FIELD: organic chemistry. SUBSTANCE: product of the general formula (I) 
: where R1 and R2 independently were taken from the order involving H, C1-C8-alkyl, unbranched C3-C8-alkyl, C3-C7-cycloalkyl, C4-C10-cycloalkylalkyl, C7-C14-aralkyl, 2-, 3- or 4-pyridinyl, 2-thienyl, 2-furanyl, phenyl substituted in definite cases with 1-3 groups. The latters were taken from the order involving F, Cl, Br, OH, C1-C4-alkoxy, C1-C4-alkyl, branched C3-C8-alkyl, CH3S(O)n,, NO2,, CF3, , CH3S(O)n or NR7R8; or R1 and R2 taken together form the group (I) where L - 0,0(CH2)m+1O or (CH2)m where m = 0-4; R3 - H, C1-C6-alkyl, allyl, benzyl or phenyl substituted in definite cases with F, Cl, CH3, CH3O or CF3; R4 - -C1-C8-alkyl with unbranched chain that is substituted with F, C3-C8-alkyl with branched chain, C3-C7-cycloalkyl, C4-C10-cycloalkylalkyl, C7-C14-aralkyl where aryl-group in definite cases is substituted with 1-3 groups. The latters were taken from the order involving C1-C4-alkyl or alkoxy-group, F, Br, Cl, NH2, OH, CN, 
, CF3, NO2, C1-C4-carboalkoxy, NR7R8 or NCOR7, C3-C6-alkenyl or alkinyl, C1-C3-perfluoroalkyl, phenyl substituted in definite cases with 1-3 groups. The latters were taken from C1-C4-alkyl, C1-C4-alkoxy, F, Br, Cl, NH2, OH, CN, CO2H, CF3, NO2, C1-C4-carboxy, NR7R8 or NCOR7, pentafluorophenyl, benzyl substituted in definite cases 1-3 groups taken from C1-C4-alkyl or alkoxy, F, Br, Cl, NH2, OH, CN, CO2H, CF3, NO2, C1-C4-carboalkoxy, NR7R8 or NCOR7: 2-, 3- or 4-pyridinyl, pyrimidinyl or biphenyl, S(O)n,O,NR5,CH2; R5 - H, C1-C6-alkyl or benzyl; R6 - H, C1-C8-alkyl, C3-C8-alkyl with branched chain, C3-C7-cycloalkyl, C3-C8-alkenyl or alkinyl, phenyl substituted in definite cases with 1-3 groups. The latters were taken from C1-C4-alkyl or alkoxy, F, Br, Cl, NH2, OH, CN, CO2H, CF3, NO2, C1-C4/ -carboalkoxy, NR7R8 or NCOR7, pentafluorophenyl, benzyl substituted in definite cases with 1-3 groups which were taken from C1-C4-alkyl or alkoxy, F, Br, Cl, NH2, OH, CN, CO2H, CF3, NO2, C1-C4-carboalkoxy, NR7R8 or NCOR7, R7 and R8 are independently, H and C1-C4-alkyl; A - C2-C10-alkyl, C3-C10-alkyl with branched chain, C3-C10-alkenyl, C3-C10-alkinyl; Y - O, S, H2, n = 0-2. Reagent 1: compound of the general formula: 
where R1,R2,R3,R6 - as indicated above. Reagent 2: isocyanate of the formula R4-N=C=O where R4 - as indicated above. EFFECT: improved method of synthesis. 6 tbl
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