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, 69.0 (C-4), vol.68, pp.69-73

, 20.8e20.6 (MeCO), vol.52

, 1R)-1-Dodecylsulfonyl-5N,6O-oxomethylidenemannonojirimycin (8) Compound 8 was obtained by conventional O-deacetylation (see General Methods) of 17. Column chromatography (4:1 EtOAccyclohexane / EtOAc). Yield: 12 mg (64%)

H. , 36 (dd, 1 H, J 6a,6b ¼ 9.0 Hz, J 5,6b ¼ 5.0 Hz, H-6b), 4.08 (td, 1 H, J 4,5 ¼ J 5,6a ¼ 9, vol.4

. Mhz, C-4), 68.6 (C-6), CD 3 OD): d 159.5 (CO), 74.0 (C-1), 73.0 (C-3), vol.70

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