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Cyclic sulfates of 5,6- and 3,5-d-glucofuranose were used to prepare 6- and 5-azido (amino) and 6- and 5-fluoro derivatives of 1,2-O-isopropylidenehexofuranoses (d-gluco and l-ido configurations). The reactions were completely regioselective and, in the case of stereogenic centers (substitution at C-5), completely stereoselective.
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