Centres de Recerca de Catalunya (CERCA)
2016-08-16
The [3,5,5,7] tetracyclic skeleton of echinopines has been stereo- selectively accessed through a gold(I)-catalyzed alkoxycyclization of cyclopropyl- tethered 1,6-enynes. The key bicyclo[4.2.1]nonane core of the enyne precursors was readily assembled by means of a Co-catalyzed [6 + 2] cycloaddition. Furthermore, the attempted alkoxycyclization of 1,5-enyne substrates revealed an uncovered cyclopropyl rearrangement that gives rise to [3,6,5,7] tetracyclic structures.
Anglès
53
8444 p.
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