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A stereoselective synthesis of (3 R ,3a S ,6a R )-hexahydrofuro[2,3- b ]furan-3-ol, an important high affinity P 2 -ligand, in high enantiomeric excess (&gt;99%) is reported. The synthesis features an ester-derived titanium enolate based highly stereoselective anti -aldol reaction as the key step.

A Stereoselective Anti-Aldol Route to (3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-ol: A Key Ligand for a New Generation of HIV Protease Inhibitors