Naturally occurring thienyl-substituted spiroacetal enol ethers fromArtemisia ludoviciana
✍ Scribed by Hofer, Otmar ;Wallnöfer, Bruno ;Widhalm, Michael ;Greger, Harald
- Book ID
- 102900238
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 526 KB
- Volume
- 1988
- Category
- Article
- ISSN
- 0947-3440
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✦ Synopsis
i n addition to the already known 2-(2-thienylmethylene)-l,6dioxaspiro[4.S]dec-3-ene (l), a hitherto unknown thienyl-substituted spiroacetal enol ether was isolated from the subterranean parts of Arreniisia ludoviciana, the structure of which was eluci-
📜 SIMILAR VOLUMES
## Abstract The absolute configurations of three 6,7‐oxygenated 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 6,7‐epoxide.
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