申请人:CHUGAI SEIYAKU KABUSHIKI KAISHA
公开号:US20020045772A1
公开(公告)日:2002-04-18
A steroid intermediate has the formula (II):
1
wherein A denotes alkylene of 2 to 10 carbons; X denotes halogen; R
a
, R
b
and R
c
denote, independently hydrogen or hydroxyl protecting group; and R
p
, R
q
, R
y
and R
z
are such that R
p
and R
q
together form a double bond between the 5-position and the 6-position and R
y
and R
z
together form a double bond between the 7-position and the 8-position, or R
q
and R
y
together form a double bond between the 6-position and the 7-position and R
p
and R
z
are bound to a dienophile capable of protecting conjugated double bonds.
一种甾体中间体具有公式(II):1,其中A代表2至10个碳原子的烷基;X代表卤素;Ra、Rb和Rc分别独立表示氢或羟基保护基团;而Rp、Rq、Ry和Rz是这样的,即Rp和Rq共同在5位和6位之间形成一个双键,Ry和Rz共同在7位和8位之间形成一个双键,或者Rq和Ry共同在6位和7位之间形成一个双键,而Rp和Rz则与能保护共轭双键的二烯烃基团结合。