FIELD: organic chemistry, chemical technology, vitamins.
SUBSTANCE: invention relates to novel intermediate compounds used for synthesis of derivatives of vitamin D and represented by the formula (I): 
wherein Y1 represents hydrogen atom or tert.-butyldimethylsilyl group; Y2 represents tert.-butyldimethylsilyl group; Y3 represents hydrogen atom or tetrahydro-2-pyranyl group wherein Y3O-group is in R-configuration; R1 and R2 are bound and form methylene group. Except for, invention relates to novel compounds represented by the formula (II): 
wherein Y2 represents tert.-butyldimethylsilyl group; Y3 represents hydrogen atom or tetrahydro-2-pyranyl group and Y3O-group is in R-configuration. These compounds are used as intermediate substances for synthesis of compounds of the formula (I).
EFFECT: valuable properties of intermediate compounds.
8 cl, 1 dwg, 8 ex
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