JP5568137B2 - Method for producing amino acid amide derivative having fluorine-containing carbamate group, production intermediate thereof, and method for producing ethylenediamine derivative - Google Patents

Description

  The present invention relates to a method for producing an amino acid amide derivative having a fluorinated carbamate group, a production intermediate thereof, and a method for producing an ethylenediamine derivative.

  It is known that an amino acid amide derivative having a fluorine-containing carbamate group is useful as an intermediate of a bactericide as disclosed in Patent Document 1. In producing such a group of compounds, it is important to prepare efficiently from readily available amino acids.

  With respect to amino acid amide derivatives having a fluorine-containing carbamate group, examples of conventional production techniques include a method of reacting an amino acid amide with a chloroformic acid-containing fluorine-containing alkyl as shown in Patent Document 1. Here, the fluorine-containing alkyl chloroformate can be produced by a method of reacting a fluorine-containing alcohol and phosgene as shown in Patent Document 2.

  However, the above method uses an amino acid amide that is expensive and difficult to obtain in large quantities, which is economically disadvantageous. In addition, the reaction for synthesizing amino acid amides from amino acids generally requires a long time and has a low yield. Therefore, it is necessary to develop an efficient production method from an amino acid without going through an amino acid amide.

  Against this background, a method for efficiently producing an amino acid amide derivative having a fluorine-containing carbamate group has been demanded.

International Publication No. 2007/111024 US Pat. No. 3,742,010

Tetrahedron Letters No.20, pp2021-2024 (1972)

  An object of the present invention is to provide an advantageous method for industrial production of an amino acid amide derivative having a fluorine-containing carbamate group. Furthermore, an object of the present invention is to provide an advantageous method for industrial production of the ethylenediamine derivative having a fluorine-containing carbamate group and an acyl group, including the production process of the amino acid amide derivative.

  As a result of intensive studies, the present inventors have a fluorine-containing carbamate group represented by the general formula (3) obtained by reacting an inexpensive and readily available amino acid with a fluorine-containing alkyl chloroformate in the presence of water. The amino acid is converted into a compound represented by the general formula (1) by a chlorinating agent, and then reacted with ammonia, which is found to be an effective solution to the above-mentioned problem. And the present invention has been completed.

That is, the present invention is as follows.
[1] General formula (1)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and ring structure R ₃ and R ₄ are bonded by 2-5 carbon atoms It may be formed, or the R ₃ or either with R ₂ may form a ring structure linked with 3-4 carbon atoms.) And a compound represented by the R _4, is reacted with ammonia General formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above).

[2] In the formula (1), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl having 1 to 6 carbon atoms. R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group. In addition, the production method according to [1], wherein one of R ₃ and R ₄ and R ₂ may form a ring structure having 3 to 4 carbon atoms.
[3] General formula (3)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and ring structure R ₃ and R ₄ are bonded by 2-5 carbon atoms It may be formed, or R ₃ or either the R ₂ of R ₄ may form a ring structure linked with 3-4 carbon atoms.) And a compound represented by reaction with a chlorinating agent By the general formula (1)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with ammonia to give a compound of the general formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above).

[4] In the general formula (3), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl having 1 to 6 carbon atoms. R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group. In addition, the production method according to [3], wherein one of R ₃ and R ₄ and R ₂ may form a ring structure having 3 to 4 carbon atoms.
[5] General formula (4)

(Wherein R ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; R ₃ And R ₄ are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, substituted or unsubstituted Represents an unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and forms a ring structure in which R ₃ and R ₄ are bonded with 2 to 5 carbon atoms Or any one of R _{3 and} R ₄ and R ₂ may form a ring structure bonded with 3 to 4 carbon atoms) and the general formula (5)

(In the formula, R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, or a cycloalkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom.) Is reacted with a fluorine-substituted alkyl chloroformate represented by the general formula (3)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with a chlorinating agent to give a general formula (1)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with ammonia to give a compound of the general formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above).

[6] In the general formula (3), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl having 1 to 6 carbon atoms. R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group. In addition, the production method according to [5], wherein either R ₃ or R ₄ and R ₂ may form a ring structure having 3 to 4 carbon atoms.
[7] General formula (1)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and ring structure R ₃ and R ₄ are bonded by 2-5 carbon atoms It may be formed, or R ₃ or either the R ₂ of R ₄ may form a ring structure linked with 3-4 carbon atoms.) The compound represented by the.

[8] In the formula (1), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl having 1 to 6 carbon atoms. R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group. In addition, the compound according to [7], wherein either R ₃ or R ₄ and R ₂ may form a ring structure bonded with 3 to 4 carbon atoms.
[9] General formula (3 ′)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are simultaneously Except for the case of hydrogen, each independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, or a substituted or unsubstituted aryl group. , substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted heteroarylalkyl group, and, R ₃ and R ₄ are carbon It may be combined to form a ring structure in the child number 2-5, or R ₃ or either the R ₂ of R ₄ may form a ring structure linked with 3-4 carbon atoms.) A compound represented by

[10] In the formula (3 ′), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or 1 to 6 carbon atoms. Represents an alkyl group, and R ₃ and R ₄ are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted group, except when R ₃ and R ₄ are simultaneously hydrogen. Or an unsubstituted arylalkyl group, and the compound according to [9], which may form a ring structure in which either R ₃ or R ₄ and R ₂ are bonded with 3 to 4 carbon atoms .

[11] In the general formula (3 ′), R ₁ represents a trifluoroethyl group, R ₂ represents hydrogen or an alkyl group having 1 to 6 carbon atoms, and R ₃ and R ₄ are simultaneously hydrogen. Unless otherwise specified, each independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group, and R ₃ Alternatively, the compound according to [9], wherein either one of R ₄ and R ₂ may form a ring structure bonded with 3 to 4 carbon atoms.

[12] General formula (1)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and ring structure R ₃ and R ₄ are bonded by 2-5 carbon atoms It may be formed, or the R ₃ or either with R ₂ may form a ring structure linked with 3-4 carbon atoms.) And a compound represented by the R _4, is reacted with ammonia General formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (2) is reacted with an oxygen scavenger to obtain the general formula (6).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Subsequently, the compound represented by the general formula (6) is subjected to a catalytic hydrogenation reaction in the presence of an acid to obtain the general formula (7).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (7) is converted into the general formula (8).

Wherein R ₅ represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, An alkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group).

(Wherein R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are as described above).

[13] General formula (3)

(In the formula, R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom. R ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R _{3 4} is independently hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted. arylalkyl group, a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted heteroarylalkyl group, and, R ₃ and R ₄ are bonded by 2-5 carbon atoms May form a structure, or R ₃ or either of R ₄ and R ₂ chlorinating agent a compound represented by may.) Which also form a ring structure linked with 3-4 carbon atoms By reacting with general formula (1)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then the compound represented by the general formula (1) is reacted with ammonia in general. Formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (2) is reacted with an oxygen scavenger to obtain the general formula (6).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Subsequently, the compound represented by the general formula (6) is subjected to a catalytic hydrogenation reaction in the presence of an acid to obtain the general formula (7).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (7) is converted into the general formula (8).

Wherein R ₅ represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, An alkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group).

(Wherein R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are as described above).

[14] General formula (4)

(Wherein R ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; R ₃ And R ₄ are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, substituted or unsubstituted Represents an unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and forms a ring structure in which R ₃ and R ₄ are bonded with 2 to 5 carbon atoms Or any one of R _{3 and} R ₄ and R ₂ may form a ring structure bonded with 3 to 4 carbon atoms) and the general formula (5)

(In the formula, R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, or a cycloalkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom.) Is reacted with a fluorine-substituted alkyl chloroformate represented by the general formula (3)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with a chlorinating agent to give a general formula (1)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then the compound represented by the general formula (1) is reacted with ammonia in general. Formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (2) is reacted with an oxygen scavenger to obtain the general formula (6).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Subsequently, the compound represented by the general formula (6) is subjected to a catalytic hydrogenation reaction in the presence of an acid to obtain the general formula (7).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (7) is converted into the general formula (8).

Wherein R ₅ represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, An alkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group).

(Wherein R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are as described above).

  According to the present invention, a novel method for producing an amino acid amide derivative having a fluorine-containing carbamate group, a novel production intermediate, and a novel method for producing the amino acid amide derivative of the present invention are included as part of the process. A novel method for producing an ethylenediamine derivative having a group and an acyl group can be provided. Furthermore, the present invention has advantages such as maintaining the three-dimensional structure of amino acids, reducing industrial waste, and producing in good yield. Therefore, the present invention is excellent in environmental adaptability, economy, safety, and productivity, and is useful as an industrial manufacturing method.

Hereinafter, the present invention will be described in detail.
<Method for producing amino acid amide derivative>

  The method for producing an amino acid amide derivative having a fluorine-containing carbamate group (compound of general formula (2)) according to the present invention is a novel production intermediate represented by general formula (1) as shown in the following reaction formula (1). ) Is reacted with ammonia.

In the compound represented by the general formula (1), R ₁ is an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, or 3 to 6 carbon atoms substituted with at least one fluorine atom. Represents a cycloalkyl group.

In the general formula (1), R ₁ is an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, which is a methyl group, an ethyl group, a propyl group, or butyl. Group, pentyl group, hexyl group and the like, isopropyl group, isobutyl group, sec-butyl group, 1-methylbutyl group, 2-methylbutyl group, 3-methylbutyl group, 1,1-dimethylpropyl group, 2,2-dimethylpropyl group, 1,2-dimethylpropyl group, 1-methylpentyl group, 2-methylpentyl group, 3-methylpentyl group, 4-methylpentyl group, 1,1-dimethylbutyl group, 1, A branched group such as a 2-dimethylbutyl group, a 1,3-dimethylbutyl group, a 2,2-dimethylbutyl group, a 2,3-dimethylbutyl group, and a 3,3-dimethylbutyl group are represented. It is sufficient that at least one hydrogen atom of these alkyl groups is substituted with a fluorine atom.

In the general formula (1), R ₁ is a cycloalkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom. The cycloalkyl group having 3 to 6 carbon atoms includes a cyclopropyl group, a cyclobutyl group, and cyclopentyl. Group, cyclohexyl group and the like.

In the compound represented by the general formula (1), R ₂ is hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted group. Represents a heteroaryl group.

The alkyl group having 1 to 6 carbon atoms in R ₂ in the general formula (1) in the same meanings as those described in R ₁ in the formula (1).

The cycloalkyl group having 3 to 6 carbon atoms in R ₂ in the general formula (1) in the same meanings as those described in R ₁ in the formula (1).

The substituted or unsubstituted aryl group in R ₂ in the general formula (1) or the substituent in the substituted or unsubstituted heteroaryl group is a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, or isobutyl. Group, alkyl group such as sec-butyl group, cycloalkyl group such as cyclopropyl group, cyclobutyl group, cyclopentyl group and cyclohexyl group, fluorine such as trifluoromethyl group, difluoromethyl group, bromodifluoromethyl group and trifluoroethyl group Fluorine-substituted alkoxy such as substituted alkyl groups, methoxy groups, ethoxy groups, propoxy groups, isopropoxy groups, butoxy groups, isobutoxy groups, sec-butoxy groups, etc., trifluoromethoxy groups, difluoromethoxy groups, trifluoroethoxy groups, etc. Group, methoxycarbonyl group, ethoxycal Bonyl group, propoxycarbonyl group, isopropoxycarbonyl group, butoxycarbonyl group, isobutoxycarbonyl group, alkoxycarbonyl group such as sec-butoxycarbonyl group, phenoxycarbonyl group, aryloxycarbonyl group, methanesulfonyl group, ethanesulfonyl group , Alkylsulfonyl groups such as propanesulfonyl group and butanesulfonyl group, fluorine-substituted alkylsulfonyl groups such as trifluoromethanesulfonyl group, difluoromethanesulfonyl group and trifluoroethanesulfonyl group, methylcarbonyl group, ethylcarbonyl group, propylcarbonyl group, isopropyl Alkylcarbonyl groups such as carbonyl groups, cyclopropylcarbonyl groups, cyclobutylcarbonyl groups, cyclopentylcarbonyl groups, cyclohexylcarbonyl groups, etc. Arylcarbonyl groups such as cycloalkylcarbonyl group, benzoyl group, methylcarbonyloxy group, ethylcarbonyloxy group, propylcarbonyloxy group, alkylcarbonyloxy group such as isopropylcarbonyloxy group, cyclopropylcarbonyloxy group, cyclobutylcarbonyloxy group And cycloalkylcarbonyloxy groups such as cyclopentylcarbonyloxy group and cyclohexylcarbonyloxy group, and arylcarbonyloxy groups such as benzoyloxy group. The number of substituents on the aryl group or heteroaryl group is not limited. Further, when two or more aryl groups or heteroaryl groups are substituted, they may be composed of the same or two or more kinds of substituents, and are not limited.

