Bicyclic alcohol (±)‐2, an advanced intermediate for the synthesis of the methyl ester 1 of pentalenolactone E, has been synthesized in nine operations starting from aldehyde 7. The key step 6 → 9 is a Pd‐catalyzed, tandem intramolecular alkyne allylation/carbonylation reaction.
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Oppolzer et al. (1991) studied this question.
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