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The title compound {systematic name: (2 S ,3 R )-ethyl 3-[(3a S ,4 R ,6 S ,6a S )-6- tert- butyl­dimethyl­silyl­oxy-2,2-dimethyl­per­hydro­furo[3,4- d ][1,3]dioxol-4-yl]-2-nitro-3-[( S )-tetra­hydro-2 H -pyran-2-yl­oxy]propanoate}, C 23 H 41 NO 10 Si, is the product of the Henry reaction of 1- O - tert -butyl­dimethyl­silyl-2,3- O -isopropyl­idene-α- d - lyxo -penta­dialdo-1,4-furan­ose with ethyl nitro­acetate and the subsequent protection of its C-5 hydr­oxy group as tetra­hydro­pyranyl, in order to avoid the retro-Henry reaction. The tetra­hydro­pyranyl group adopts a chair conformation. The absolute configuration, assumed from the synthesis, was confirmed from the diffraction data.

acta crystallographica. section e

Ethyl 1-O-tert-butyldimethylsilyl-2,3-O-isopropylidene-5-[(2′S)-tetrahydropyran-2-yloxy]-<scp>D</scp>-glycero-α-<scp>D</scp>-manno-heptofuronate

Ethyl 1-O-tert-butyldimethylsilyl-2,3-O-isopropylidene-5-[(2′S)-tetrahydropyran-2-yloxy]-D-glycero-α-D-manno-heptofuronate