The aryl group in R ₂ in the general formula (1) represents a phenyl group, a naphthyl group, an anthranyl group, a phenanthryl group, or the like.

The heteroaryl group in R ₂ in the general formula (1) is nitrogen-containing such as pyridyl group, pyrimidyl group, pyrazolyl group, pyrazinyl group, pyridazinyl group, imidazolyl group, indolyl group, quinolyl group, quinoxalyl group, benzimidazolyl group, etc. Heterocyclic group, tetrahydrofuranyl group, furanyl group, pyranyl group, dioxanyl group, 2,3-dihydrobenzo [1,4] dioxinyl group, benzoxazolyl group, benzisoxazolyl group, etc. Examples include a heterocyclic group containing an atom.

In the compound represented by the general formula (1), R ₃ and R ₄ are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted carbon group having 3 to 6 carbon atoms. It represents a cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group. In addition, a ring structure in which R ₃ and R ₄ are bonded with 2 to 5 carbon atoms may be formed, or either R ₃ or R ₄ and R ₂ are bonded with 3 to 4 carbon atoms. A ring structure may be formed. The number of carbon atoms does not include the carbon atom to which R ₃ and R ₄ are bonded.

A substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group in R ₃ and R ₄ in the general formula (1) , A substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituent in a substituted or unsubstituted heteroarylalkyl group is a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, Alkyl groups such as isobutyl group, sec-butyl group, cycloalkyl groups such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, trifluoromethyl group, difluoromethyl group, bromodifluoromethyl group, trifluoroethyl group, etc. Fluorine-substituted alkyl group, methoxy group, ethoxy group, propoxy group, isopropoxy , Butoxy group, isobutoxy group, alkoxy group such as sec-butoxy group, fluorine-substituted alkoxy group such as trifluoromethoxy group, difluoromethoxy group, trifluoroethoxy group, methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group, iso Propoxycarbonyl group, butoxycarbonyl group, isobutoxycarbonyl group, sec-butoxycarbonyl group and other alkoxycarbonyl groups, phenoxycarbonyl group, aryloxycarbonyl group, methanesulfonyl group, ethanesulfonyl group, propanesulfonyl group, butanesulfonyl group, etc. Fluorine-substituted alkylsulfonyl groups such as alkylsulfonyl group, trifluoromethanesulfonyl group, difluoromethanesulfonyl group, trifluoroethanesulfonyl group, methylcarbonyl group, ethyl An alkylcarbonyl group such as a bonyl group, a propylcarbonyl group, an isopropylcarbonyl group, a cyclopropylcarbonyl group, a cyclobutylcarbonyl group, a cyclopentylcarbonyl group, a cycloalkylcarbonyl group such as a cyclohexylcarbonyl group, an arylcarbonyl group such as a benzoyl group, a methylcarbonyl group Cycloalkylcarbonyl such as alkylcarbonyloxy group such as oxy group, ethylcarbonyloxy group, propylcarbonyloxy group, isopropylcarbonyloxy group, cyclopropylcarbonyloxy group, cyclobutylcarbonyloxy group, cyclopentylcarbonyloxy group, cyclohexylcarbonyloxy group Arylcarbonyloxy groups such as oxy group and benzoyloxy group, halogen atoms such as fluorine, chlorine, bromine and iodine It is exemplified. When there are two or more substituents for the alkyl group, cycloalkyl group, aryl group, arylalkyl group, heteroaryl group, or heteroarylalkyl group, they may be composed of the same or two or more kinds of substituents. There is no limit.

The alkyl group having 1 to 6 carbon atoms in _{R 3} or _{R 4} in general formula (1), the same meaning as described in _{R 1} in the formula (1).

The cycloalkyl group having 3 to 6 carbon atoms in R ₃ or R ₄ in the general formula (1) has the same meaning as that described for R ₁ in the general formula (1).

The aryl group in R ₃ or R ₄ in the general formula (1) has the same meaning as that described for R ₁ in the general formula (1).

As for the arylalkyl group in R ₃ or R ₄ in the general formula (1), the aryl moiety has the same meaning as the aryl group described in R ₂ in the general formula (1), and the alkyl moiety has 1 to 4 carbon atoms. Represents a thing.

The heteroaryl group in R ₃ or R ₄ in the general formula (1) has the same meaning as that described for R ₂ in the general formula (1).

The heteroarylalkyl group in R ₃ or R ₄ in the general formula (1) is the same as the heteroaryl group described in R ₂ in the general formula (1), and the alkyl moiety has 1 carbon atom. Represents ~ 4.

In General Formula (1), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, R ₂ represents hydrogen or an alkyl group having 1 to 6 carbon atoms, and R ₃ And R ₄ preferably each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group. A ring structure in which either R ₃ or R ₄ and R ₂ are bonded with 3 to 4 carbon atoms may be formed.

  When the compound represented by the general formula (1) has an asymmetric point, an optically active substance or a racemate can be used.

In the compound represented by the general formula (2), R ₁ , R ₂ , R ₃ and R ₄ have the same meaning as described in the general formula (1).

  By reacting the compound represented by the general formula (1) as described above with ammonia, the compound can be converted into the compound represented by the general formula (2).

  Although the usage-amount of ammonia will not be specifically limited if it is an equivalent or more with respect to the compound represented by General formula (1), 1 to 15 equivalent is preferable from an economical viewpoint.

  When reacting the compound represented by the general formula (1) with ammonia, a base can be used.

  Examples of the base used include inorganic bases such as sodium hydroxide, potassium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium carbonate, potassium carbonate, pyridine, triethylamine, diisopropylethylamine, tributylamine, and 1,8-diazabicyclo [5. , 4,0] -undec-7-ene, 1,4-diazabicyclo [2,2,0] octane and other organic bases. It can also be used alone, or two or more types can be mixed in an arbitrary ratio.

  The amount of the base used may not be used at all, or may be 1 equivalent or more based on the compound represented by the general formula (1). The upper limit is preferably 10 equivalents or less from the economical viewpoint.

  The solvent used when reacting the compound represented by the general formula (1) and ammonia is not particularly limited as long as the compound represented by the general formula (2) is generated. Specific examples of the solvent include halogen solvents such as dichloromethane and chloroform, aromatic solvents such as benzene, toluene and xylene, hydrocarbon solvents such as hexane and heptane, dimethylformamide, dimethylacetamide and 1-methyl-2-pyrrolidone. Amide solvents such as 1,3-dimethyl-2-imidazolidinone, urea solvents such as 1,3-dimethyl-3,4,5,6-tetrahydro-2 (1H) -pyrimidinone, diethyl ether, diisopropyl Examples include ether solvents such as ether, 1,2-dimethoxyethane, tetrahydrofuran and dioxane, ester solvents such as ethyl acetate, butyl acetate and isopropyl acetate, and water. These solvents can be used alone, or two or more kinds can be mixed in an arbitrary ratio.

  Although the usage-amount of a solvent is not specifically limited, Usually, it is 2 times weight or more and 40 times weight or less with respect to the compound represented by General formula (1).

  Regarding the reaction temperature at the time of reacting the compound represented by the general formula (1) and ammonia, it is particularly limited if the compound represented by the general formula (1) and (2) is set so as not to decompose. Usually, it is −10 ° C. or more and 80 ° C. or less or the boiling point of the solvent or less. However, when the compounds represented by the general formulas (1) and (2) have an asymmetric point, they are racemized when heated in the presence of excess ammonia, and therefore, 40 ° C. or lower is desirable.

  In the present invention, as shown in the following reaction formula (2), the compound represented by the general formula (3), which is a novel production intermediate, is reacted with a chlorinating agent to give a general formula (1). The compound represented by the general formula (2) can be produced by converting to a compound represented by the formula (2) and then reacting with ammonia.

In the compound represented by the general formula (3), R ₁ , R ₂ , R ₃ and R ₄ have the same meaning as described in the general formula (1).

  The chlorinating agent to be used is not limited as long as it does not decompose the compound represented by the general formula (3) or the general formula (1). For example, thionyl chloride, base oxalyl, phosphorus oxychloride, phosphorus pentachloride, Phosgene, Vilsmeier reagent, etc. can be used.

  The amount of the chlorinating agent is not limited as long as the intended reaction proceeds, but is usually 1 equivalent or more and 20 equivalents or less with respect to the compound of the general formula (3).

  The solvent used in the reaction for obtaining the compound represented by the general formula (1) is not particularly limited as long as the reaction proceeds. Specific examples include aromatic solvents such as benzene, toluene and xylene, hydrocarbon solvents such as hexane and heptane, amide solvents such as dimethylformamide, dimethylacetamide and 1-methyl-2-pyrrolidone, diethyl ether and diisopropyl ether. Examples include ether solvents such as 1,2-dimethoxyethane, tetrahydrofuran and dioxane, and ester solvents such as ethyl acetate, butyl acetate and isopropyl acetate. These solvents can be used alone, or two or more kinds can be mixed in an arbitrary ratio.

  The amount of the solvent used is not particularly limited, but usually a weight of 1 to 40 times the weight of the general formula (3) is preferable.

  Although the reaction form is not particularly limited, it is preferable to add a chlorinating agent to general formula (3) or general formula (3) diluted with the above solvent.

  The reaction temperature is not particularly limited as long as it is set so as not to decompose the compound, but is usually −10 ° C. or higher and 100 ° C. or lower or the boiling point of the solvent or lower.

  With respect to the compound represented by the general formula (1) obtained by the above reaction, the usage pattern in the next step is not particularly limited. The reaction solution containing the compound represented by the general formula (1) can be used in the next step without isolation and purification after performing a normal post-treatment operation such as solvent distillation, It can be used in the next process as it is.

  Hereinafter, a method for preparing the compound represented by the general formula (3) will be described.

  The compound represented by the general formula (3) is obtained by reacting an amino acid with a fluorine-substituted alkyl chloroformate in the presence of water, as in Non-Patent Document 1. As the fluorine-substituted alkyl chloroformate, a commercially available product or one synthesized by the method of Patent Document 2 can be used.

  As a method for preparing the compound represented by the general formula (3), an amino acid is dissolved in water, and a fluorine-substituted alkyl chloroformate is dropped and reacted while keeping the pH of the reaction solution at 11 to 13. , Can be obtained efficiently.

  As an example of the compound represented by the general formula (3), a compound represented by the general formula (3 ′) can be used.

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are simultaneously Except for the case of hydrogen, each independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, or a substituted or unsubstituted aryl group. , substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted heteroarylalkyl group, and, R ₃ and R ₄ are carbon It may be combined to form a ring structure in the child number 2-5, or R ₃ or either the R ₂ of R ₄ may form a ring structure linked with 3-4 carbon atoms.)

In the general formula (3 ′), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl group having 1 to 6 carbon atoms. R ₃ and R ₄ are each independently hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted aryl group, or substituted or unsubstituted, except when R ₃ and R ₄ are simultaneously hydrogen. It is preferably a compound that may form a ring structure in which either R ₃ or R ₄ and R ₂ are bonded with 3 to 4 carbon atoms.

Further, in the general formula (3 ′), R ₁ represents a trifluoroethyl group, R ₂ represents hydrogen or an alkyl group having 1 to 6 carbon atoms, and R ₃ and R ₄ are simultaneously hydrogen. Each independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group, and R ₃ or More preferably, the compound may form a ring structure in which either one of R ₄ and R ₂ are bonded with 3 to 4 carbon atoms.

  When the compound represented by the general formula (4) is used as the amino acid, the compound represented by the general formula (2) that is the target compound can be produced. Specifically, as shown in the following reaction formula (3), a novel compound is obtained by reacting a compound represented by the general formula (4) with a fluorine-substituted alkyl chloroformate represented by the general formula (5). A compound represented by the general formula (3) which is a production intermediate is obtained. Then, the compound represented by the general formula (3) is converted to the compound represented by the general formula (1) by reacting with the chlorinating agent, and then reacted with ammonia to represent the compound represented by the general formula (2). Can be produced.

R ₂ , R ₃ and R ₄ in the compound represented by the general formula (4) are synonymous with those described in the general formula (1), and R ₁ in the compound represented by the general formula (5) is represented by the general formula It is synonymous with what was described in (1). As the chlorinating agent, those described above can be used.

  The compound represented by the general formula (4) is dissolved in water, and the fluorine-substituted alkyl chloroformate represented by the general formula (5) is dropped and reacted while maintaining the pH of the reaction solution at 11-13. be able to. Moreover, it is also possible to manufacture without isolation and purification from the compound represented by the general formula (4) to the compound represented by the general formula (2).

  As described above, it has become possible to efficiently produce a compound represented by the general formula (2), that is, an amino acid amide derivative having a fluorine-containing carbamate group.

<New production method of ethylenediamine derivative>

  The method for producing an ethylenediamine derivative having a fluorine-containing carbamate group and an acyl group (a compound of the general formula (9)) according to the present invention is represented by the above reaction formulas (1) to ( The amino acid amide derivative having a fluorine-containing carbamate group (compound of general formula (2)) obtained by any one of methods 3) is converted to a compound represented by general formula (6) by reacting with an oxygen scavenger. . Next, the compound represented by the general formula (6) is converted into the compound represented by the general formula (7) by performing a catalytic hydrogenation reaction in the presence of an acid, and then the compound represented by the general formula (7). Can be reacted with a compound represented by the general formula (8) to produce a compound represented by the general formula (9).

  First, the compound represented by general formula (6) is prepared by reacting the compound represented by general formula (2) with an oxygen scavenger.

Hereinafter, the reaction between the compound represented by the general formula (2) and the oxygen scavenger will be described.
R ₁ , R ₂ , R ₃ and R ₄ in the compound represented by the general formula (2) have the same meaning as described in the general formula (1).

  An oxygen scavenger is a halogenating agent such as thionyl chloride, oxalyl chloride, phosgene, phosphorus oxychloride, phosphorus trichloride, phosphorus pentachloride, thionyl bromide, phosphorus tribromide, mesyl chloride, tosyl chloride, N, N Carbodiimide derivatives such as' -dicyclohexylcarbodiimide, N, N'-diisopropylcarbodiimide, 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride, anhydrides such as acetic anhydride, trifluoroacetic anhydride, Vilsmeier reagent, etc. It is.

  Vilsmeier reagent is a general formula (10) prepared from a formamide derivative such as dimethylformamide and a halogenating agent.

(Wherein R ₆ and R ₇ each independently represents an alkyl group having 1 to 3 carbon atoms, and Y represents a halogen atom).
The compound represented by the general formula (10) includes a salt derived from a halogenating agent.

The alkyl group having 1 to 3 carbon atoms in R ₆ and R ₇ in the general formula (10) represents a methyl group, an ethyl group, a propyl group, or the like.

  The halogen atom for Y in the general formula (10) is fluorine, chlorine, bromine, iodine or the like.

  The usage form of the oxygen scavenger is not particularly limited, and either a method of adding the oxygen scavenger to the substrate or a method of adding the oxygen scavenger to the substrate may be used.

  The form of use when the oxygen scavenger is a Vilsmeier reagent is not particularly limited. A method of adding a compound represented by general formula (2) after preparing a Vilsmeier reagent in a solvent in advance, or introducing a halogenating agent into a solvent containing a compound represented by general formula (2) and a formamide derivative Can be done in a way.

  Although there will be no restriction | limiting in particular if the usage-amount of an oxygen scavenger will be 1 equivalent or more with respect to the compound represented by General formula (2), Usually, it is 1 equivalent or more and 10 equivalent or less.

  The amount used when the oxygen scavenger is a Vilsmeier reagent is not particularly limited as long as the halogenating agent is 1 equivalent or more with respect to the compound represented by the general formula (2) and the formamide derivative is a catalyst amount or more. . Usually, the halogenating agent is 1 equivalent or more and 10 equivalents or less, and the formamide derivative is 0.1 equivalent or more and 10 equivalents or less with respect to the compound represented by the general formula (2). In addition, the formamide derivative can be used as a solvent.

  The solvent used when converting the compound represented by the general formula (2) to the compound represented by the general formula (6) is not particularly limited as long as it is an aprotic solvent. Specifically, halogen solvents such as dichloromethane and chloroform, aromatic solvents such as benzene, toluene and xylene, hydrocarbon solvents such as hexane and heptane, dimethylformamide, dimethylacetamide, 1-methyl-2-pyrrolidone, etc. Amide solvents such as diethyl ether, diisopropyl ether, 1,2-dimethoxyethane, tetrahydrofuran, dioxane and the like, nitrile solvents such as acetonitrile and propionitrile, 1,3-dimethyl-2-imidazolidinone, And urea solvents such as 1,3-dimethyl-3,4,5,6-tetrahydro-2 (1H) -piperidinone, and ester solvents such as ethyl acetate, butyl acetate and isopropyl acetate. It is also possible to use it alone, and it is also possible to use a mixture of two or more solvents in an arbitrary ratio.

  Of the oxygen scavengers used in the present invention, the Vilsmeier reagent is preferably applicable.

  The amount of the solvent used is not particularly limited, but usually 3 to 40 times the weight of the compound represented by the general formula (2) is preferable.

  Although the reaction temperature at the time of converting from the compound represented by the general formula (2) to the compound represented by the general formula (6) is not particularly limited as long as the reaction proceeds, it is −10 ° C. or more and 150 It is not higher than ° C or the boiling point of the solvent. By such a simple reaction, the compound represented by the general formula (6) can be obtained in high yield. Therefore, it is useful as an industrial production method for the compound represented by the general formula (6).

Subsequently, the obtained compound represented by the general formula (6) can be converted into a compound represented by the general formula (7) by performing a catalytic hydrogenation reaction in the presence of an acid.
Thereby, the production | generation of a by-product is suppressed and the compound represented by General formula (7) can be obtained with a high yield.

In the compound represented by the general formula (7), R ₁ , R ₂ , R ₃ and R ₄ have the same meaning as described in the general formula (1).

  The acid to be used is not limited as long as it does not decompose the compound represented by the general formula (6) or the general formula (7). For example, an organic acid or an inorganic acid can be used.

  Examples of the organic acid include formic acid, acetic acid, methanesulfonic acid, and the like, and examples of the inorganic acid include hydrochloric acid, sulfuric acid, phosphoric acid, and the like.

  Although the usage-amount of an acid will not be restrict | limited if it sets so that the target reaction may advance, it is 1 equivalent or more and 20 equivalent or less normally.

  Examples of the catalytic hydrogenation method include a method using metals such as palladium, platinum, rhodium and ruthenium. These metals can also be used in the form of metal oxides, metal chlorides and the like.

  The amount of metals used in the catalytic hydrogenation method is not particularly limited as long as the reaction proceeds, but is preferably equal to or less than the weight of the general formula (6) from the economical viewpoint.

As the form of the metal to be used, those supported by activated carbon, SiO ₂ , Al ₂ O ₃ , BaSO ₄ , TiO ₂ , ZrO ₂ , MgO, ThO ₂ , diatomaceous earth, or the like can be used. Although the form is not ask | required, it is preferable to use the reusable support body from an economical viewpoint.

  The solvent used when performing the catalytic hydrogenation method is not particularly limited as long as the reaction proceeds. Specific examples include alcohol solvents such as methanol, ethanol and isopropanol, aromatic solvents such as benzene, toluene and xylene, hydrocarbon solvents such as hexane and heptane, dimethylformamide, dimethylacetamide and 1-methyl-2-pyrrolidone. Amide solvents such as diethyl ether, diisopropyl ether, 1,2-dimethoxyethane, tetrahydrofuran, dioxane and the like, ester solvents such as ethyl acetate, butyl acetate and isopropyl acetate, and water. It can also be used alone, or two or more types can be mixed in an arbitrary ratio.

  The amount of the solvent used is not particularly limited, but usually 3 to 40 times the weight of the general formula (6) is preferable.

  Although the reaction form is not particularly limited, it is preferable to add the general formula (6) or the general formula (6) diluted with the above solvent dropwise to a solvent containing a metal and an acid in the presence of a hydrogen source.

  The reaction temperature is not particularly limited as long as it is set so as not to decompose the compound, but is usually −10 ° C. or higher and 150 ° C. or lower or the boiling point of the solvent or lower.

  The reaction pressure is not particularly limited and may be normal pressure or increased pressure.

  The hydrogen source used for catalytic hydrogenation is not particularly limited as long as the reaction proceeds. However, in addition to hydrogen gas, an internal hydrogen generation method using cyclohexene, formic acid, formate, or the like can be used. .

  The cyclohexene, formic acid, and formate equivalents used for the reaction by the internal hydrogen generation method are not particularly limited as long as the amount of hydrogen to be generated is set to be 2 equivalents or more, but 2 equivalents from an economic viewpoint. The amount is preferably 10 equivalents or less.

  Regarding the compound represented by the general formula (7) obtained by the above reaction, the use form in the next step is not particularly limited. The reaction solution containing the compound represented by the general formula (7) can be used in the next step without performing isolation and purification after performing usual post-treatment operations such as solvent distillation and liquid separation. In the next step, inorganic acids such as hydrochloric acid, sulfuric acid and phosphoric acid, and organic acids such as oxalic acid, fumaric acid, maleic acid, formic acid, acetic acid and methanesulfonic acid can be used in the next step. is there.

  The compound represented by the general formula (7) includes salts formed with inorganic acids and organic acids. Examples of the inorganic acid include hydrochloric acid, sulfuric acid, and phosphoric acid, and examples of the organic acid include oxalic acid, fumaric acid, maleic acid, formic acid, acetic acid, methanesulfonic acid, and the like.

  By converting the compound represented by the general formula (7) obtained by the above step and the compound represented by the general formula (8) into a compound represented by the general formula (9). Can do.

R ₅ in the compound represented by the general formula (8) is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, or a substituted or unsubstituted aryl. Represents a group, a substituted or unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group.

