Calyciphylline B 型生物碱:(-)-Daphlongamine H 和 (-)-Isodaphlongamine H 的全合成
摘要:
已完成复杂六酰基水蚤生物碱 (-)-水蚤胺 H 的首次全合成。该策略成功的关键是建立复杂性的曼尼希反应、有效的环化和高度非对映选择性氢化,以组装数克数量的带有四个连续立体中心的三环核心。在通过 Pauson-Khand 反应构建氢茚子结构之后,最终氧化还原操作提供了天然产物。重要的是,合成研究还提供了 (-)-isodaphlongamine H,并导致了对脱氧异花茶碱 B 结构的修正。
Cyclopent-2-enylaluminium as allylzinc precursor for the diastereoselective allylmetallation of non-racemic imines: applications to the synthesis of enantiomerically enriched heterocycles
A sequential titanium-catalyzed/hydroalumination/transmetallation/allylation of non-racemic imines which provides tunable homoallylamines for heterocyclic synthesis is presented.
A Versatile and Highly Stereoselective Synthesis of Diethyl (1-Aminoalkyl)thiophosphonates
作者:Chengye Yuan、Zhilong Chen、Jinfeng Li
DOI:10.1055/s-0029-1217054
日期:2009.12
excellent enantioselectivity by nucleophilic addition of diethyl thiophosphonate to N-(tert-butylsulfinyl)imines under mild conditions. There is no evidence indicating that the reaction is influenced by electronic or steric effects of the substrates. nucleophilic additions - thiophosphonates - imines - sulfinamides - sulfonamides