NOVEL VITAMIN D ANALOGUES

摘要

PCT No. PCT/DK89/00079 Sec. 371 Date Oct. 10, 1990 Sec. 102(e) Date Oct. 10, 1990 PCT Filed Apr. 7, 1989 PCT Pub. No. WO89/10351 PCT Pub. Date Nov. 2, 1989. (I) The present invention relates to compounds of formula (I), in which formula, n is an integer from 1-7; and R1 and R2, which may be the same or different, stand for hydrogen, or lower alkyl (but with the proviso that when n=1, R1 and R2 cannot simultaneously be hydrogen, nor can R1 and R2 simultaneously be an alkyl group independently chosen from methyl, ethyl and normal-propyl, and when n=2, R1 and R2 cannot simultaneously be methyl), or lower cyclo-alkyl, or, taken together with the carbon (starred in formula I) bearing the hydroxyl group, R1 and R2 can form a saturated or unsaturated C3-C9 carbocyclic ring; and R3 and R4 represent either simultaneously hydrogen, or when taken together constitute a bond, such that a double bond connects carbons 22 and 23; including diastereoisomeric forms (e.g. E or Z configuration of the 22,23-double bond; R or S configuration at the starred carbona atom) of the compounds of formula (I), in pure form or in mixtures. The present compounds find use in both the human and veterinary practice and show antiinflammatory and immuno-modulating effects as well as strong activity in inducing differentiation and inhibiting undesirable proliferation of certain cells, including cancer cells and skin cells.