FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing compounds of formula I 
The method is realised via cyclisation of a compound of formula (IV) with an intermediate compound Int4 at room temperature to obtain a compound of formula (III), reducing the nitro group in the compound of formula (III) to obtain a compound of formula (II). Further, by bonding the compound of formula (II) to a compound of formula Int5 in an aprotic solvent, a compound of formula (I) is obtained (structural formulae of compounds (II), (III), (IV), Int4, Int5 are given in the claim).
EFFECT: improved method of producing compounds of formula (I).
25 cl, 3 dwg, 4 ex
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