(0.35モル[1.3当量/2-ヒドロキシブチロニトリル])を吹き込んだ後、これを反応温度20℃にて8時間反応させたところ、2-アミノブチロニトリル水溶液30.0g(0.24モル、[2-アミノブチロニトリル純度67.0%、水分17.0%、アンモニア分5.0%])を得た。
続いて、攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコにアセトン65.0g(1.12モル)、48%水酸化ナトリウム水溶液0.40g(0.005モル[0.02当量/2-アミノブチロニトリル])を入れ、攪拌下、2-アミノブチロニトリル水溶液30.0g(0.24モル)を滴下して、水酸化ナトリウム0.2%、水5.5%[1.2当量/2-アミノブチロニトリル]、2-アミノブチロニトリル21.1%、アセトン68.1%の仕込み比率よりなる反応基質液95.4gを調製した。これを反応温度20℃にて7時間反応させ、2-アミノブチルアミドシッフ塩基25.8g(0.18モル[0.76倍モル/2-アミノブチロニトリル])および2-アミノブチルアミド3.9g(0.04モル[0.16倍モル/2-アミノブチロニトリル])を含む反応液95.4gを得た。なお、2-アミノブチルアミドシッフ塩基は、1H-NMRおよび13C-NMRにより同定した。
1H-NMR δ[ppm]:0.89(CH 3 -CH2-CH<); 1.75,1.86(CH3-CH 2 -CH<); 1.86,2.07((CH 3 )2C=N-); 3.89(CH3-CH2-CH<); 5.69,6.91(-NH 2 )
13C-NMR δ[ppm]:10.2(CH3-CH2-CH<); 18.9(CH3-CH2-CH<); 27.8、29.6((CH3)2C=N-); 65.2,65.4(CH3-CH2-CH<);168.3((CH3)2 C=N-);176.5(>C=O)
次いで、この反応液と36%塩酸水溶液30.7g(0.30モル)を液温40℃液pH4になるように保持しながら少量ずつ接触させて、2-アミノブチルアミド塩酸塩29.5g(0.21モル)を得た(収率80.1%/2-ヒドロキシブチロニトリル基準)。
滴下後、0℃まで冷却してさらに晶析を図った後、濾過によって2-アミノブチルアミド塩酸塩の白色結晶28.1g(0.19モル、純度91.5%、塩化アンモニウム8.5%、塩化ナトリウム0.02%)の結晶を取得した。出発原料の2-ヒドロキシブチロニトリルに対する取得収率69.9%、母液ロス10.2%であり、不純物のイミダゾリジノンは検出されなかった。また母液の含水率は15.0%だった。 Example 1
Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, 24.0 g (0.27 mol) of 2-hydroxybutyronitrile was added, and ammonia was stirred while maintaining the liquid temperature at 8 ± 2 ° C. After gas 6.0 g (0.35 mol [1.3 eq / 2-hydroxybutyronitrile]) was blown in, this was reacted at a reaction temperature of 20 ° C. for 8 hours to obtain a 2-aminobutyronitrile aqueous solution. 30.0 g (0.24 mol, [2-aminobutyronitrile purity 67.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
Subsequently, 65.0 g (1.12 mol) of acetone and 0.40 g (0.005 mol [0.02 mol] of 48% sodium hydroxide aqueous solution were added to a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser. Equivalent / 2-aminobutyronitrile]), and 30.0 g (0.24 mol) of 2-aminobutyronitrile aqueous solution was added dropwise with stirring to give 0.2% sodium hydroxide and 5.5% water. A reaction substrate solution 95.4 g having a charging ratio of [1.2 equivalent / 2-aminobutyronitrile], 2-aminobutyronitrile 21.1%, acetone 68.1% was prepared. This was reacted at a reaction temperature of 20 ° C. for 7 hours to give 25.8 g of 2-aminobutylamide Schiff base (0.18 mol [0.76 times mol / 2-aminobutyronitrile]) and 2-aminobutyramide 3 95.4 g of a reaction solution containing 9.9 g (0.04 mol [0.16 mol / 2-aminobutyronitrile]) was obtained. The 2-aminobutylamide Schiff base was identified by 1 H-NMR and 13 C-NMR.
1 H-NMR δ [ppm] : 0.89 (C H 3 -CH 2 -CH <); 1.75,1.86 (CH 3 -C H 2 -CH <); 1.86,2.07 ((C H 3 ) 2 C═N—); 3.89 (CH 3 —CH 2 —C H <); 5.69, 6.91 (—N H 2 )
13 C-NMR δ [ppm] : 10.2 (C H 3 -CH 2 -CH <); 18.9 (CH 3 - C H 2 -CH <); 27.8,29.6 ((C H 3) 2 C = N-); 65.2,65.4 (CH 3 -CH 2 - C H <); 168.3 ((CH 3) 2 C = N -); 176.5 (> C = O)
Next, the reaction solution and 30.7 g (0.30 mol) of 36% hydrochloric acid aqueous solution were contacted little by little while maintaining the solution temperature at 40 ° C. and pH 4 to give 29.5 g of 2-aminobutyramide hydrochloride ( 0.21 mol) was obtained (yield 80.1% / 2-hydroxybutyronitrile basis).
After the dropwise addition, the mixture was cooled to 0 ° C. and further crystallized, and then filtered, 28.1 g of white crystals of 2-aminobutyramide hydrochloride (0.19 mol, purity 91.5%, ammonium chloride 8.5%) , Sodium chloride 0.02%) was obtained. The obtained yield was 69.9% with respect to 2-hydroxybutyronitrile as the starting material, and the mother liquor loss was 10.2%. The impurity imidazolidinone was not detected. The water content of the mother liquor was 15.0%.
攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコに2-ヒドロキシブチロニトリル83.1g(0.93モル)を入れ、攪拌下、液温を8±2℃に保ちながらアンモニアガス20.7g(1.22モル[1.3当量/2-ヒドロキシブチロニトリル])を吹き込んだ後、これを反応温度20℃にて8時間反応させたところ、2-アミノブチロニトリル水溶液103.8g(0.84モル[2-アミノブチロニトリル純度68.0%、水分17.0%、アンモニア分5.0%])を得た。
この反応液を、内圧600mmHgの減圧下で30分攪拌し、常圧に戻したところ、2-アミノブチロニトリル水溶液100.2g(0.84モル、[2-アミノブチロニトリル純度70.0%、水分17.6%、アンモニア分1.5%]を得た。
続いて、攪拌機、温度計および凝縮器を備えた500mL容の四つ口フラスコにアセトン228.0g(3.93モル)、48%水酸化ナトリウム水溶液1.6g(0.02モル[0.02当量/2-アミノブチロニトリル])を入れ、攪拌下、取得した2-アミノブチロニトリルを100.2g(0.84モル)を滴下して、水酸化ナトリウム0.2%、水5.6%[1.1当量/2-アミノブチロニトリル]、2-アミノブチロニトリル21.2%、アセトン69.1%の仕込み比率よりなる反応基質液329.8gを調製した。これを反応温度20℃にて7時間反応させ、2-アミノブチルアミドシッフ塩基92.0g(0.65モル[0.77倍モル/2-アミノブチロニトリル])および2-アミノブチルアミド11.1g(0.11モル[0.15倍モル/2-アミノブチロニトリル])を含む反応液329.8gを得た。
次いで、この反応液と36%塩酸水溶液91.2g(0.90モル)を液温40℃液pH4になるように保持しながら少量ずつ接触させて、2-アミノブチルアミド塩酸塩102.7g(0.74モル)を得た(収率80.0%/2-ヒドロキシブチロニトリル基準)。
滴下後、0℃まで冷却してさらに晶析を図った後、濾過によって2-アミノブチルアミド塩酸塩の白色結晶97.3g(0.67モル、純度95.0%、塩化アンモニウム5.0%、塩化ナトリウム0.02%)の結晶を取得した。出発原料の2-ヒドロキシブチロニトリルに対する取得収率71.7%、母液ロス9.0%であり、不純物のイミダゾリジノンは検出されなかった。また母液の含水率は14.6%だった。 Example 2
Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser was placed 83.1 g (0.93 mol) of 2-hydroxybutyronitrile, and ammonia was stirred while maintaining the liquid temperature at 8 ± 2 ° C. After 20.7 g (1.22 mol [1.3 eq / 2-hydroxybutyronitrile]) of gas was blown in, this was reacted at a reaction temperature of 20 ° C. for 8 hours to obtain a 2-aminobutyronitrile aqueous solution. 103.8 g (0.84 mol [2-aminobutyronitrile purity 68.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
This reaction solution was stirred for 30 minutes under a reduced pressure of 600 mmHg and returned to normal pressure. As a result, 100.2 g (0.84 mol, [2-aminobutyronitrile purity 70.0 mol) of an aqueous 2-aminobutyronitrile solution was obtained. %, Moisture 17.6%, ammonia content 1.5%].
Subsequently, 228.0 g (3.93 mol) of acetone and 1.6 g of 48% aqueous sodium hydroxide solution (0.02 mol [0.02 mol) were added to a 500 mL four-necked flask equipped with a stirrer, a thermometer and a condenser. Equivalent / 2-aminobutyronitrile]), and 100.2 g (0.84 mol) of the obtained 2-aminobutyronitrile was added dropwise with stirring to give 0.2% sodium hydroxide, water 5. A reaction substrate solution (329.8 g) comprising 6% [1.1 equivalent / 2-aminobutyronitrile], 2-aminobutyronitrile 21.2% and acetone 69.1% was prepared. This was reacted at a reaction temperature of 20 ° C. for 7 hours, and 92.0 g of 2-aminobutylamide Schiff base (0.65 mol [0.77-fold mol / 2-aminobutyronitrile]) and 2-aminobutyramide 11 329.8 g of a reaction solution containing 0.1 g (0.11 mol [0.15 mol / 2-aminobutyronitrile]) was obtained.
Next, the reaction solution and 91.2 g (0.90 mol) of 36% hydrochloric acid aqueous solution were brought into contact with each other while maintaining the solution temperature at 40 ° C. and pH 4 to give 102.7 g of 2-aminobutyramide hydrochloride ( 0.74 mol) was obtained (yield 80.0% / 2-hydroxybutyronitrile basis).
After the dropwise addition, the mixture was cooled to 0 ° C. and further crystallized, and then, 97.3 g (0.67 mol, purity 95.0%, ammonium chloride 5.0%) of 2-aminobutyramide hydrochloride was obtained by filtration. , Sodium chloride 0.02%) was obtained. The obtained yield based on 2-hydroxybutyronitrile as a starting material was 71.7%, and the mother liquor loss was 9.0%. The impurity imidazolidinone was not detected. The water content of the mother liquor was 14.6%.
攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコに2-ヒドロキシブチロニトリル83.1g(0.93モル)を入れ、攪拌下、液温を8±2℃に保ちながらアンモニアガス20.7g(1.22モル[1.3当量/2-ヒドロキシブチロニトリル])を吹き込んだ後、これを反応温度20℃にて8時間反応させたところ、2-アミノブチロニトリル水溶液103.8g(0.84モル[2-アミノブチロニトリル純度68.0%、水分17.0%、アンモニア分5.0%])を得た。
この反応液に48%水酸化ナトリウム水溶液40.2g(0.48モル)を滴下した後、常圧下で30分攪拌した。30分静置後、分液により上層液84.4g(0.83モル[2-アミノブチロニトリル純度83.4%、水分4.1%、アンモニア分4.0%])と下層液59.6g(水酸化ナトリウム濃度30.0%)に分取した。
続いて、攪拌機、温度計および凝縮器を備えた500mL容の四つ口フラスコにアセトン228.0g(3.93モル)、48%水酸化ナトリウム水溶液1.6g(0.02モル[0.02当量/2-アミノブチロニトリル])を入れ、攪拌下、分取した2-アミノブチロニトリルを含む上層液84.4g(0.83モル)を滴下して、水酸化ナトリウム0.2%、水1.4%[0.26当量/2-アミノブチロニトリル]、2-アミノブチロニトリル21.7%、アセトン72.7%の仕込み比率よりなる反応基質液314.0gを調製した。これを反応温度20℃にて7時間反応させ、2-アミノブチルアミドシッフ塩基100.3g(0.71モル[0.84倍モル/2-アミノブチロニトリル])および2-アミノブチルアミド7.7g(0.08モル[0.09倍モル/2-アミノブチロニトリル])を含む反応液314.0gを得た。
続いて、この反応液と36%塩酸水溶液93.3g(0.92モル)を液温40℃、液pH4になるように保持しながら少量ずつ接触させて、2-アミノブチルアミド塩酸塩101.5g(0.73モル)を得た(収率78.5%/2-ヒドロキシブチロニトリル基準)。
滴下後、0℃まで冷却してさらに晶析を図った後、濾過によって2-アミノブチルアミド塩酸塩の白色結晶98.3g(0.68モル、純度95.7%、塩化アンモニウム4.3%、塩化ナトリウム0.00%)の結晶を取得した。出発原料の2-ヒドロキシブチロニトリルに対する取得収率73.0%、母液ロス5.5%であり、不純物のイミダゾリジノンは検出されなかった。また母液の含水率は13.2%だった。 Example 3
Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser was placed 83.1 g (0.93 mol) of 2-hydroxybutyronitrile, and ammonia was stirred while maintaining the liquid temperature at 8 ± 2 ° C. After 20.7 g (1.22 mol [1.3 eq / 2-hydroxybutyronitrile]) of gas was blown in, this was reacted at a reaction temperature of 20 ° C. for 8 hours to obtain a 2-aminobutyronitrile aqueous solution. 103.8 g (0.84 mol [2-aminobutyronitrile purity 68.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
To this reaction solution, 40.2 g (0.48 mol) of a 48% sodium hydroxide aqueous solution was added dropwise, followed by stirring under normal pressure for 30 minutes. After standing for 30 minutes, 84.4 g (0.83 mol [2-aminobutyronitrile purity 83.4%, moisture 4.1%, ammonia content 4.0%]) and lower layer liquid 59 were separated by liquid separation. It was fractionated to 0.6 g (sodium hydroxide concentration 30.0%).
Subsequently, 228.0 g (3.93 mol) of acetone and 1.6 g of 48% aqueous sodium hydroxide solution (0.02 mol [0.02 mol) were added to a 500 mL four-necked flask equipped with a stirrer, a thermometer and a condenser. Equivalent amount / 2-aminobutyronitrile]), 84.4 g (0.83 mol) of the upper layer solution containing 2-aminobutyronitrile was added dropwise with stirring, and sodium hydroxide 0.2% 314.0 g of a reaction substrate solution having a charge ratio of 1.4% water [0.26 equivalent / 2-aminobutyronitrile], 21.7% 2-aminobutyronitrile, 72.7% acetone was prepared. . This was reacted at a reaction temperature of 20 ° C. for 7 hours, and 100.3 g (0.71 mol [0.84 times mol / 2-aminobutyronitrile]) 2-aminobutyramide Schiff base and 7-aminobutyramide 7 314.0 g of a reaction solution containing 0.77 g (0.08 mol [0.09 mol / 2-aminobutyronitrile]) was obtained.
Subsequently, this reaction solution and 93.3 g (0.92 mol) of 36% hydrochloric acid aqueous solution were contacted little by little while maintaining the solution temperature at 40 ° C. and the solution pH 4 to give 2-aminobutyramide hydrochloride 101. 5 g (0.73 mol) was obtained (yield 78.5% / 2-hydroxybutyronitrile basis).
After the dropwise addition, the mixture was cooled to 0 ° C. for further crystallization, and was then filtered to give 98.3 g (0.68 mol, purity 95.7%, ammonium chloride 4.3%) of 2-aminobutyramide hydrochloride. , Sodium chloride 0.00%) was obtained. The acquisition yield based on 2-hydroxybutyronitrile as a starting material was 73.0%, and the mother liquor loss was 5.5%. The impurity imidazolidinone was not detected. The water content of the mother liquor was 13.2%.
攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコに2-ヒドロキシブチロニトリル15.9g(0.18モル)を入れ、攪拌下、液温を約10℃に保ちながらアンモニアガス3.9g(0.23モル[1.3当量/2-ヒドロキシブチロニトリル])を吹き込んだ後、これを反応温度20℃にて8時間反応させたところ、2-アミノブチロニトリル水溶液19.8g(0.17モル[2-アミノブチロニトリル純度70.0%、水分17.0%、アンモニア分5.0%])が得られた。
この反応液に48%水酸化ナトリウム水溶液7.9g(0.10モル)を滴下し、常圧下で30分攪拌した。30分静置後、分液により上層液17.2g(0.17モル[2-アミノブチロニトリル純度80.6%、水分4.0%、アンモニア分4.0%])と下層液10.5g(水酸化ナトリウム濃度31.9%)に分取した。
続いて、分取した2-アミノブチロニトリルを含む上層液を、内圧600mmHgの減圧下で30分攪拌した後、常圧に戻したところ、2-アミノブチロニトリル水溶液16.7g(0.17モル、[2-アミノブチロニトリル純度83.0%、水分4.2%、アンモニア分1.0%])を得た。
続いて、攪拌機、温度計および凝縮器を備えた500mL容の四つ口フラスコに、アセトン43.4g(0.75モル)、48%水酸化ナトリウム水溶液0.3g(0.004モル[0.02当量/2-アミノブチロニトリル])を入れ、攪拌下、減圧処理をした2-アミノブチロニトリルを含む上層液16.7g(0.16モル)を滴下して、水酸化ナトリウム0.2%、水1.3%[0.24当量/2-アミノブチロニトリル]、2-アミノブチロニトリル21.6%、アセトン72.3%の仕込み比率よりなる反応基質液60.4gを調製した。これを反応温度20℃にて7時間反応させ、2-アミノブチルアミドシッフ塩基19.3g(0.14モル[0.85倍モル/2-アミノブチロニトリル])および2-アミノブチルアミド1.3g(0.01モル[0.08倍モル/2-アミノブチロニトリル])を含む反応液60.4gを得た。
次いで、この反応液と36%塩酸水溶液16.0g(0.16モル)を液温が40℃、液pHが4になるように保持しながら少量ずつ接触させて、2-アミノブチルアミド塩酸塩19.3g(0.14モル)を得た(収率78.5%/2-ヒドロキシブチロニトリル基準)。
滴下後、0℃まで冷却してさらに晶析を図った後、濾過によって2-アミノブチルアミド塩酸塩の白色結晶18.4g(0.13モル、純度99.2%、塩化アンモニウム0.8%、塩化ナトリウム0.00%)を得た。出発原料の2-ヒドロキシブチロニトリルに対する取得収率は73.9%、母液ロス4.6%であり、不純物のイミダゾリジノンは検出されなかった。また母液の含水率は12.8%だった。 Example 4
2-hydroxybutyronitrile (15.9 g, 0.18 mol) was placed in a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, and ammonia gas was maintained while maintaining the liquid temperature at about 10 ° C. with stirring. After blowing 3.9 g (0.23 mol [1.3 eq / 2-hydroxybutyronitrile]), this was reacted at a reaction temperature of 20 ° C. for 8 hours. As a result, an aqueous 2-aminobutyronitrile solution 19 0.8 g (0.17 mol [2-aminobutyronitrile purity 70.0%, moisture 17.0%, ammonia content 5.0%]) was obtained.
To this reaction solution, 7.9 g (0.10 mol) of a 48% aqueous sodium hydroxide solution was added dropwise and stirred for 30 minutes under normal pressure. After standing for 30 minutes, 17.2 g (0.17 mol [2-aminobutyronitrile purity: 80.6%, moisture: 4.0%, ammonia content: 4.0%]) and lower layer liquid 10 were separated by liquid separation. It was fractionated to 0.5 g (sodium hydroxide concentration 31.9%).
Subsequently, the separated upper layer liquid containing 2-aminobutyronitrile was stirred for 30 minutes under a reduced pressure of 600 mmHg and then returned to normal pressure. As a result, 16.7 g (0. 17 mol, [2-aminobutyronitrile purity: 83.0%, water content: 4.2%, ammonia content: 1.0%].
Subsequently, in a 500 mL four-necked flask equipped with a stirrer, a thermometer, and a condenser, 43.4 g (0.75 mol) of acetone and 0.3 g of a 48% sodium hydroxide aqueous solution (0.004 mol [.0. 02 equivalent / 2-aminobutyronitrile]) was added, and 16.7 g (0.16 mol) of an upper layer solution containing 2-aminobutyronitrile treated under reduced pressure was added dropwise with stirring. 60.4 g of a reaction substrate solution comprising 2%, water 1.3% [0.24 equivalent / 2-aminobutyronitrile], 2-aminobutyronitrile 21.6%, acetone 72.3% Prepared. This was reacted at a reaction temperature of 20 ° C. for 7 hours, and 19.3 g of 2-aminobutylamide Schiff base (0.14 mol [0.85 times mol / 2-aminobutyronitrile]) and 2-aminobutyramide 1 60.4 g of a reaction solution containing 3 g (0.01 mol [0.08-fold mol / 2-aminobutyronitrile]) was obtained.
Then, this reaction solution and 16.0 g (0.16 mol) of 36% hydrochloric acid aqueous solution were contacted little by little while maintaining the solution temperature at 40 ° C. and the solution pH at 4, to give 2-aminobutyramide hydrochloride. 19.3 g (0.14 mol) was obtained (yield 78.5% / 2-hydroxybutyronitrile basis).
After the dropwise addition, the mixture was cooled to 0 ° C. for further crystallization, followed by filtration to 18.4 g (0.13 mol, purity 99.2%, ammonium chloride 0.8%) of 2-aminobutyramide hydrochloride. , Sodium chloride 0.00%). The acquisition yield based on 2-hydroxybutyronitrile as a starting material was 73.9%, and the mother liquor loss was 4.6%. The impurity imidazolidinone was not detected. The water content of the mother liquor was 12.8%.
攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコに純水33.2g(1.84モル)を入れ、攪拌下、液温を約10℃に保ちながらアンモニアガス23.0g(1.35モル[2.0当量/2-ヒドロキシブチロニトリル])を吹き込んだ後、2-ヒドロキシブチロニトリル58.1g(0.68モル)を攪拌下、液温を約10℃に保ちながら、5時間で滴下した。これを反応温度20℃にて3時間反応させたところ、2-アミノブチロニトリル水溶液114.3g(0.60モル[2-アミノブチロニトリル純度44.7%、水分39.7%、アンモニア分10.3%])が得られた。
この反応液に48%水酸化ナトリウム水溶液62.5g(0.58モル)を滴下し、常圧下で30分攪拌した。30分静置後、分液により上層液71.3g(0.60モル[2-アミノブチロニトリル純度70.3%、水分12.8%、アンモニア分10.0%])と下層液105.5g(水酸化ナトリウム濃度28.4%)に分取した。
続いて、分取した2-アミノブチロニトリルを含む上層液を、内圧600mmHgの減圧下で30分攪拌した後、常圧に戻したところ、2-アミノブチロニトリル水溶液64.9g(0.60モル、[2-アミノブチロニトリル純度77.2%、水分14.0%、アンモニア分1.1%])を得た。
続いて、攪拌機、温度計および凝縮器を備えた500mL容の四つ口フラスコに、アセトン161.5g(2.78モル)、48%水酸化ナトリウム水溶液1.2g(0.014モル[0.02当量/2-アミノブチロニトリル])を入れ、攪拌下、減圧処理をした2-アミノブチロニトリルを含む上層液64.9g(0.60モル)を滴下して、水酸化ナトリウム0.2%、水4.0%[0.83当量/2-アミノブチロニトリル]、2-アミノブチロニトリル22.0%、アセトン71.0%の仕込み比率よりなる反応基質液227.6gを調製した。これを反応温度20℃にて7時間反応させ、2-アミノブチルアミドシッフ塩基68.3g(0.48モル[0.80倍モル/2-アミノブチロニトリル])および2-アミノブチルアミド8.0g(0.08モル[0.13倍モル/2-アミノブチロニトリル])を含む反応液227.6gを得た。
次いで、この反応液と36%塩酸水溶液60.0g(0.60モル)を液温が40℃、液pHが4になるように保持しながら少量ずつ接触させて、2-アミノブチルアミド塩酸塩74.0g(0.53モル)を得た(収率78.5%/2-ヒドロキシブチロニトリル基準)。
滴下後、0℃まで冷却してさらに晶析を図った後、濾過によって2-アミノブチルアミド塩酸塩の白色結晶67.9g(0.48モル、純度99.0%、塩化アンモニウム1.0%、塩化ナトリウム0.00%)を得た。出発原料の2-ヒドロキシブチロニトリルに対する取得収率は71.3%、母液ロス7.2%であり、不純物のイミダゾリジノンは検出されなかった。また母液の含水率は14.0%だった。 Example 5
Pure water 33.2 g (1.84 mol) was placed in a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, and ammonia gas 23.0 g (24.0 g) was maintained while maintaining the liquid temperature at about 10 ° C. with stirring. 1.35 mol [2.0 eq / 2-hydroxybutyronitrile]) was blown in, and 58.1 g (0.68 mol) of 2-hydroxybutyronitrile was stirred and the liquid temperature was kept at about 10 ° C. The solution was added dropwise over 5 hours. When this was reacted at a reaction temperature of 20 ° C. for 3 hours, 114.3 g of an aqueous 2-aminobutyronitrile solution (0.60 mol [purity of 2-aminobutyronitrile 44.7%, moisture 39.7%, ammonia Min 10.3%]) was obtained.
To this reaction solution, 62.5 g (0.58 mol) of 48% aqueous sodium hydroxide solution was added dropwise and stirred for 30 minutes under normal pressure. After standing for 30 minutes, 71.3 g (0.60 mol [2-aminobutyronitrile purity 70.3%, moisture 12.8%, ammonia content 10.0%]) and lower layer liquid 105 were separated by liquid separation. To 0.5 g (sodium hydroxide concentration 28.4%).
Subsequently, the separated upper layer liquid containing 2-aminobutyronitrile was stirred for 30 minutes under a reduced pressure of 600 mmHg and then returned to normal pressure. As a result, 64.9 g (0. 60 mol, [2-aminobutyronitrile purity 77.2%, moisture 14.0%, ammonia content 1.1%]).
Subsequently, 16500 g (2.78 mol) of acetone and 1.2 g of a 48% aqueous sodium hydroxide solution (0.014 mol [0. 14 mol [0. 0]) were added to a 500 mL four-necked flask equipped with a stirrer, a thermometer and a condenser. 02 equivalent / 2-aminobutyronitrile]) was added, and 64.9 g (0.60 mol) of an upper layer solution containing 2-aminobutyronitrile treated under reduced pressure was added dropwise with stirring. 227.6 g of a reaction substrate solution comprising 2%, water 4.0% [0.83 equivalent / 2-aminobutyronitrile], 2-aminobutyronitrile 22.0% and acetone 71.0% were charged. Prepared. This was reacted at a reaction temperature of 20 ° C. for 7 hours to give 68.3 g (0.48 mol [0.80-fold mol / 2-aminobutyronitrile]) of 2-aminobutyramide Schiff base and 2-aminobutyramide 8 The reaction liquid 227.6g containing 0.0g (0.08 mol [0.13 times mole / 2-aminobutyronitrile]) was obtained.
