[H-].C([Al+]CC(C)C)C(C)C.[CH2:11]([O:18][C@@H:19]([CH3:25])[C:20](OCC)=[O:21])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.C(=O)=O.CC(C)=O.CO>CCCCCC.C(Cl)Cl>[CH2:11]([O:18][C@@H:19]([CH3:25])[CH:20]=[O:21])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1
A solution of 1.0M DIBAL (diisobutylaluminum hydride) in hexane (10 ml) was added dropwise to a stirred solution of ethyl (S)-2-(benzyloxy)propionate (obtained in Preparation 7) (2.08 g) in methylene chloride (20 ml) at −78° C. (dry-ice/acetone) for 5 minutes under nitrogen atmosphere. After 20 minutes, methanol (1.6 ml) was added dropwise to the mixture at −78° C., and the resulting mixture was stirred at room temperature for 30 minutes. The mixture was filtered through a pad of Celite, and the solid on the filter was washed with methylene chloride. The combined filtrates were concentrated in vacuo. The obtained residue was purified by silica gel (35 g) chromatography eluted with hexane/ethyl acetate (30:1) to give (S)-2-(benzyloxy)propionaldehyde (810 mg).
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