An efficient method for the synthesis of (+)-buergerinin F is established via the enantioselective aldol reaction of a tetra-substituted ketene silyl acetal with crotonaldehyde, followed by intramolecular Wacker-type ketalization.
Enantioselective Aldol Reaction of Tetrasubstituted Ketene Silyl Acetals with Achiral Aldehydes for the Construction of Asymmetric Tertiary Alcohols: An Application for the Divergent Total Syntheses of Buergerinins F and G
febrifuge agent having a unique trioxatricyclo[5.3.1.0¹,5]undecane skeleton, is stereoselectively prepared by means of the enantioselective aldol reactions via ten linear steps from crotonaldehyde in 18% overall yield including an effective intramolecular Wacker-type ketalization of the dihydroxy-γ-lactone as a key step. In addition to the former establishment for the synthesis of (+)-buergerinin F, effective