FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for preparing amido acid ester that is useful as an intermediate substance in synthesis of agrochemical preparation. Invention relates to amido acid ester represented by compound of the general formula (7): 
wherein A represents substituted or free lower alkylene group, and so on; R1 represents substituted or free lower alkyl group, and so on; R3 represents hydrogen atom or lower alkyl group. Method for preparing amido acid ester involves interaction of amino acid represented by compound of the general formula (1): 
in presence of water with halogenated carboxylic acid ester represented by compound of the general formula (2): 
wherein X represents halogen atom with formation of amide represented by compound of the formula (3): 
Then amide compound interacts with halogenated carboxylic acid ester represented by compound of the general formula (4): 
wherein R2 represents substituted or free lower alkyl group, and so on; X represents halogen atom with preparing carboxylic acid mixed anhydride represented by compound of the general formula (5): 
Then carboxylic acid mixed anhydride interacts with amine compound represented by compound of the general formula (6): 
A, R1 and R3 have the same values as given above; Het represents substituted of free heterocyclic group. Invention provides reducing economic indices of the process.
EFFECT: improved preparing method.
9 cl, 2 ex
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