Studies toward the total syntheses of tamulamides A and B

Abstract

Progress toward the total syntheses of tamulamides A and B, two of the more recently isolated members of the marine ladder polyether family of natural products, is described. The tricyclic cores of the both the ABC fragment and the EFG fragment have been achieved. The fused tetrahydrofuran triad core of the ABC fragment has been synthesized via a base-mediated diepoxide cascade. The challenging 6,7,6 framework of the EFG fragment has been achieved through an intramolecular reductive cyclization reaction. With successful routes to the ABC and EFG cores in hand, current work is focused on elaboration of these intermediates to the desired Wittig coupling partners en route to the first total syntheses of tamulamides A and B ... [diagrams].