Rearrangements of tricyclic ketones: [3.3.3]propellane formation via a γ-enolate revealed in an approach to the pentalenene skeleton through β-enolization
作者:
Hemant A. Patel,
J. B. Stothers,
S. E. Thomas,
期刊:
Canadian Journal of Chemistry
(NRC Available online 1994)
卷期:
Volume 72,
issue 1
页码: 56-68
ISSN:0008-4042
年代: 1994
DOI:10.1139/v94-010
出版商: NRC Research Press
数据来源: NRC
摘要:
The known isomerization of the tricyclo[5.3.1.01,5]- to the [6.3.0.01,5]undecane skeleton by β-homoenolization led to examination of 2,9,9-trimethyl-6-methoxymethyltricyclo[5.3.1.01,5]undecanone (6) as a potential precursor for the synthesis of pentalenene, a naturally occurring sesquiterpenoid, utilizing a β-enolate rearrangement as a key step. While the anticipated rearrangement of6occurs, it is a minor process. The major rearrangement product arises by generation of a γ-enolate intermediate from a tricyclic enone formed by loss of methanol from6. This constitutes a new route to [3.3.3]propellanes and provides a third example of γ-enolate rearrangement. Structures of the products were established primarily from their1H and13Cmr spectra.
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