FIELD: chemistry.
SUBSTANCE: compound of general formula IIa 
or its salt, where R1 is hydrogen or protection group of tetrazol, undergoes reaction with compound of formula 
or its salt, where R2 is hydrogen or carboxy protection group, under conditions of reduction amination, with further acylation of obtained compound of formula 
or its salt by compound of formula 
, where R3 is the group to be separated; and with removal of protection groups if required.
EFFECT: new compounds with useful biological properties.
12 cl, 11 ex
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