Mark D. Andrews, Andrew G. Brewster, Katherine M. Crapnell, Ashley J. Ibbett, Tim Jones, Mark G. Moloney, Keith Prout and David Watkin
Regioselective Dieckmann cyclisations using an N-acyloxazolidine derived from L-serine give substituted tetramic acids in high yield and enantioselectivity. The products are easily deprotected under mild conditions to give hydroxymethyltetramic acids.