Dorel R, Echavarren AM. Ready Access to the Echinopines Skeleton via Gold(I)-Catalyzed Alkoxycyclizations of Enynes.
J Org Chem 2016;
81:8444-54. [PMID:
27529429 PMCID:
PMC5028773 DOI:
10.1021/acs.joc.6b01607]
[Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The
[3,5,5,7] tetracyclic skeleton of echinopines has been stereoselectively
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.
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