FIELD: chemistry.
SUBSTANCE: invention relates to a method for producing a compound of formula (IVa):
(IVa)
or pharmaceutically acceptable salt or stereoisomer thereof. Method comprises treating hydroxyalkylthiophene of formula (i): 
(i), aminoaldehyde with acetal and acid to produce a compound of formula (IVa), wherein m is 0, n is 1, R1 and R2 are each independently hydrogen or C1-4alkyl, R3 and R4 are each independently hydrogen or C1-4alkyl, R5 is hydrogen, and R6 and R7 are each independently hydrogen, halogen or C1-4alkyl. Methods for producing specific compounds of formula (IVa) are also provided.
EFFECT: invention allows producing compounds used for preventing and/or treating neurological disorders.
28 cl, 2 tbl
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