Methyl (2S,3S,4S,9RS)-4-(1,3-Dioxolan-2-ylmethyl)-3,4-dihydro-3-<1-(methylsulfonyloxy)ethyl>-2-(2,3,4,6-tetraacetyl-β-D-glucopyranosyloxy)-2H-pyran-5-carboxylate 在
1,5-二氮杂双环[4.3.0]壬-5-烯 作用下,
以
吡啶 为溶剂,
反应 48.0h,
以40%的产率得到Methyl (2S,4S)-4-(1,3-Dioxolan-2-ylmethyl)-3-<(E)-ethylidene>-3,4-dihydro-2-(2,3,4,6-tetraacetyl-β-D-glucopyranosyloxy)-2H-pyran-5-carboxylate