In R ₅ , a substituted alkyl group having 1 to 6 carbon atoms, a substituted cycloalkyl group having 3 to 6 carbon atoms, a substituted aryl group, a substituted arylalkyl group, a substituted heteroaryl group, or Substituents in a substituted heteroarylalkyl group include methyl groups, ethyl groups, propyl groups, isopropyl groups, butyl groups, isobutyl groups, sec-butyl groups and other alkyl groups, cyclopropyl groups, cyclobutyl groups, cyclopentyl groups, cyclohexyl Group such as cycloalkyl group, trifluoromethyl group, difluoromethyl group, bromodifluoromethyl group, trifluoroethyl group and other halogen-substituted alkyl groups, methoxy group, ethoxy group, propoxy group, isopropoxy group, butoxy group, isobutoxy group , Alkoxy groups such as sec-butoxy group, cyclopropyl Cycloalkoxy groups such as poxy group, cyclobutoxy group, cyclopentyloxy group, cyclohexyloxy group, halogen-substituted alkoxy groups such as trifluoromethoxy group, difluoromethoxy group, trifluoroethoxy group, methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl Group, isopropoxycarbonyl group, butoxycarbonyl group, isobutoxycarbonyl group, alkoxycarbonyl group such as sec-butoxycarbonyl group, cyclopropoxycarbonyl group, cyclobutoxycarbonyl group, cyclopentyloxycarbonyl group, cyclohexyloxycarbonyl group, etc. Aryloxycarbonyl groups such as carbonyl group and phenoxycarbonyl group, methylthio group, ethylthio group, propylthio group, butylthio group, etc. Alkylthio group, trifluoromethylthio group, difluoromethylthio group, halogen-substituted alkylthio group such as trifluoroethylthio group, methanesulfinyl group, ethanesulfinyl group, propanesulfinyl group, alkylsulfinyl group such as butanesulfinyl group, trifluoromethanesulfinyl group, Halogen-substituted alkylsulfinyl groups such as difluoromethanesulfinyl group and trifluoroethanesulfinyl group, alkylsulfonyl groups such as methanesulfonyl group, ethanesulfonyl group, propanesulfonyl group and butanesulfonyl group, trifluoromethanesulfonyl group, difluoromethanesulfonyl group, tri Halogen-substituted alkylsulfonyl group such as fluoroethanesulfonyl group, methylcarbonyl group, ethylcarbonyl, propylcarbo Alkyl group, such as alkyl group, isopropylcarbonyl group, cyclopropylcarbonyl group, cyclobutylcarbonyl group, cyclopropylcarbonyl group, cyclopentylcarbonyl group, cyclohexylcarbonyl group such as cyclohexylcarbonyl group, arylcarbonyl group such as benzoyl group, etc. Alkylcarbonyloxy groups such as methylcarbonyloxy group, ethylcarbonyloxy group, propylcarbonyloxy group, isopropylcarbonyloxy group, cyclopropylcarbonyloxy group, cyclobutylcarbonyloxy group, cyclopentylcarbonyloxy group, cyclohexylcarbonyloxy group, etc. Arylcarbonyloxy groups such as alkylcarbonyloxy groups and benzoyloxy groups, and halogen sources such as chlorine, fluorine, bromine and iodine A child is illustrated. The number of substituents on the aryl group or heteroaryl group is not limited. Further, when two or more aryl groups or heteroaryl groups are substituted, they may be composed of the same or two or more kinds of substituents, and are not limited.

The alkyl group having 1 to 6 carbon atoms in R ₅ in the general formula (8), the same meanings as those described in R ₁ in the formula (1).

The cycloalkyl group having 3 to 6 carbon atoms in R ₅ in the general formula (8), the same meanings as those described in R ₁ in the formula (1).

The aryl group in R ₅ in the general formula (8) has the same meaning as that described for R ₂ in the general formula (1).

For an arylalkyl group in R ₅ in the general formula (8), the aryl moiety has the same meaning as the aryl groups mentioned in the general formula (1) in R _2, an alkyl moiety meanings of 1 to 4 carbon atoms.

The heteroaryl group in R ₅ in the general formula (8) is nitrogen-containing such as pyridyl group, pyrimidyl group, pyrazolyl group, pyrazinyl group, pyridazinyl group, imidazolyl group, indolyl group, quinolyl group, quinoxalyl group, benzimidazolyl group, etc. Sulfur-containing heterocycles such as heterocyclic groups, tetrahydrothienyl groups, thienyl groups, thiopyranyl groups, benzothienyl groups, tetrahydrofuranyl groups, furanyl groups, pyranyl groups, dioxanyl groups, 2,3-dihydrobenzo [1,4] dioxinyl groups Two or more kinds of oxygen-containing heterocyclic groups such as benzofuranyl group, oxazolyl group, isoxazolyl group, thiazolyl group, isothiazolyl group, benzoxazolyl group, benzoisoxazolyl group, benzothiazolyl group, benzoisothiazolyl Examples include heterocyclic groups containing a hetero atom.

For heteroarylalkyl group in R ₅ in the general formula (8), heteroaryl moiety has the same meaning as the heteroaryl group for R ₅ in the general formula (8), the alkyl moiety represents the ones having 1 to 4 carbon atoms .
In the compound represented by the general formula (8), X represents a leaving group.

  Regarding the leaving group represented by X in the general formula (8), halogen atoms such as fluorine, chlorine, bromine and iodine, alkoxy groups such as methoxy group and ethoxy group, phenoxy group, 4-nitrophenyl group and the like Acyloxy groups such as aryloxy group, acetyloxy group, benzoyloxy group, alkoxycarbonyloxy groups such as methoxycarbonyloxy group, ethoxycarbonyloxy group, isobutyloxycarbonyloxy group, arylcarbonyloxy groups such as phenylcarbonyloxy group, methylthio Examples thereof include an alkylthio group such as a group, 2,5-dioxopyrrolidinyloxy group, benzotriazolyloxy group and imidazolyl group.

In the compound represented by the general formula (9), R ₁ , R ₂ , R ₃ and R ₄ have the same meaning as described in the general formula (1), and R ₅ is described in the general formula (8). It is synonymous with.

  Although the usage-amount of the compound represented by General formula (8) will not be specifically limited if it is the same equivalent or more as the compound represented by General formula (7), 1 equivalent or more and 3 equivalent or less from an economical viewpoint. Is preferred.

  When the compound represented by the general formula (7) forms a salt with an acid, or when the compound represented by the general formula (7) and the compound represented by the general formula (8) are reacted, If generated, a base can be used.

  Bases used include inorganic bases such as sodium hydroxide, potassium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium carbonate, potassium carbonate, pyridine, collidine, picoline, 4-dimethylaminopyridine, lutidine, triethylamine, diisopropyl. Examples include organic bases such as amine, diisopropylethylamine, tributylamine, 1,8-diazabicyclo [5,4,0] -undec-7-ene, 1,4-diazabicyclo [2,2,0] octane, and imidazole. . It can also be used alone, or two or more types can be mixed in an arbitrary ratio.

  When the compound represented by the general formula (7) forms a salt with an acid, the base can be used in an amount of 1 equivalent or more with respect to the acid. When is generated, 1 equivalent or more can be used with respect to the generated acid. The upper limit is preferably 10 equivalents or less from the economical viewpoint.

  The solvent used when the compound represented by the general formula (7) and the compound represented by the general formula (8) are reacted is not particularly limited as long as the compound represented by the general formula (9) is generated. It will never be done. Specific examples of the solvent include halogen solvents such as dichloromethane and chloroform, aromatic solvents such as benzene, toluene and xylene, hydrocarbon solvents such as hexane and heptane, dimethylformamide, dimethylacetamide and 1-methyl-2-pyrrolidone. Amide solvents such as 1,3-dimethyl-2-imidazolidinone, urea solvents such as 1,3-dimethyl-3,4,5,6-tetrahydro-2 (1H) -piperidinone, ethyl acetate, acetic acid Ester solvents such as butyl and isopropyl acetate, ether solvents such as diethyl ether, diisopropyl ether, 1,2-dimethoxyethane, tetrahydrofuran and dioxane, nitrile solvents such as acetonitrile and propionitrile, isopropanol and t-butyl alcohol List alcoholic solvents and water You can. It can also be used alone, or two or more types can be mixed in an arbitrary ratio.

  Although the usage-amount of a solvent is not specifically limited, Usually, it is 3 times weight or more and 40 times weight or less with respect to the compound represented by General formula (7).

  The reaction temperature at the time of reacting the compound represented by the general formula (7) and the compound represented by the general formula (8) is not particularly limited as long as the compound is set so as not to be decomposed. -10 ° C to 150 ° C or the boiling point of the solvent.

  As described above, it has become possible to efficiently produce a compound represented by the general formula (9), that is, an ethylenediamine derivative having a fluorine-containing carbamate group and an acyl group.

  The present invention will be illustrated in more detail by the following examples, but the present invention is not limited thereto.

Compound purity analysis was performed by HPLC. Separation column: L-Column ODS
φ4.6mm × 250mm (Chemical Substance Evaluation Research Organization)
For separation and analysis of optical isomers, a separation column: CHIRALPAK IA (250 mm ×
4.6 mmI. D. ) Made by Daicel Chemical Industries.

Example 1 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-alanine

A 1000 ml four-necked flask equipped with a stirrer was charged with 50.8 g of L-alanine and 100 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 93.5 g of 2,2,2-trifluoroethyl chloroformate and 200 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The white solid compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 24.5g (Yield 20%)
¹ H NMR (CDCl 3) δ 1.51 (3H, d, J = 7.32 Hz), 4.40-4.53 (3H, m), 5.45 (1H, d, J = 8.79 Hz).
LC-MS M + 1 (216)

Example 2 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-alanino chloride

In a 100 ml four-necked flask equipped with a stirrer, add 10 g of methylene chloride, 1.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-alanine, and 1 drop of N, N-dimethylformamide (hereinafter DMF). The mixture was charged and cooled to 5 ° C., 0.90 g of oxalyl chloride was added dropwise, and the mixture was further stirred for 2 hours while maintaining 5 ° C. After concentration under reduced pressure, 10 g of methylene chloride was added to the resulting oily residue, stirred for 10 min, and concentrated under reduced pressure to obtain an oily substance. The resulting oily compound was the title compound.
Yield 1.08 g (Yield 99.5%)
¹ H NMR (CDCl 3) δ 1.59 (3H, d, J = 7.32 Hz), 4.40-4.65 (3H, m), 5.48 (1H, br).

IR (ATR method) cm ⁻¹ 3330, 1779, 1716, 1525, 1454, 1413, 1383, 1285, 1243, 1162, 1121, 1088, 1049, 985, 897, 839, 774, 739, 637, 554, 524, 415.

Example 3 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-alaninamide

A 500 ml four-necked flask equipped with a stirrer was charged with 100 g of toluene, 19.3 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-alanine and 0.4 g of DMF, and the temperature was raised to 55 ° C. After injecting 30 g of phosgene, the mixture was further stirred for 2 hours while maintaining 55 ° C. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 34 g of an oily residue. A 1000 ml four-necked flask equipped with a stirrer was charged with 200 g of a 10 wt% NH ₃ aqueous solution, cooled to 5 ° C., and the residue was added dropwise while maintaining the temperature at 15 ° C. or lower. After completion of dropping, the mixture was stirred at 10 ° C. for 3 hours, and then the precipitate was filtered and dried under reduced pressure. The resulting white solid compound was the title compound.
Yield 17.5 g (91% yield)

¹ H NMR (DMSO-d6) δ 1.21 (3H, d, J = 7.32Hz), 3.96 (1H, m), 4.62 (2H, m), 6.98 (1H, brs), 7.33 (1h, brs), 7.76 (1H, d, J = 7.81Hz).

