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 - Ghosh, Arun K; Li, Jianfeng; Perali, Ramu Sridhar (Synthesis, 2006)