A Ring Contraction Strategy toward a Diastereoselective Total Synthesis of (+)-Bakkenolide A
作者:Vânia M. T. Carneiro、Helena M. C. Ferraz、Tiago O. Vieira、Eloisa E. Ishikawa、Luiz F. Silva
DOI:10.1021/jo100108b
日期:2010.5.7
presented from the readily available optically active Wieland−Miescher ketone. This novel synthesis of this sesquiterpene lactone features the following as key stereoselective transformations: (i) the ring contraction reaction of a octalone mediated by thallium(III) nitrate (TTN); (ii) a hydrogenation to create the cis-fused junction; and (iii) the formation of the C7 quaternary center through an enolate intermediate
A General Approach Toward Bakkanes: Short Synthesis of (±)-Bakkenolide-A (Fukinanolide)
作者:D. Srinivasa Reddy
DOI:10.1021/ol048726d
日期:2004.9.1
[reaction: see text] An efficient, general, and fully stereocontrolledapproach to the family of bakkanes is disclosed. This route highlights a highly diastereoselective Diels-Alder/aldol sequence to furnish the common hydrindane precursor for the synthesis of bakkanes. The projected common intermediate was transformed to the (+/-)-bakkenolide-A in a short sequence.