FIELD: medicine, pharmaceutics.
SUBSTANCE: invention, in particular, relates to method of obtaining compound of formula 
where R, R1 R2, R3 and PG are determined in description, or its salt, which lies in reaction of formula I 
compound with reagent, selected, for instance, from group including hydrohalic acid, thionylhydrogenide, PX*3, POX*3, PX*5, POX*5, where X* represents halogen, combination of triphenylphosphine and halogen and active derivative of organic sulfonic acid.
EFFECT: elaboration of novel method, novel method stages and novel intermediate compounds for synthesis of pharmaceutically active compounds, in particular, rennin inhibitors, such as aliskiren.
63 cl, 11 ex
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