8-Oxabicyclo[3.2.1]oct-6-en-3-ones: Application to the Asymmetric Synthesis of Polyoxygenated Building Blocks
✍ Scribed by Ingo V. Hartung; H. Martin R. Hoffmann
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 533 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0044-8249
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✦ Synopsis
Abstract
The development and design of reliable and efficient methods for the construction of chiral building blocks are crucial in modern natural product synthesis. 8‐Oxabicyclo[3.2.1]oct‐6‐en‐3‐ones are readily accessible scaffolds with defined stereochemical features which have been exploited for non‐aldol approaches to the preparation of chiral building blocks. Strategies for their enantioselective synthesis, including asymmetric cycloaddition methods, desymmetrization protocols, and “racemic switch operations”, are presented and evaluated.
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## Abstract Trichloro‐substituted 8‐oxabicyclo[3.2.1]oct‐6‐en‐3‐ones **6** and **7** are solvolysed by methanolic sodium methoxide to form the bicyclo[3.2.1] α,α‐dimethoxy ketones **13** and **14**, with preservation of one chloro substituent. In the case of **6a**, prolonged reaction time with an