Temporary tethering strategies for [5 + 2] pyrone-alkene cycloadditions
摘要:
Temporary connection of alkenes to 3-alkoxy-4-pyrones via sulfur or silicon tethers allows their thermal [5 + 2] cycloaddition and ensures complete regio- and stereochemical control.
Temporary tethering strategies for [5 + 2] pyrone-alkene cycloadditions
作者:Antonio Rumbo、Luis Castedo、Antonio Mourino、Jose L. Mascarenas
DOI:10.1021/jo00073a007
日期:1993.10
Temporary connection of alkenes to 3-alkoxy-4-pyrones via sulfur or silicon tethers allows their thermal [5 + 2] cycloaddition and ensures complete regio- and stereochemical control.
Construction of Bridged Polycyclic Systems via Radical Cyclizations. Uncovering of a Novel Carbocyclization−Ring Expansion Sequence
作者:J. Ramón Rodríguez、Luis Castedo、José L. Mascareñas
DOI:10.1021/ol015643d
日期:2001.4.1
[reaction: see text]. While exploring the application of radical cyclizations to the construction of bridged polycyclic systems, we have discovered a novel tandem process consisting of an endo-cyclization of a vinyl radical onto a terminal alkene followed by a one-carbon ring expansion promoted by the resulting secondary radical.