The object of the present invention is to provide a vitamin D derivative exhibiting excellent physiological activity as medicines, in particular as therapeutic agents for skin disease including psoriasis, and having decreased hypercalcemic activity.
The present invention provides vitamin D derivatives represented by the general Formula (1):
wherein
in Formula (1), X is oxygen or sulfur;
R1 is hydrogen or Formula (2)
R2 is hydrogen or alkyl;
R3 and R4 are hydrogen or alkyl or R3 and R4 together form a double bond between the 16- and 17-positions;
R5 is hydrogen or -OR13 in which R13 is hydrogen or a protecting group; and
R6 is hydrogen or a protecting group.
本发明的目的是提供一种
维生素 D 衍
生物,该衍
生物作为药物,特别是作为包括牛皮癣在内的皮肤病的治疗药物,具有优异的生理活性,并且具有降低高
钙血症的活性。
本发明提供通式(1)所代表的
维生素 D 衍
生物:
其中
式(1)中,X 是氧或
硫;
R1 是氢或式(2)
R2 是氢或烷基
R3 和 R4 是氢或烷基,或 R3 和 R4 一起在 16 位和 17 位之间形成双键;
R5 是氢或-OR13,其中 R13 是氢或保护基;以及
R6 是氢或保护基团。