component of the host-specificcorn pathotoxin produced by Phyllostictamaydis , have been synthesized as stereoisomeric mixtures. All the mimics synthesized have four β-ketol groups spaced by varying lengths of methylene chains or by a 1,3-diene chain. Mimics with the shorter methylene side-spacers or with the diene side-spacers are 30- to 300-fold less toxic than the native toxin, but the remaining
摘要 为了建立构效关系,以立体异构混合物的形式合成了 12 种 PM-毒素 A 的模拟物,PM-毒素 A 是由玉米叶霉产生的宿主特异性玉米致病毒素的一种成分。所有合成的模拟物都有四个 β-酮醇基团,由不同长度的亚甲基链或 1,3-二烯链隔开。具有较短亚甲基侧间隔或二烯侧间隔的模拟物的毒性比天然毒素低 30 至 300 倍,但其余化合物的毒性与天然毒素相同或更高。这些结果可以通过假设 β-酮醇基团的分子内结合可能产生两种类型的笼状结构来解释,这些结构具有活性和活性较低的构象。