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20
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33847402500
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Purification of 23 and 24 on silica gel is not recommended; otherwise, a mixture of cyclized and non-cyclized products could be obtained.
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Purification of 23 and 24 on silica gel is not recommended; otherwise, a mixture of cyclized and non-cyclized products could be obtained.
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21
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33847413486
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NMR Data of (4R,5S, 1′R,2′R)-3-Butyl-4-hydroxy-2- methoxycarbonyl-7-oxo-5-(1′,2′,3′-trihydroxyprop-1′-yl, 1,4,5,7-tetrahydropyrano[3,4-b]pyrrole, 4R, 26, 1H NMR (400 MHz, CD3OD, δ, 0.94 [t, 3 H, Hδ(Bu, 3J, 7.3 Hz, 1.40 [m, 2 H, H γ(Bu, 1.50-1.67 [m, 2 H, Hβ(Bu, 2.85 [m, 2 H, Hα(Bu, 3.74 (dd, 1 H, H3′a, J 3′a-3′b, 11.5 Hz, J3′a-2′, 6.6 Hz, 3.83 (dd, 1 H, H3′b, J 3′b-3′a, 11.5 Hz, J3′b-2′, 4.0 Hz, 3.87 (s, 3 H, OMe, 4.00 (m, 1 H, H2′, 4.19 dd, 1 H, H1′, J1′-5, 7.9 Hz, J 1′-2′
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20+21.2 (c 1.65, MeOH).
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