Then, this reaction solution and 60.0 g (0.60 mol) of 36% hydrochloric acid aqueous solution were contacted little by little while maintaining the solution temperature at 40 ° C. and the solution pH at 4, to give 2-aminobutyramide hydrochloride. 74.0 g (0.53 mol) was obtained (yield 78.5% / 2-hydroxybutyronitrile basis).
After the dropwise addition, the mixture was cooled to 0 ° C. and further crystallized, and then filtered, 67.9 g of white crystals of 2-aminobutyramide hydrochloride (0.48 mol, purity 99.0%, ammonium chloride 1.0%) , Sodium chloride 0.00%). The yield of the starting material 2-hydroxybutyronitrile was 71.3% and the mother liquor loss was 7.2%, and no impurity imidazolidinone was detected. The water content of the mother liquor was 14.0%.
攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコに2-ヒドロキシブチロニトリル117.4g(1.30モル)を入れ、攪拌下、液温を8±2℃に保ちながらアンモニアガス27.4g(1.61モル[1.2当量/2-ヒドロキシブチロニトリル])を添加し、これを反応温度20℃にて8時間反応させたところ、67.8%の2-アミノブチロニトリル水溶液144.8g(1.16モル[2-アミノブチロニトリル純度67.8%、水分17.0%、アンモニア分4.5%])が得られた。
次いで、攪拌機、温度計および凝縮器を備えた200mL容の四つ口フラスコにアセトン15.8g(0.27モル[0.23当量/2-アミノブチロニトリル])、25%水酸化ナトリウム水溶液10.7g(0.07モル[0.06当量/2-アミノブチロニトリル])及び水40.8g(2.27モル)を入れ、攪拌下、2-アミノブチロニトリル水溶液144.8g(1.16モル)を滴下して、水酸化ナトリウム1.3%、水34.1%[3.5当量/2-アミノブチロニトリル]、2-アミノブチロニトリル46.1%、アセトン7.5%の仕込み比率よりなる反応基質液212.1gを調製した。
これを反応温度20℃にて7時間反応させ、2-アミノブチルアミドシッフ塩基13.8g(0.10モル[0.08倍モル/2-アミノブチロニトリル])および2-アミノブチルアミド89.0g(0.87モル[0.75倍モル/2-アミノブチロニトリル])を含む反応液212.1gを得た。
その後36%塩酸137.0g(1.35モル)を8±2℃に保持しながら加え、2-アミノブチルアミド塩酸塩を130.0g(0.94モル)合成した(収率72.3%/2-ヒドロキシブチロニトリル基準)。その後、84℃、200mmHgで減圧濃縮を行い水分の除去をした後、アセトン243.6g(4.20モル)を滴下した。滴下後0℃まで冷却してさらに晶析を図った後、濾過によって2-アミノブチルアミド塩酸塩の薄黄色結晶115.6g(0.73モル、純度88.0%、塩化アンモニウム11.0%、塩化ナトリウム0.9%)の結晶を取得した。取得収率56.7%/2-ヒドロキシブチロニトリル基準、母液ロス11.3%/2-ヒドロキシブチロニトリル基準、不純物のイミダゾリジノンは検出されなかった。しかし、上記の濃縮操作により、イミダゾリジノン等の不純物が副生し、2-アミノブチルアミド塩酸塩の量は4.6%減少した。また母液の含水率は13.1%だった。
Into a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser, 117.4 g (1.30 mol) of 2-hydroxybutyronitrile was placed, and ammonia was maintained while maintaining the liquid temperature at 8 ± 2 ° C. with stirring. 27.4 g of gas (1.61 mol [1.2 eq / 2-hydroxybutyronitrile]) was added and reacted at a reaction temperature of 20 ° C. for 8 hours. As a result, 67.8% 2-amino 144.8 g (1.16 mol [2-aminobutyronitrile purity 67.8%, moisture 17.0%, ammonia content 4.5%]) of an aqueous solution of butyronitrile was obtained.
Next, 15.8 g of acetone (0.27 mol [0.23 equivalent / 2-aminobutyronitrile]), 25% aqueous sodium hydroxide solution was added to a 200 mL four-necked flask equipped with a stirrer, a thermometer and a condenser. 10.7 g (0.07 mol [0.06 equivalent / 2-aminobutyronitrile]) and 40.8 g (2.27 mol) of water were added, and 144.8 g of a 2-aminobutyronitrile aqueous solution was added with stirring. 1.16 mol) was added dropwise, sodium hydroxide 1.3%, water 34.1% [3.5 equivalents / 2-aminobutyronitrile], 2-aminobutyronitrile 46.1%, acetone 7 A reaction substrate solution 212.1 g having a charging ratio of 5% was prepared.
This was reacted at a reaction temperature of 20 ° C. for 7 hours, and 13.8 g of 2-aminobutyramide Schiff base (0.10 mol [0.08-fold mol / 2-aminobutyronitrile]) and 2-aminobutyramide 89 212.1 g of a reaction solution containing 0.0 g (0.87 mol [0.75 mol / 2-aminobutyronitrile]) was obtained.
