Diethyl Ether → (2S)-2-t-Butoxycarbonylamino-3-n-hexanoyloxy-2-methyl-1-propanal

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Molecular sieve 4A (220 g) and pyridinium chlorochromate (43.6 g, 0.202 mol) were added to a solution of (2R)-2-t-butoxycarbonylamino-3-n-hexanoyloxy-2-methyl-1-propanol (30.7 g, 0.101 mol) obtained in Reference example 1 (1a) in methylene chloride (600 mL) under ice-cooling and the mixture was stirred at room temperature for 2 hours. Ether was added to the reaction mixture, the mixture was filtered and the filtrate was evaporated under reduced pressure. The residue was purified by silica gel chromatography (hexane:ethyl acetate, 10:1-5:1) to obtain the title compound (28.8 g, yield: 95%).

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