Example 4 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-alaninonitrile

To 350 ml of toluene, 31.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-alaninamide and 35 ml of DMF were added and stirred at room temperature, and 35 ml of toluene containing 22.01 g of oxalyl chloride was carefully added dropwise. After stirring at the same temperature for 2 hours, 350 ml of water was added for liquid separation. Further, the separated organic layer was washed with 350 ml of water, and then the solvent was distilled off under reduced pressure. Subsequently, purification was performed by column chromatography. The resulting white solid was the title compound.
Yield 25.83 g (91% yield)

¹ H NMR (CDCl3) δ 1.61 (3H, d, J = 7.32Hz), 4.47 (1H, m), 4.53 (1H, m), 4.67 (1H, m), 5.38 (1h, brd).

Example 5 Synthesis of (2S) -N2- (2,2,2-trifluoroethoxycarbonyl) -propane-1,2-diamine hydrochloride

To 40 ml of isopropyl alcohol (hereinafter referred to as IPA), 6.0 g of acetic acid, 0.5 g of 5% palladium carbon (moisture 49.5%, manufactured by NEC Chem) and 3.2 g of ammonium formate were sequentially added and sufficiently stirred. To this, 8 ml of IPA containing 2.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-alaninonitrile was added dropwise at room temperature, followed by stirring at the same temperature for 2.5 hours. After removing the catalyst by filtration, the solvent was distilled off under reduced pressure, and water and ethyl acetate were added to the residue. Subsequently, potassium carbonate was added and separated until the pH of the aqueous layer was about 10. Sodium sulfate was added to the separated organic layer, dried and filtered, and then a 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
White solid Yield 2.05g (Yield 85%)

¹ H NMR (DMSO-d6) δ1.12 (3H, t, J = 6.83Hz), 2.81 (2H, m), 3.79 (1H, m), 4.60 (1H, m), 4.67 (1H, m), 7.76 (1H, d, J = 8.29Hz), 8.12 (3H, brs).

Example 6 Synthesis of (2S) -N1-toluoyl-N2- (2,2,2-trifluoroethoxycarbonyl) -propane-1,2-diamine

To 7 ml of water containing 0.45 g of sodium bicarbonate, add 5 ml of ethyl acetate and 0.5 g of (2S ) -N2- (2,2,2-trifluoroethoxycarbonyl) -propane-1,2-diamine hydrochloride. The mixture was stirred, and 0.33 g of toluic acid chloride was added dropwise thereto. After stirring at room temperature for 2.5 hours, liquid separation was performed. After adding sodium sulfate to the organic layer, drying and filtering, the solution was concentrated under reduced pressure. Further, 8 ml of isopropyl ether (hereinafter referred to as IPE) was added, and the precipitate was sufficiently washed and collected by filtration. The resulting white solid was the title compound.
White solid Yield 0.56g (84% yield)

¹ H NMR (CDCl 3) δ 1.26 (3H, d, J = 6.83 Hz), 2.39 (3H, s), 3.53 (2H, m), 3.95 (1H, m), 4.41 (2H, m), 5.50 ( 1H, brd, J = 7.32Hz), 6.74 (1H, brs), 7.22 (2H, d, J = 7.81Hz), 7.66 (2H, d, J = 7.81Hz).

Example 7 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucine

A 500 ml four-necked flask equipped with a stirrer was charged with 24.5 g of L-isoleucine and 50 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 31.2 g of 2,2,2-trifluoroethyl chloroformate and 100 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The white solid compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 46g (Yield 96%)

¹ H NMR (CDCl 3) δ 0.95 (3H, t, J = 7.81 Hz), 0.99 (3H, d, J = 6.84 Hz), 1.20-1.30 (1H, m), 1 .42-1.55 (1H, m), 1.92-2.05 (1H, m), 4.37-4.55 (3H, m), 5.42 (1H, d, J = 8. 79Hz).
LC-MS M + 1 (258)

Example 8 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucine chloride

A 200 ml four-necked flask equipped with a stirrer was charged with 10 g of methylene chloride, 1.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucine and 1 drop of DMF, and cooled to 5 ° C. After dropping 0.74 g of oxalyl chloride, the mixture was further stirred for 2 hours while maintaining 5 ° C. The residue was charged with 20 g of n-hexane and cooled to 5 ° C. After stirring for 3 hours, the precipitate was filtered under a nitrogen stream, washed with n-hexane, and dried under reduced pressure at room temperature. The resulting white solid compound was the title compound.
Yield 1.0 g (93% yield)

¹ H NMR (CDCl 3) δ 0.97 (3H, t, J = 7.33 Hz), 1.06 (3H, d, J = 6.84 Hz), 1.15-1.25 (1H, m), 1 .42-1.52 (1H, m), 2.12-2.21 (1H, m), 4.43-4.55 (3H, m), 5.35 (1H, br).

IR (ATR method) cm ⁻¹ 3380, 2974, 2885, 1802, 1720, 1517, 1441, 1402, 1297, 1283, 1227, 1156, 1111, 1047, 990, 966, 943, 924, 841, 830, 792, 760, 660, 643, 594, 530, 511, 435.

Example 9 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucinamide

A 500 ml four-necked flask equipped with a stirrer was charged with 24.5 g of L-isoleucine, 50 g of water and 75 g of toluene, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 31.2 g of 2,2,2-trifluoroethyl chloroformate and 6 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and then the temperature was raised to 60 ° C. for liquid separation. The organic layer was azeotropically dehydrated, transferred to a 500 ml four-necked flask equipped with a stirrer, charged with 0.6 g of DMF, cooled to 50 ° C., blown with 25 g of phosgene, and further maintained at 55 ° C. Stir for 2 hours. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 52 g of an oily residue. A 1000 ml four-necked flask equipped with a stirrer was charged with 310 g of a 10 wt% NH ₃ aqueous solution, cooled to 5 ° C., and the residue was added dropwise while maintaining the temperature at 15 ° C. or lower. After completion of dropping, the mixture was stirred at 10 ° C. for 3 hours, and then the precipitate was filtered and dried under reduced pressure. The resulting white solid compound was the title compound.
Yield 41.2g (86% yield)

¹ H NMR (DMSO-d6) δ 0.82 (6H, m), 1.13 (1H, m), 1.41 (1H, m), 1.71 (1H, m), 3.81 (1H, t, J = 8.29 Hz), 4.64 (2H, q, J = 9.27 Hz), 7.05 (1H, s), 7.39 (1H, s), 7.65 (1H, d, J = 8.29 Hz).

Example 10 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucinonitrile

To 50 ml of toluene, 5.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucinamide and 5 ml of DMF were added and stirred at room temperature, and 5 ml of toluene containing 3.05 g of oxalyl chloride was carefully added dropwise. After stirring at the same temperature for 2 hours, 50 ml of water was added to separate the layers. Further, the separated organic layer was washed with 50 ml of water, and then the solvent was distilled off under reduced pressure. Subsequently, purification was performed by column chromatography. The resulting white solid was the title compound.
Colorless oily substance Yield 4.53 g (97% yield)

¹ H NMR (CDCl3) δ 0.98 (3H, t, J = 7.32Hz), 1.10 (3H, d, J = 6.83Hz), 1.34 (1H, m), 1.59 (1H, m), 1.83 (1H, m), 4.48 (1H, m), 4.53 (1H, m), 4.59 (1H, m), 5.35 (1H, brd).

Example 11 Synthesis of (2S, 3S) -3-methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -pentane-1,2-diamine hydrochloride

To 40 ml of IPA, 6.0 g of acetic acid, 0.5 g of 5% palladium carbon (water content 49.5%, manufactured by NEC Chem) and 3.2 g of ammonium formate were sequentially added and sufficiently stirred. 10 ml of IPA containing 2.5 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucinonitrile was added dropwise thereto at room temperature, followed by stirring at the same temperature for 2.5 hours. After removing the catalyst by filtration, the solvent was distilled off under reduced pressure, and water and ethyl acetate were added to the residue. Subsequently, potassium carbonate was added and separated until the pH of the aqueous layer was about 10. Sodium sulfate was added to the separated organic layer, dried and filtered, and then a 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
Light pink solid Yield 2.56g (92% yield)

¹ H NMR (DMSO-d6) δ 0.84 (6H, m), 1.11 (1H, m), 1.36 (1H, m), 1.53 (1H, m), 2.75 (1H, dd, J = 10.25, 12.69Hz ), 2.92 (1H, dd, J = 2.93, 12.69Hz), 3.60 (1H, m), 4.55 (1H, m), 4.72 (1H, m), 7.73 (1H, d, J = 8.78Hz), 8.10 (3H, brs).

Example 12 Synthesis of (2S, 3S) -3-methyl-N1-toluoyl-N2- (2,2,2-trifluoroethoxycarbonyl) -pentane-1,2-diamine

7 ml of water containing 0.45 g of sodium hydrogen carbonate, 5 ml of ethyl acetate and (2S, 3S) -3-methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -pentane-1,2-diamine hydrochloride 0.5 g was added and stirred, and 0.33 g of toluic acid chloride was added dropwise thereto. After stirring at room temperature for 2.5 hours, liquid separation was performed. After adding sodium sulfate to the organic layer, drying and filtering, the solution was concentrated under reduced pressure. Further, 8 ml of IPE was added and the precipitate was sufficiently washed, and then collected by filtration. The resulting white solid was the title compound.
White solid Yield 0.56g (Yield 87%)

¹ H NMR (CDCl3) δ 0.98 (6H, m), 1.21 (1H, m), 1.59 (1H, m), 2.40 (3H, s), 3.51 (1H, m), 3.68 (1H, m), 3.79 (1H, m), 4.41 (2H, m), 5.30 (1H, brd, J = 7.32Hz), 6.65 (1H, brs), 7.22 (2H, d, J = 7.81Hz), 7.66 (2H, d , J = 7.81Hz).

Example 13 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-leucine

A 500 ml four-necked flask equipped with a stirrer was charged with 25.2 g of L-leucine and 50 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 31.5 g of 2,2,2-trifluoroethyl chloroformate and 100 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The white solid compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 47.4 g (96% yield)

¹ H NMR (CDCl 3) δ 0.97 (6H, d, J = 6.35 Hz), 1.58-1.62 (1H, m), 1.69-1.75 (2H, m), 4.39 -4.54 (3H, m), 5.32 (1H, br).
LC-MS M + 1 (258)

Example 14 Synthesis of synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-leucine chloride

A 100 ml four-necked flask equipped with a stirrer was charged with 10 g of methylene chloride, 1.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucine, and 1 drop of DMF, and cooled to 5 ° C. After dropping 0.74 g of oxalyl chloride, the mixture was further stirred for 2 hours while maintaining 5 ° C. After concentration under reduced pressure, 10 g of methylene chloride was added to the resulting oily residue, stirred for 10 min, and concentrated under reduced pressure to obtain an oily substance. The resulting oily compound was the title compound.
Yield 1.07 g (100% yield)

¹ H NMR (CDCl 3) δ 0.97 (3H, d, J = 6.35 Hz), 1.00 (3H, d, J = 6.35 Hz), 1.60-1.66 (1 H, m), 1 .72-1.88 (2H, m), 4.45-4.60 (3H, m), 5.33 (1H, br).

IR (ATR method) cm ⁻¹ 3326, 2964, 1793, 1716, 1528, 1414, 1371, 1285, 1246, 1163, 1133, 1071, 984, 960, 837, 767, 637, 526.

