A simple new general synthesis of macrocyclic ketones: A new entry to the synthesis of exaltone and (±)-muscone
✍ Scribed by Hiroshi Suginome; Shinji Yamada
- Book ID
- 104227812
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- French
- Weight
- 245 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
We describe an efficient new synthesis of 15-membered cyclic ketones, exaltone and (+)-muscone, based on a three-carbon annelation of cyclic ketones followed by the regioselective radical cleavage of the fused bond of the resulting bicyclic systems.
As part of our continuing program to explore the potential of the 6-scission of alkoxyl radicals for organic synthesis, we have recently reported several new methods for the synthesis of cyclic ethers 2 , cyclic sulphides 3 3 , cyclic amines , furoquinolones4, furocoumarins5, medium-sized lactones 6 , benzohomotropones 7 ,
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## Abstract Treatment of the sulfonyl ketones **1a** and **1b** with potassium __t__‐butoxide in toluene or with potassium hydroxide in toluene/dimethyl sulfoxide affords in high yield the bicyclic dienes **3a** and **3b**, important precursors for __Exaltone__® and (±)‐muscone. An application of t
## Abstract A new strategy for the synthesis of muscone **(1)** using the OH‐assisted __Prins__ reaction for macrocyclic ring closure has been developed. The monoacetal **4** of (__Z__,__E__)‐4,8‐dodecadienedial **(3)**, easily obtainable from (__Z__,__E__,__E__)‐1,5,9‐cyclododecatriene **(2)**, is