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,作为药物表现出优异的生理活性,特别是作为治疗皮肤疾病,包括
银屑病的治疗剂,并具有降低的高
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共同形成16位和17位之间的双键;R5是
氢或—OR13,其中R13是
氢或保护基;R6是
氢或保护基。