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
A Lewis acid-catalyzed intramolecular Hosomi–Sakurai reaction of o-(allylsilyl)benzaldehyde/ketone has been developed. The reaction proceeds through simultaneous C–Si bond cleavage and C–C bond reconstruction. This protocol provides a rapid approach for the synthesis of allyl-substituted benzoxasiloles under mild conditions.