The conjugate addition of a methyl group by Li2Cu3Me5 to the known enone (1) is described. The stereochemistry of this alkylation was determined by 1H n.m.r. experiments. The product (2) was converted in six steps into 10-epi-gibberellin A53(9).
M. H. Beale, J. Chem. Soc., Perkin Trans. 1, 1985, 1147 DOI: 10.1039/P19850001147
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