Method for producing α-amino acid including phosphorus and production intermediates thereof
View Patent ↗A method for efficiently producing L-2-amino-4-(hydroxymethylphosphinyl)-butanoic acid, useful as a herbicide, by a catalytic asymmetric synthesis reaction with a high asymmetric yield. The method includes a step in which a compound represented by the below formula (1) and a benzylamine are reacted in the presence of dehydrating agent, then the resulting mass is reacted with hydrogen cyanide in the presence of an asymmetric catalyst, followed by acid hydrolysis, further followed by elimination of a protective group. [chemical formula 1] (1) (where, R 1 represents a C 1-4 alkyl group).
1. A method for producing a compound represented by the following formula (4), wherein a compound represented by the following formula (3) is reacted with hydrogen cyanide under the presence of an asymmetric catalyst:
[In the formula, R 1 represents C 1-4 alkyl group, allyl group, C 1-4 alkyloxy C 1-4 alkyl group, C 1-4 alkyloxy C 1-4 alkyloxy C 1-4 alkyl group, aryl group, substituted aryl group, arylmethyl group, substituted arylmethyl group, tri C 1-4 alkylsilyl group or diphenylmethylsilyl group; R 2 represents allyl group, aryl group, substituted aryl group, arylmethyl group or substituted arylmethyl group];
[In the formula, R 1 and R 2 represent the same meaning as aforementioned].
2. A method for producing a compound represented by the following formula (3), wherein a compound represented by the following formula (1) and a compound represented by the following formula (2) are reacted under the presence of dehydrating agent:
[In the formula, R 1 represents C 1-4 alkyl group, allyl group, C 1-4 alkyloxy C 1-4 alkyl group, C 1-4 alkyloxy C 1-4 alkyloxy C 1-4 alkyl group, aryl group, substituted aryl group, arylmethyl group, substituted arylmethyl group, tri C 1-4 alkylsilyl group or diphenylmethylsilyl group];
R 2 —NH 2 (2)
[In the formula, R 2 represents allyl group, aryl group, substituted aryl group, arylmethyl group or substituted arylmethyl group]; and
[In the formula, R 1 and R 2 represent the same meaning as aforementioned].
3. The method according to claim 1 , wherein said method comprises the process of allowing the compound represented by the following formula (1) to react with a compound represented by the following formula (2) under the presence of dehydrating agent to produce the compound represented by formula (3):
[In the formula, R 1 represents C 1-4 alkyl group, allyl group, C 1-4 alkyloxy C 1-4 alkyl group, C 1-4 alkyloxy C 1-4 alkyloxy C 1-4 alkyl group, aryl group, substituted aryl group, arylmethyl group, substituted arylmethyl group, tri C 1-4 alkylsilyl group or diphenylmethylsilyl group]; and
R 2 —NH 2 (2)
[In the formula, R 2 represents allyl group, aryl group, substituted aryl group, arylmethyl group or substituted arylmethyl group].
4. The method according to claim 1 , wherein said method comprises a process of subjecting nitrile group in the compound of formula (4) to acid hydrolysis, and further deprotecting hydroxyl group and amino group moieties in the compound of formula (4) to obtain L-2-amino-4-(hydroxymethylphosphinyl)-butanoic acid represented by the following formula (5):
5. The method according to claim 1 , wherein said R 1 is C 1-4 alkyl group, and R 2 is benzyl group or p-methylbenzyl group.
6. A method for producing L-2-amino-4-(hydroxymethylphosphinyl )-butanoic acid represented by the following formula (5);
said method comprising:
a process of allowing a compound represented by the following formula (1) to react with a compound represented by the following formula (2) under the presence of dehydrating agent to obtain a compound represented by the following formula (3);
a process of allowing a compound represented by the following formula (3) to react with hydrogen cyanide under the presence of an asymmetric catalyst to obtain a compound represented by the following formula (4); and
a process of allowing nitrile group in the compound of formula (4) to acid hydrolysis, and further deprotecting hydroxyl group and amino group moieties in the compound of formula (4);
[In the formula, R 1 represents C 1-4 alkyl group, allyl group, C 1-4 alkyloxy C 1-4 alkyl group, C 1-4 alkyloxy C 1-4 alkyloxy C 1-4 alkyl group, aryl group, substituted aryl group, arylmethyl group, substituted arylmethyl group, tri C 1-4 alkylsilyl group or diphenylmethylsilyl group];
R 2 —NH 2 (2)
[In the formula, R 2 represents ally group, aryl group, substituted aryl group, arylmethyl group or substituted arylmethyl group];
[In the formula, R 1 and R 2 represent the same meaning as aforementioned]; and
[In the formula, R 1 and R 2 represent the same meaning as aforementioned].
7. The method according to claim 1 , wherein said asymmetric catalyst is a compound represented by the following formula (6):
[In formula (6), R 3 represents R 5 R 6 N (herein, R 5 and R 6 are the same or different, and represent hydrogen atom, C 1-4 alkyl group, phenyl group or benzyl group respectively, except for the case where both of them are hydrogen atom at the same time), R 4 represents hydrogen atom or C 1-4 alkyl group, X represents oxygen atom or sulfur atom].
8. The method according to claim 1 , wherein said hydrogen cyanide is a product generated in a reaction system using a mixture of a compound represented by R 7 CN (herein, R 7 represents trimethylsilyl group, triethylsilyl group, or tert-butyldimethylsilyl group) and a compound represented by R 8 OH (herein, R 8 represents C 1-4 alkyl group); or a product generated in a reaction system using a mixture of a compound represented by MCN (herein, M represents potassium or sodium) and acetic acid or ammonium chloride.
9. A compound represented by the following formula (3):
[In the formula, R 1 represents C 1-4 alkyl group, allyl group, C 1-4 alkyloxy C 1-4 alkyl group, C 1-4 alkyloxy C 1-4 alkyloxy C 1-4 alkyl group, aryl group, substituted aryl group, arylmethyl group, substituted arylmethyl group, tri C 1-4 alkylsilyl group or diphenylmethylsilyl group; R 2 represents allyl group, aryl group, substituted aryl group, arylmethyl group or substituted arylmethyl group].
10. A compound represented by the following formula (4):
[In the formula, R 1 represents C 1-4 alkyl group, allyl group, C 1-4 alkyloxy C 1-4 alkyl group, C 1-4 alkyloxy C 1-4 alkyloxy C 1-4 alkyl group, aryl group, substituted aryl group, arylmethyl group, substituted arylmethyl group, tri C 1-4 alkylsilyl group or diphenylmethylsilyl group; R 2 represents allyl group, aryl group, substituted aryl group, arylmethyl group or substituted arylmethyl group].
11. The method according to claim 2 , wherein said R 1 is C 1-4 alkyl group, and R 2 is benzyl group or p-methylbenzyl group.