Synthesis of (+)-Aptosimon, a 4-Oxofurofuran Lignan, by erythro Selective Aldol Condensation and Stereoconvergent Cyclization as the Key Reactions

Abstract

   The 4-oxofurofuran lignan, (+)-aptosimon (1), was synthesized from γ-butyrolactone (9). To construct the two benzylic chiral center of (+)-aptosimon (1), highly erythro selective aldol condensation and stereoconvergent SN1 intramolecular cyclization were used as the key reactions.