(untitled) - Nicolaou, K C; Hale, C R. H; Nilewski, C; Ioannidou, H A; ElMarrouni, A; Nilewski, L G; Beabout, K; Wang, T T; Shamoo, Y (J. Am. Chem. Soc., 2014)
A similar reaction of cyclic 2-hydroxy-1,3-diketones into ring-expanded lactones was observed in the Nicolaou synthesis of viridicatumtoxin B; see: