FIELD: chemistry.
SUBSTANCE: invention relates to field of organic chemistry, namely to method of obtaining compound of formula
1,
including condensation of carboxylic acid of formula
2
with aniline of formula
3 in presence of TZR®, where each R2 and R4 independently represents C1-6 alkyl with linear or branched chain, and each C1-6 alkyl with linear or branched chain is independently and optionally substituted with -OR'; each R5 represents OC(O)OR' or R4 and R5, taken together, form group 
, y represents 0, each R' represents C1-4 alkyl group, optionally substituted with one or more groups, selected from oxo and -O-C1-4-alkyl group. Invention also relates to intermediate compounds and methods of their obtaining.
EFFECT: elaborated is novel method of obtaining formula 1 compound, which can be useful as modulator of cystic fibrosis transmembrane conductance regulator (CFTR).
52 cl, 10 ex
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