FIELD: organic chemistry, chemical technology, medicine.
SUBSTANCE: invention relates to intermediates compounds of formulae (II) 
, (III) 
and (IV) 
wherein each R and R' represents independently of one another (C1-C3)-lower alkyl, and its optical isomers and salt; or each R and R' means independently of one another (C1-C3)-lower alkyl; Ar represents dihydrobenzodioxinyl, benzodioxinyl or phenyl optionally substituted with substitutes up to three-fold and chosen independently from halogen atom, methoxy-group, halogenmethyl, dihalogenmethyl and trihalogenmethyl, and its optical isomers; or Ar represents dihydrobenzodioxinyl or benzodioxinyl, or phenyl optionally substituted with substitutes up to three-fold chosen from halogen atom, methoxy-group, halogenmethyl, dihalogenmethyl and trihalogenmethyl, and its optical isomers. Also, invention relates to a method for synthesis of compounds of formulae (III), (IV) and compound of the formula (V) given in the invention description, and these compounds are intermediates substances used in synthesis of agent binding 5-HT1A receptors and can be used in treatment of disorders of the central nervous system. Invention provides simplifying the process and preparing optically preferable piperazines.
EFFECT: improved method of synthesis, valuable medicinal properties of compounds.
13 cl, 7 ex
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