Total Synthesis and 13C NMR Revision of Nagelamide C

Abstract

Nagelamide C (1), a dimeric pyrrole−imidazole alkaloid, exhibits antimicrobial and antibacterial activities. We demonstrate herein the first total synthesis of nagelamide C. This concise work was enabled by a series of significant transformations featuring: an imidazole benzylic Wittig olefination, a site selective bromination, and a regioselective trans-hydrostannylation/Stille coupling to construct a unique trisubstituted olefin. In addition, we show the original 13C NMR data of nagelamide C to be in error and revise the data.