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The synthesis of α-D-ribopentodialdose is known, however that of α-D-xylopentodialdose is unknown.
-
The synthesis of α-D-ribopentodialdose is known, however that of α-D-xylopentodialdose is unknown.
-
-
-
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60
-
-
33947330789
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-
13C NMR spectral data.
-
13C NMR spectral data.
-
-
-
-
61
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-
33947315484
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-
Perbenzylation at room temperature under a variety of reaction conditions for prolonged time afforded a mixture of mono, di- and tribenzylated products
-
Perbenzylation at room temperature under a variety of reaction conditions for prolonged time afforded a mixture of mono-, di- and tribenzylated products.
-
-
-
-
62
-
-
33947316460
-
-
4 did not improve the yield of the product.
-
4 did not improve the yield of the product.
-
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32644434099
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67
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33947311392
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All new compounds have been characterized by 1H NMR, 13C NMR, IR, and elemental analysis. Ethyl-3,6-dideoxy-3- benzyloxycarbonylamino-1,2-O-isopropylidene-α-D- xylohept-5-ulofuranuronate (7, viscous liquid; Rf 0.65 (n-hexane-EtOAc, 5:1, α]D +3.33 (c, 0.60, CHCl3, IR (neat, 3150-3400(br, 1730, 1650 cm-1. 1H NMR (300 MHz, CDCl3, δ, 1.26 (t, J, 7.4 Hz, 3 H, 1.30 (s, 3 H, 1.50 (s, 3 H, 3.40 (d, J, 16.0 Hz, 1 H, 3.75 (d, J, 16.0 Hz, 1 H, 4.18 (q, J, 7.4 Hz, 2 H, 4.50-4.62 (br m, 2 H, 4.89 (d, J, 3.3 Hz, 1 H, 5.08 (AB quartet, J, 12.0 Hz, 2 H, 5.86 (d, J, 3.6 Hz, 1 H, 5.89 (d, J, 3.3 Hz, 1 H, 7.20-7.40 (br s, 5 H, 13C NMR 75 MHz, CDCl3, δ, 14.0, 26.1, 26.7, 46.8, 58.0, 61.7, 66.9, 83.5, 84.3, 104.7, 112.5, 127.8, 127.9, 1
-
2O): δ = 3.02-3.12 (m, 2 H, H-3), 3.16 (ddd, J = 2.1, 4.2, 8.1 Hz, 1 H), 3.36 (dd, J = 2.7, 9.3 Hz, 1 H), 3.58 (d, J = 13.5 Hz, 1 H), 3.66 (dd, J = 4.5, 11.4 Hz, 1 H), 3.77 (dd, J = 4.5, 11.4 Hz, 1 H), 3.96
-
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