Vitamin D compounds and method of preparing these compounds

摘要

The invention relates to a new vitamin D compound of the general formula wherein: R1 is a hydrogen atom or a hydroxy group; R2 is a (C1-C3)alkyl group, a hydroxy(C1-C3)alkyl group, a (C1-C2)alkoxymethyl group or a (C2-C3)alkenyl or alkynyl group; R3 is a branched or non-branched, saturated or unsaturated aliphatic 3- to 5 -membered hydrocarbon or oxahydrocarbon biradical, having at least 3 atoms in the main chain and being optionally substituted with one or more substituents selected from epoxy, fluoro and hydroxy; R4 is a sec. or tert. (C3-C6)alkyl group or a (C3-C6)cycloalkyl group; and A and B are each individually hydrogen atoms or methyl groups, or A and B form together a methylene group. The invention further relates to a method of preparing these compounds and to their use in pharmacotherapy and cosmetics.