FIELD: organic chemistry. SUBSTANCE: desired product has formula I where U represents C1-C10-alkoxycarbonyl, A represents C1-C10-alkyl or C2-C10-alkynyl having unsaturated carbon atom which is bound with indole; it may have substituents which are chosen of C1-C10-alkoxycarbonyl, phenyl being substituted or not by C1-C10-alkoxy group and by C1-C10-alkoxycarbonyl. (2-nitrophenyl)acetaldehyde having formula II where A represents radical with formula III where [C(O)ORh]Rh-C1-C6-alkyl and U - C(O)ORj, Rj-C1-C6-alkyl is intermediate product. Method involves interaction of enamine with alkylating agent A-X having unsaturated carbon atom which is bound with leaving halide atom X and A is as it mentioned above. Said enamine has formula II where U is as it mentioned above, R-C1-C4-alkyl and two R radicals together with nitrogen to which they are bound form 1-pyrrolidynyl, 1-piperidynyl, 4-morpholynyl. To prepare compound having formula IV where A and U are the same as in compound I or IV it is necessary to carry out reaction of imine salt with reducing agent. Structure of mentioned above compounds I-IV is given in specification. EFFECT: improves efficiency of method.
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