Preparation of a Key Intermediate for the Synthesis of the (�)-Pentalenolactone E Methyl Ester by Catalytic ?Palladium-Ene Cyclization?/Methoxycarbonylation
作者:Wolfgang Oppolzer、Jin-Zhu Xu、Charles Stone
DOI:10.1002/hlca.19910740302
日期:1991.5.2
Bicyclic alcohol (±)-2, an advanced intermediate for the synthesis of the methylester 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.