FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method of synthesis of compound of the formula (III) or its salt: 
where R1 means tert.-butoxycarbonyl, benzyl; R3 means C1-C6-alkyl by interaction of compound of the formula (I): 
where R1 has value indicated above and R2 means methanesulfonyl group or p-toluenesulfonyl group with compound of the formula (II): 
in the presence of a base. Invention relates also to the use of compound of the formula (III) for synthesis of compound of the formula (V): 
where R1 means tertiary butoxycarbonyl-group, benzyl-group; R3 means C1-C6-alkyl by means of interaction of compound of the formula (III) with compound of the formula (IV): 
where X means halogen atom, p-toluenesulfonyloxy- -group in the presence of a base. EFFECT: improved method of synthesis. 29 cl
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