FIELD: organic chemistry. SUBSTANCE: products: esters of 10-(1-hydroxyethyl)- 11-oxo-1-azatricyclo- [7,2,0,03,8]-undec-2-ene- 2-carboxylic acid of the formula (I) 
where R1 CH(R4)-O-C(O)-(O)p-R5 where R4- H, C1-C4-alkyl; p 0 or 1; R5-C1-C6-alkyl, C5-C8-cycloalkyl, phenyl; R2 methoxy-group. Reagent 1: compound of the formula (II) 
where R2 methoxy-group, Ra H or hydroxyl-protecting group. Reagent 2: esterifying agent used for removal of R1-group. Reaction condition: in the medium of organic solvent. Synthesized compounds were used in medicine. EFFECT: improved method of synthesis. 9 cl
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