The AB-ring fragment of ciguatoxin was synthesized in ten steps from tri-O-benzyl-D-glucal based on a highly diastereoselective ring-closing metathesis and subsequent cross metathesis.
A cross-metathesis approach to the stereocontrolled synthesis of the AB ring segment of ciguatoxin
โ Scribed by Isao Kadota; Takashi Abe; Miyuki Uni; Hiroyoshi Takamura; Yoshinori Yamamoto
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- French
- Weight
- 129 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
โฆ Synopsis
Synthesis of the AB ring segments of ciguatoxin is described. The present synthesis includes a Lewis acid mediated cyclization of allylstannane with aldehyde, cross-metathesis reaction introducing the side chain, and Grieco-Nishizawa dehydration on the A ring.
๐ SIMILAR VOLUMES
A short and efficient RCM route is reported for the construction of the key nine-membered B ring of eleutherobin starting from the readily available 1,2,5,6-diisopropylidene-D-glucose.
The synthesis of four novel ABE ring analogues of methyllycaconitine (MLA) is reported, employing olefin metathesis as the key step for appending the seven-membered B ring onto an AE bicyclic ring system. This strategy allows the stereodivergent synthesis of ABE ring analogues in which the stereoche