A totalsynthesis of lycoposerramine-R was accomplished. The synthesis featured a Claisen–Ireland rearrangement to install a two-carbon unit, and a hetero-Diels–Alder reaction to form a cyclic enol ether that reacted with an ethynyl group to construct a cis-hydrindane core containing a quaternary carbon. A 2-pyridone synthesis using 2-(phenylsulfinyl)acetamide was used to complete the synthesis.
A Conia‐Ene‐Type Cyclization under Basic Conditions Enables an Efficient Synthesis of (−)‐Lycoposerramine R
作者:Felix W. W. Hartrampf、Takayuki Furukawa、Dirk Trauner
DOI:10.1002/anie.201610021
日期:2017.1.16
An enantioselective total synthesis of the Lycopodium alkaloid lycoposerramine R is presented. It relies on a base‐mediated cyclization that resembles the Conia‐ene reaction of ynones and gold‐catalyzed variants thereof. Thus, hydrindanones and other functionalized ring systems bearing an exocyclic alkene can be rapidly accessed at room temperature without noble metal catalysis or substrate preactivation
Methoxypyridines in the Synthesis of <i>Lycopodium</i> Alkaloids: Total Synthesis of (±)-Lycoposerramine R
作者:Vishnumaya Bisai、Richmond Sarpong
DOI:10.1021/ol100823t
日期:2010.6.4
A methoxypyridine serves as a masked pyridone in a concise synthesis of the Lycopodiumalkaloid lycoposerramine R, which has been prepared for the first time. The key step of the synthesis is the use of an Eschenmoser Claisen rearrangement to forge a key quaternary carbon center.
Collective Total Syntheses of Five
<i>Lycopodium</i>
Alkaloids
作者:Feifei He、Shangbiao Feng、Yulong Zhao、Hongliang Shi、Xiaoguang Duan、Huilin Li、Xingang Xie、Xuegong She
DOI:10.1002/anie.202205439
日期:2022.8.8
collective total syntheses of five Lycopodiumalkaloids were accomplished in an enantioselective and protecting-group-free manner. The syntheses included a gold-catalyzed enamide–alkyne cycloisomerization and the establishment of skeletal diversification approaches at different reactive sites of the tricyclic skeleton to achieve divergent total syntheses of Lycopodiumalkaloids.