PCT No. PCT/GB94/00975 Sec. 371 Date Jan. 5, 1996 Sec. 102(e) Date Jan. 5, 1996 PCT Filed May 6, 1994 PCT Pub. No. WO94/26707 PCT Pub. Date Nov. 24, 1994The invention relates to novel 1 alpha -hydroxy vitamin D derivatives and their 20-epi analogues, comprising compounds of general formula (I) IMAGE (I) where R1 and R2, which may be the same or different, each represents a hydrogen atom or an aliphatic, cycloaliphatic, araliphatic or aryl group or together with the nitrogen atom to which they are attached form a heterocyclic group; R3 represents a methyl group having alpha - or beta -configuration; X represents a valence bond or a C1-2alkylene group; Y represents -O-, -S-, -CH2- or -NR- where R is a hydrogen atom or an organic group; Z represents a valence bond or a C1-3alkylene group; and A= represents a cyclohexylidene moiety characteristic of the A-ring of a 1 alpha -hydroxylated vitamin D or analogue thereof, with the proviso that when -X-Y-Z- together represent an alkylene group containing up to 4 carbon atoms A= does not carry an exocyclic methylene group at the 10-position. Active compounds of the invention exhibit cell modulating activity while exhibiting a substantial lack of calcemic effect.!
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