TITLE

Synthesis of Odd-membered Rings by the Reaction of �-Carbonylallylsilane or its Derivative as a Carbon 1,3-Dipole

AUTHOR(S)
C. Kuroda; H. Suzuki
PUB. DATE
January 2003
SOURCE
Current Organic Chemistry;Jan2003, Vol. 7 Issue 2, p115
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Syntheses and reactions of �-carbonylallylsilane, conjugated allylsilane with a carbonyl group at the �-position, or its equivalent are reviewed. The method of the preparation of this moiety can be classified into (1) the introduction of silyl group at the allylic position of a,�-unsaturated carbonyl compounds, (2) carbonylation of allylsilane at the �-position, (3) elimination from pre-constructed �- silyl carbonyl compounds, (4) The Horner-Wadsworth-Emmons coupling reaction, and (5) others. �-Carbonylallylsilane can formally react with both an electrophile and a nucleophile at the same carbon, which makes it easy to synthesize odd membered cyclic compounds, such as five or seven-membered carbocycles related to terpenoids. The reaction of this unit with C=O or C=C produces ?-lactone or cyclopentane, respectively. The Nazarov cyclization of a-(trimethylsilylmethyl)divinyl ketones and the self-cyclization of 2-(trimethylsilylmethyl)pentadienal also provide new entries to five-membered carbocycle. The homo-Diels- Alder reaction and the homo-Cope rearrangement are developed using �-(hydroxymethyl)allylsilane derivatives as the carbon 1,3-dipole.
ACCESSION #
9959160

 

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