根据提供的信息,关于熊去氧胆酸的制备方法主要介绍了两种途径:
以鹅去氧胆酸为原料的方法:
以猪胆盐或猪胆汁为原料的方法:
这两种方法中,第一种是化学合成路线,而第二种则是基于天然产物的提取。
A number of ecdysone analogues were prepared to study the effect of structural changes on biological activity. It was found that analogues with the 5α-configuration or a 3,5-cyclo structure were inactive, that a 3β-hydroxy group enhances activity but is not essential for activity, and that 3β-substituents decrease activity as follows: OMe (60%), OAc (25%) and OEt (10%). The keto diol (3), keto alcohol (9) and amide (36) were found to be highly toxic to mosquito larvae.