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.;
R7 represents a hydrogen atom, etc.
本发明的目的是提供具有出色生理活性的
维生素D衍
生物作为药物,特别是作为治疗
银屑病等皮肤疾病的治疗剂,并具有减少高
钙血症作用。本发明提供了一种式为(1)的
维生素D衍
生物:其中X表示氧原子或
硫原子;m表示1到3的数字;R1和R2分别表示氢原子或烷基;R4和R5分别表示氢原子或羟基等;R3表示-YR8等;R6表示氢原子等;R7表示氢原子等。