Example 15 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-leucinamide

A 500 ml four-necked flask equipped with a stirrer was charged with 24.5 g of L-leucine, 50 g of water and 75 g of toluene, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 31.3 g of 2,2,2-trifluoroethyl chloroformate and 6 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and then the temperature was raised to 60 ° C. for liquid separation. After the azeotropic dehydration of the organic layer, the solution was transferred to a 500 ml four-necked flask equipped with a stirrer, charged with 0.7 g of DMF, cooled to 40 ° C., blown with 30 g of phosgene, and further maintained at 40 ° C. Stir for 2 hours. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 54 g of an oily residue. A 1000 ml four-necked flask equipped with a stirrer was charged with 310 g of a 10 wt% NH ₃ aqueous solution, cooled to 5 ° C., and the residue was added dropwise while maintaining the temperature at 15 ° C. or lower. After completion of dropping, the mixture was stirred at 10 ° C. for 3 hours, and then the precipitate was filtered and dried under reduced pressure. The resulting white solid compound was the title compound.
Yield 41.2g (86% yield)

¹ H NMR (DMSO-d6) δ 0.85 (3H, d, J = 6.34 Hz), 0.87 (3H, d, J = 6.83 Hz), 1.47 (2H, m), 1.59 (1H, m), 3.96 (1H, m), 4.69 (2H, m), 6.98 (1H, s), 7.36 (1H, s), 7.74 (1H, d, J = 8.29 Hz).

Example 16 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-leucinonitrile

To 50 ml of toluene, 5.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-leucinamide and 5 ml of DMF were added and stirred at room temperature, and 5 ml of toluene containing 3.05 g of oxalyl chloride was carefully added dropwise. After stirring at the same temperature for 2 hours, 50 ml of water was added to separate the layers. Further, the separated organic layer was washed with 50 ml of water, and then the solvent was distilled off under reduced pressure. Subsequently, purification was performed by column chromatography. The resulting white solid was the title compound.
Yellow oily substance Yield 4.41 g (95% yield)

¹ H NMR (CDCl3) δ0.99 (6H, d, J = 6.34Hz), 1.70-1.90 (3H, m), 4.47 (1H, m), 4.53 (1H, m), 4.62 (1H, m), 5.31 (1H, brd).

Example 17 Synthesis of (2S) -4-methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -pentane-1,2-diamine hydrochloride

To 40 ml of IPA, 6.0 g of acetic acid, 0.5 g of 5% palladium carbon (water content 49.5%, manufactured by NEC Chem) and 3.2 g of ammonium formate were sequentially added and sufficiently stirred. 10 ml of IPA containing 2.5 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-isoleucinonitrile was added dropwise thereto at room temperature, followed by stirring at the same temperature for 2.5 hours. After removing the catalyst by filtration, the solvent was distilled off under reduced pressure, and water and ethyl acetate were added to the residue. Subsequently, potassium carbonate was added and separated until the pH of the aqueous layer was about 10. Sodium sulfate was added to the separated organic layer, dried and filtered, and then a 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
Pale pink solid Yield 2.32 g (79% yield)

¹ H NMR (DMSO-d6) δ 0.86 (3H, d, J = 6.34Hz), 0.88 (3H, d, J = 6.34Hz), 1.27 (1H, m), 1.36 (1H, m), 1.56 ( 1H, m), 2.73 (1H, dd, J = 8.78,12.69Hz), 2.82 (1H, dd, J = 4.39,12.69Hz), 3.76 (1H, m), 4.57 (1H, m), 4.69 (1H , m), 7.67 (1H, d, J = 8.78Hz), 8.06 (3H, brs).

Example 18 Synthesis of (2S) -4-methyl-N1-toluoyl-N2- (2,2,2-trifluoroethoxycarbonyl) -pentane-1,2-diamine

To 7 ml of water containing 0.45 g of sodium bicarbonate, 5 ml of ethyl acetate and (2S) -4-methyl-N 2-(2,2,2-trifluoroethoxycarbonyl) -pentane-1,2-diamine hydrochloride 5 g was added and stirred, and 0.33 g of toluic acid chloride was added dropwise thereto. After stirring at room temperature for 2.5 hours, liquid separation was performed. After adding sodium sulfate to the organic layer, drying and filtering, the solution was concentrated under reduced pressure. Further, 8 ml of IPE was added and the precipitate was sufficiently washed, and then collected by filtration. The resulting white solid was the title compound.
White solid Yield 0.56g (Yield 87%)

¹ H NMR (CDCl 3) δ 0.94 (3H, d, J = 6.34 Hz), 0.95 (3H, d, J = 6.34 Hz), 1.38 (1H, m), 1.43 (1H, m), 1.70 (1H, s), 2.39 (3H, s), 3.49 (1H, m), 3.53 (1H, m), 3.92 (1H, m), 4.41 (2H, m), 5.19 (1H, d, J = 8.78Hz), 6.71 (1H, brs), 7.22 (2H, d, J = 7.81Hz), 7.65 (2H, d, J = 7.81Hz).

Example 19 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalanine

A 500 ml four-necked flask equipped with a stirrer was charged with 25.6 g of L-phenylalanine and 40 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or less, a mixed solution of 25.4 g of 2,2,2-trifluoroethyl chloroformate and 200 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The white solid compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 43.3 g (96% yield)

¹ H NMR (CDCl 3) δ 3.11-3.16 (1H, m), 3.21-3.26 (1H, m), 4.40-4.52 (2H, m), 4.66-4 .72 (1H, m), 5.36 (1H, d, J = 8.30 Hz), 7.17 (2H, d, J = 6.35 Hz), 7.29-7.33 (3H, m) .
LC-MS M + 1 (292)

Example 20: Synthesis of synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalanino chloride

A 200 ml four-necked flask equipped with a stirrer was charged with 10 g of methylene chloride, 1.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalanine and 1 drop of DMF, and cooled to 5 ° C. After 0.70 g of oxalyl chloride was dropped, the mixture was further stirred for 2 hours while maintaining 5 ° C. The residue was charged with 100 g of n-hexane and cooled to 5 ° C. After stirring for 3 hours, the precipitate was filtered under a nitrogen stream, washed with n-hexane, and dried under reduced pressure at room temperature. The resulting white solid compound was the title compound.
Yield 1.0g (94% yield)

¹ H NMR (CDCl 3) δ 3.28 (2H, d, J = 5.86 Hz), 4.35-4.55 (2H, m), 4.85-4.90 (1H, m), 5.32 (1H, br), 7.16-7.20 (2H, m), 7.31-7.36 (3H, m).

IR (ATR method) cm ^-1 3309, 3064, 3034, 2979, 2938, 1782, 1714, 1536, 1495, 1455, 1421, 1304, 1278, 1250, 1164, 1068, 1036, 958, 938, 881, 857, 768, 718, 661, 628, 565, 536, 524, 494.

Example 21 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalaninamide

A 500 ml four-necked flask equipped with a stirrer was charged with 16.5 g of L-phenylalanine, 35 g of water and 75 g of toluene, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 17 g of 2,2,2-trifluoroethyl chloroformate and 6 g of toluene was added dropwise, and further maintained for 1 hour while maintaining the pH at 12 ± 0.5. Stir. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and then the temperature was raised to 60 ° C. for liquid separation. The organic layer was azeotropically dehydrated, transferred to a 500 ml four-necked flask equipped with a stirrer, charged with 0.4 g of DMF, cooled to 40 ° C., blown with 30 g of phosgene, and further maintained at 40 ° C. Stir for 2 hours. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 34 g of an oily residue. A 1000 ml four-necked flask equipped with a stirrer was charged with 200 g of a 10 wt% NH ₃ aqueous solution, cooled to 5 ° C., and the residue was added dropwise while maintaining the temperature at 15 ° C. or lower. After completion of dropping, the mixture was stirred at 10 ° C. for 3 hours, and then the precipitate was filtered and dried under reduced pressure. The resulting white solid compound was the title compound.
Yield 24.9 g (86% yield)

¹ H NMR (DMSO-d6) δ 2.75 (1H, m), 2.99 (1H, m), 4.15 (1H, m), 4.57 (2H, m), 7.09 (1H, brs), 7.20 (1H, m), 7.24 (1H, m), 7.27 (3H, m), 7.51 (1H, brs), 7.85 (1H, d, J = 8 19Hz).

Example 22 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalaninonitrile

To 50 ml of toluene, 5.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalaninamide and 5 ml of DMF were added and stirred at room temperature, and 5 ml of toluene containing 3.05 g of oxalyl chloride was carefully added dropwise. After stirring at the same temperature for 2 hours, 50 ml of water was added to separate the layers. Further, the separated organic layer was washed with 50 ml of water, and then the solvent was distilled off under reduced pressure. Subsequently, purification was performed by column chromatography. The resulting white solid was the title compound.
White solid Yield 3.97 g (85% yield)

¹ H NMR (CDCl3) δ 3.13 (2H, m), 4.49 (2H, m), 4.86 (1H, m), 5.29 (1H, brd), 7.28 (2H, m), 7.37 (3H, m).

Example 23 Synthesis of (2S) -N2- (2,2,2-trifluoroethoxycarbonyl) -3-phenyl-propane-1,2-diamine hydrochloride

To 40 ml of IPA, 6.0 g of acetic acid, 0.5 g of 5% palladium carbon (water content 49.5%, manufactured by NEC Chem) and 3.2 g of ammonium formate were sequentially added and sufficiently stirred. 10 ml of IPA containing 2.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-phenylalaninonitrile was added dropwise thereto at room temperature, followed by stirring at the same temperature for 2.5 hours. After removing the catalyst by filtration, the solvent was distilled off under reduced pressure, and water and ethyl acetate were added to the residue. Subsequently, potassium carbonate was added and separated until the pH of the aqueous layer was about 10. Sodium sulfate was added to the separated organic layer, dried and filtered, and then a 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
White solid Yield 2.04g (88% yield)

¹ H NMR (DMSO-d6) δ 2.72 (1H, m), 2.85 (3H, m), 3.91 (1H, m), 4.56 (2H, m), 7.21 (3H, m), 7.30 (2H, m ), 7.80 (1H, d, J = 8.78Hz), 8.09 (3H, brs).

Example 24 Synthesis of (2S) -N1-Toluoyl-N2- (2,2,2-trifluoroethoxycarbonyl) -3-phenyl-propane-1,2-diamine

7 ml of water containing 0.45 g of sodium hydrogencarbonate, 5 ml of ethyl acetate and (2S) -N2- (2,2,2-trifluoroethoxycarbonyl) -3-phenyl-propane-1,2-diamine hydrochloride 3 g was added and stirred, and toluic acid chloride 0.18 was added dropwise thereto. After stirring at room temperature for 2.5 hours, liquid separation was performed. After adding sodium sulfate to the organic layer, drying and filtering, the solution was concentrated under reduced pressure. Further, 8 ml of IPE was added and the precipitate was sufficiently washed, and then collected by filtration. The resulting white solid was the title compound.
White solid Yield 0.35g (93% yield)

¹ H NMR (CDCl 3) δ 2.39 (3H, s), 2.83 (1H, dd, J = 7.81, 14.15Hz), 3.00 (1H, dd, J = 6.83, 14.15Hz), 3.53 (1H, m), 3.59 (1H, m), 4.11 (1H, m), 4.40 (2H, m), 5.63 (1H, d, J = 7.81Hz), 6.52 (1H, brs), 7.24 (5H, m), 7.33 (2H , m), 7.62 (2H, d, J = 7.81Hz).

Example 25 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-proline

A 500 ml four-necked flask equipped with a stirrer was charged with 25.4 g of L-proline and 50 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or less, a mixed solution of 2,6.2-trifluoroethyl chloroformate and 100 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The oily compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 51.1 g (96% yield)

¹ H NMR (CDCl3) δ 1.92-2.03 (2H, m), 2.12-2.16 (1H, m), 2.23-2.38 (1H, m), 3.48-3 .57 (1H, m), 3.59-3.67 (1H, m), 4.38-4.49 (2H, m), 4.51-4.61 (1H, m).
LC-MS M + 1 (242)

Example 26 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-prolinochloride

A 200 ml four-necked flask equipped with a stirrer was charged with 10 g of methylene chloride, 1.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-proline and 1 drop of DMF, and cooled to 5 ° C. After 0.70 g of oxalyl chloride was dropped, the mixture was further stirred for 2 hours while maintaining 5 ° C. After concentration under reduced pressure, 10 g of methylene chloride was added to the resulting oily residue, stirred for 10 min, and concentrated under reduced pressure to obtain an oily substance. The resulting oily compound was the title compound.
Yield 1.07 g (99% yield)

¹ H NMR (CDCl 3) δ 1.95-2.07 (2H, m), 2.22-2.45 (2H, m), 3.50-3.70 (2H, m), 4.40-4 .60 (2H, m), 4.65-4.70 (1H, m).

