Evolution of a Synthetic Strategy for the Variecolortide
European Journal of Organic Chemistry, 2012, DOI: 10.1002/ejoc.201200712, Volume 2012, Issue 27, pages 5151–5161 published on 13.08.2012
The variecolortides are a family of unusual natural products that combine motifs from a variety of biosynthetic streams. Herein, we present the gradual evolution of a convergent synthetic strategy that ultimately culminated in a reaction cascade featuring a hydrogen shift and a cycloaddition followed by a spontaneous air oxidation. Attempts to link an anthrone building block with an exo-methylene diketopiperazine using radical chemistry were ultimately unsuccessful, but led to interesting observations that shaped our successful strategy. The total synthesis of variecolortide C is presented for the first time.