A new synthetic route for construction of the core moiety of zaragozic acids from 2,5-furandimethanol (2) is described. This synthesis involves highly stereocontrolled transformation of 2 into 7-oxabicyclo[2.2.1]beptane derivative 13, and the Grob fragmentation-reduction-iodo acetalization reaction
A new route for the construction of the AB-ring core of Taxol
โ Scribed by Yumi Shimada; Makoto Nakamura; Toshimasa Suzuka; Junji Matsui; Ryo Tatsumi; Ken Tsutsumi; Tsumoru Morimoto; Hideo Kurosawa; Kiyomi Kakiuchi
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- French
- Weight
- 114 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
A new method for the construction of the AB-ring core of Taxol was developed utilizing a new skeletal transformation protocol as a pivotal step. The acid-catalyzed rearrangement of the cyclopentenone-allene photoadduct gave a bridged seven-membered ketone, which was easily transformed, using the intramolecular Suzuki reaction and the oxidative cleavage of the vicinal diol, to the bicyclic diketone.
๐ SIMILAR VOLUMES
The 5-mesyloxy-12-alcohol lib, obtained in eight steps from 5a , via angular hydroxylation is transformed by Grob fragmentation into the highly functionalized taxane precursor 12.
An elegant stereocontrolled synthesis of a highly functionalized C ring fragment of taxol ยฎ is d~-ribed. The route utilises a new Diels-Alder reaction followed by regioselective opening ofanhyth'ide, reductive dechlorination, Baeyer-Villiger oxidation of norbornenone system and stereodirected hydrob