Synthetic study of marine lobane diterpenes: efficient synthesis of (+)-fuscol

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Hiroshi Kosugi, Osamu Yamabe and Michiharu Kato


Abstract

As part of a synthetic study on marine natural products, the enantioselective synthesis of (+)-fuscol 4, a representative lobane diterpene, has been achieved in 10 steps and ca. 20% overall yield from (4R,5R)-1-acetoxy-4-isopropenyl-5-methyl-5-vinylcyclohex-1-ene 3b, which itself has been prepared as a building block directed toward the asymmetric synthesis of natural products, in more than 40% overall yield from (+)-nopinone 1.


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