Total Synthesis of (+)-Bourgeanic Acid Utilizing <i>o</i>-DPPB-Directed Allylic Substitution
作者:Tomislav Reiss、Bernhard Breit
DOI:10.1021/ol9011635
日期:2009.8.6
The lichen metabolite (+)-bourgeanic acid has been synthesized utilizing a new strategy for the construction of propionate motifs relying on the o-DPPB-directed copper-mediated allylicsubstitution. This synthesis features the o-DPPB-directed allylicsubstitution employing a chiral Grignard reagent, Sharpless asymmetric epoxidation, and reductive epoxide ring opening with a higher order dimethylcuprate
Total Synthesis of (+)-Bourgeanic Acid Utilizing Desymmetrization Strategy
作者:Jhillu S. Yadav、K. V. Raghavendra Rao、K. Ravindar、B. V. Subba Reddy
DOI:10.1002/ejoc.201001199
日期:2011.1
A highly stereoselective totalsynthesis of an aliphatic depside (+)-bourgeanic acidvia (-)-hemibourgeanic acid and bourgeanic lactone is described. The key steps involved in this synthesis are desymmetrization of bicyclic olefin with Brown's asymmetric hydroboration, Gillman's reaction, TEMPO-BAIB mediated selective oxidation of 1,3-diol, Yamaguchi macro-lactonization and LiOH-mediated partial hydrolysis