The first enantioselective syntheses of highly oxygenated lobane diterpenes, (+)-lobatrienolide 4 and (+)-lobatrientriol 5, have been achieved, starting with (4R,5R)-1-acetoxy-4-isopropenyl-5-methyl-5-vinylcyclohex-1-ene 10b which itself has been prepared from (+)-nopinone 7 as a versatile building block toward the asymmetric synthesis of natural products.
M. Kato, H. Kosugi, T. Ichiyanagi and O. Yamabe, J. Chem. Soc., Perkin Trans. 1, 1999, 783 DOI: 10.1039/A809983I
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