FIELD: organic chemistry. SUBSTANCE: product: derivatives of amino acids of the formula (I) where R1 - morpholino, carbonyl, thiomorpholinocarbonyl, hexahydro-1H-azepine-1-alcarbonyl, octahydroazocine-1-alcarbonyl, piperidinocarbonyl, lower alkanoyl; R2 - lower alkyl; R3 - lower alkyl; R - lower alkyl; X - lower alkylene; Y1 - simple bond or 
; R5 - lower alkyl; Y2-NH - or -O-. Reagent 1: compound of the formula (II). Reagent 2: compound of the formula (III). Structure of compounds I - III:
. Synthesized compounds were used in medicine. EFFECT: improved method of synthesis. 11 cl
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