Synthesis and absolute configuration of two defensive alkaloids from the Mexican bean beetle, Epilachna varivestis
作者:Xiongwei Shi、Athula B. Attygalle、Ferrold Meinwald
DOI:10.1016/s0040-4039(97)01491-3
日期:1997.9
Syntheses of (2S,12′R)-2-(12′-aminotridecyl)-pyrrolidine (1) and (2S,12′R)-1-(2″-hydroxyethyl)-2-(12′-aminotridecyl)-pyrrolidine (2), two defensive alkaloids recently isolated from the Mexican bean beetle, Epilachna varivestis, are described. By a comparison of 1H NMR data of MTPA derivatives of natural alkaloid 2 with those of the synthetic standard, we confirm the (2S,12′R) configuration previously suggested
(2的合成小号,12' - [R)-2-(12'-aminotridecyl) -吡咯烷(1)和(2小号,12' - [R)-1-(2“ -羟基乙基)-2-(12'-aminotridecyl )-吡咯烷(2),这是最近从墨西哥甲虫Epilachna varivestis中分离出的两种防御生物碱。通过将天然生物碱2的MTPA衍生物与合成标准品的1 H NMR数据进行比较,我们确认了先前对该生物碱提出的(2 S,12'R)构型。这些分配的进一步支持是由合成和提供1个的1 H NMR调查(2S,12 'S)-1,(2 S,12 'S)-2及其MTPA衍生物。