Thereafter, 137.0 g (1.35 mol) of 36% hydrochloric acid was added while maintaining the temperature at 8 ± 2 ° C. to synthesize 130.0 g (0.94 mol) of 2-aminobutyramide hydrochloride (yield 72.3%). / 2-hydroxybutyronitrile standard). Then, after concentration under reduced pressure at 84 ° C. and 200 mmHg to remove moisture, 243.6 g (4.20 mol) of acetone was added dropwise. After dropwise addition, the mixture was cooled to 0 ° C. and further crystallized, and then filtered to give 115.6 g (0.73 mol, purity 88.0%, ammonium chloride 11.0%) of 2-aminobutyramide hydrochloride. , Sodium chloride 0.9%) was obtained. Acquisition yield 56.7% / 2-hydroxybutyronitrile standard, mother liquor loss 11.3% / 2-hydroxybutyronitrile standard, no impurity imidazolidinone was detected. However, impurities such as imidazolidinone were by-produced by the above concentration operation, and the amount of 2-aminobutyramide hydrochloride was reduced by 4.6%. The water content of the mother liquor was 13.1%.
Claims (17)
- 2-ヒドロキシブチロニトリル(1)から、2-アミノブチルアミド無機酸塩(5)を製造する方法において、該製造方法が以下に示す工程(A)、工程(B)、および工程(C)を含むことを特徴とする、2-アミノブチルアミド無機酸塩(5)の製造方法。
工程(A):2-ヒドロキシブチロニトリル(1)をアンモニアと反応させて、2-アミノブチロニトリル(2)を含む反応液を得る工程。
工程(B):工程(A)で得た反応液を、無機強塩基と、アセトンおよびメチルエチルケトンから選ばれる1種類以上のケトン系溶媒の存在下、2-アミノブチロニトリル(2)に対して水分量が3倍モル以下の条件で反応させ、反応液中に含まれていた2-アミノブチロニトリル(2)に対し、0.6倍モル以上の2-アミノブチルアミドシッフ塩基(3)と0.4倍モル以下の2-アミノブチルアミド(4)を含む反応液を得る工程。
工程(C):工程(B)で得た反応液に、無機酸または無機酸水溶液を加えて、2-アミノブチルアミド無機酸塩(5)を得る工程。
Step (A): A step of reacting 2-hydroxybutyronitrile (1) with ammonia to obtain a reaction solution containing 2-aminobutyronitrile (2).
Step (B): The reaction solution obtained in Step (A) is added to 2-aminobutyronitrile (2) in the presence of a strong inorganic base and one or more ketone solvents selected from acetone and methyl ethyl ketone. The reaction is carried out under conditions where the water content is 3 times mol or less, and the amount of 2-aminobutyramide Schiff base (3) is 0.6 times mol or more with respect to 2-aminobutyronitrile (2) contained in the reaction solution. And a step of obtaining a reaction solution containing 0.4-fold mol or less of 2-aminobutyramide (4).
Step (C): A step of adding the inorganic acid or the aqueous inorganic acid solution to the reaction solution obtained in the step (B) to obtain the 2-aminobutyramide inorganic acid salt (5).
- 工程(A)において、アンモニアとしてアンモニアガスを使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The method for producing a 2-aminobutyramide inorganic acid salt (5) according to claim 1, wherein ammonia gas is used as ammonia in the step (A).
- 工程(A)において、アンモニアを2-ヒドロキシブチロニトリル(1)に対して1.0~1.5倍モル使用する、請求項2に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The 2-aminobutyramide inorganic acid salt (5) according to claim 2, wherein ammonia is used in the step (A) in an amount of 1.0 to 1.5 times mol with respect to 2-hydroxybutyronitrile (1). Production method.
- 工程(A)において、アンモニアとしてアンモニア水を使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The method for producing a 2-aminobutyramide inorganic acid salt (5) according to claim 1, wherein ammonia water is used as ammonia in step (A).
- 工程(A)において、アンモニア水の濃度が35質量%以上であり、アンモニアを2-ヒドロキシブチロニトリル(1)に対して1.5~2.5倍モル使用する、請求項4に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 5. The step (A) according to claim 4, wherein the ammonia water has a concentration of 35% by mass or more, and ammonia is used in an amount of 1.5 to 2.5 times mol with respect to 2-hydroxybutyronitrile (1). A process for producing 2-aminobutyramide inorganic acid salt (5).
- 工程(B)において、2-アミノブチロニトリル(2)を含む反応液に無機強塩基または無機強塩基水溶液を加えることによって二層に分離させ、上層の有機相中に含まれていた水を下層の水相へ移行させた後に、上層の2-アミノブチロニトリル(2)を含む反応液を下層の無機強塩基水溶液より分取し、分取した反応液を反応に使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 In the step (B), the reaction solution containing 2-aminobutyronitrile (2) is separated into two layers by adding an inorganic strong base or an aqueous solution of strong inorganic base, and water contained in the upper organic phase is removed. The reaction liquid containing 2-aminobutyronitrile (2) in the upper layer is separated from the lower aqueous strong inorganic base solution after being transferred to the lower aqueous phase, and the separated reaction liquid is used for the reaction. 2. The process for producing a 2-aminobutyramide inorganic acid salt (5) according to 1.
- 2-アミノブチロニトリル(2)を含む反応液に対して、下層の無機強塩基水溶液中の無機強塩基濃度が15質量%を下回らないように無機強塩基または無機強塩基水溶液を加える、請求項6に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 An inorganic strong base or an inorganic strong base aqueous solution is added to the reaction solution containing 2-aminobutyronitrile (2) so that the concentration of the inorganic strong base in the lower inorganic strong base aqueous solution does not fall below 15% by mass. Item 7. A process for producing a 2-aminobutyramide inorganic acid salt (5) according to Item 6.
