Antiparasitic compounds of formula (I):
The broken line at the 22-23 position representing an optional double bond and either R¹ is H or OH and the double bond is absent or the double bond is present and R¹ is absent;
R² is optionally substituted phenyl, or a group of formula (II):
wherein X is 0, S or -CH₂-, abc and d are 0-2 and a+b+c+d≦5
R³ is H or Me
R⁴ is H, OH or 4¹-(alpha-L-oleandrosyl)-alpha-L-oleandrosyloxy.
The compounds are prepared by fermentation of Streptomyces avermitilis in the presence of an N-alkanoyl cysteamine thioester containing R².
式(I)的抗寄生虫化合物:
22-23 位的断线代表任选双键,R¹ 为 H 或 OH 且不含双键,或双键存在且不含 R¹;
R² 是任选取代的苯基或式 (II) 的基团:
其中 X 是 0、S 或-CH₂-,abc 和 d 是 0-2 且 a+b+c+d≦5
R³ 是 H 或 Me
R⁴是H、OH或4¹-(alpha-L-oleandrosyl)-alpha-L-oleandrosyloxy。
这些化合物是在含有 R² 的 N-烷酰基半
胱胺硫酯存在下,通过链霉菌(Streptomyces avermitilis)发酵制备的。