Ring Expansive Routes to Quinolizidine Alkaloids: Formal Synthesis of (−)-Lasubine II
作者:Vijaya Gracias、Yibin Zeng、Pankaj Desai、Jeffrey Aubé
DOI:10.1021/ol035965c
日期:2003.12.1
synthesis is reported. The approach involves a conjugate reduction/alkylation sequence carried out on triisopropylsilyl-protected (S)-4-(-)-hydroxycyclopentenone, the formation of the quinolizidone ring system through nitrogen ring expansion, and the addition of an arylmetallic species to the resulting lactam. This work resulted in the preparation of 2-epi-lasubine II and a formal synthesis of lasubine
报道了两个氮环扩环反应在Lasubine生物碱合成中的应用。该方法涉及在三异丙基甲硅烷基保护的(S)-4-(-)-羟基环戊烯酮上进行的共轭还原/烷基化序列,通过氮环扩环形成喹喔啉酮环系统以及向所得内酰胺中添加芳基金属物种。这项工作导致了2-epi-lasubine II的制备和lasubine II的正式合成。[反应:看文字]