Diversity Oriented Microwave-Assisted Synthesis of (−)-Steganacin Aza-Analogues
作者:Nuria Mont、Vaibhav Pravinchandra Mehta、Prasad Appukkuttan、Tetyana Beryozkina、Suzzane Toppet、Kristof Van Hecke、Luc Van Meervelt、Arnout Voet、Marc DeMaeyer、Erik Van der Eycken
DOI:10.1021/jo801290j
日期:2008.10.3
A novel microwave-assisted, highly efficient protocol for the synthesis of hitherto unknown aza-analogues of (-)-Steganacin, a naturally occurring bisbenzocyclooctadiene lignan lactone with potent antileukemic and tubulin polymerization inhibitory activity, has been developed. Focused microwave irradiation is demonstrated to be highly beneficial in promoting the three crucial steps of the sequence
Electrophilic C12 Building Blocks for Alkaloids: 1,1 Iterative Organoiron-Mediated Routes to (±)-Lycoramine and (±)-Maritidine
作者:G. Richard Stephenson、Caroline Roe、Elizabeth J. Sandoe
DOI:10.1002/ejoc.201001394
日期:2011.3
were used to prepare ortho-substituted (1-arylcyclohexadienyl) iron(1+) electrophiles. These were treated with Na+[Me3SiCH2CH2O2CCHCN](-) to build aryl-substituted quaternary centres in new examples of 1,1 iterative [eta(4)] -> [eta(5)]+ -> [eta(4)] -> [eta(5)]+ -> [eta(4)]} reaction sequences, which make use of the electrophilicity of the metal complex in two key carbon-carbon bond-formation steps