IR (ATR method) cm ^-1 2979, 1787, 1720, 1421, 1385, 1276, 1160, 1124, 969, 874, 838, 761, 702, 648, 595, 531, 442.

Example 27 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-prolinamide

A 500 ml four-necked flask equipped with a stirrer was charged with 11.5 g of L-proline, 30 g of water and 60 g of toluene, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 17 g of 2,2,2-trifluoroethyl chloroformate and 6 g of toluene was added dropwise, and further maintained for 1 hour while maintaining the pH at 12 ± 0.5. Stir. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and then the temperature was raised to 60 ° C. for liquid separation. The organic layer was azeotropically dehydrated, transferred to a 500 ml four-necked flask equipped with a stirrer, charged with 0.4 g of DMF, cooled to 40 ° C., blown with 30 g of phosgene, and further maintained at 40 ° C. Stir for 2 hours. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 29 g of an oily residue. A 1000 ml four-necked flask equipped with a stirrer was charged with 200 g of a 10 wt% NH ₃ aqueous solution, cooled to 5 ° C., and the residue was added dropwise while maintaining the temperature at 15 ° C. or lower. After completion of dropping, the mixture was stirred at 10 ° C. for 3 hours, and then the precipitate was filtered and dried under reduced pressure. The resulting white solid compound was the title compound.
Yield 20.6 g (86% yield)

¹ H NMR (DMSO-d6) δ1.82 (3H, m), 2.16 (1H, m), 3.38 (1H, m), 3.46 (1H, m), 4.13 (1H, m), 4.6-4.7 (2H , m), 6.99 (1H, s), 7.41 (1H, s).

Example 28 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-prolinonitrile

To 50 ml of toluene, 5.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-prolinamide and 5 ml of DMF were added and stirred at room temperature, and 5 ml of toluene containing 3.05 g of oxalyl chloride was carefully added dropwise. After stirring at the same temperature for 2 hours, 50 ml of water was added to separate the layers. Further, the separated organic layer was washed with 50 ml of water, and then the solvent was distilled off under reduced pressure. Subsequently, purification was performed by column chromatography. The resulting white solid was the title compound.
Yellow transparent oily substance Yield 4.13 g (89% yield)

¹ H NMR (CDCl3) δ 2.1-2.3 (4H, m), 3.46 (1H, m), 3.63 (1H, m), 4.49 (1H, m), 4.61 (2H, m).

Example 29 Synthesis of (2S) -N- (2,2,2-trifluoroethoxycarbonyl) -2- (aminomethyl) -pyrrolidine hydrochloride

To 40 ml of IPA, 6.0 g of acetic acid, 0.5 g of 5% palladium carbon (water content 49.5%, manufactured by NEC Chem) and 3.2 g of ammonium formate were sequentially added and sufficiently stirred. To this, 10 ml of IPA containing 2.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-prolinonitrile was added dropwise at room temperature, followed by stirring at the same temperature for 2.5 hours. After removing the catalyst by filtration, the solvent was distilled off under reduced pressure, and water and ethyl acetate were added to the residue. Subsequently, potassium carbonate was added and separated until the pH of the aqueous layer was about 10. Sodium sulfate was added to the separated organic layer, dried and filtered, and then a 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
White solid Yield 1.67 g (Yield 71%)

¹ H NMR (DMSO-d6) δ1.8-2.0 (4H, m), 2.86 (1H, m), 2.96 (1H, m), 3.38 (2H, m), 4.03 (1H, m), 4.69 (2H , m), 8.19 (3H, brs).

Example 30 Synthesis of (2S) -N- (2,2,2-trifluoroethoxycarbonyl) -2- (N-toluoyl-aminomethyl) -pyrrolidine

To 7 ml of water containing 0.45 g of sodium bicarbonate, 5 ml of ethyl acetate and 0.5 g of ((2S) -N- (2,2,2-trifluoroethoxycarbonyl) -2- (aminomethyl) -pyrrolidine hydrochloride were added. Then, 0.33 g of toluic acid chloride was added dropwise to the mixture, and the mixture was stirred at room temperature for 2.5 hours, followed by liquid separation, sodium sulfate was added to the organic layer, dried and filtered, and then the solution was removed under reduced pressure. Further, 8 ml of IPE was added, and the precipitate was washed thoroughly and collected by filtration, and the resulting white solid was the title compound.
White solid Yield 0.50g (Yield 80%)

¹ H NMR (CDCl3) δ1.8-2.2 (4H, m), 2.39 (3H, s), 3.4-3.5 (3H, s), 3.68 (1H, m), 4.19 (1H, m), 4.52 (2H , m), 7.23 (2H, d, J = 8.29Hz), 7.72 (2H, d, J = 8.29Hz), 7.79 (1H, brs).

Example 31 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valine

A 1000 ml four-necked flask equipped with a stirrer was charged with 100 g of L-valine and 150 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or less, a mixed solution of 140 g of 2,2,2-trifluoroethyl chloroformate and 400 g of toluene was added dropwise, and further maintained for 1 hour while maintaining the pH at pH 12 ± 0.5. Stir. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The white solid compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 203.4 g (98% yield)

¹ H NMR (CDCl3) δ 0.96 (3H, d, J = 6.84 Hz), 1.03 (3H, d, J = 6.84 Hz), 2.20-2.30 (1H, m), 4.35 (1H, dd, J = 6.84, 8.79 Hz), 4.42-4.55 (2H, m), 5.41 (1H, d, J = 8.79 Hz).
LC-MS M + 1 (244)

Example 32 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valyl chloride

In a 200 ml four-necked flask equipped with a stirrer, 20.4 g of toluene, 13.6 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-valine, N, N-dimethylformamide (hereinafter DMF) 0. 17 g was charged, the temperature was raised to 40 ° C., 9.4 g of phosgene was blown in, and the mixture was further stirred for 2 hours while maintaining 40 ° C. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 16 g of an oily residue. A 300 ml four-necked flask equipped with a stirrer was charged with 50 g of n-hexane, and the oily residue was slowly added, followed by cooling to 5 ° C. After stirring for 3 hours, the precipitate was filtered under a nitrogen stream, washed with n-hexane, and dried under reduced pressure at room temperature. The resulting white solid compound was the title compound.
Yield 13.6 g (93% yield)

¹ H NMR (CDCl3) δ 0.97 (3H, d, J = 6.6 Hz), 1.08 (3H, d, J = 7.3 Hz), 2.45-2.49 (1H, m), 4 .43-4.57 (3H, m), 5.36 (1H, br).

IR (ATR method) cm ⁻¹ 3330,2974,1797,1717,1519,1468,1413,1283,1231,1162,1116, 1036,980,961,927,838,797,768,639,549,493, 450.

Example 33 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valine amide

A 1000 ml four-necked flask equipped with a stirrer was charged with 407 g of toluene, 196 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-valine and 5.9 g of N, N-dimethylformamide (hereinafter DMF). The temperature was raised to 55 ° C., 95.8 g of phosgene was blown in, and the mixture was further stirred for 2 hours while maintaining 55 ° C. N ₂ was blown to drive off excess phosgene, followed by concentration under reduced pressure to obtain 223 g of an oily residue. A 2000 ml four-necked flask equipped with a stirrer was charged with 1390 g of a 10 wt% NH ₃ aqueous solution, cooled to 5 ° C., and the residue was added dropwise while maintaining the temperature at 15 ° C. or lower. After completion of dropping, the mixture was stirred at 10 ° C. for 3 hours, and then the precipitate was filtered and dried under reduced pressure. The resulting white solid compound was the title compound. As a result of HPLC analysis using a chiral column, D-form was not detected (detection limit 0.02%).
Yield 177.8g (91% yield)

¹ H NMR (DMSO-d6) δ 0.84 (3H, d, J = 6.83 Hz), 0.86 (3H, d, J = 6.83 Hz), 1.98 (1H, m), 3.78 (1H, dd, J = 6.83) , 8.78Hz), 4.64 (2H, m), 7.05 (1H, brs), 7.37 (1H, brs), 7.61 (1H, d, J = 8.78Hz).

Example 34 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valine amide

A 200 ml four-necked flask equipped with a stirrer was charged with 18 g of L-valine, 22 g of water and 52 g of toluene, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or less, a mixed solution of 25.7 g of 2,2,2-trifluoroethyl chloroformate and 6.4 g of toluene was added dropwise, and the pH was adjusted to pH 12 ± 0.5. While maintaining, the mixture was stirred for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and then the temperature was raised to 60 ° C. for liquid separation. The organic layer was azeotropically dehydrated, transferred to a 200 ml four-necked flask equipped with a stirrer, charged with 0.5 g of DMF, cooled to 40 ° C., blown with 23.5 g of phosgene, and kept at 40 ° C. The mixture was further stirred for 2 hours. N ₂ was blown to expel excess phosgene. A 200 ml four-necked flask equipped with a stirrer was charged with 67.6 g of DMF and cooled to 5 ° C., and then the reaction solution was charged dropwise. While maintaining at 15 ° C. or lower, 6.3 g of NH ₃ gas was blown in, and further stirred for 1 hour while maintaining 15 ° C. or lower. After excess NH ₃ was removed under reduced pressure, water and acetonitrile were added to obtain a homogeneous solution, which was analyzed by HPLC. As a result, 36.1 g (yield 97%) of the title compound was obtained.

Example 35 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valinonitrile

To 350 ml of toluene, 35.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-valineamide and 35 ml of DMF were added and stirred at room temperature, and 35 ml of toluene containing 22.01 g of oxalyl chloride was carefully added dropwise. After stirring at the same temperature for 2 hours, 350 ml of water was added for liquid separation. Further, the separated organic layer was washed with 350 ml of water, and then the solvent was distilled off under reduced pressure. Subsequently, a fraction at 116-122 ° C. at 0.3 mmHg was fractionated by distillation. The resulting colorless and transparent oily substance was the title compound.
Yield 29.89 g (92% yield)

¹ H NMR (CDCl 3) δ 1.10 (3H, d, J = 6.83 Hz), 1.12 (3 H, d, J = 6.83 Hz), 2.09 (1 H, sept, J = 6.83 Hz), 4.4-4.6 (3 H, m), 5.31 (1H, brd).

