The synthesis of an advanced intermediate is described that could secure the polyoxygenated core of zaragozic acids and related natural products. The key strategy employs a two-step synthesis of the 3(2H)-furanone ring system by catalytic dihydroxylation-mercury(II)/acid-catalysed cyclisation with concomitant deprotection. The scope of the 3(2H)-furanone synthesis has been evaluated, and this ring system is shown to remain intact in multi-step reaction sequences. Access to novel, highly oxygenated 3(2H)-furanone derivatives has been achieved.
- Zaragozic acid