Total synthesis of steroids with substitution in the 2,3, 6, 11 or 17 positions comprising the step of cyclization of a compound having the formula
or analogues thereof where X represents
Y represents =0, β-orientated
β-orientated OH, R'and R2 may be the same or different and R' represents alkyl or aryl and R2 represents alkyl and Z represents ether or hindered ester to form the novel compounds
在 2、3、6、11 或 17 位上具有取代作用的类
固醇的全合成,包括具有以下式子的化合物的环化步骤
或其类似物的环化步骤,其中 X 代表
Y 代表 =0、β-取向的
R'和 R2 可以相同或不同,R'代表烷基或芳基,R2 代表烷基,Z 代表醚或受阻酯。