Example 36 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valinonitrile by a method in which a Vilsmeier reagent was previously prepared

To 5 ml of toluene containing 1 ml of DMF, a 5 ml solution of toluene containing 433 μl of oxalyl chloride was added dropwise at room temperature. After stirring for 30 minutes, 1.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-valine amide was charged and reacted for 3 hours. After washing the organic layer with water, purification by silica gel chromatography gave N- (2,2,2-trifluoroethoxycarbonyl) -L-valinonitrile.
Yield 0.92g (Yield> 99%)

Example 37 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -L-valinonitrile by a method in which a Vilsmeier reagent was previously prepared using phosgene

In 50 ml of toluene containing 5.9 ml of DMF, 6.7 g of phosgene was blown at 5 ° C. After stirring for 30 minutes, 7.4 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-valineamide was charged and reacted for 3 hours. After washing the organic layer with water, purification by silica gel chromatography gave N- (2,2,2-trifluoroethoxycarbonyl) -L-valinonitrile.
Yield 6.80 g (Yield> 99%)

Example 38 Synthesis of (2S) -3-methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -butane-1,2-diamine hydrochloride

To 180 ml of IPA, 26.8 g of acetic acid, 2.0 g of 5% palladium carbon (moisture 49.5%, manufactured by NEChem) and 14.1 g of ammonium formate were sequentially added and sufficiently stirred. To this was added dropwise 10 ml of IPA containing 10.0 g of N- (2,2,2-trifluoroethoxycarbonyl) -L-valinonitrile at room temperature, followed by stirring at the same temperature for 2.5 hours. After removing the catalyst by filtration, the solvent was distilled off under reduced pressure, and water and ethyl acetate were added to the residue. Subsequently, potassium carbonate was added and separated until the pH of the aqueous layer was about 10. Sodium sulfate was added to the separated organic layer, dried and filtered, and then a 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
White solid Yield 10.5g (Yield 89%)

¹ H NMR (DMSO-d6) δ 0.83 (3H, d, J = 6.83 Hz), 0.85 (3 H, d, J = 6.83 Hz), 1.77 (1 H, sept, J = 6.83 Hz), 2.74 (1 H, dd, J = 9.76,13.17Hz), 2.93 (1H, dd, J = 3.42,13.17Hz), 3.54 (1H, m), 4.55 (1H, m), 4.73 (1H, m), 7.67 (1H, d , J = 9.27Hz), 8.02 (3H, brs).

(Example 39) (2S) -3-Methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -butane-1,2-diamine hydrochloride in a method of feeding a raw material using an autoclave Composition

In an autoclave, 50 ml of IPA containing 47.8 g of acetic acid and 4.0 g of 5% palladium carbon (water content 49.5%, manufactured by NEC Chem) was adjusted to 0.95 MPa with hydrogen gas, and then N- (2,2,2-trifluoroethoxy). 111 ml of IPA containing 19.8 g of carbonyl) -L-valinonitrile was fed at 20 ° C. over 6 hours. After the feed was completed, the mixture was stirred for 30 minutes, and then the catalyst was removed and concentration was performed under reduced pressure. At this point, when the free form of the title compound was quantified by high performance liquid chromatography, the reaction yield was 99%. Water and acetic acid were added to the residue, and the aqueous layer was adjusted to pH 10.7 with an 8 wt% aqueous sodium hydroxide solution, followed by liquid separation. The organic layer was dried over sodium sulfate and filtered, and then 20 ml of 4N hydrogen chloride-ethyl acetate solution was added. Concentration under reduced pressure gave a white solid which was collected by filtration to give the title compound.
Yield 22.2 g (95%)

Example 40 Synthesis of (2S) -3-methyl-N1-toluoyl-N2- (2,2,2-trifluoroethoxycarbonyl) -butane-1,2-diamine (Part 1)

1. In 25 ml of water containing 1.91 g of sodium bicarbonate, 20 ml of ethyl acetate and (2S) -3-methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -butane-1,2-diamine hydrochloride 0 g was added and stirred, and 1.40 g of toluic acid chloride was added dropwise thereto. After stirring at room temperature for 2.5 hours, liquid separation was performed. After adding sodium sulfate to the organic layer, drying and filtering, the filtrate was concentrated under reduced pressure. Further, 30 ml of IPE was added and the precipitate was sufficiently washed, and then collected by filtration. The resulting white solid was the title compound.
Yield 2.33 g (89% yield)

¹ H NMR (CDCl3) δ 0.96-1.03 (6H, m), 1.85-1.91 (1H, m), 2.39 (3H, s), 3.46-3.51 (1H, m), 3.61-3.72 (2H, m) , 4.35-4.46 (2H, m), 5.26 (1H, d, J = 8.30Hz), 6.62 (1H, brs), 7.21-7.23 (2H, m), 7.63-7.65 (2H, m).

Example 41 Synthesis of (2S) -3-methyl-N1-toluoyl-N2- (2,2,2-trifluoroethoxycarbonyl) -butane-1,2-diamine (Part 2)

After adding 2.0 g of (2S) -3-methyl-N2- (2,2,2-trifluoroethoxycarbonyl) -butane-1,2-diamine hydrochloride to a mixed solution of 20 ml of ethyl acetate and 30 ml of water, The pH was adjusted to 8 with 8 wt% sodium hydroxide solution. Subsequently, an ethyl acetate solution containing 1.4 g of toluic acid chloride and an 8 wt% sodium hydroxide solution were added dropwise while maintaining the pH at 7.5 to 8.5. After completion of the reaction, the solution was separated and the organic layer was dried over sodium sulfate. After removing sodium sulfate, the solvent was distilled off under reduced pressure, then IPE was added and the precipitate was collected by filtration. The resulting white solid was the title compound.
Yield 2.19 g (84% yield)

Example 42 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -D-valine

A 1000 ml four-necked flask equipped with a stirrer was charged with 50.7 g of D-valine and 76 g of water, cooled to 5 ° C., and adjusted to pH 12 with 32 wt% NaOH. While maintaining pH 12 ± 0.5 and 10 ° C. or lower, a mixed solution of 72.5 g of chloroformic acid 2,2,2-trifluoroethyl and 222 g of toluene was added dropwise, and further the pH was maintained at pH 12 ± 0.5. Stir for 1 hour. Hydrochloric acid was added dropwise to adjust the pH to 1.5, and the mixture was heated to 60 ° C. for liquid separation. The white solid compound obtained by concentrating the organic layer under reduced pressure was the title compound.
Yield 102.4 g (Yield 97.3%)

¹ H NMR (CDCl 3) δ 0.96 (3H, d, J = 6.84 Hz), 1.03 (3H, d, J = 6.84 Hz), 2.20-2.30 (1 H, m), 4.35 (1 H , dd, J = 6.84, 8.79Hz), 4.42-4.55 (2H, m), 5.40 (1H, d, J = 8.79Hz).

Example 43 Synthesis of N- (2,2,2-trifluoroethoxycarbonyl) -D-valine amide

A 500 ml four-necked flask equipped with a stirrer was charged with 181 g of toluene, 86.6 g of N- (2,2,2-trifluoroethoxycarbonyl) -D-valine, and 1.3 g of DMF, and the temperature was raised to 50 ° C. After injecting 58.5 g of phosgene, the mixture was further stirred for 2 hours while maintaining 50 ° C. N ₂ was blown to expel excess phosgene. A 2000 ml four-necked flask equipped with a stirrer was charged with 161 g of DMF and cooled to 5 ° C., and then the reaction solution was charged dropwise. While maintaining at 15 ° C. or lower, 15.2 g of NH ₃ gas was blown in, and further stirred for 1 hour while maintaining 15 ° C. or lower. After removing excess NH ₃ under reduced pressure, water and acetonitrile were added to obtain a homogeneous solution, which was analyzed by HPLC. As a result, 78.5 g (yield 91%) of the title compound was obtained. As a result of HPLC analysis using a chiral column, L-form was not detected (detection limit 0.02%).

¹ H NMR (DMSO-d6) δ 0.83 (3H, d, J = 6.84Hz), 0.85 (3H, d, J = 6.84Hz), 1.92-1.97 (1H, m), 3.77 (1H, dd, J = 6.84, 8.79Hz), 4.64 (2H, m), 7.04 (1H, brs), 7.37 (1H, brs), 7.59 (1H, d, J = 8.79Hz).

Claims (11)

General formula (1)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl Represents a group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ are carbon atoms A pyrrolidine ring structure bonded with a numerator of 3 may be formed.) The compound represented by formula (2) is reacted with ammonia.

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above). In the general formula (1), R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, and R ₂ represents hydrogen or a C 1-6 alkyl group. , R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group; R ₃ and the either the R ₂ of R ₄ may form a pyrrolidine ring structure bonded with a carbon atom number of 3, the manufacturing method according to claim 1. General formula (3)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl Represents a group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ are carbon atoms A pyrrolidine ring structure bonded with a numerator of 3 may be formed.) By reacting a compound represented by general formula (1) with a chlorinating agent.

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with ammonia to give a compound of the general formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above). In the general formula (3), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl group having 1 to 6 carbon atoms. , R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group; R ₃ and the either the R ₂ of R ₄ may form a pyrrolidine ring structure bonded with a carbon atom number of 3, method according to claim 3. General formula (4)

(Wherein R ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; R ₃ And R ₄ are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, substituted or unsubstituted Represents an unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ have 3 carbon atoms And a compound represented by the general formula (5):

(In the formula, R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, or a cycloalkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom.) Is reacted with a fluorine-substituted alkyl chloroformate represented by the general formula (3)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with a chlorinating agent to give a general formula (1)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with ammonia to give a compound of the general formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above). In the general formula (3), R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, and R ₂ represents hydrogen or an alkyl group having 1 to 6 carbon atoms. , R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group; R ₃ and the either the R ₂ of R ₄ may form a pyrrolidine ring structure bonded with a carbon atom number of 3, the manufacturing method according to claim 5. General formula (1)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl Represents a group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ are carbon atoms A pyrrolidine ring structure bonded with 3 children may be formed.) In the general formula (1), R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, and R ₂ represents hydrogen or a C 1-6 alkyl group. , R ₃ and R ₄ each independently represent hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylalkyl group; R ₃ and the either the R ₂ of R ₄ may form a pyrrolidine ring structure bonded with a carbon atom number of 3 a compound according to claim 7. General formula (1)

(Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl Represents a group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ are carbon atoms A pyrrolidine ring structure bonded with a numerator of 3 may be formed.) The compound represented by formula (2) is reacted with ammonia.

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (2) is reacted with an oxygen scavenger to obtain the general formula (6).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Subsequently, the compound represented by the general formula (6) is subjected to a catalytic hydrogenation reaction in the presence of an acid to obtain the general formula (7).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (7) is converted into the general formula (8).

Wherein R ₅ represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, An alkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group).

(Wherein R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are as described above). General formula (3)

( Wherein R ₁ represents a C 1-6 alkyl group substituted with at least one fluorine atom, or a C 3-6 cycloalkyl group substituted with at least one fluorine atom; ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and R ₃ and R ₄ are respectively Independently, hydrogen, substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, substituted or unsubstituted aryl group, substituted or unsubstituted arylalkyl Represents a group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ are carbon atoms A pyrrolidine ring structure bonded with a numerator of 3 may be formed.) By reacting a compound represented by general formula (1) with a chlorinating agent.

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then the compound represented by the general formula (1) is reacted with ammonia in general. Formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (2) is reacted with an oxygen scavenger to obtain the general formula (6).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Subsequently, the compound represented by the general formula (6) is subjected to a catalytic hydrogenation reaction in the presence of an acid to obtain the general formula (7).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (7) is converted into the general formula (8).

Wherein R ₅ represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, An alkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group).

(Wherein R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are as described above). General formula (4)

(Wherein R ₂ represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; R ₃ And R ₄ are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, substituted or unsubstituted Represents an unsubstituted arylalkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and either R ₃ or R ₄ and R ₂ have 3 carbon atoms And a compound represented by the general formula (5):

(In the formula, R ₁ represents an alkyl group having 1 to 6 carbon atoms substituted with at least one fluorine atom, or a cycloalkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom.) Is reacted with a fluorine-substituted alkyl chloroformate represented by the general formula (3)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then reacted with a chlorinating agent to give a general formula (1)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above), and then the compound represented by the general formula (1) is reacted with ammonia in general. Formula (2)

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (2) is reacted with an oxygen scavenger to obtain the general formula (6).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Subsequently, the compound represented by the general formula (6) is subjected to a catalytic hydrogenation reaction in the presence of an acid to obtain the general formula (7).

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are as described above),
Next, the compound represented by the general formula (7) is converted into the general formula (8).

Wherein R ₅ represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryl group, An alkyl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted heteroarylalkyl group, and X represents a leaving group).

(Wherein R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are as described above).