Reaction of lithium dialkylcuprates with the bridgehead 13-methanesulfonate of a gibberellin in the presence of BF3·Et2O gives the corresponding 13-alkyl derivative in >70% yield; the reaction is used in the synthesis of 13-methyIGA41.
M. Penny and C. L. Willis, J. Chem. Soc., Chem. Commun., 1993, 1111 DOI: 10.1039/C39930001111
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