Starting from milbemycin D (1), milbemycin A4 (2) and milbemycin A3 (3), a series of 5-keto-5-oxime derivatives were synthesized by selective oximation at the α, β-conjugated carbonyl function of the 5-ketomilbemycins (4-6). The activities of the synthesized compounds were studied in dogs naturally infested with microfilariae of Dirofilaria immitis. The 5-keto-5-oximes of milbemycin D (7), A4 (8) and A3 (9) had quite high efficacy to control the microfilariae and more potency than their parents, while the 5-O-acyl oximes (11-15) also exhibited high activity.
从米尔贝霉素 D (1)、米尔贝霉素 A4 (2) 和米尔贝霉素 A3 (3)开始,通过对 5-酮基米尔贝霉素的 α、β-共轭羰基功能进行选择性氧化,合成了一系列 5-酮基-5-
肟衍
生物 (4-6)。研究人员在感染了软下二鞭毛虫微丝蚴的狗身上研究了合成化合物的活性。米尔贝霉素 D (7)、A4 (8) 和 A3 (9) 的 5-酮-5-
肟对控制微丝蚴具有相当高的效力,且效力高于其母体,而 5-O-酰基
肟 (11-15) 也表现出很高的活性。