Abstract

A regioselective Tsuji-Trost reaction of sodium 3-allyltetronate with methyl 5-trimethylsilylpenta-2,4-dienyl carbonate was developed. Carbon-carbon bond formation at the more highly substituted terminus of the pentadienyl residue was possible by introduction of an easy to remove SiMe 3 shielding group at the remote end of the π-system. This carbonate reacted fast enough to avoid scrambling and formation of symmetric bisallyl tetronic acids. The 3-allyl-3-penta-2,4-dienyltetronic acid thus obtained is a key intermediate en route to the natural spirolactone bakkenolide A.

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