- 工程(B)において、2-アミノブチロニトリル(2)を含む反応液を30~760mmHgの減圧下で脱気してアンモニアを留去したものを反応に使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 2. The process according to claim 1, wherein in the step (B), the reaction liquid containing 2-aminobutyronitrile (2) is degassed under a reduced pressure of 30 to 760 mmHg to distill off ammonia, and used in the reaction. -Method for producing aminobutyramide inorganic acid salt (5).
- 工程(B)において、無機強塩基を、2-アミノブチロニトリル(2)に対し0.005~0.1倍モル使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The 2-aminobutyramide inorganic acid salt (5) according to claim 1, wherein in step (B), the inorganic strong base is used in an amount of 0.005 to 0.1 mol per mol of 2-aminobutyronitrile (2). ) Manufacturing method.
- 工程(B)において、無機強塩基として、水酸化ナトリウム、水酸化カリウムおよび水酸化カルシウムから選ばれる一種以上の無機強塩基を使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The 2-aminobutyramide inorganic acid salt according to claim 1, wherein in the step (B), at least one inorganic strong base selected from sodium hydroxide, potassium hydroxide and calcium hydroxide is used as the inorganic strong base. 5) Production method.
- 工程(B)において、ケトン系溶媒を、2-アミノブチロニトリル(2)に対し1.0~12.0倍モル使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The 2-aminobutyramide inorganic acid salt (5) according to claim 1, wherein in step (B), the ketone solvent is used in an amount of 1.0 to 12.0 times moles relative to 2-aminobutyronitrile (2). ) Manufacturing method.
- 工程(B)において、ケトン系溶媒がアセトンである、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The method for producing a 2-aminobutyramide inorganic acid salt (5) according to claim 1, wherein in the step (B), the ketone solvent is acetone.
- 工程(C)において、工程(B)で得た反応液を、無機酸または無機酸水溶液と、接触混合後の液pHが1~6になるような酸過剰な比率で接触させる、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 In the step (C), the reaction solution obtained in the step (B) is brought into contact with an inorganic acid or an inorganic acid aqueous solution at an acid excess ratio such that the solution pH after contact mixing is 1 to 6. A process for producing the 2-aminobutyramide inorganic acid salt (5) described in 1.
- 工程(C)において、無機酸または無機酸水溶液として、塩化水素ガスまたは20質量%以上の塩酸水溶液を使用する、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The method for producing a 2-aminobutyramide inorganic acid salt (5) according to claim 1, wherein, in step (C), hydrogen chloride gas or a 20% by mass or more hydrochloric acid aqueous solution is used as the inorganic acid or the inorganic acid aqueous solution.
- さらに、工程(C)で得られた2-アミノブチルアミド無機酸塩(5)を含む液をそのまま直接またはケトン系溶媒中に注加した後に晶析し、析出した結晶を固液分離する工程を含む、請求項1に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 Further, the step of crystallizing the liquid containing the 2-aminobutyramide inorganic acid salt (5) obtained in step (C) directly or after pouring into a ketone solvent, and separating the precipitated crystals into a solid-liquid separation The process for producing a 2-aminobutyramide inorganic acid salt (5) according to claim 1, comprising
- 母液の含水率が15質量%以下となる条件範囲下で、2-アミノブチルアミド無機酸塩(5)結晶の晶析と固液分離を行う、請求項15に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The 2-aminobutyramide inorganic substance according to claim 15, wherein the 2-aminobutyramide inorganic acid salt (5) crystals are crystallized and solid-liquid separated under a condition range in which the water content of the mother liquor is 15% by mass or less. Manufacturing method of acid salt (5).
- ケトン系溶媒がアセトンである、請求項15に記載の2-アミノブチルアミド無機酸塩(5)の製造方法。 The method for producing a 2-aminobutyramide inorganic acid salt (5) according to claim 15, wherein the ketone solvent is acetone.
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JPS5382707A (en) * | 1976-12-03 | 1978-07-21 | Anvar | Process for preparing alphaaaminoamid |
JPH0231694A (en) * | 1988-04-08 | 1990-02-01 | Idemitsu Kosan Co Ltd | Preparation of optically active alpha-amino acid and/or alpha-amino amide |
JP2001247529A (en) * | 2000-03-03 | 2001-09-11 | Mitsubishi Rayon Co Ltd | Method of producing alpha-amino acid amide |
JP2004099506A (en) * | 2002-09-09 | 2004-04-02 | Mitsubishi Rayon Co Ltd | Method for producing amino acid amide |
CN1583721A (en) * | 2003-08-20 | 2005-02-23 | 天津泰普药品科技发展有限公司 | Synthesis of (S)-alpha-ethyl-2-oxi-1-pentazane acetamide |
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JPS5382707A (en) * | 1976-12-03 | 1978-07-21 | Anvar | Process for preparing alphaaaminoamid |
JPH0231694A (en) * | 1988-04-08 | 1990-02-01 | Idemitsu Kosan Co Ltd | Preparation of optically active alpha-amino acid and/or alpha-amino amide |
JP2001247529A (en) * | 2000-03-03 | 2001-09-11 | Mitsubishi Rayon Co Ltd | Method of producing alpha-amino acid amide |
JP2004099506A (en) * | 2002-09-09 | 2004-04-02 | Mitsubishi Rayon Co Ltd | Method for producing amino acid amide |
CN1583721A (en) * | 2003-08-20 | 2005-02-23 | 天津泰普药品科技发展有限公司 | Synthesis of (S)-alpha-ethyl-2-oxi-1-pentazane acetamide |
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