catalyst lead to pure (Z)-products. Analysis by chiral GC revealed the natural frog compound to be (5Z,13S)-5-tetradecen-13-olide (1). This compound is also present in the secretion of other hyperoliid frogs as well as in femoral glands of male mantellid frogs such as Spinomantis aglavei. The mass spectra of the synthesized macrolides as well as their rearranged isomers obtained during ring-closing metathesis
雄性非洲芦苇蛙Hyperolius cinnamomeoventris的腺体含量由脂族大环内酯和
倍半萜组成。虽然很容易确定已知的大环
内酯类双
甘露糖苷A,但建议另一种主要成分的结构为十三碳四烯酸-内酰胺。两种候选化合物(Z)-5-和(Z)-9-十四烯-13-内酯的合成表明前者是天然存在的化合物。该合成以闭环复分解为关键步骤。尽管Hoveyda-Grubbs催化剂提供了广泛的异构产物,但(Z)选择性Grubbs催化剂可生成纯的(Z)产物。通过手性GC分析发现天然青蛙化合物为(5Z,13S)-5-十四烯-13-内酰胺(1)。该化合物也存在于其他高脂蛙的分泌物中,以及雄性有芒man蛙的股腺中,例如Spinomantis aglavei。合成的大环内酯及其在闭环复分解过程中获得的重排异构体的质谱表明,可以根据不饱和大环内酯的EI质谱确定双键的位置。特征离子的出现可以通过本文提出的裂解途径来解释。相反