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.
制备了多种蜕皮激素
类似物,以研究结构变化对生物活性的影响。
生物活性的影响。研究发现,具有 5α-configuration 或 3,5-cyclo 结构的类似物没有活性。
3,5-环结构的类似物没有活性,3β-羟基可增强活性,但对活性并不重要。
3β-羟基可增强活性,但并非活性的必要条件,而 3β 取代基则会降低活性。
降低活性的情况如下:OMe(60%)、OAc(25%)和 OEt(10%)。酮二醇
(3) 、酮醇 (9) 和酰胺 (36) 对蚊子幼虫有剧毒。
幼虫有剧毒。