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):
wherein
X represents an oxygen atom or a sulfur atom;
m represents a number of 1 to 3;
R1 and R2 each represent a hydrogen atom or an alkyl group;
R4 and R5 each represent a hydrogen atom or a hydroxyl group, etc.;
R3 represents -YR8, etc.;
R6 represents a hydrogen atom, etc.; and
R7 represents a hydrogen atom, etc.
本发明的目的是提供具有优良生理活性的
维生素 D 衍
生物,作为药物,特别是作为皮肤病如牛皮癣的治疗药物,具有降低高
钙血症的作用。
本发明提供了一种式(1)的
维生素 D 衍
生物:
其中
X 代表氧原子或
硫原子;
m 代表 1 至 3 的数字;
R1 和 R2 各自代表氢原子或烷基;
R4和R5各自代表氢原子或羟基等;
R3 代表-YR8 等;
R6 代表氢原子等;以及
R7 代表氢原子等。