A process for preparing vitamin D derivatives having the following formula:
1
wherein R
1
, R
2
, R
3
, and R
4
, which may be the same or different, represent a hydrogen atom or a protecting group, comprising:
reacting a compound of formula (2)
2
wherein R
1
represents a hydrogen atom or a protecting group, with a compound having the formula (3)
3
wherein R
1
represents a hydrogen atom and R
2
, R
3
, and R
4
, which are the same or different, represent a hydrogen atom or a protecting group.
一种制备具有下式的
维生素 D 衍
生物的工艺:
1
其中 R
1
, R
2
, R
3
和 R
4
可以相同或不同,代表
氢原子或保护基团,包括
使式 (2) 的化合物反应
2
其中 R
1
代表
氢原子或保护基团,与式 (3)
3
其中 R
1
代表
氢原子,R
2
, R
3
和 R
4
代表
氢原子或保护基团。