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
):
1
wherein
in Formula (
1
), X is oxygen or sulfur;
R
1
is hydrogen or Formula (
2
)
2
R
2
is hydrogen or alkyl;
R
3
and R
4
are hydrogen or alkyl or R
3
and R
4
together form a double bond between the
16
- and
17
-positions;
R
5
is hydrogen or -OR
13
in which R
13
is hydrogen or a protecting group; and
R
6
is hydrogen or a protecting group.
本发明的目的是提供一种表现出优异生理活性的
维生素D衍
生物作为药物,特别是作为治疗包括牛皮癣在内的皮肤疾病的药剂,并且具有降低的高
钙血症活性。
本发明提供了由通式(1)表示的
维生素D衍
生物:
其中在通式(1)中,X为氧或
硫;
R1为氢或通式(2);
R2为氢或烷基;
R3和R4为氢或烷基,或者R3和R4共同形成16-和17-位置之间的双键;
R5为氢或-OR13,其中R13为氢或保护基;以及
R6为氢或保护基。