Lewis Acid-Promoted Intermolecular Acetal-Initiated Cationic Polyene Cyclizations
作者:Yu-Jun Zhao、Shu-Sin Chng、Teck-Peng Loh
DOI:10.1021/ja067660+
日期:2007.1.1
This paper describes a highly efficient intermolecular biomimeticpolyenecyclization method using acetal as initiators. Both good yield and asymmetricinduction were obtained.
本文介绍了一种以乙缩醛为引发剂的高效分子间仿生多烯环化方法。获得了良好的产量和不对称诱导。
Stable Bromiranium Ions with Weakly-Coordinating Counterions as Efficient Electrophilic Brominating Agents
作者:Christoph Ascheberg、Jonathan Bock、Florenz Buß、Christian Mück-Lichtenfeld、Constantin G. Daniliuc、Klaus Bergander、Fabian Dielmann、Ulrich Hennecke
DOI:10.1002/chem.201701643
日期:2017.8.25
Electrophilic halogenating agents are an important class of reagents in chemical synthesis. Herein, we show that sterically demanding bromiranium ions with weakly coordinating counterions are highly reactive electrophilic brominating agents. Despite their high reactivity these reagents are stable, in one case even under ambient conditions and can be applied in electrophilic halogenations of alkenes
Synthesis, structural characterisation, and synthetic application of stable seleniranium ions
作者:Jonathan Bock、Constantin G. Daniliuc、Klaus Bergander、Christian Mück-Lichtenfeld、Ulrich Hennecke
DOI:10.1039/c9ob00078j
日期:——
Stable seleniranium ions were prepared, their solid state structures determined and their application as highly efficient selenenylating agents was demonstrated.
稳定的硒环丙阳离子已被制备,其固态结构已确定,并证明了它们作为高效的硒化试剂的应用。
Bio-inspired polyene cyclization: aziridinyl polyene cyclization catalyzed by InBr3
This communication describes a highly efficient aziridinyl polyolefin cyclization catalyzed by InBr3 to synthesize chiral terpenoid bearing a 3-amino group in the A ring; both good yields and excellent asymmetric induction were achieved.
这篇通讯描述了在 InBr3 催化下,通过高效氮丙啶基多烯烃环化反应合成 A 环含有 3 氨基基团的手性萜类化合物的过程;该过程不仅产量高,而且具有极佳的不对称诱导性。
Straightforward Synthesis of Aromatic Polycyclic Terpenoids through Biomimetic Cascade Cyclizations Triggered by Photochemical Electron Transfer
作者:Viale Rosales、Jorge Zambrano、Martin Demuth
DOI:10.1002/ejoc.200300585
日期:2004.4
Photoinduced biomimeticcascadecyclizations of suitably functionalized terpenoid arylpolyalkenes via radical cationic intermediates represent a powerful route to polycyclic compounds in a single operational step. In all cases examined, the radical cation, created selectively and exclusively at the ψ-polyalkene position, is trapped in anti-Markovnikov fashion by water, liberating a free radical site