The object of the present invention is to provide vitamin D derivatives that have excellent physiological activities as medicines, particularly as therapeutic agents for skin diseases such as psoriasis, and that have a reduced hypercalcemic effect.
The present invention provides a vitamin D derivative of Formula (1):
1
wherein
X represents an oxygen atom or a sulfur atom;
m represents a number of 1 to 3;
R
1
and R
2
each represent a hydrogen atom or an alkyl group;
R
4
and R
5
each represent a hydrogen atom or a hydroxyl group, etc.;
R
3
represents —YR
8
, etc.;
R
6
represents a hydrogen atom, etc.; and
R
7
represents a hydrogen atom, etc.
本发明的目的是提供作为药物的维生素D衍生物,特别是作为治疗银屑病等皮肤疾病的治疗剂,并且具有减少高钙血症作用的维生素D衍生物。
本发明提供了化学式(1)的维生素D衍生物:
1
其中
X代表氧原子或硫原子;
m代表1至3的数字;
R
1
和R
2
分别代表氢原子或烷基;
R
4
和R
5
分别代表氢原子或羟基等;
R
3
代表—YR
8
等;
R
6
代表氢原子等;以及
R
7
代表氢原子等。