作者:Shingo Harada、Takeo Sakai、Kiyosei Takasu、Ken-ichi Yamada、Yasutomo Yamamoto、Kiyoshi Tomioka
DOI:10.1002/asia.201200575
日期:2012.10
together now: A common intermediate of Kopsia alkaloids was synthesized from cis‐2,3‐disubstituted piperidine, which was obtained with 98 % ee in 85 % yield using chiral diether‐controlled asymmetric conjugate addition of lithium amide to indolepropenoate, followed by C,N dual alkylation with 1‐chloro‐3‐iodopropane. The synthesis of (−)‐kopsinine was accomplished via the intermediate in 9.0 % overall
现在在一起:用顺式2,3-二取代的哌啶合成科普萨生物碱的常见中间体,使用手性二醚控制的不对称共轭酰胺锂到吲哚丙酸酯中的收率为98%ee,收率为85%。 N与1-氯-3-碘丙烷的双烷基化反应。(-)-kopsinine的合成是通过中间体完成的,共分13个步骤,总收率为9.0%。