A&r,& -The underground parts of Artemisia selengensis afforded a new Cl4 acotylenic six-ring epiroketal enol ether epoxide. A closely related diastereomeric compound has been isolated previously, however, the relative configuration of the epoxy ring (anti or syn to a reference oxygen) could not be e
Absolute Configurations of Three Naturally Occurring Acetylenic Spiroacetal Enol Ethers
β Scribed by Wurz, Gerald ;Hofer, Otmar ;Sanz-Cervera, Juan F. ;Marco, J. Alberto
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 307 KB
- Volume
- 1993
- Category
- Article
- ISSN
- 0947-3440
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β¦ Synopsis
Abstract
The absolute configurations of three 6,7βoxygenated acetylenic spiroacetal enol ethers were determined by using the kinetic method of Horeau. The results were confirmed by the circular dichroism of the compounds in correlation with the corresponding 6,7βepoxide.
π SIMILAR VOLUMES
Optically active 3,4-diacetoxy-2-formylmethylene-l,6-dioxaspiro[4.5]decanes have been synthesized from an acyclic keto-alcohol possessing an unsaturated aldehyde part via intmmolecular conjugate addition. The C3-and C4-ste~ogenic centers were introduced via Shatpless asymmetric dihydroxylation of an
Synthetic Study on Naturally Occurring Acetylenic Spiroacetal Enol Ethers: The First Access to Optically Active 3,4-Diacetoxy-2formylmethylene -1,6-dioxaspiro[4,5]decanes. -In view of the interest in the synthesis of naturally occuring acetylenic spiroacetal enol ethers, the title spirodecanes are p