C([O:4][C@H:5]1[O:22][C@H:21]([CH2:23][O:24][C:25](=[O:27])[CH3:26])[C@@H:16]([O:17][C:18](=[O:20])[CH3:19])[C@H:11]([O:12][C:13](=[O:15])[CH3:14])[C@H:6]1[O:7][C:8](=[O:10])[CH3:9])(=O)C.C(O)(=O)C.NN>CN(C=O)C>[C:8]([O:7][C@@H:6]1[C@@H:11]([O:12][C:13](=[O:15])[CH3:14])[C@H:16]([O:17][C:18](=[O:20])[CH3:19])[C@@H:21]([CH2:23][O:24][C:25](=[O:27])[CH3:26])[O:22][C@@H:5]1[OH:4])(=[O:10])[CH3:9]In 80 ml of DMF was dissolved 5.18 g of α-D-glucose pentaacetate, and 2.37 g of hydrazine acetate was added thereto, followed by stirring at room temperature for 1.5 hours. The reaction mixture was extracted with ethyl acetate, and the ethyl acetate layer was washed with water and a saturated aqueous solution of sodium chloride, and then dried over anhydrous sodium sulfate. The solution was concentrated under reduced pressure to obtain 4.0 g of α-D-glucopyranose-2,3,4,6-tetraacetate (yield: 87%).
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