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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 21, 1991 - Issue 1
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Original Articles

Aldol Condensation: A Stereoselective Approach to Tetrahydrophenanthrene Derivatives and 3-Oxa-bicyclo[3.3.1]nonan-6-ones

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Pages 31-42 | Received 26 Oct 1990, Published online: 24 Sep 2006
 

Abstract

Aldol condensation of the lithium enolate of 2 with m-methoxyphenylacetaldehyde afforded 3a and 3b with good erythro stereoselectivity (5:95). Acid catalyzed cyclization of 3a gave the tetrahydrophenanthrene 5 while 3b yielded the 3-oxobicyclononanones 6. A mechanism is discussed to account for the derived products and a detailed 1H NMR structural analysis of the [3.3.1] bicyclic systems is utilized to indirectly characterize the threo and erythro alcohols 3a and 3b .

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