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Protected 1,2-cis glycofuranosyl azides with α-d-ribo, β-d-arabino and 2-deoxy-2-fluoro-β-d-arabino configurations were efficiently prepared from the appropriate 1,2-trans glycosyl halides bearing non-participating O-2 substituent by inversion with sodium azide under phase transfer catalytic conditions (80–85% yields, 90–96% de). The same method failed to result in sufficiently good β-selectivity...
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