The Pauson–Khand reaction as a new entry to the synthesis of bridged bicyclic heterocycles: application to the enantioselective total synthesis of (−)-alstonerine
作者:Kenneth A. Miller、Charles S. Shanahan、Stephen F. Martin
DOI:10.1016/j.tet.2008.02.066
日期:2008.7
Moreover, the PKR of cis-2,6-disubstituted piperazine enynes allowed the preparation of diazabicyclo[3.3.1]nonanes fused to cyclopentenones. This new strategy for the synthesis of azabridged bicyclic frameworks was exploited as a key step in a concise, enantioselective total synthesis of the macroline alklaoid (-)-alstonerine.
描述了 Pauson-Khand 反应 (PKR) 在合成 azabridged 双环结构中的首次应用。含有与环戊烯酮稠合的氮杂双环[3.3.1]壬烷和氮杂双环[3.2.1]辛烷环的化合物是通过顺式2,6-二取代N-酰基哌啶烯炔底物的PKR有效构建的,其中许多可以很容易地从4-甲氧基吡啶分几步。此外,顺式 2,6-二取代哌嗪烯炔的 PKR 允许制备与环戊烯稠合的二氮杂双环 [3.3.1] 壬烷。这种合成 azabridged 双环框架的新策略被用作大环生物碱 (-)-alstonerine 简洁、对映选择性全合成的关键步骤。