作者:Mukaiyama, Teruaki、Asanuma, Hajime、Hachiya, Iwao、Harada, Tsunehiro、Kobayashi, Shu
DOI:——
日期:——
Palladium-Catalyzed Intramolecular Allylic Alkylation Reaction in Marine Natural Product Synthesis: Enantioselective Synthesis of (+)-Methyl Pederate, a Key Intermediate in Syntheses of Mycalamides
A novel preparation of (+)-methyl pederate (4), a key intermediate in syntheses of mycalamides (1), marine natural products from a NewZealandsponge of the genusMycale, is described. The key step involves palladium-catalyzed intramolecular allylic alkylation of the carbonate 21, derived from (+)-(4R,5R,E)-5-(tert-butyldimethylsiloxy)-4-methyl-2-hexenol (13), yielding lactones 5 in 87% yield. Demethoxycarbonylation
The first totalsynthesis of (−)-merrillianin (1), which is a natural sesquiterpene with a tricyclic structure having a cyclopentane ring and five- and seven-membered lactone parts, is demonstrated. This asymmetric totalsynthesis enabled the absolute stereostructure determination of naturally occurring (−)-1.