Enantioselective Syntheses and Fragrance Properties of the Four Stereoisomers ofMagnolione® (Magnolia Ketone)
作者:Andrea Quendolin Stang、Günter Helmchen
DOI:10.1002/hlca.200590213
日期:2005.10
Enantioselective total syntheses of the fourstereoisomers of the fragrance Magnolione® (1) are described. Key step is a Pd-catalyzed asymmetric allylic alkylation displaying enantiomer excess of ≥ 99% (Scheme 2). The resultant methyl α-acetyl-2-pentylcyclopent-2-ene-1-acetate) was subjected to demethoxycarbonylation, carbonyl protection by acetalization, and epoxidation (Schemes 2 and 3). Subsequent