Abstract
The gold(I)-catalyzed cyclization of the cyclohexa-1,3-diene bearing a terminal alkyne and a gemdiester in the tether proceeds via a cationic gold intermediate to give a tetrahydromethyleneindene derivative. Changing the gem-diester to a gem-diketone in the tether, the transient gold-stabilized carbocation is trapped intramolecularly by a methyl ketone to afford a tricyclo[5.4.04,8]undecane ring skeleton. Under the same reaction conditions, aryl-substituted cyclohexadienynes afford hexahydroacephenanthrylene rings in a diastereoselective fashion and in good yields. The reaction proceeded via attack of the aryl group onto the gold-stabilized carbocations followed by aromatization and protodemetalation to generate the tetracarbocycles. This cycloaddition can be applied to the synthesis of pentahydronapthoazulenes from aryl-substituted cycloheptadienynes and the gold(I) catalyst.
Original language | English |
---|---|
Pages (from-to) | 5326-5332 |
Number of pages | 7 |
Journal | Organometallics |
Volume | 27 |
Issue number | 20 |
DOIs | |
Publication status | Published - 2008 Oct 27 |
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry