The Changing Faces of Halogenated Marine Natural Products: Total Synthesis of the Reported Structures of Elatenyne and an Enyne from <i>Laurencia majuscula</i>

Abstract

Knocking them into shape: The total synthesis of two reported marine natural products containing halogenated pyrano[3,2-b]pyrans (see example in blue) has led to the reassignment of both structures as halogenated 2,2′-bifuranyls (red). Concomitantly an efficient route to pyrano[3,2-b]pyrans is described.