Efficient strategy for the stereoselective synthesis of 2,3-disubstituted benzo[α]quinolizidine alkaloids: concise synthesis of (−)-protoemetinol
作者:Hyunyoung Moon、Hongchan An、Jaehoon Sim、Kyeojin Kim、Seung-Mann Paek、Young-Ger Suh
DOI:10.1016/j.tetlet.2014.12.030
日期:2015.1
The stereoselective synthesis of (−)-protoemetinol has been accomplished through nine steps from a known homoallylic amine. The key steps of the synthesis involve the efficient preparation of an aza-Claisen rearrangement (ACR) precursor using cross metathesis and amide enolate-induced ACR followed by acid-catalyzed transannulation for the elaboration of the benzo[α]quinolizine skeleton and three stereogenic
(-)-protometetol的立体选择性合成已通过九步从已知的均烯丙基胺完成。合成的关键步骤包括使用交叉复分解和酰胺烯酸酯诱导的ACR有效制备aza-Claisen重排(ACR)前体,然后进行酸催化的反硝化反应以精制苯并[α]喹啉嗪骨架和三个立体异构中心。这种独特的合成途径为2,3-二取代的苯并[α]喹喔啉的合成提出了统一而通用的策略。