FIELD: medicine. SUBSTANCE: desired products have formula I where R1 is hydrogen, lower alkyl aminocarbonyl, R2 is hydrogen, lower alkyl, cycloalkyl, phenyl-substituted lower alkyl, alkynyl, formyl, benzyloxycarbonyl, R3 is hydrogen, lower alkyl, R4 is hydrogen, hydroxy, lower alkyl aminocaboxy, - - - depicts absence of the bond or single bond. Compound having formula 2 is used as reagent 1. Said compound is affected by reduction which takes place with the help of nickel Raney in solution of sodium hydroxide. EFFECT: improved quality of desired product. 7 cl, 4 tbl
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