Synthetic methods for (Exo,Exo)- and (Exo-,Endo)-2,6-Diarylbicycio [3:3:0] octane lignans: Syntheses of (±)-aptosimon, (±)- styraxin, (±)- asarinin, and (±)- pluviatilol
An efficient method for the stereocontrolled synthesis of the unsymmetrically substituted 4-oxofurofuran lignan 1 has been developed based on a stereocontrolled aldol reaction of the succinic anhydride derivative 20 with an aromatic aldehyde employing (±)-styraxin as a representative example.
Synthetic methods for (Exo,Exo)- and (Exo-,Endo)-2,6-Diarylbicycio [3:3:0] octane lignans: Syntheses of (±)-aptosimon, (±)- styraxin, (±)- asarinin, and (±)- pluviatilol