The combination of ring-closing metathesis (RCM) followed by an intramolecular Pauson–Khandreaction gives direct entry to tricyclic compounds. The RCM was carried out on a hexacarbonylcobalt-complexed alkyne, this complex acting as a protecting group against enyne metathesis. The procedure was studied for dienynes containing heteroatoms and allows the building of [6,5,5] and [7,5,5] tricyclic systems
Molecular Complexity via C–H Activation: A Dehydrogenative Diels–Alder Reaction
作者:Erik M. Stang、M. Christina White
DOI:10.1021/ja2059704
日期:2011.9.28
Traditionally, C-H oxidation reactions install oxidized functionality onto a preformed molecular skeleton, resulting in a local molecular change. The use of C H activation chemistry to construct complex molecular scaffolds is a new area with tremendous potential in synthesis. We report a Pd(II)/bis-sulfoxide-catalyzed dehydrogenative Diels-Alder reaction that converts simple terminal olefins into complex cycloadducts in a single operation.